19-3508; Rev 0; 2/05
IT
TION K
VALUA
E
BLE
AVAILA
800MHz to 1000MHz Variable-Gain
Amplifier with Analog Gain Control
General Description
Features
♦
800MHz to 1000MHz RF Frequency Range*
♦
39dBm Constant OIP3 (Over All Gain Settings)
♦
23.5dBm Output 1dB Compression Point
♦
15.5dB Typical Gain at Maximum Gain Setting
♦
0.15dB Gain Flatness Over 100MHz Bandwidth
♦
4.5dB Noise Figure at Maximum Gain Setting
(Using 1 Attenuator)
♦
Two Gain-Control Ranges: 22dB and 44dB
♦
Analog Gain Control
♦
Single +5V Supply Voltage
♦
Pin Compatible with MAX2057, 1700MHz to
2500MHz RF VGA
♦
External Current-Setting Resistors Provide Option
for Operating VGA in Reduced-Power/Reduced-
Performance Mode
♦
Lead-Free Package Available
*Note:
Operation beyond this range is possible, but has not been
characterized.
MAX2056
The MAX2056 general-purpose, high-performance vari-
able-gain amplifier (VGA) is designed to operate in the
800MHz to 1000MHz frequency range*. This device fea-
tures 15.5dB of gain, 4.5dB of noise figure, and an out-
put 1dB compression point of 23.5dBm. The MAX2056
also provides an exceptionally high OIP3 level of
39dBm, which is maintained over the entire attenuation
range. In addition, the on-chip analog attenuators yield
infinite control and high attenuation accuracy over
selectable 22dB or 44dB control ranges. Each of these
features makes the MAX2056 an ideal VGA for cellular
band GSM, cdma2000
®
, W-CDMA, and iDEN
®
transmit-
ter and power amplifier AGC circuits.
The MAX2056 is pin compatible with the MAX2057
1700MHz to 2500MHz VGA, making this family of
amplifiers ideal for applications where a common PC
board layout is used for both frequency bands.
The MAX2056 operates from a single +5V supply and is
available in a compact 36-pin thin QFN package (6mm
x 6mm x 0.8mm) with an exposed pad. Electrical per-
formance is guaranteed over the extended -40°C to
+85°C temperature range.
Applications
GSM 850/GSM 900 2G and 2.5G EDGE Base-
Station Transmitters and Power Amplifiers
Cellular cdmaOne™, cdma2000, and Integrated
Digital Enhanced Network (iDEN) Base-Station
Transmitters and Power Amplifiers
W-CDMA 850MHz and Other 3G Base-Station
Transmitters and Power Amplifiers
Transmitter Gain Control
Receiver Gain Control
Broadband Systems
Automatic Test Equipment
Digital and Spread-Spectrum Communication
Systems
Microwave Terrestrial Links
Ordering Information
PART
MAX2056ETX
MAX2056ETX-T
MAX2056ETX+D
MAX2056ETX+TD
TEMP
RANGE
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
PIN-PACKAGE
PKG
CODE
36 Thin QFN-EP**
T3666-2
6mm x 6mm
36 Thin QFN-EP**
T3666-2
6mm x 6mm
36 Thin QFN-EP**
T3666-2
6mm x 6mm
36 Thin QFN-EP**
T3666-2
6mm x 6mm
**EP
= Exposed paddle.
+
= Lead (Pb) free.
D
= Dry pack.
T = Tape-and-reel package.
Pin Configuration/Functional Diagram appears at end of data
sheet.
cdmaOne is a trademark of CDMA Development Group.
cdma2000 is a registered trademark of Telecommunications
Industry Association.
iDEN is a registered trademark of Motorola, Inc.
________________________________________________________________
Maxim Integrated Products
1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
800MHz to 1000MHz Variable-Gain
Amplifier with Analog Gain Control
MAX2056
ABSOLUTE MAXIMUM RATINGS
V
CC
to GND ...........................................................-0.3V to +5.5V
V
CNTL
to GND (with V
CC
applied)................................0 to 4.75V
Current into V
CNTL
Pin (V
CC
grounded) .............................40mA
All Other Pins to GND.................................-0.3V to (V
CC
+ 0.3V)
RF Input Power (IN, IN_A, ATTN_OUT, OUT_A) ............+20dBm
RF Input Power (AMP_IN)...............................................+12dBm
θ
JA
(natural convection)...................................................35°C/W
θ
JA
(1m/s airflow) .............................................................31°C/W
θ
JA
(2.5m/s airflow) ..........................................................29°C/W
θ
JC
(junction to exposed paddle) ....................................10°C/W
Operating Temperature Range ...........................-40°C to +85°C
Storage Temperature Range .............................-65°C to +150°C
Junction Temperature ......................................................+150°C
Lead Temperature (soldering, 10s) .................................+300°C
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.
DC ELECTRICAL CHARACTERISTICS
(V
CC
= +4.75V to +5.25V, no RF signals applied, all input and output ports terminated with 50Ω, T
A
= -40°C to +85°C, unless other-
wise noted. Typical values are at V
CC
= +5.0V, T
A
= +25°C, unless otherwise noted.)
PARAMETER
Supply Voltage
Supply Current
R
SET1
Current
R
SET2
Current
Gain-Control Voltage Range
Gain-Control Pin Input Resistance
R1 = 1.2kΩ, R2 = 3.92kΩ (Note 1)
R1 = 1.2kΩ (Note 1)
R2 = 3.92kΩ (Note 1)
(Note 2)
V
CNTL
= 1V to 4.5V
1.0
250
500
CONDITIONS
MIN
4.75
TYP
5
136
1
0.33
4.5
MAX
5.25
167
UNITS
V
mA
mA
mA
V
kΩ
AC ELECTRICAL CHARACTERISTICS
(Typical Operating Circuit with one attenuator connected, V
CC
= +4.75V to +5.25V, T
A
= -40°C to +85°C, unless otherwise noted.
Typical values are at V
CC
= +5.0V, R1 = 1.2kΩ, R2 = 3.92kΩ, P
OUT
= +5dBm, f
IN
= 900MHz, V
CNTL
= 1V, 50Ω system impedance,
second attenuator is not connected, T
A
= +25°C, unless otherwise noted.) (Note 3)
PARAMETER
Frequency Range
Gain
T
A
= +25°C
V
CNTL
= 1V
T
A
= +25°C to -40°C
Maximum Gain Variation
T
A
= +25°C to +85°C
V
CNTL
= 1.8V
V
CNTL
= 2.6V
V
CNTL
= 3.5V
V
CNTL
= 1V
V
CNTL
= 1.8V
V
CNTL
= 2.6V
V
CNTL
= 3.5V
Reverse Isolation
Noise Figure
Output 1dB Compression Point
Output 2nd-Order Intercept Point
Output 3rd-Order Intercept Point
From maximum gain to 15dB attenuation,
measured at f
1
+ f
2
(Note 5)
From maximum gain to 15dB attenuation (Note 5)
(Note 4)
CONDITIONS
MIN
800
15.5
+0.82
+0.26
+0.25
-0.18
-0.51
-0.11
-0.16
+0.09
29
4.5
+23.5
+54
+39
dB
dB
dBm
dBm
dBm
dB
TYP
MAX
1000
UNITS
MHz
dB
2
_______________________________________________________________________________________
800MHz to 1000MHz Variable-Gain
Amplifier with Analog Gain Control
AC ELECTRICAL CHARACTERISTICS (continued)
(Typical Operating Circuit with one attenuator connected, V
CC
= +4.75V to +5.25V, T
A
= -40°C to +85°C, unless otherwise noted.
Typical values are at V
CC
= +5.0V, R1 = 1.2kΩ, R2 = 3.92kΩ, P
OUT
= +5dBm, f
IN
= 900MHz, V
CNTL
= 1V, 50Ω system impedance,
second attenuator is not connected, T
A
= +25°C, unless otherwise noted.) (Note 3)
PARAMETER
Output 3rd-Order Intercept Point
Variation Over Temperature
2nd Harmonic
3rd Harmonic
RF Gain-Control Range
RF Gain-Control Slope
Maximum RF Gain-Control Slope
Gain Flatness Over 100MHz Bandwidth
Attenuator Switching Time
Attenuator Insertion Loss
Input Return Loss
Output Return Loss
Group Delay
Group Delay Flatness Over 100MHz
Bandwidth
Group Delay Change vs. Gain Control
Insertion Phase Change vs. Gain Control
Maximum slope vs. gain-control voltage
Peak-to-peak for all settings
15dB attenuation change (Note 6)
Second attenuator (IN_A, OUT_A)
Entire band, all gain settings
Entire band, all gain settings
Input/output 50Ω lines de-embedded
Peak to peak
V
CNTL
= 1V to 4V
V
CNTL
= 1V to 4V
CONDITIONS
T
A
= +25°C to +85°C
T
A
= +25°C to -40°C
From maximum gain to 15dB attenuation, P
OUT
=
+5dBm
From maximum gain to 15dB attenuation, P
OUT
=
+5dBm
f
RF
= 800MHz to 1000MHz,
V
CNTL
= 1V to 4.5V
One attenuator
Two attenuators
18.3
36.6
MIN
TYP
-0.46
+1.35
-55
-68
22.3
44.6
-10.7
-17.2
0.15
500
1.7
15
15
600
100
100
20
MAX
UNITS
dB
dBc
dBc
dB
dB/V
dB/V
dB
ns
dB
dB
dB
ps
ps
ps
degrees
MAX2056
Note 1:
Total supply current reduces as R1 and R2 are increased.
Note 2:
Operating outside this range for extended periods may affect device reliability. Limit pin input current to 40mA when V
CC
is
not present.
Note 3:
All limits include external component losses, unless otherwise noted.
Note 4:
Noise figure increases by approximately 1dB for every 1dB of gain reduction.
Note 5:
f
1
= 900MHz, f
2
= 901MHz, +5dBm/tone at OUT.
Note 6:
Switching time is measured from 50% of the control signal to when the RF output settles to ±1dB.
_______________________________________________________________________________________
3
800MHz to 1000MHz Variable-Gain
Amplifier with Analog Gain Control
MAX2056
Typical Operating Characteristics
One Attenuator Configuration
(Typical Application Circuit with
one attenuator
connected, V
CC
= +5.0V, R1 = 1.2kΩ, R2 = 3.92kΩ, f
IN
= 900MHz maximum gain
setting, P
OUT
= +5dBm, linearity measured at P
OUT
= +5dBm/tone, T
A
= +25°C, unless otherwise noted.)
SUPPLY CURRENT vs. V
CC
MAX2056 toc01
INPUT RETURN LOSS
vs. RF FREQUENCY
MAX2056 toc02
OUTPUT RETURN LOSS
vs. RF FREQUENCY
MAX2056 toc03
160
150
SUPPLY CURRENT (mA)
140
130
120
110
100
4.750
T
A
= +85°C
T
A
= +25°C
T
A
= -40°C
0
5
INPUT RETURN LOSS (dB)
10
15
20
25
30
T
A
= +85°C
T
A
= +25°C
T
A
= -40°C
0
5
OUTPUT RETURN LOSS (dB)
T
A
= +25°C
10
T
A
= -40°C
15
20
25
30
T
A
= +85°C
4.875
5.000
V
CC
(V)
5.125
5.250
700 800 900 1000 1100 1200 1300 1400 1500
RF FREQUENCY (MHz)
700 800 900 1000 1100 1200 1300 1400 1500
RF FREQUENCY (MHz)
GAIN vs. V
CNTL
MAX2056 toc04
GAIN vs. RF FREQUENCY
T
A
= -40°C
16
15
GAIN (dB)
14
13
12
11
20
700 800 900 1000 1100 1200 1300 1400 1500
RF FREQUENCY (MHz)
T
A
= +25°C
MAX2056 toc05
REVERSE ISOLATION
vs. RF FREQUENCY
MAX2056 toc06
MAX2056 toc09
20
T
A
= -40°C
15
10
GAIN (dB)
5
0
-5
-10
1.0
1.5
2.0
2.5
V
CNTL
(V)
3.0
3.5
T
A
= +25°C
T
A
= +85°C
17
35
T
A
= +85°C
ISOLATION (dB)
30
T
A
= +25°C
25
T
A
= -40°C
T
A
= +85°C
4.0
700 800 900 1000 1100 1200 1300 1400 1500
RF FREQUENCY (MHz)
INPUT RETURN LOSS
vs. RF FREQUENCY
MAX2056 toc07
OUTPUT RETURN LOSS
vs. RF FREQUENCY
MAX2056 toc08
GAIN vs. RF FREQUENCY
23
18
13
MAXIMUM GAIN
0
5
INPUT RETURN LOSS (dB)
10
MAXIMUM GAIN
15
20
25
21dB GAIN REDUCTION
30
0
5
OUTPUT RETURN LOSS (dB)
10
MAXIMUM GAIN
15
20
GAIN (dB)
8
3
-2
-7
25
30
21dB GAIN REDUCTION
-12
-17
22dB GAIN REDUCTION
700 800 900 1000 1100 1200 1300 1400 1500
RF FREQUENCY (MHz)
700 800 900 1000 1100 1200 1300 1400 1500
RF FREQUENCY (MHz)
700 800 900 1000 1100 1200 1300 1400 1500
RF FREQUENCY (MHz)
4
_______________________________________________________________________________________
800MHz to 1000MHz Variable-Gain
Amplifier with Analog Gain Control
MAX2056
Typical Operating Characteristics (continued)
One Attenuator Configuration
(Typical Application Circuit with
one attenuator
connected, V
CC
= +5.0V, R1 = 1.2kΩ, R2 = 3.92kΩ, f
IN
= 900MHz maximum gain
setting, P
OUT
= +5dBm, linearity measured at P
OUT
= +5dBm/tone, T
A
= +25°C, unless otherwise noted.)
REVERSE ISOLATION
vs. RF FREQUENCY
21dB GAIN REDUCTION
55
REVERSE ISOLATION (dB)
50
45
40
35
30
25
20
700 800 900 1000 1100 1200 1300 1400 1500
RF FREQUENCY (MHz)
MAXIMUM GAIN
2
800
850
900
950
1000
RF FREQUENCY (MHz)
2
800
850
900
950
1000
RF FREQUENCY (MHz)
NOISE FIGURE (dB)
MAX2056 toc10
NOISE FIGURE vs. RF FREQUENCY
MAX2056 toc11
NOISE FIGURE vs. RF FREQUENCY
MAX2056 toc12
60
7
T
A
= +85°C
7
6
T
A
= +25°C
6
NOISE FIGURE (dB)
V
CC
= 5.25V
5
5
4
4
V
CC
= 4.75V
3
V
CC
= 5.00V
3
T
A
= -40°C
OUTPUT IP3 vs. FREQUENCY
MAX2056 toc13
OUTPUT IP3 vs. FREQUENCY
MAX2056 toc14
INPUT IP3 vs. ATTENUATION
MAX2056 toc15
41
T
A
= -40°C
40
OUTPUT IP3 (dBm)
41
50
45
T
A
= +25°C
INPUT IP3 (dBm)
40
35
30
25
20
T
A
= -40°C
T
A
= +85°C
40
OUTPUT IP3 (dBm)
V
CC
= 5.00V
39
V
CC
= 5.25V
39
38
T
A
= +25°C
T
A
= +85°C
38
V
CC
= 4.75V
37
37
36
800
850
900
950
1000
RF FREQUENCY (MHz)
36
800
850
900
950
1000
RF FREQUENCY (MHz)
0
5
10
15
20
25
ATTENUATION (dB)
OUTPUT IP3 vs. ATTENUATION
MAX2056 toc16
OUTPUT IP3 vs. OUTPUT POWER
MAX2056 toc17
OUTPUT IP2 vs. RF FREQUENCY
T
A
= -40°C
60
OUTPUT IP2 (dBm)
T
A
= +25°C
MAX2056 toc18
50
45
OUTPUT IP3 (dBm)
40
35
T
A
= -40°C
30
25
20
0
5
10
15
20
T
A
= +85°C
T
A
= +25°C
40
65
38
OUTPUT IP3 (dBm)
55
T
A
= +85°C
36
50
34
45
32
25
-6
-3
0
3
6
9
12
ATTENUATION (dB)
OUTPUT POWER PER TONE (dBm)
40
800
850
900
950
1000
RF FREQUENCY (MHz)
_______________________________________________________________________________________
5
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