Analog-Devices-Inc–Maxim-Integrated-MAX2092ETP-T
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MAX2092
700MHz to 2700MHz Analog VGA with Threshold
Alarm Circuit and Error Amplifier for Level Control
General Description
Benefits and Features
●
Wide Band Analog VGA Increases System
The MAX2092 high-linearity analog variable-gain amplifier
(VGA) is a monolithic SiGe BiCMOS attenuator/
amplifier/
error amplifier with an alarm circuit designed to interface
with 50
I
systems operating in the 700MHz to 2700MHz
frequency range. The device features a gain range of
+18.1dB to -22.3dB, a noise figure of 5.2dB, OIP3 linear-
ity of +32.5dBm, and a wide RF bandwidth. Each of these
features makes the device an ideal VGA for numerous
receiver and transmitter applications. When paired with
the MAX2091 or MAX2091B variable gain upconverter, a
complete 2-chip IF-RF signal conditioning solution is pos-
sible for microwave point-to-point transmitters.
Performance
• 700MHz
to 2700MHz RF Frequency Range
• High
Linearity
• +32.5dBm
OIP3
• +18.2dBm
Output -1dB Compression Point
• 18.1dB
Gain with 40.4dB Attenuation Range and
0.03dB Gain Variation Over 100MHz Bandwidth at
1835MHz
• 5.2dB
Noise Figure (Includes Attenuator Insertion
Loss)
●
Integrated Error Amplifier and Alarm Circuit Simplifies
ALC Operation
The MAX2092 operates from a single +5V supply, and
is available in a compact 20-pin TQFN package (5mm
x 5mm) with an exposed pad. Electrical performance is
guaranteed over the extended temperature range from
●
Lowers Power Consumption with Power-Down
Capability
●
Package with Exposed Pad Improves Heat
T
= -40
N
C to +95
N
C.
C
Dissipation and System Performance
Applications
●
Microwave Point-to-Point Receivers and Transmitters
●
RF Variable-Gain Stages
●
T
e
mperature Compensation Circuits
●
Cellular Applications
Ordering Information
appears at end of data sheet.
●
WiMAX® Applications
●
LTE Applications
●
Fixed Broadband Wireless Access
●
Wireless Local Loop
WiMAX is a registered certification mark and registered service
mark of WiMAX Forum.
19-6377; Rev 1; 7/15
MAX2092
700MHz to 2700MHz Analog VGA with Threshold
Alarm Circuit and Error Amplifier for Level Control
Absolute Maximum Ratings
V
, V
………………………………………………..-0.3V to +6V
Operating Case Temperature
CC_RF CC_A
RF_OUT, RF_I
N
.
………………………………… -0.3V to (V
R_BIAS, CTRL1, CTRL2,
+ 0.3V)
Range (Note 2
)
.
………………………………………. -40
N
C to +95
N
C
Maximum Junction Temperature……………………………….+150
N
C
Storage Temperature Range………………………. -65
N
C to +150
N
C
Lead Temperature (soldering, 10s) …………………………..+300
N
C
Soldering Temperature (reflow) ………………………………
+260
N
C
CC
PLVLSET, DET_VIN … -0.3V to Minimum (V
+ 0.3V, +3.6V)
CC
RF_IN Input Power ……………………………………………….
.
+
15dBm
RF_OUT Output Power………………………………………….
.
+
23dBm
Continuous Power Dissipation (Note 1) ………………………..2.5W
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation
of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum
rating conditions for extended periods may affect device reliability.
Note 1:
Based on junction temperature T
= T
+ (
B
x V
x I
). This formula can be used when the temperature of the
CC
J
C
JC
CC
exposed pad is known while the device is soldered down to a PCB. See the
Applications Information
section for details.
The junction temperature must not exceed +150
N
C.
Note 2:
T is
the temperature on the exposed pad of the package. T
is the ambient temperature of the device and PCB.
C
A
Package Thermal Characteristics
Junction-to-Ambient Thermal Resistance (
q
)
Junction-to-Case Thermal Resistance (
q
)
JA
JC
(Notes 3, 4)……………………………………………………….. 32°C/W
(Notes 1, 4)…………………………………………………………. 7°C/W
Note 3:
Junction temperature T
= T
+ (
q
x V
x I
). This formula can be used when the ambient temperature of the PCB is
J
A
JA
CC
CC
known. The junction temperature must not exceed +150
N
C.
Note 4:
Package thermal resistances were obtained using the method described in JEDEC specification JESD51-7, using a four-layer
board. For detailed information on package thermal considerations, refer to
www.maximintegrated.com/thermal-tutorial
.
DC Electrical Characteristics
(
Typical Application Circuit
with V
= 4.75V to 5.8V, V
= 0V, and T
= -40°C to +95°C. Typical values are at V
= 5.5V and
CC
CC
GND
C
T
= +25°C, unless otherwise noted.) (Note 5)
C
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
5.8
3
UNITS
Supply Voltage
V
4.75
V
CC
Power down: CTRL1 = 0, CTRL2 = 0
VGA-only mode: CTRL1 = 1, CTRL2 = 0
ALC mode: CTRL1 = 1, CTRL2 = 1
2
Total Supply Current
I
80
93
90
mA
V
DC
110
CTRL1/CTRL2 Logic-Low Input
Voltage
V
0.8
IL
CTRL1, CTRL2 Logic-High Input
Voltage
V
2.2
-1
0
V
µA
V
IH
Input Logic Current
I
I
+1
2.5
2.5
IH, IL
PLVLSET Input-Voltage Range
DET_VIN Input-Voltage Range
V
V
IN
IN
0
V
Maxim Integrated
│
2
MAX2092
700MHz to 2700MHz Analog VGA with Threshold
Alarm Circuit and Error Amplifier for Level Control
Recommended AC Electrical Characteristics
PARAMETER
RF Frequency
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
f
(Note 6)
700
2700
MHz
RF
AC Electrical Characteristics
(
Typical Application Circuit
with analog attenuator set for maximum gain, V
= 4.75V to 5.8V, f
= 1835MHz, P
= -16dBm
RFIN
CC
RF
(CW), T
= -40°C to +95°C, and RF ports are connected to 50Ω sources and loads, unless otherwise noted. Typical values are at
C
T
= +25°C, V
= 5.5V, P
= -16dBm, V
= 2.5V, CTRL1 = 1, CTRL2 = 0. Min/max specifications apply over supply,
C
CC
RF_IN
PLVLSET
process, and temperature, unless otherwise noted.) (Notes 5, 7)
PARAMETER
Small-Signal Gain
SYMBOL
CONDITIONS
MIN
TYP
17.3
18.1
18.1
-0.007
0.22
0.03
0.03
0.03
0.1
MAX
UNITS
dB
f
f
f
= 974MHz
RF
RF
RF
G
= 1835MHz
= 2200MHz
Gain vs. Temperature
dB/°C
974MHz 50MHz
1835MHz 50MHz
1835MHz 80MHz
1835MHz 100MHz
2200MHz 100MHz
Gain Flatness vs. Frequency
dB
P-P
dB
f
f
f
f
f
f
= 974MHz
= 1835MHz
= 2200MHz
= 974MHz
= 1835MHz
= 2200MHz
5.0
5.2
RF
RF
RF
RF
RF
RF
Noise Figure
NF
5.5
40.1
40.4
39.2
Total Attenuation Range
dB
Output Second-Order Intercept
Point
P
= +2dBm/tone,
RFOUT
D
f = 1MHz, f
1
+ f
2
OIP2
OIP3
50
dBm
dBm
f
f
f
= 974MHz
= 1835MHz
= 2200MHz
34.3
32.5
31.4
18.2
52
RF
RF
RF
P
=
RFOUT
Output Third-Order Intercept
Point
+2dBm/tone,
D
f = 1MHz
Output -1dB Compression Point
Second Harmonic
P
(Note 8)
dBm
dBc
dBc
dB
-1dB
P
P
= +5dBm
RFOUT
RFOUT
Third Harmonic
= +5dBm
61
Input Return Loss
1835MHz 50MHz
1835MHz 50MHz
18
Output Return Loss
23
dB
ALARM CIRCUIT (CTRL1 = 1 CTRL2 = 1)
Lower Alarm Threshold
Upper Alarm Threshold
Hysteresis
Input = DET_VIN
Input = DET_VIN
0.175
2.25
29
V
V
mV
V
Alarm Output Logic 1
3.135
3.3
3.465
0.4
Output =
ALM
Output =
ALM
Alarm Output Logic 0
V
Maxim Integrated
│
3
MAX2092
700MHz to 2700MHz Analog VGA with Threshold
Alarm Circuit and Error Amplifier for Level Control
AC Electrical Characteristics (continued)
(
Typical Application Circuit
with analog attenuator set for maximum gain, V
= 4.75V to 5.8V, f
= 1835MHz, P
= -16dBm
CC
RF
RFIN
(CW), T
= -40°C to +95°C, and RF ports are connected to 50Ω sources and loads, unless otherwise noted. Typical values are at
C
T
= +25°C, V
= 5.5V, P
= -16dBm, V
= 2.5V, CTRL1 = 1, CTRL2 = 0. Min/max specifications apply over supply,
C
CC
RF_IN
PLVLSET
process, and temperature, unless otherwise noted.) (Notes 5, 7)
PARAMETER SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
ANALOG ATTENUATOR (CTRL1 = 1, CTRL2 = 0)
Minimum Attenuator Control
Voltage
Input = PLVLSET
Input = PLVLSET
0.25
2.3
V
V
Maximum Attenuator Control
Voltage
Average Gain-Control Slope
Maximum Gain-Control Slope
V
V
= 0.25V to 2.3V
= 0 to 2.5V
19.4
27
dB/V
dB/V
PLVLSET
PLVLSET
Note 5: Production tested at
T
= +95°C. All other temperatures guaranteed by design and characterization.
C
Note 6:
Recommended functional range, not production tested. Operation outside this range is possible, but with degraded
performance of some parameters.
Note 7:
All limits include external component losses. Output measurements are taken at the RF port of the
Typical Application
Circuit
.
Note 8:
It is advisable not to continuously operate the VGA RF-input above +12dBm.
Typical Operating Characteristics
(
Typical Application Circuit
with analog attenuator set to minimum attenuation, V
= 4.75V to 5.8V, f
= -16dBm, T
= -40°C to
RF C
CC
+95°C, and RF ports are connected to 50Ω sources and loads, unless otherwise noted. Typical values are at T
= +25°C, V
= 5.5V,
C
CC
P
= -16dBm, CTRL1 = 1, CTRL2 = 0, V
= 2.5V, unless otherwise noted.)
RF
PLVLSET
GAIN OVER V
SETTING
PLVLSET
GAIN vs. RF FREQUENCY
GAIN vs. RF FREQUENCY
vs. RF FREQUENCY
20
20
25
15
5
2.5V
T
= -40°C
= +95°C
C
V
= 4.75V, 5.00V, 5.50V, 5.80V
T
C
= +25°C
CC
18
16
14
18
16
14
1.5V
2.0V
1.0V
T
C
-5
0.5V
-15
-25
0V
700
1200
1700
2200
2700
700
1200
1700
2200
2700
700
1200
1700
2200
2700
RF FREQUENCY (MHz)
RF FREQUENCY (MHz)
RF FREQUENCY (MHz)
Maxim Integrated
│
4
MAX2092
700MHz to 2700MHz Analog VGA with Threshold
Alarm Circuit and Error Amplifier for Level Control
Typical Operating Characteristics (continued)
(
Typical Application Circuit
with analog attenuator set to minimum attenuation, V
= 4.75V to 5.8V, f
= -16dBm, T
= -40°C to
RF C
CC
+95°C, and RF ports are connected to 50Ω sources and loads, unless otherwise noted. Typical values are at T
= +25°C, V
= 5.5V,
C
CC
P
= -16dBm, CTRL1 = 1, CTRL2 = 0, V
= 2.5V, unless otherwise noted.)
RF
PLVLSET
GAIN vs. V
SETTING
S11 vs. V
SETTING
S11 vs. RF FREQUENCY
PLVLSET
PLVLSET
25
15
5
0
-10
-20
-30
0
2700MHz
-10
T
C
= -40°C
700MHz
-20
-30
-40
2200MHz
974MHz
-5
T
= +25°C
= +95°C
C
2700MHz
-15
-25
1835MHz
T
C
700MHz, 974MHz, 1835MHz, 2200MHz
0
0.5
1.0
V
1.5
(V)
2.0
2.5
0
0.5
1.0
V
1.5
(V)
2.0
2.5
700
1200
1700
2200
2700
RF FREQUENCY (MHz)
PLVLSET
PLVLSET
REVERSE-ISOLATION OVER V
PLVLSET
S22 vs. V
SETTING
S22 vs. RF FREQUENCY
SETTING vs. RF FREQUENCY
PLVLSET
0
-10
-20
-30
80
70
60
50
40
30
20
0
-10
-20
-30
-40
2700MHz
T
= +95°C
C
T
C
= -40°C
2200MHz
700MHz
V
= 0V
PLVLSET
V
= 2.5V
2200
PLVLSET
974MHz
T
C
= +25°C
2200
1835MHz
0
0.5
1.0
V
1.5
2.0
2.5
700
1200
1700
2700
700
1200
1700
2700
(V)
RF FREQUENCY (MHz)
RF FREQUENCY (MHz)
PLVLSET
GAIN vs. V
SETTING
GAIN vs. V
SETTING
GAIN vs. V
SETTING
PLVLSET
PLVLSET
PLVLSET
25
15
5
25
15
5
25
15
5
f
= 1835MHz
f
= 974MHz
f
= 700MHz
RF
RF
RF
T
= -40°C, +25°C, +95°C
T
C
= -40°C, +25°C, +95°C
T =
-40°C, +25°C, +95°C
C
C
-5
-5
-5
-15
-25
-15
-25
-15
-25
0
0.5
1.0
1.5
(V)
2.0
2.5
0
0.5
1.0
1.5
(V)
2.0
2.5
0
0.5
1.0
1.5
(V)
2.0
2.5
V
V
V
PLVLSET
PLVLSET
PLVLSET
Maxim Integrated
│
5
MAX2092
700MHz to 2700MHz Analog VGA with Threshold
Alarm Circuit and Error Amplifier for Level Control
Typical Operating Characteristics (continued)
(
Typical Application Circuit
with analog attenuator set to minimum attenuation, V
= 4.75V to 5.8V, f
= -16dBm, T
= -40°C to
RF C
CC
+95°C, and RF ports are connected to 50Ω sources and loads, unless otherwise noted. Typical values are at T
= +25°C, V
= 5.5V,
C
CC
P
= -16dBm, CTRL1 = 1, CTRL2 = 0, V
= 2.5V, unless otherwise noted.)
RF
PLVLSET
GAIN vs. V
SETTING
GAIN vs. V
SETTING
NOISE FIGURE vs. RF FREQUENCY
PLVLSET
PLVLSET
25
15
5
25
15
5
8
7
6
5
4
3
f
= 2200MHz
f
= 2700MHz
RF
RF
T
= +95°C
C
T
= -40°C, +25°C, +95°C
T
= -40°C, +25°C, +95°C
C
C
T
= +25°C
C
-5
-5
-15
-25
-15
-25
T
C
= -40°C
0
0.5
1.0
V
1.5
(V)
2.0
2.5
0
0.5
1.0
V
1.5
(V)
2.0
2.5
700
1200
1700
2200
2700
RF FREQUENCY (MHz)
PLVLSET
PLVLSET
NOISE FIGURE vs. RF FREQUENCY
OUTPUT IP3 vs. RF FREQUENCY
OUTPUT IP3 vs. RF FREQUENCY
8
7
6
5
4
3
40
35
30
25
40
35
30
25
P
= 2dB
m
/
T
ONE
P
= 2dB
m
/
T
ONE
OUT
OUT
T
C
= -40°C
V
= 5.50V
V
CC
= 5.80V
V
= 4.75V, 5.00V, 5.50V, 5.80V
CC
CC
T
C
= +95°C
V
= 4.75V
CC
T
C
= +25°C
V
CC
= 5.00V
700
1200
1700
2200
2700
700
1200
1700
2200
2700
700
1200
1700
2200
2700
RF FREQUENCY (MHz)
RF FREQUENCY (MHz)
RF FREQUENCY (MHz)
OUTPUT IP3 vs. V
SETTING
)
OUTPUT IP3 vs. V
SETTING
PLVLSET
PLVLSET
(CONSTANT P
(CONSTANT P
)
OUT
IN
OUTPUT P
vs. RF FREQUENCY
1dB
37
35
33
31
29
27
37
35
33
31
29
27
20
19
18
17
16
15
f
= 1835MHz
f
= 1835MHz
RF
RF
T
= -40°C LSB, USB
C
T
= -40°C LSB, USB
T
= -40°C
= +95°C
P
OUT
= 2dBm
/
T
ONE
P =
-6dBm
/
T
ONE
C
C
IN
T
C
= +25°C
T
C
T
= +25°C LSB, USB
T
C
= +25°C LSB, USB
C
T
C
= +95°C LSB
T
= +95°C USB
C
T
C
= +95°C LSB
T
C
= +95°C USB
0.9
1.3
1.7
2.1
2.5
0.9
1.3
1.7
2.1
2.5
700
1200
1700
2200
2700
V
(V)
V
(V)
PLVLSET
PLVLSET
RF FREQUENCY (MHz)
Maxim Integrated
│
6
MAX2092
700MHz to 2700MHz Analog VGA with Threshold
Alarm Circuit and Error Amplifier for Level Control
Typical Operating Characteristics (continued)
(
Typical Application Circuit
with analog attenuator set to minimum attenuation, V
= 4.75V to 5.8V, f
= -16dBm, T
= -40°C to
RF C
CC
+95°C, and RF ports are connected to 50Ω sources and loads, unless otherwise noted. Typical values are at T
= +25°C, V
= 5.5V,
C
CC
P
= -16dBm, CTRL1 = 1, CTRL2 = 0, V
= 2.5V, unless otherwise noted.)
RF
PLVLSET
OUTPUT P
vs. RF FREQUENCY
2nd HARMONIC vs. RF FREQUENCY
2nd HARMONIC vs. RF FREQUENCY
1dB
20
19
18
17
16
15
65
65
55
45
35
P
= 5dBm
V
= 4.75V
= 5.00V
OUT
P
= 5dBm
CC
OUT
V
= 5.80V
CC
V
CC
V
= 5.50V
CC
T
= -40°C
C
55
45
35
V
= 5.50V
V
= 4.75V
CC
CC
T
= +95°C
C
V
CC
= 5.25V
V
= 5.80V
CC
T
= +25°C
C
V
= 5.00V
2200
CC
700
1200
1700
2700
700
1200
1700
2200
2700
700
700
0.75
1200
1700
2200
2700
RF FREQUENCY (MHz)
RF FREQUENCY (MHz)
RF FREQUENCY (MHz)
2nd HARMONIC vs. V
SETTING
2nd HARMONIC vs. V
SETTING
PLVLSET
PLVLSET
(CONSTANT P
)
(CONSTANT P
)
3rd HARMONIC vs. RF FREQUENCY
OUT
IN
65
55
45
35
90
80
70
60
50
40
80
70
60
50
40
f
P
= 1835MHz
= 5dBm
f
= 1835MHz
RF
P =
-6dBm
RF
P
= 5dBm
OUT
OUT
IN
T
= -40°C
= +95°C
C
T
= -40°C
= +95°C
C
T
= -40°C
= +95°C
C
T
= +25°C
C
T =
+25°C
C
T
C
= +25°C
T
C
T
C
T
C
0.9
1.3
1.7
2.1
2.5
0.75
1.00
1.25
1.50
1.75
1200
1700
2200
2700
V
(V)
V
(V)
RF FREQUENCY (MHz)
PLVLSET
PLVLSET
3rd HARMONIC vs. V
SETTING
3rd HARMONIC vs. V
SETTING
PLVLSET
PLVLSET
(CONSTANT P
)
(CONSTANT P
)
3rd HARMONIC vs. RF FREQUENCY
OUT
IN
80
70
60
50
40
110
100
90
80
70
60
50
40
f
= 1835MHz
f
RF
= 1835MHz
P =
-6dBm
P
= 5dBm
RF
P
OUT
= 5dBm
OUT
IN
T
C
= -40°C
V
= 4.75V, 5.00V, 5.50V, 5.80V
CC
T
= -40°C
C
80
T
C
= +25°C
T
C
= +25°C
70
T
C
= +95°C
T
= +95°C
1.50
C
60
50
0.9
1.3
1.7
2.1
2.5
1.00
1.25
1.75
700
1200
1700
2200
2700
V
(V)
V
(V)
PLVLSET
RF FREQUENCY (MHz)
PLVLSET
Maxim Integrated
│
7
MAX2092
700MHz to 2700MHz Analog VGA with Threshold
Alarm Circuit and Error Amplifier for Level Control
Typical Operating Characteristics (continued)
(
Typical Application Circuit
with analog attenuator set to minimum attenuation, V
= 4.75V to 5.8V, f
= -16dBm, T
= -40°C to
RF C
CC
+95°C, and RF ports are connected to 50Ω sources and loads, unless otherwise noted. Typical values are at T
= +25°C, V
= 5.5V,
C
CC
P
= -16dBm, CTRL1 = 1, CTRL2 = 0, V
= 2.5V, unless otherwise noted.)
RF
PLVLSET
OIP2 vs. RF FREQUENCY
OIP2 vs. RF FREQUENCY
65
55
45
35
65
V
= 4.75V
CC
P
=
P
=
2
d
B
m
/ TONE
OUT
OUT
T
= -40°C
V
= 5.00V
C
CC
55
T
= +25°C
C
45
= +95°C
V
= 5.50V
CC
T
C
V
= 5.80V
CC
35
1700
700
2200
120
0
2700
1700
RF FREQUENCY (MHz)
RF FREQUENCY (MHz)
700
1200
2200
2700
OIP2 vs. V
SETTIN
O
G
IP2 vs. V
SETTING
IN
PLVLSET
PLVLSET
(CONSTANT P
)
(CONSTANT P
)
OUT
65
55
45
35
65
f
P
= 1835MHz
f
P
= 1835MHz
RF
RF
= 2dBm/ TONE
= -6dBm/ TONE
OUT
IN
T
= -40°C
C
T
= -40°C
= +95°C
C
55
45
T
C
= +25°C
T
C
= +25°C
1.3
T
C
= +95°C
T
C
35
0.9
1.7
0.75
2.1
1.00
2.5
1.25
1.50
1.75
V
(V)
V
(V)
PLVLSET
PLVLSET
Maxim Integrated
│
8
MAX2092
700MHz to 2700MHz Analog VGA with Threshold
Alarm Circuit and Error Amplifier for Level Control
Pin Configuration
TOP VIEW
15
14
13
12
11
CTRL2
GND
10
9
GND 16
GND 17
GND 18
MAX2092
8
DET_VIN
GND
GND
7
19
20
6
AMP_OUT
RF_IN
+
1
2
3
4
5
TQFN
Pin Description
PIN
NAME
CTRL1
R_BIAS
V
CC_A
FUNCTION
1
Control-Mode Logic Input 1 (3.3V Logic)
2
Bias Resistor Setting Input. Connect a resistor from this pin to ground.
Power-Supply Input. Bypass to ground with a 0.01
F
F capacitor as close as possible to the pin.
Output-Power Level-Setting DC Input or Analog Attenuator Control Voltage
Alarm Logic Output
3
4
PLVLSET
ALM
5
6
7, 13–19
8
AMP_OUT
GND
Error-Amplifier Output
Ground
DET_VIN
Error-Amplifier Input Voltage from an External Detector
Do not directly connect to EP.
Connect to RF ground plane with a short trace using a
separate via hole.
9
GND
CTRL2
V
CC_RF
10
11
Control-Mode Logic Input 2 (3.3V Logic)
Driver-Amplifier Supply Voltage Input. Bypass to ground with a 0.01
F
F capacitor as close as
possible to the pin.
12
20
RF_OUT
RF_IN
Driver-Amplifier Output (50
I
). Requires a DC-blocking capacitor.
Attenuator Input (50
I
). Requires a DC-blocking capacitor.
Exposed Pad. Internally connected to GND. Solder the exposed pad to a PCB pad that uses
multiple ground vias to provide heat transfer out of the device into the PCB ground planes. These
multiple via grounds are also required to achieve the noted RF performance. See the
Layout
Considerations
section.
—
EP
Maxim Integrated
│
9
MAX2092
700MHz to 2700MHz Analog VGA with Threshold
Alarm Circuit and Error Amplifier for Level Control
tor whose output ranges from 0V DC to 2.5V DC (output
coupler at RF_OUT already taken into account).
An error
Detailed Description
The MAX2092 is a high-linearity analog VGA designed to
interface with 50Ω systems operating in the 700MHz to
2700MHz frequency range. The analog attenuator is con-
trolled by an external analog control voltage. The device
features a gain range of 18.1dB to -22.3dB, a noise figure
of 5.2dB, OIP3 linearity of +32.5dBm, and a wide RF
bandwidth. Each of these features makes the device an
ideal VGA for numerous receiver and transmitter applica-
tions. In addition, the device operates from a single +5V
supply.
amplifier compares the DET_VIN voltage to PLVLSE
T
,
and drives the attenuator in servo fashion until the error-
amplifier’s differential input error voltage is near zero. The
servo loop acts to maintain a regulated output power level
over an input power range depending on the setting of
PLVLSE
T
.
When used in conjunction with the MAX2091 IF VGA,
it is recommended that an external voltage of 1.65V be
applied to the IF PLVLSE
T
.
T
his ensures that a nominal
RF signal level of approximately -3dBm is output from the
MAX2091. With
this specific level setting, the complete
MAX2091 + MAX2092 cascade yields a constant RF
output power of -20.5dBm to +5dBm (depending on the
setting of RF PLVLSET) over an IF input power range
of -24dBm to +1dBm.
See Figure 1 for details.
Contact
the factory for additional details surrounding Maxim’s
MAX2091 + MAX2092 reference design.
Applications Information
Modes of Operation
The device can operate in several different modes, as
summarized in
T
a
ble 1.
VGA-Only Mode Operation
VGA-only mode operation consists of setting CTRL1 =
logic 1 and CTRL2 = logic 0, and applying a DC value to
PLVLSET between 0V and 2.5V DC to manually adjust the
attenuation, and subsequently the RF_OUT power to any
desired value. The output power at RF_OUT increases at
a rate of 19.4dB/V as PLVLSET is increased. In VGA-only
mode, operation components R5, R6, R7, and C8–C11 can
be left unpopulated, and CTRL2 needs to be tied directly
to ground.
Control Inputs
The device has three control inputs: CTRL1, CTRL2,
and PLVLSE
T
. V
must be present before voltages are
CC
applied to these pins. In cases where this is not possible,
a 200Ω resistor must be included in series with the control
inputs to limit on-chip ESD diode conduction. CTRL1 and
CTRL2 are 3V logic controls, and cannot be driven from
5V logic. In the case where no logic control is available
and a logic high is required, a voltage divider can be used
Closed-ALC Mode Operation
from the 5V
V
CC
supply to produce the 3V logic-high.
Closed-ALC mode operation consists of setting CTRL1
= CTRL2 = logic 1. The voltage on PLVLSET is set
externally to adjust output power from -20dBm to +5dBm
when input power is in the recommended power range,
typically -6dBm. See the
Typical Application Circuit
. As
PLVLSET increases, the output power also increases at a
rate set by the external detector chosen. Ideally, a detec-
tor with an output voltage range of 0.1V DC to 2.4V DC is
recommended, but the device operates with any detec-
Alarm Operation
The alarm remains in logic-high state when the voltage on
DET_VIN (pin 8) is within the 0.175V to 2.25V range.
The
alarm threshold amount is an internal fixed value to the
device with a nominal hysteresis of approximately 29mV.
Table 1. Control Mode Logic
CTRL1
CTRL2
VGA
ALC LOOP
Disabled
ALARM
FUNCTIONAL DESCRIPTION
Power-Down Mode
0
1
0
0
Disabled
Enabled
Disabled
Disabled
Disabled
VGA-Only Mode
Closed ALC Mode. ALC loop locks DET_VIN to
PLVLSE
T
.
1
0
1
1
Enabled
—
Enabled
—
Enabled
—
Factory
T
e
st Mode (Do Not Use)
Maxim Integrated
│
10
MAX2092
700MHz to 2700MHz Analog VGA with Threshold
Alarm Circuit and Error Amplifier for Level Control
2.5dB PAD
38dB
40dB
IF_IN
-24dBm
TO +1dBm
RF_OUT
-20.5dBm
TO +5dBm
MAX2092
MAX2091
LO
ALARM
THRESHOLDS
RF
ALARM
OUT
IF
ALARM
OUT
IF PLVLSET
(ANALOG CONTROL)
INPUT
FROM
EXTERNAL
DETECTOR
ALARM
THRESHOLD
RF PLVLSET
(ANALOG CONTROL)
INPUT
FROM EXTERNAL
DETECTOR
Figure 1. Cascaded IF-RF Lineup Using the MAX2091 + MAX2092
DET_VIN
Layout Considerations
In closed ALC-loop mode, avoid directly loading pins
AMP_OUT and DET_VIN with capacitance in excess of
10pF on each pin. In closed ALC-loop mode, this can
cause ringing or instability in the power-control loop.
As
in any closed-loop system, one must be careful not to load
DET_VIN or AMP_OUT with additional external circuitry.
Therefore, it is suggested that in the closed-loop ALC
mode, no additional connections be made to DET_VIN
or AMP_OU
T
.
A
MP_OUT and DET_VIN support a total
trace routing capacitance of 10pF or less. Connect pin
9 to the RF ground plane with a via separated from
the exposed pad (EP) ground connection. Pin 9 must
not connect to the exposed pad or share a ground with
any other component, and must connect directly to the
solid ground plane below. As a reference, refer to the
MAX2092EVKIT+ PCB artwork.
The pin configuration of the MAX2092 is optimized to
facilitate a very compact physical layout of the device
and its associated discrete components. The exposed
pad of the device’s 20-pin TQFN-EP package provides a
low thermal-resistance path to the die. It is important that
the PCB on which the device is mounted be designed to
conduct heat from the E
P
.
I
n addition, provide the EP with
a low inductance path to electrical ground. The EP
MUST
be soldered to a ground plane on the PCB, either directly
or through an array of plated via holes. Pin 9 must not
connect to the exposed pad or share a ground with any
other component and must connect directly to the solid
ground plane below.
Maxim Integrated
│
11
MAX2092
700MHz to 2700MHz Analog VGA with Threshold
Alarm Circuit and Error Amplifier for Level Control
Table 2. Typical Application Circuit Component Values
MODE OF OPERATION
COMPONENT
VALUE
SIZE
VENDOR
DESCRIPTION
CLOSED
ALC
VGA ONLY
ü
ü
ü
ü
ü
ü
ü
ü
ü
—
ü
ü
ü
ü
ü
C1
C2, C3
C5
12pF
0.01
F
F
8.2pF
0402
0402
0402
0603
0402
0402
0402
0402
0402
0402
0402
0402
0402
Murata
Murata
C0G dielectric
X7R dielectric
C0G dielectric
X7R dielectric
C0G dielectric
C0G dielectric
C0G dielectric
—
ü
Murata
C8
—
—
—
—
—
ü
100nF
680pF
120pF
120pF
Do not install
1.78k
I
200
I
Murata
C9
Murata
C10
C11
C14*
R1
Murata
Murata
—
Panasonic
Panasonic
Panasonic
Panasonic
Panasonic
1% tolerance
1% tolerance
5% tolerance
5% tolerance
5% tolerance
R5
—
—
—
ü
R6
51
I
R7
10k
I
R11*
0
I
20-pin TQFN
(5mm x 5mm)
ü
ü
U1
—
Maxim
MAX2092ETP+
Note:
The checkmarks in the Mode of Operation columns indicate that the component is used within each respective application.
*C14 and R11 form an optional lowpass network to filter out potential noise from the external PLVLSET control source.
Maxim Integrated
│
12
MAX2092
700MHz to 2700MHz Analog VGA with Threshold
Alarm Circuit and Error Amplifier for Level Control
Typical Application Circuit
RF_OUT
V
CC
C5
C3
15
14
13
12
11
R6
GND
16
CTRL2
GND*
10
9
CTRL2
C10
MAX2092
GND
17
EP
R7
DET_VIN
GND
18
DET_IN
8
GND
19
GND
7
C1
RF_IN
C8
R5
RF_IN
20
AMP_OUT
6
V
V
LOW HIGH
C9
+
1
2
3
4
5
V
CC
C11
R1
C2
C14
R11
*SEE PIN DESCRIPTION
Maxim Integrated
│
13
MAX2092
700MHz to 2700MHz Analog VGA with Threshold
Alarm Circuit and Error Amplifier for Level Control
Ordering Information
Package Information
For the latest package outline information and land patterns (foot-
PART
TEMP RANGE
PIN-PACKAGE
a “+”, “#”, or “-” in the package code indicates RoHS status only.
Package drawings may show a different suffix character, but the
drawing pertains to the package regardless of RoHS status.
MAX2092ETP+
MAX2092ETP+T
-40
N
C to +95
N
C
-40
N
C to +95
N
C
20 TQFN-EP*
20 TQFN-EP*
+
Denotes a lead(Pb)-free/RoHS-compliant package.
*
EP = Exposed pad.
*
T = Tape and reel.
PACKAGE
TYPE
PACKAGE
CODE
OUTLINE
NO.
LAND
PATTERN NO.
20 TQFN
T2055+3
Chip Information
PROCESS: SiGe BiCMOS
Maxim Integrated
│
14
MAX2092
700MHz to 2700MHz Analog VGA with Threshold
Alarm Circuit and Error Amplifier for Level Control
Revision History
REVISION REVISION
PAGES
DESCRIPTION
CHANGED
NUMBER
DATE
0
6/12
Initial release
—
Removed military reference from
Applications
and updated the
Benefits and Features
section
1
7/15
1
Maxim Integrated cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim Integrated product. No circuit patent licenses
are implied. Maxim Integrated reserves the right to change the circuitry and specifications without notice at any time. The parametric values (min and max limits)
shown in the Electrical Characteristics table are guaranteed.
Other parametric values quoted in this data sheet are provided for guidance.
©
Maxim Integrated and the Maxim Integrated logo are trademarks of Maxim Integrated Products, Inc.
2015 Maxim Integrated Products, Inc.
│
15
