Analog-Devices-Inc–Maxim-Integrated-MAX7401ESA-
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19-4788; Rev 1; 6/99
8 t h –
O
rd e r,
Lo w p a s s ,
Be s s e l,
S w it c h e d -Ca p a c it o r
Filt e rs
1/MAX7405
Ge n e ra l
De s c rip t io n
Fe a t u re s
T
h
e
M
AX
7
401/
M
AX
7
405 8th-order,
l
o
wpass, Besse
l
,
s
w
it
c
hed
–
c
apac
i
tor filt
e
r
s (SCFs) operate
f
rom a
s
i
n
g
l
e
+5V (
M
AX
7
401) or +3V (
M
AX
7
405) s
up p
l
y.
T
h
e s e
de
v
i
c
es d
r
a
w on
l
y
2
mA of supp
l
y
c
urrent and a
l
l
o
w cor-
ner
f
r
e
quenc
i
e
s
f
rom 1Hz to 5kHz, m
a
k
ing th
e
m
i
d
eal
f
o
r
l
o
w-
p
ower post-D
A
C filt
e
r
ing
a
nd ant
i
–
a
l
i
a
s
i
n
g app
l
i-
ca
t
ion
s
.
T
h
ey
f
e
a
t
ure a
s
hutdown mode that reduces
supp
l
y
c
urrent to 0.2µ
A
.
♦
8th-Order, Lowpass Bessel Filters
♦
Low Noise and Distortion:
-82dB THD + Noise
♦
Clock-Tunable Corner Frequency (1Hz to 5kHz)
♦
100:1 Clock-to-Corner Ratio
♦
Single-Supply Operation
+5V (MAX7401)
Two
c
l
o
ck
i
n
g opt
i
o
ns are ava
i
l
a
b
l
e
o
n these dev
i
c
es:
se
l
f-
c
l
o
ck
i
n
g (through the use of
an external capac
i
tor)
or external c
l
o
ck
i
n
g
f
o
r ti
g
hter corner-
f
r
e
quency contro
l
.
An
o
f
f
s
et ad
j
u
st p
i
n
a
l
l
o
ws for
a
d
j
u
stment of the DC out-
put
l
e
v
e
l
.
+3V (MAX7405)
♦
Low Power
2mA (Operating Mode)
0.2µA (Shutdown Mode)
T
h
e
M
AX
7
401/
M
AX
7
405 Bessel
f
ilt
e
r
s
p
r
ovi
d
e
l
o
w over-
shoot and
f
a
st se
t
tlin
g
.
T
h
e
i
r fix
e
d
r
e
sponse s
i
m
p
l
ifi
e
s
the des
i
g
n
t
a
sk
t
o
s
e
l
e
c
t
ing a
c
l
o
ck
f
r
e
quenc
y
.
♦
Available in 8-Pin SO/DIP Packages
♦
Low Output Offset:
±
5mV
Ord e rin g
In fo rm a t io n
Ap p lic a t io n s
PART
TEMP. RANGE
0°C to +70°C
0°C to +70°C
-40°C to +85°C
-40°C to +85°C
0°C to +70°C
0°C to +70°C
-40°C to +85°C
-40°C to +85°C
PIN-PACKAGE
8 SO
ADC A
n
ti-Ali
a
s
i
n
g
Post-D
A
C Filt
e
r
ing
Air-B
a
g
E
l
e
c
t
roni
c
s
C
T
2 B
a
se S
t
a
t
ions
Speech P
r
ocess
i
n
g
MAX7401
CSA
MAX
7
401CPA
MAX
7
401ESA
MAX
7
401EPA
MAX7405
CSA
MAX
7
405CPA
MAX
7
405ESA
MAX
7
405EPA
8 P
l
a
s
t
ic DIP
8 SO
8 P
l
a
s
t
ic DIP
8 SO
P in
Co n fig u ra t io n
8 P
l
a
s
t
ic DIP
8 SO
TOP VIEW
8 P
l
a
s
t
ic DIP
COM
IN
1
2
3
4
8
7
6
5
CLK
S
H
DN
OS
T
y
p ic a l
Op e ra t in g
Circ u it
MAX
7
401
MAX
7
405
GND
V
DD
OUT
V
S
U
P
P
L
Y
0.1
µ
F
SO/DIP
V
DD
S
H
DN
OUT
INPUT
IN
OUT
P
U
T
MAX
7
401
MAX
7
405
CLOCK
CLK
COM
OS
0.1
µ
F
GND
________________________________________________________________
Maxim Integrated Products
1
For small orders, phone 1-800-835-8769.
8 t h –
O
rd e r,
Lo w p a s s ,
Be s s e l,
S w it c h e d -Ca p a c it o r
Filt e rs
ABSOLUTE MAXIMUM RATINGS
V
DD
to GND
Cont
i
n
uous Power D
i
s
s
i
p
a
t
ion (T
=
+
70°C)
A
MAX
7
401 ……………………………………………………..-0.3V to
+6V
MAX
7
405 ……………………………………………………..-0.3V to
+4V
8-P
i
n
S
O (derate 5.88m
W
/°C
a
bo
v
e
+
70°C)…………….471mW
8-P
i
n DIP (
d
e
r
a
t
e 9.09m
W
/°C
a
bo
v
e
+
70°C)……………727mW
Ope
r
a
t
ing T
e
mpe
r
a
t
ure R
a
nges
IN, OUT, COM, OS, CLK ………………………-0.3V
to (V
+ 0.3
V
)
DD
SHDN
………………………………………………………………-0.3V to
+6V
OUT Short-Cir
c
u
i
t Dur
a
t
io
n
.
…………………………………………..1sec
MAX
7
40 _C_A …………………………………………….0°C to +70°C
MAX
7
40 _E_A ………………………………………….-40°C to +85°C
Storage
T
e
mpe
r
a
t
ure R
a
nge ………………………..-65°C to +150°C
L
e
ad
T
e
mpe
r
a
t
ure (
s
o
l
d
e
r
in
g
, 10sec)
………………………..+300°C
Str
e
sses be
y
ond those
l
i
s
t
e
d under
“
A
b
so
l
u
te M
a
x
imum R
a
t
in
g
s” may cause pe
r
manent damage to the dev
i
c
e.
T
h
ese a
r
e
s
t
r
e
ss
r
a
t
in
g
s on
l
y,
a
nd
f
u
nct
i
o
nal
ope
r
a
t
ion of the
d
e
v
i
c
e at
t
hese or any other cond
i
ti
o
ns beyond those
i
n
d
i
c
a
t
e
d
i
n the o
p
e
r
a
t
ion
a
l sec
t
ions of the spec
i
fi
c
a
t
ions is not im
p
l
i
e
d.
E
x
p
osure to
abso
l
u
te max
i
m
um rat
i
n
g cond
i
ti
o
ns
f
o
r extended per
i
o
ds may a
f
f
e
ct de
v
i
c
e
r
e
l
i
a
b
i
lity.
ELECTRICAL CHARACTERISTICS—MAX7401
(V
DD
= +
5
V
, filte
r
o
utp
ut me
a s ure d
a t
OU
T
,
1
0k
Ω
|| 50p
F
l
o
a
d to GND a
t OUT, OS = COM, 0.1µF from COM to GND,
SHDN
= V
, f
= 100kHz, T
= T
to T
, un
l
e
ss o
t
herwi
s
e noted.
T
y
p
i
c
al
v
a
l
u
es a
r
e
a
t T
= +25°C.)
MAX A
DD CLK
A
MIN
PARAMETER
FILTER CHARACTERISTICS
Corner Frequency
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
1/MAX7405
f
C
(Note 1)
0.001 to 5
100:1
10
kHz
C
l
o
ck-to-Corner Rat
i
o
C
l
o
ck-to-Corner
T
e
mpco
Output
V
o
l
t
a
ge
R
a
nge
Output O
f
f
s
et
V
o
l
t
a
ge
f /
f
C
C
L
K
ppm
/
°C
V
0.25
-0.1
V
DD
–
0.25
±25
V
V
IN
= V
= V
/ 2
±5
mV
OFFSET
COM
DD
DC In
s
e
r
tion G
a
i
n with
Output O
f
f
s
et
R
e
moved
V
COM
= V
/ 2 (Note 2)
0.15
0.3
dB
dB
DD
T
o
tal Harmon
i
c
Di
s
t
ortion
p
l
u
s No
i
s
e
f
= 200Hz, V
= 4
V
p
–
p
,
IN IN
THD
+
N
-82
1
measurement bandw
i
d
t
h = 22kHz
OS
V
o
l
t
a
ge Ga
i
n to OUT
I
n
put
V
o
l
t
a
ge
R
a
nge at OS
A
OS
V
/
V
V
V
OS
V
±0.1
COM
V
/ 2
– 0.5
V
+ 0.5
/ 2
DD
DD
I
n
put, COM externa
l
ly
d
r
iv
e
n
Output, COM
i
n
terna
l
ly
b
i
a
sed
V
/ 2
/ 2
DD
COM
V
o
l
t
a
ge
R
a
nge
V
COM
V
V
DD
/ 2
– 0.2
V
/ 2
DD
V
DD
+ 0.2
I
n
put Res
i
s
t
a
nce at COM
C
l
o
ck Feedthrough
R
75
125
10
1
k
Ω
m
V
p
–
p
k
Ω
COM
R
e
s
i
s
t
ive Out
p
ut
L
o
ad Dr
i
ve
R
C
10
50
L
L
M
a
x
imum Capac
i
tive Lo
a
d at
OUT
500
pF
I
n
put
L
e
a
k
a
ge Current at COM
I
n
put
L
e
a
k
a
ge Current at OS
CLOCK
±0.1
±0.1
±10
±10
µA
µA
SHDN
= GND, V
= 0 to V
DD
COM
V
= 0 to (V
– 1
V
)
(
Note 3)
DD
OS
I
n
ternal Osc
i
ll
a
t
or Fr
e
quency
C
l
o
ck
I
n
put Current
C
l
o
ck
I
n
put H
i
g
h
f
C
= 1000pF (Note 4)
= 0 or 5V
C
L
K
29
38
48
kHz
µA
V
OSC
OSC
I
V
±15
±30
C
L
K
V
V
– 0.5
IH
DD
C
l
o
ck
I
n
put
L
o
w
V
IL
0.5
V
2
_______________________________________________________________________________________
8 t h –
O
rd e r,
Lo w p a s s ,
Be s s e l,
S w it c h e d -Ca p a c it o r
Filt e rs
1/MAX7405
ELECTRICAL CHARACTERISTICS—MAX7401 (continued)
(V
DD
= +
5
V
, filte
r
o
utp
ut me
a s ure d
a t
OU
T
,
1
0k
Ω
|| 50p
F
l
o
a
d to GND a
t OUT, OS = COM, 0.1µF from COM to GND,
SHDN
= V
, f
= 100kHz, T
= T
to T
, un
l
e
ss o
t
herwi
s
e noted.
T
y
p
i
c
al
v
a
l
u
es a
r
e
a
t T
= +25°C.)
DD CLK
A
MIN
MAX
A
PARAMETER
POWER REQUIREMENTS
Supp
l
y V
o
l
t
a
ge
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
V
DD
4.5
5.5
3.5
1
V
Supp
l
y
C
urrent
I
DD
Ope
r
a
t
ing mode, no
l
o
ad,
I
N =
O
S = COM
2
mA
µA
dB
Shutdown Current
I
0.2
60
SHDN
= GND, CLK
d
r
iv
e
n
f
rom 0 to V
DD
SHDN
Power-Supp
l
y R
e
j
e
c
t
ion R
a
t
io
SHUTDOWN
PSRR
M
e
asu
r
e
d at
D
C
V
V
DD
– 0.5
V
V
SHDN
I
n
put H
i
g
h
SDH
V
SDL
0.5
SHDN
I
n
put
L
o
w
±0.1
±10
µA
SHDN
I
n
put
L
e
a
k
a
ge Current
V
= 0 to V
DD
SHDN
ELECTRICAL CHARACTERISTICS—MAX7405
(V
DD
= +
3
V
, filte
r
o
utp
ut me
a s ure d
a t
OU
T
,
1
0k
Ω
|| 50p
F
l
o
a
d to GND a
t OUT, OS = COM, 0.1µF from COM to GND,
SHDN
= V
, f
= 100kHz, T
= T
to T
, un
l
e
ss o
t
herwi
s
e noted.
T
y
p
i
c
al
v
a
l
u
es a
r
e
a
t T
= +25°C.)
MAX A
DD CLK
A
MIN
PARAMETER
FILTER CHARACTERISTICS
Corner Frequency
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
f
C
(Note 1)
0.001 to 5
100:1
10
kHz
C
l
o
ck-to-Corner Rat
i
o
C
l
o
ck-to-Corner
T
e
mpco
Output
V
o
l
t
a
ge
R
a
nge
Output O
f
f
s
et
V
o
l
t
a
ge
f
/
f
C
L
K C
ppm
/
°C
V
0.25
-0.1
V
–
0.25
±25
DD
V
V
IN
= V
= V
/ 2
±5
mV
OFFSET
COM
DD
DC In
s
e
r
tion G
a
i
n with
Output O
f
f
s
et
R
e
moved
V
COM
= V
/ 2 (Note 2)
0.03
0.3
dB
dB
DD
T
o
tal Harmon
i
c
Di
s
t
ortion
p
l
u
s No
i
s
e
f
= 200Hz, V
= 2.5
V
p
–
p
,
IN IN
THD
+
N
-84
1
measurement bandw
i
d
t
h = 22kHz
OS
V
o
l
t
a
ge Ga
i
n to OUT
I
n
put
V
o
l
t
a
ge
R
a
nge at OS
A
OS
V
/
V
V
V
OS
V
±0.1
COM
V
– 0.1
/ 2
V
+ 0.1
/ 2
DD
DD
COM
V
o
l
t
a
ge
R
a
nge
V
COM
i
n
terna
l
ly
b
i
a
sed or e
x
t
e
r
na
l
ly
d
r
iv
e
n
V
V
/ 2
COM
COM
DD
I
n
put Res
i
s
t
a
nce at COM
C
l
o
ck Feedthrough
R
75
125
10
1
k
Ω
m
V
p
–
p
k
Ω
R
e
s
i
s
t
a
nce Output
L
o
ad Dr
i
ve
R
C
10
50
L
L
M
a
x
imum Capac
i
tive
L
o
ad at OUT
500
pF
I
n
put
L
e
a
k
a
ge Current at COM
I
n
put
L
e
a
k
a
ge Current at OS
±0.1
±0.1
±10
±10
µA
µA
SHDN
= GND, V
= 0 to V
DD
COM
V
= 0 to (V
– 1
V
)
(
Note 3)
DD
OS
_______________________________________________________________________________________
3
8 t h –
O
rd e r,
Lo w p a s s ,
Be s s e l,
S w it c h e d -Ca p a c it o r
Filt e rs
ELECTRICAL CHARACTERISTICS—MAX7405 (continued)
(V
DD
= +
3
V
, filte
r
o
utp
ut me
a s ure d
a t
OU
T
,
1
0k
Ω
|| 50p
F
l
o
a
d to GND a
t OUT, OS = COM, 0.1µF from COM to GND,
SHDN
= V
, f
= 100kHz, T
= T
to T
, un
l
e
ss o
t
herwi
s
e noted.
T
y
p
i
c
al
v
a
l
u
es a
r
e
a
t T
= +25°C.)
MAX A
DD CLK
A
MIN
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
CLOCK
I
n
ternal Osc
i
ll
a
t
or Fr
e
quency
C
l
o
ck
I
n
put Current
C
l
o
ck
I
n
put H
i
g
h
f
C
= 1000pF (Note 4)
OSC
26
34
43
kHz
µA
V
OSC
I
V
C
L
K
= 0 or 3V
±15
±30
C
L
K
V
V
– 0.5
IH
DD
C
l
o
ck
I
n
put
L
o
w
V
IL
0.5
V
POWER REQUIREMENTS
Supp
l
y V
o
l
t
a
ge
V
2.7
3.6
3.5
1
V
DD
Supp
l
y
C
urrent
I
DD
Ope
r
a
t
ing mode, no
l
o
ad,
I
N =
O
S = COM
2
mA
µA
dB
Shutdown Current
I
0.2
60
SHDN
= GND, CLK
d
r
iv
e
n
f
rom 0 to V
SHDN
DD
Power-Supp
l
y R
e
j
e
c
t
ion R
a
t
io
SHUTDOWN
PSRR
M
e
asu
r
e
d at
D
C
1/MAX7405
V
V
DD
– 0.5
V
V
SHDN
I
n
put H
i
g
h
SDH
V
SDL
0.5
SHDN
I
n
put
L
o
w
V
= 0 to V
±0.1
±10
µA
SHDN
I
n
put
L
e
a
k
a
ge Current
SHDN
DD
FILTER CHARACTERISTICS—MAX7401/MAX7405
(V =
+
5V
f
o
r
M
AX
7
401, V
= +3V
f
o
r
M
AX
7
405;
f
ilt
e
r output measured at OU
T
;
1
0k
Ω
||
50pF
l
o
ad to GND at OU
T
;
SHDN
= V
;
DD
DD
DD
V
V
V
/2; f
= 100kHz; T
= T
to T
; un
l
e
ss
o
t
herwi
s
e noted.
T
y
p
i
c
al
v
a
l
u
es a
r
e
a
t T
= +25°C.)
MAX A
COM =
OS =
DD
C
L
K
A
MIN
PARAMETER
CONDITIONS
MIN
-1.0
-3.3
TYP
-0.8
-3.0
-33
MAX
-0.6
-2.7
-29
UNITS
f
= 0.5f
C
IN
f
IN
= f
C
I
n
se
r
tion G
a
i
n R
e
l
a
t
ive to
DC Ga
i
n
dB
f
IN
= 3f
C
f
IN
= 6f
-79
-74
C
Note 1:
T
h
e max
i
m
um f
i
s
d
e
f
i
n
ed as
t
he c
l
o
ck
f
r
e
quenc
y
, f
= 100
·
f
a
t
w
hi
c
h
t
he peak S
I
NAD
d
r
ops to 68dB w
i
th a
s
i
n
u-
C,
C
C
L
K
so
i
d
al
i
n
put at 0.2f
.
C
Note 2:
DC in
s
e
r
tion
g
a
i
n is
d
e
f
i
n
ed as
∆
V
/
∆
V .
IN
OUT
Note 3:
OS vo
l
t
a
ges abo
v
e V
– 1V saturate
the
i
n
put and resu
l
t in a
7
5µA ty
p
i
c
al
i
n
put
l
e
a
k
a
ge cu
r
r
e
nt.
DD
3
3
Note 4:
For MA
X
7
401, f
(kHz)
38
·
10 /
C
(
p
F
). For MA
X
7
405, f
(kHz) 34
·
10 /
C
(
p
F
).
OSC
OSC
OSC
OSC
4
_______________________________________________________________________________________
8 t h –
O
rd e r,
Lo w p a s s ,
Be s s e l,
S w it c h e d -Ca p a c it o r
Filt e rs
1/MAX7405
T
y
p ic a l
Op e ra t in g
Ch a ra c t e ris t ic s
(V =
+
5V
f
o
r
M
AX
7
401, V
= +3V
f
o
r
M
AX
7
405; f
= 100kHz;
SHDN
= V
; V
= V
= V
/ 2; T
= +25°C; un
l
e
ss o
t
herwi
s
e
C
L
K
DD
DD
DD COM
OS DD
A
noted.)
FREQUENCY RES
P
O
N
S
E
P
A
S
SB
A
ND
F
REQUENCY RES
P
O
N
S
E
P
H
A
S
E RESP
O
N
S
E
10
0
0.5
0
0
-50
f =
1kHz
C
f =
1kHz
C
f =
1kHz
C
-10
-20
-30
-40
-50
-60
-70
-0.5
-1.0
-1.5
-2.0
-2.5
-3.0
-3.5
-100
-150
-200
-250
-300
-350
-400
0
1
2
3
4
5
0
202
404
606
808
1010
0
400
800
1200
1600
2000
INPUT FREQUENCY (kHz)
INPUT FREQUENCY (Hz)
INPUT FREQUENCY (Hz)
O
F
FSET
V
OLTAGE
v
s
.
S
U
P
P
L
Y
VOLTAGE
S
U
P
P
L
Y CURRENT
v
s
.
T
EM
P
E
RATURE
S
U
P
P
L
Y CURRENT
v
s
.
S
U
P
P
L
Y
VOLTAGE
2.5
2.4
2.3
2.2
2.1
2.0
1.9
1.8
1.7
1.6
1.5
20
15
10
5
2.03
2.02
2.01
2.00
1.99
1.98
1.97
NO LOAD
V
= V
= V
/ 2
IN COM DD
NO LOAD
MAX
7
401
MAX
7
401
MAX
7
405
MAX
7
401
MAX
7
405
0
-5
-10
-15
-20
MAX
7
405
2.5
3.0
3.5
4.0
4.5
5.0
5.5
2.5
3.0
3.5
4.0
4.5
5.0
5.5
-40 -20
0
20
40
60
80 100
S
U
P
P
L
Y VOLTAGE
(
V
)
S
U
P
P
L
Y VOLTAGE
(
V
)
TEM
P
E
RATURE
(
°C)
I
N
TERNAL OSCILLATOR FREQUENCY
v
s
. C
C
A
P
A
CITANCE
NORMAL
I
Z
ED O
S
CI
L
LATOR
F
REQUENCY
v
s
.
S
U
P
P
L
Y
VOLTAGE
O
F
FSET
V
OLTAGE
v
s
.
T
EM
P
E
RATURE
O
S
C
1.0
0.5
0
10,000
1.20
1.15
1.10
1.05
1.00
0.95
0.90
0.85
0.80
C
O
S
C
= 390pF
V
= V
= V
/ 2
IN COM DD
1000
100
10
MAX
7
405
-0.5
-1.0
-1.5
MAX
7
401
1
0.1
-40 -20
0
20
40
60
80 100
0.01
0.1
1
10
100
1000
2.5
3.0
3.5
4.0
4.5
5.0
5.5
TEM
P
E
RATURE
(
°C)
C
O
S
C
C
A
P
A
C
IT
A
NCE
(
nF)
S
U
P
P
L
Y VOLTAGE
(
V
)
_______________________________________________________________________________________
5
8 t h –
O
rd e r,
Lo w p a s s ,
Be s s e l,
S w it c h e d -Ca p a c it o r
Filt e rs
T
y
p ic a l
Op e ra t in g
Ch a ra c t e ris t ic s
(c o n t in u e d )
(V =
+
5V
f
o
r
M
AX
7
401, V
= +3V
f
o
r
M
AX
7
405; f
= 100kHz;
SHDN
= V
; V
= V
= V
/ 2; T
= +25°C; un
l
e
ss o
t
herwi
s
e
C
L
K
DD
DD
DD COM
OS DD
A
noted.)
MAX
7
401
MAX
7
401
NORMAL
I
Z
ED O
S
CI
L
LATOR
F
REQUENCY
v
s
.
T
EM
P
E
RATURE
THD
P
L
US NO
I
SE v
s
.
I
N
P
U
T
S
I
G
NAL AM
P
L
I
TUDE
THD
P
L
US NO
I
SE v
s
.
I
N
P
U
T
S
I
G
NAL
AM
P
L
I
TUDE AND RESISTIVE LOAD
1.04
1.03
1.02
1.01
1.00
0.99
0.98
0.97
0.96
0
0
-10
-20
-30
-40
-50
-60
-70
-80
-90
f
= 200
H
z
IN
C
O
S
C
= 390pF
NO LOAD
(S
E
E TABLE A)
-10
f =
1kHz
C
MEA
S
U
REMENT BW =
2
2k
H
z
-20
-30
-40
-50
-60
-70
-80
-90
MAX
7
401
R =
500
Ω
L
MAX
7
405
R =
1k
Ω
L
A
B
R =
10k
Ω
L
1/MAX7405
0
1
2
3
4
5
-40 -20
0
20
40
60
80 100
0
1
2
3
4
5
AM
P
L
ITUDE
(
V
p
-p)
TEM
P
E
RATURE
(
°C)
AM
P
L
ITUDE
(
V
p
-p)
MAX
7
405
THD
P
L
US NO
I
SE v
s
.
I
N
P
U
T
S
I
G
NAL
AM
P
L
I
TUDE AND RESISTIVE LOAD
MAX
7
405
THD
P
L
US NO
I
SE v
s
.
I
N
P
U
T
S
I
G
NAL AM
P
L
I
TUDE
0
-10
-20
-30
-40
-50
-60
-70
-80
-90
0
-10
-20
-30
-40
-50
-60
-70
-80
f
= 200
H
z
NO LOAD
(S
E
E TABLE A)
IN
f =
1kHz
C
MEA
S
U
REMENT BW =
2
2k
H
z
R =
500
Ω
L
R =
1k
Ω
L
A
B
R =
10k
Ω
L
-90
0
0
0.5
1.0
1.5
2.0
2.5
3.0
0.5
1.0
1.5
2.0
2.5
3.0
AM
P
L
ITUDE
(
V
p
-p)
AM
P
L
ITUDE
(
V
p
-p)
Table A.
THD Plus Noise vs. Input
Signal Amplitude Test Conditions
f
f
f
CLK
(kHz)
MEASUREMENT
BANDWIDTH (kHz)
IN
C
TRACE
(Hz)
(kHz)
A
B
1000
200
5
1
500
100
80
22
6
_______________________________________________________________________________________
8 t h –
O
rd e r,
Lo w p a s s ,
Be s s e l,
S w it c h e d -Ca p a c it o r
Filt e rs
1/MAX7405
P in
De s c rip t io n
PIN
NAME
FUNCTION
Common
I
n
put. B
i
a
sed
i
n
terna
l
ly
a
t m
i
d
–
s
upp
l
y. By
p
ass e
x
t
e
r
na
l
ly to
G
ND with a 0.1µF
c
apac
i
tor. To ov
e
r
–
ri
d
e
i
n
ternal
b
i
a
s
i
n
g, d
r
ive with
a
n e
x
t
e
r
nal supp
l
y.
1
COM
2
3
4
5
IN
Filt
e
r
I
n
put
GND
Ground
V
DD
Pos
i
tive Su
p
p
l
y I
n
put: +5V
f
o
r
M
AX
7
401, +3V
f
o
r
M
AX
7
405
Filt
e
r Output
OUT
OS
O
f
f
s
et
A
d
j
u
st
I
n
put.
T
o
a
d
j
u
st output o
f
f
s
e
t
,
b
i
a
s OS e
x
t
e
r
na
l
ly.
C
onnect OS to COM
i
f
n
o o
f
f
s
et ad
j
u
stment
i
s
needed.
R
e
f
e
r
t
o
O
f
f
s
et and Common-
M
o
de
I
n
put
A
d
j
u
stment
s
ec
t
ion.
6
7
8
Shutdown
I
n
put. Dr
i
ve l
o
w to enab
l
e
s
hutdown mode; dr
i
ve hi
g
h or connect to V
f
o
r normal operat
i
o
n.
DD
SHDN
C
L
K
C
l
o
ck
I
n
put.
T
o
o
verri
d
e
t
he int
e
r
nal osc
i
ll
a
t
or,
c
onnect to an external c
l
o
ck; otherw
i
s
e, connect an e
x
t
e
r
nal
capac
i
tor (C
) from CLK to GND to
s
et
t
he int
e
r
nal osc
i
ll
a
t
or fr
e
quenc
y
.
OSC
_______________De t a ile d
De s c
r
ip t io n
T
h
e
M
AX
7
401/
M
AX
7
405 Bessel
f
ilt
e
r
s
p
r
ovi
d
e
l
o
w over-
shoot and
f
a
st se
t
tling r
e
sponses.
B
oth
p
a
r
ts o
p
e
r
a
t
e
with a 100:1
c
l
o
ck-to-corner
f
r
e
quency
r
a
t
io
a
nd a 5kHz
max
i
m
um corner
f
r
e
quenc
y
.
A
2
V
/
div
L
o
wpass Bessel
f
ilt
e
r
s
s
uch as
t
he MA
X
7
401/
M
AX
7
405
de
l
a
y a
l
l fr
e
quency components equa
l
ly,
p
r
e
se
r
ving the
shape of
s
t
e
p
i
n
puts (sub
j
e
ct
t
o the
a
t
t
e
nuat
i
o
n of the
h
i
g
her
f
r
e
quenc
i
e
s
)
. B
e
ssel
f
ilt
e
r
s
s
e
t
tle
q
u
i
c
k
ly—
a
n
i
m
portant character
i
s
t
ic in
a
pp
l
i
c
a
t
ions th
a
t use a mu
l
ti-
p
l
e
x
e
r
(
mux) to se
l
e
ct an
i
n
put s
i
g
nal
f
o
r an ana
l
o
g-to-
d
i
g
i
t
a
l converter (
A
DC). An
a
nt
i
–
a
l
i
a
s
i
n
g
f
ilt
e
r p
l
a
ced
be
t
w
e
en
t
he mux and the
A
DC mu
s
t se
t
tle
q
u
i
c
k
ly
a
f
t
e
r
a new channel
i
s
s
e
l
e
c
t
e
d.
B
C
2
V
/
div
2
V
/
div
200
µ
s/div
Fi
g
ure 1 shows the d
i
ff
e
r
e
nce be
t
w
e
en
B
e
ssel and
Butt
e
r
worth filt
e
r
s wh
e
n a 1kHz square wave
i
s
a
pp
l
i
e
d
to the filt
e
r
i
n
put.
W
ith the filt
e
r cu
t
off fr
e
quenc
i
e
s set at
5kHz, tr
a
ce B shows the Bessel
f
ilt
e
r
r
e
sponse and
tr
a
ce C shows the Butterworth
f
ilt
e
r
r
e
sponse.
A:
1
kHz INPUT SIGN
A
L
B: BE
S
S
E
L FILTER RE
S
P
O
N
S
E
; f
=
5
kHz
C
C: BUTTERWORTH FILTER RE
S
P
O
N
S
E
; f
=
5
kHz
C
Fi
g
ure 1.
Bessel vs. Butterworth F
i
lt
e
r
R
e
sponse
Ba c k g ro u n d
In fo rm a t io n
M
o
st s
w
it
c
hed
–
c
apac
i
tor filt
e
r
s (SCFs) are des
i
g
ned
w
ith
b
i
q
uad
r
a
t
ic
s
ec
t
ion
s
.
E
a
ch sec
t
ion im
p
l
e
ments two
f
ilt
e
r
–
i
n
g po
l
e
s, and
t
he sect
i
o
ns are cascaded
t
o
p
r
oduce
h
i
g
her order
f
ilt
e
r
s
.
T
h
e ad
v
a
ntage to th
i
s
a
pp
r
oach
i
s
ease of
des
i
g
n. However, th
i
s ty
p
e of des
i
g
n
i
s
h
i
g
h
l
y
sens
i
tive to
c
omponent var
i
a
t
ions if
a
ny sec
t
ion
’
s Q is
h
i
g
h.
A
n
a
l
t
e
r
nat
i
ve
a
pp
r
oach
i
s to
e
mu
l
a
t
e a
p
ass
i
ve n
e
t
–
work us
i
n
g sw
i
t
c
hed
–
c
apac
i
tor int
e
g
r
a
t
ors with
s
umm
i
n
g
and sca
l
i
n
g. F
i
g
ure 2 shows a bas
i
c
8
th-order
l
a
dder
f
ilt
e
r
s
t
ru
c
t
ur
e
.
R1
L5
L7
L1
L3
+
–
V
0
V
IN
C6
R2
C2
C4
C8
Fi
g
ure 2.
8th-Order
L
a
dder
F
ilt
e
r
N
e
t
work
_______________________________________________________________________________________
7
8 t h –
O
rd e r,
Lo w p a s s ,
Be s s e l,
S w it c h e d -Ca p a c it o r
Filt e rs
A s
witc he d -c a p a c itor
filte r
s uc h
a s
the MA
X
7
401/
Lo w -P o w e r
S h u t d o w n
Mo d e
T
h
ese de
v
i
c
es
f
e
a
t
ure a
s
hutdown mode that
i
s
a
c
t
iv
a
t
–
ed by d
r
iving
SHDN
l
o
w. In
s
hutdown mode, the
f
ilt
e
r
’
s
supp
l
y
c
urrent reduces to 0.2µA (typ) and
i
ts out
p
ut
becomes h
i
g
h
i
m
pedance.
F
or normal operat
i
o
n, dr
i
ve
MAX
7
405 emu
l
a
t
e
s a pass
i
ve l
a
dder
f
ilt
e
r
. The filt
e
r
’
s
component sens
i
tivity is low wh
e
n compa
r
e
d
t
o a
c
as-
caded b
i
q
uad des
i
g
n because each component a
f
f
e
c
t
s
the ent
i
re filt
e
r shape, not
j
u
st one po
l
e
–
zero pa
i
r. In
o
ther
wor
d
s, a m
i
s
ma
t
c
hed component
i
n a
b
i
q
uad des
i
g
n
w
ill
have a concentrated error on
i
ts r
e
spec
t
ive
p
o
l
e
s,
w
hile
the same m
i
s
ma
t
c
h
i
n a l
a
dder
f
ilt
e
r des
i
g
n
r
e
su
l
ts in
a
n
e
r
ror
d
i
s
t
ri
b
uted over a
l
l
p
o
l
e
s.
SHDN
h
i
g
h or connect to V
.
DD
___________Ap p lic a t io n s
In fo
r
m a t io n
Offs e t
a n d
Co m m o n -Mo d e
In p u t
Ad ju s t m e n t
Clo c k
S ig n a l
T
h
e vo
l
t
a
ge at COM se
t
s the
c
ommon-mode
i
n
put vo
l
t-
age and
i
s
b
i
a
sed at m
i
d
–
s
upp
l
y with
a
n
i
n
ternal res
i
s
t
or-
d ivid e r.
Byp a s s
COM with a 0.1µF c
a p a c itor
a nd
connect OS to CO
M
. For
a
pp
l
i
c
a
t
ions r
e
qu
i
ri
n
g o
f
f
s
et
ad
j
u
stment or DC
l
e
v
e
l sh
i
fti
n
g, app
l
y
a
n e
x
t
e
r
nal b
i
a
s
volt
a
ge
t
hrough a res
i
s
t
or-
d
i
vi
d
er ne
t
work to OS, as
shown
i
n Fi
g
ure 3. (Note: Do not
l
e
a
v
e OS unconnect-
ed.)
T
h
e output vo
l
t
a
ge
i
s r
e
p
r
e
sen
t
e
d by
t
his
e
qua
t
ion:
External Clock
T
h
e
M
AX
7
401/
M
AX
7
405
f
a
m
i
ly
o
f SCFs
i
s
d
es
i
g
ned
f
o
r
use w
i
th
e
x
t
e
r
nal c
l
o
cks that have a 40% to 60% duty
c
y
c
l
e
.
W
h
en us
i
n
g an e
x
t
e
r
nal c
l
o
ck w
i
th th
e
se de
v
i
c
es,
d
r
ive CLK
with a CMOS
g
a
t
e
p
owered
f
rom 0 to V
.
DD
V
a
r
ying the r
a
t
e of
the external
c
l
o
ck ad
j
u
sts the corner
fr
e
quency of the
f
ilt
e
r as
f
o
l
l
o
ws:
1/MAX7405
f =
f
/ 100
C
C
L
K
V
= (V
– V
) + V
OUT
IN
COM OS
Internal Clock
W
h
en us
i
n
g the
i
n
ternal osc
i
ll
a
t
or,
c
onnect a capac
i
tor
(C )
b
e
t
w
e
en C
L
K
a
nd g
r
ound.
T
h
e va
l
u
e of the
with V
= V
/ 2 (ty
p
i
c
a
l
),
a
nd where (V
– V
) is
COM
DD
IN
COM
OSC
l
o
wpass
f
ilt
e
r
e
d by
t
he SCF, and V
is
a
dded at
t
he
OS
capac
i
tor
d
e
t
e
r
min
e
s
t
he osc
i
ll
a
t
or fr
e
quency as
f
o
l
l
o
ws:
output stage. See the
El
e
c
t
ri
c
al Character
i
s
t
i
c
s
f
o
r the
volt
a
ge
r
a
nge of
COM and
OS. Chang
i
n
g the volt
a
ge on
COM or OS s
i
g
n
i
fi
c
an
t
ly from mi
d
–
s
upp
l
y r
e
duces
t
he fil-
t
e
r
’
s
d
y
nam
i
c r
a
nge.
3
K 10
f
(kHz)
=
; C
in
p
F
OSC
OSC
C
OSC
P o w e r
S u p p lie s
T
h
e
M
AX
7
401 operates
f
rom a
s
i
n
g
l
e
+
5V
supp
l
y,
a
nd
the MA
X
7
405 op
e ra te s
f
rom a s
ing le
+ 3V
s up p ly.
where K
= 38
f
o
r
M
AX
7
401 and K = 34
f
o
r
M
AX
7
405.
Mi
n
i
m
i
z
e the stray capac
i
t
a
nce at C
L
K
s
o
t
hat
i
t
d
oes
not a
f
f
e
ct
t
he int
e
r
nal osc
i
ll
a
t
or fr
e
quenc
y
.
V
a
r
y the r
a
t
e
of the
i
n
ternal osc
i
ll
a
t
or to
a
d
j
u
st the
f
ilt
e
r
’
s
c
orner
f
r
e
–
quency by a 100:1 c
l
o
ck-to-corner
f
r
e
quency
r
a
t
io. For
e
x
a
mp
l
e
, an
i
n
ternal osc
i
ll
a
t
or fr
e
quency of 100kHz
p
r
oduces a nom
i
n
al
corner
f
r
e
quency of 1kHz.
By
p
ass V
t
o GND with a 0.1µF
c
apac
i
tor. If
d
ual sup-
DD
p lie s
a re
re q uire d
(± 2.5V
for MA
X
7
401, ±
1.5V
f
o
r
MAX
7
405), connect COM to system ground and connect
V
S
U
P
P
L
Y
In p u t
Im p e d a n c e
vs .
Clo c k
Fre q u e n c ie s
T
h
e
M
AX
7
401/
M
AX
7
405
’
s i
n
put
i
m
pedance
i
s
e
f
f
e
c
t
iv
e
l
y
that of a sw
i
t
c
hed
–
c
apac
i
tor r
e
s
i
s
t
or and
i
s i
n
verse
l
y
p
r
o-
port
i
o
nal to
f
r
e
quenc
y
. The in
p
ut
i
m
pedance
v
a
l
u
es
de
t
e
r
min
e
d be
l
o
w represent the average
i
n
put
i
m
ped-
ance s
i
n
ce the
i
n
put current
i
s
n
ot cont
i
n
uous.
A
s a rul
e
,
use a d
r
iv
e
r
w
ith
a
n output
i
m
pedance
l
e
ss
t
han 10% of
the filt
e
r
’
s i
n
put
i
m
pedance.
E
s
t
im
a
t
e the in
p
ut
i
m
ped-
ance of
the
f
ilt
e
r us
i
n
g the
f
o
l
l
o
wing formul
a
:
0.1
µ
F
V
DD
S
H
DN
OUT
OUT
P
U
T
INPUT
IN
COM
0.1
µ
F
0.1
µ
F
50k
MAX
7
401
MAX
7
405
50k
50k
CLOCK
CLK
OS
1
Z
=
IN
f
C
IN
(
)
C
L
K
GND
where f
=
c
l
o
ck
f
r
e
quency and C
= 3.37pF.
IN
C
L
K
Fi
g
ure 3.
O
f
f
s
et
A
d
j
u
stment C
i
r
c
u
i
t
8
_______________________________________________________________________________________
8 t h –
O
rd e r,
Lo w p a s s ,
Be s s e l,
S w it c h e d -Ca p a c it o r
Filt e rs
1/MAX7405
Table 1. Typical Harmonic Distortion
TYPICAL HARMONIC DISTORTION (dB)
f
f
f
V
IN
(Vp-p)
CLK
C
IN
FILTER
MAX
7
401
MAX
7
405
(kHz)
(kHz)
(Hz)
2nd
-91
-89
-87
-83
3rd
-83
-79
-83
-82
4th
-90
-92
-87
-88
5th
-93
-92
-88
-88
100
500
100
500
1
5
1
5
200
1000
200
4
2
1000
An t i-Alia s in g
a n d
P o s t -DAC
Filt e rin g
V+
W
h
en us
i
n
g the
M
AX
7
401/
M
AX
7
405
f
o
r ant
i
–
a
l
i
a
s
i
n
g or
pos
t
-DAC filt
e
r
in
g
, s
y
nchron
i
z
e the DAC
a
nd the
f
ilt
e
r
c
l
o
cks.
I
f the
c
l
o
cks are not synchron
i
z
ed, beat
f
r
e
quen-
c
i
e
s may a
l
i
a
s
i
n
to the passband.
*
V
DD
S
H
DN
T
h
e h
i
g
h c
l
o
ck-to-corner
f
r
e
quency
r
a
t
io (100:1)
a
l
s
o
eases
t
he r
e
qu
i
r
e
ments of
pre- and post-SCF
f
ilt
e
r
in
g
.
A
t
the in
p
ut, a
l
o
wpass
f
ilt
e
r p
r
e
v
e
nts the a
l
i
a
s
i
n
g of
f
r
e
–
quenc
i
e
s a
r
ound the c
l
o
ck
f
r
e
quency
i
n
to the passband.
At the out
p
ut, a
l
o
wpass
f
ilt
e
r a
t
t
e
nuates the c
l
o
ck
f
e
ed
t
hrough.
OUT
OUT
P
U
T
INPUT
IN
COM
MAX
7
401
MAX
7
405
V+
V-
CLOCK
CLK
OS
0.1
µ
F
0.1
µ
F
A h
i
g
h c
l
o
ck-to-corner
f
r
e
quency
r
a
t
io
a
l
l
o
ws a s
i
m
p
l
e
RC low
p
ass
f
ilt
e
r
, with the
c
uto
f
f fr
e
quency set abo
v
e
the SCF corner
f
r
e
quenc
y
, to
p
r
ovi
d
e
i
n
put ant
i
–
a
l
i
a
s
i
n
g
and reasonab
l
e
o
utput c
l
o
ck a
t
t
e
nuat
i
o
n.
GND
V-
Ha rm o n ic
Dis t o rt io n
H
a
r
mon
i
c
d
i
s
t
ortion
a
r
i
s
es
f
rom nonlin
e
a
r
iti
e
s
w
ithin the
filt
e
r
. Th
e
se non
l
i
n
ea
r
iti
e
s gene
r
a
t
e harmon
i
c
s
w
hen a
pure s
i
n
e wave
i
s
a
pp
l
i
e
d
t
o the filt
e
r
i
n
put.
T
a
b
l
e 1 li
s
t
s
the MA
X
7
401/
M
AX
7
405
’
s
t
y
p
i
c
al
ha
r
mon
i
c
–
d
i
s
t
ortion
v
a
l
u
es w
i
th a
1
0k
Ω
l
o
ad at
T
A
=
+
25°C.
*DRIVE
S
H
DN TO V-
FOR LOW
–
P
O
WER
S
H
UTDOWN MODE.
Fi
g
ure 4.
Dua
l
-Su
p
p
l
y
O
pe
r
a
t
ion
GND to the negat
i
ve
s
upp
l
y. Fi
g
ure 4 shows an examp
l
e
of dua
l
–
s
upp
l
y
o
pe
r
a
t
ion. Sin
g
l
e
– and dua
l
–
s
upp
l
y
p
e
r
for-
mance are equ
i
v
a
l
e
nt. For e
i
th
e
r s
i
n
g
l
e
– or dua
l
–
s
upp
l
y
ope
r
a
t
ion,
d
r
ive CLK
a
nd
SHDN
from GND (
V
– in
d
ua
l
–
supp
l
y
o
pe
r
a
t
ion) to V
. For
±
5V dua
l
–
s
upp
l
y
a
pp
l
i
c
a-
tion
s
, use
t
he MA
X
2
91–
M
AX
2
97.
DD
Ch ip
In fo rm a t io n
In p u t
S ig n a l
Am p lit u d e
Ra n g e
T
h
e opt
i
m
al
i
n
put s
i
g
nal
r
a
nge
i
s
d
e
t
e
r
min
e
d by obse
r
v-
i
n
g the volt
a
ge
l
e
v
e
l
at
w
hi
c
h
t
he total harmon
i
c
d
i
s
t
or-
tion
p
l
u
s no
i
s
e
(
THD
+
N
) is minimiz
e
d
f
o
r a g
i
v
e
n co
r
ner
fr
e
quenc
y
. The
Ty
p
i
c
al Ope
r
a
t
ing
Character
i
s
t
i
c
s
s
how
g
r
a
phs of
the dev
i
c
es’
T
HD
+
N
r
e
sponse as
t
he in
p
ut
s
i
g
na
l
’s
p
ea
k
-to-
p
eak amp
l
it
u
de
i
s v
a
r
i
e
d.
T
h
ese mea-
surements are made w
i
th OS
a
nd COM b
i
a
sed at m
i
d
–
supp
l
y.
TRANSISTOR COUNT: 1116
_______________________________________________________________________________________
9
8 t h –
O
rd e r,
Lo w p a s s ,
Be s s e l,
S w it c h e d -Ca p a c it o r
Filt e rs
________________________________________________________P a c k a g e
In fo
r
m a t io n
1/MAX7405
10 ______________________________________________________________________________________
8 t h –
O
rd e r,
Lo w p a s s ,
Be s s e l,
S w it c h e d -Ca p a c it o r
Filt e rs
1/MAX7405
P a c k a g e
In fo rm a t io n
(c o n t in u e d )
______________________________________________________________________________________ 11
8 t h –
O
rd e r,
Lo w p a s s ,
Be s s e l,
S w it c h e d -Ca p a c it o r
Filt e rs
NOTES
1/MAX7405
M
a
x
im
c
annot assume respons
i
b
i
lity f
o
r use of any c
i
r
c
u
i
try oth
e
r
t
han c
i
r
c
u
i
try
e
nt
i
r
e
l
y
e
mbod
i
e
d
i
n a M
a
x
im
p
r
oduct. No c
i
r
c
u
i
t
p
a
t
e
nt
l
i
c
enses a
r
e
i
m
p
l
i
e
d.
M
a
x
im r
e
se
r
v
e
s
t
he ri
g
ht to change the c
i
r
c
u
i
try
a
nd spec
i
fi
c
a
t
ions without noti
c
e at any
t
im
e
.
12
____________________Ma x im
In t e g
r
a t e d
P ro d u c t s ,
1 2 0
S a n
Ga b rie l
Drive ,
S u n n yva le ,
CA 9
4 0 8 6
4 0 8
–
7 3 7 -7 6 0 0
© 1999
M
a
x
im I
n
tegrated Products
Print
e
d
U
SA
is a r
e
g
i
s
t
e
r
e
d
t
r
a
dema
r
k of M
a
x
im I
n
tegrated Products.
