onsemi-LA7784-TLM-E
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Ordering number : ENN8386
LA7784
Monolithic Linear IC
Downconverter IC
for Digital CATV
Overview
The LA7784 is a downconverter IC for digital CATV. It accepts RF input frequencies from 50 to 150MHz and supports
the DOCSIS (USA) and Euro-DOCSIS (Europe) standards.
Features
•
RF Mixer.
•
Attenuation control for RF Mixer.
•
Driver for SAW filter.
•
IF AGC amplifier.
•
IF Driver amplifier for ADC.
Specifications
Maximum Ratings
at Ta = 25
°
C
Parameter
Symbol
Conditions
Pin 8, 14, 19, 20, 21, 22, 26, 27
Pin 9
Ratings
Unit
V
max
Maximum supply voltage
Circuit voltages
6.0
V
V
CC
V max
V
CC
2
Circuit current
I
Pin 12, 13 sink current
Ta
≤
70
°
C
V
12, 13
Allowable power dissipation
Operating temperature range
Storage temperature range
* On the board (114.3
×
76.1
×
1.6mm)
P
d max
T
opr
900*
mA
mW
°
C
-20 to +70
T
stg
-55 to +150
Stresses exceeding Maximum Ratings may damage the device. Maximum Ratings are stress ratings only. Functional operation above the Recommended Operating
Conditions is not implied. Extended exposure to stresses above the Recommended Operating Conditions may affect device reliability.
Operating Conditions
at Ta = 25
°
C
Parameter
Symbol
Conditions
Ratings
Unit
V
V
Recommended supply voltage
Operating supply voltage range
Pin 8, 14, 19, 20, 21, 22, 26, 27
Pin 8, 14, 19, 20, 21, 22, 26, 27
5.0
4.5 to 5.5
CC
V
V
CC op
Semiconductor Components Industries, LLC, 2013
July, 2013
92706 / O2505 MS OT B8-6337 No.8386-1/7
LA7784
AC Characteristics
at Ta = 25
°
C, V
CC
= 3.3V
Ratings
typ
Parameter
Symbol
Pin No.
Conditions
No Signal
Unit
min
80
max
130
Circuit current
I
8, 14, 19, 20, 21, 22, 26, 27
105
mA
MHz
dB
total
RF input frequency range
RF AGC range
f
23, 24
26, 27
fc:-3dB
50
45
19
150
(RF)
GR1
CG1
V
9
= 2.5 to 0V
V
9
= 2.5V
53
22
Mixer conversion gain
26/23, 24
27/23, 24
26/23, 24
27/23, 24
4, 5
25
dB
Mixer inter modulation 1
IM3 1
Input = 75dB
μ
V
9
= 2.5V
fc:-3dB
40
50
dB
IF input frequency range
IF amplifier gain
f
30
51
100
59
MHz
dB
(IF)
G
12/4, 5
13/4, 5
12/4, 5
13/4, 5
12, 13
V
9
= 2.5V
55
50
(AGC)
IF inter modulation 2
IM3 2
Output = 110dB
μ
40
3
dB
Range
GR2
IF Output Level < ±1dB
Single output
5
1.0
1.0
dB
IF AGC output level
IF output level
V
o
1
2
12
13
V
p-p
V
p-p
(IF)
(IF)
V
o
Single output
Package Dimensions
unit: mm
3222A
No. 8386-2/7
LA7784
Pin Assignment
1
2
3
4
5
6
7
28
27
26
25
24
23
22
DRIVER GND
NC
DRIVER OUTPUT
DRIVER OUTPUT
RF ATT GND
NC
IF AGC AMP GND
IF AGC AMP INPUT
IF AGC AMP INPUT
RF ATT INPUT
RF ATT INPUT
NC
IF AGC AMP GND
RF ATT V
CC
GND
GND
8
21
20
19
18
17
16
15
IF AGC AMP V
CC
LNA V
CC
9
AGC CONTROL
NC
DRIVER V
CC
10
11
12
13
14
MIXER/LO V
NC
CC
IF DRIVER AMP GND
IF DRIVER AMP OUTPUT
IF DRIVER AMP OUTPUT
LO INPUT
LO INPUT
IF DRIVER AMP V
MIXER/LO GND
CC
Block Diagram
No. 8386-3/7
LA7784
Pin Description
(unit:
Ω
)
Pin Number
Description
Equivalent circuit
1
2
3
No Connection
No Connection
AGC Amp GND
AGC Amp Input
4
5
6
7
8
9
No Connection
AGC Amp GND
AGC Amp V
CC
AGC Control
10
11
No Connection
Post Amp GND
Continued on next page.
No. 8386-4/7
LA7784
Continued from preceding page.
(unit:
Ω
)
Pin Number
Description
Equivalent circuit
12
13
Post Amp Outputs
14
15
Post Amp V
CC
Mixer/LO GND
LO Input
16
17
18
19
20
No Connection
Mixer/LO V
CC
Driver V
CC
Continued on next page.
No. 8386-5/7
LA7784
Continued from preceding page.
(unit:
Ω
)
Pin Number
Description
Equivalent circuit
21
22
LNA V
CC
23
24
LNA Inputs
25
LNA GND
26
27
Driver Outputs
28
Driver Gnd
No. 8386-6/7
LA7784
Test Circuit
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o
f its products for any particular purpose, nor does SCILLC assume any liability arising out of the
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damages. “Typical” parameters which may be provided in SCILLC data sheets and/or specifications can and do vary in different applications and actual
performance may vary over time. All operating parameters, including “Typicals”
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PS No.8386-7/7
