19-3510; Rev 0; 1/05
KIT
ATION
EVALU
BLE
AVAILA
1700MHz to 2500MHz Variable-Gain
Amplifier with Analog Gain Control
General Description
Features
♦
1700MHz to 2500MHz RF Frequency Range*
♦
37dBm Constant OIP3 (Over All Gain Settings)
♦
23.8dBm Output 1dB Compression Point
♦
15.5dB Typical Gain at Maximum Gain Setting
♦
0.5dB Gain Flatness Over 100MHz Bandwidth
♦
6dB Noise Figure at Maximum Gain Setting (Using
1 Attenuator)
♦
Two Gain-Control Ranges: 21dB and 42dB
♦
Analog Gain Control
♦
Single +5V Supply Voltage
♦
Pin Compatible with MAX2056, 800MHz to
1000MHz 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.
MAX2057
The MAX2057 general-purpose, high-performance vari-
able-gain amplifier (VGA) is designed to operate in the
1700MHz to 2500MHz frequency range*. This device
features 15.5dB of gain, 6dB of noise figure, and an out-
put 1dB compression point of 23.8dBm. The MAX2057
also provides an exceptionally high OIP3 level of
37dBm, which is maintained over the entire attenuation
range. In addition, the on-chip analog attenuators yield
infinite control and high attenuation accuracy over
selectable 21dB or 42dB control ranges. Each of these
features makes the MAX2057 an ideal VGA for
DCS/PCS, cdma2000™, W-CDMA, and PHS/PAS trans-
mitter and power amplifier AGC circuits.
The MAX2057 is pin compatible with the MAX2056
800MHz to 1000MHz VGA, making this family of ampli-
fiers ideal for applications where a common PC board
layout is used for both frequency bands.
The MAX2057 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 paddle. Electrical
performance is guaranteed over the extended -40°C to
+85°C temperature range.
Applications
DCS 1800/PCS 1900 2G and 2.5G EDGE Base-
Station Transmitters and Power Amplifiers
cdmaOne™, cdma2000, Base-Station
Transmitters and Power Amplifiers
UMTS/W-CDMA and Other 3G Base-Station
Transmitters and Power Amplifiers
PHS/PAS 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
cdmaOne is a trademark of CDMA Development Group.
cdma2000 is a registered trademark of Telecommunications
Industry Association.
MAX2057ETX+TD -40°C to +85°C
PART
MAX2057ETX
MAX2057ETX-T
MAX2057ETX+D
Ordering Information
TEMP RANGE
-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 appear at end of data
sheet.
________________________________________________________________
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.
1700MHz to 2500MHz Variable-Gain
Amplifier with Analog Gain Control
MAX2057
ABSOLUTE MAXIMUM RATINGS
V
CC
to GND ...........................................................-0.3V to +5.5V
V
CNTL
to GND (with V
CC
applied) .............................0V 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
R1 = 1.2kΩ, R2 = 2kΩ (Note 1)
R1 = 1.2kΩ (Note 1)
R1 = 2kΩ (Note 1)
(Note 2)
1.0
250
500
CONDITIONS
MIN
4.75
TYP
5
180
1
0.6
4.5
MAX
5.25
230
UNITS
V
mA
mA
mA
V
kΩ
Gain-Control Pin Input Resistance V
CNTL
= 1V to 4.5V
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 = 2kΩ, P
OUT
= +5dBm, f
IN
= 2100MHz, 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
1700
13.5
15.5
+0.9
+0.41
+0.09
-0.16
-1
-0.56
-0.32
+0.1
37
6
+23.8
+64
+37
dB
dB
dBm
dBm
dBm
dB
TYP
MAX
2500
17.5
UNITS
MHz
dB
2
_______________________________________________________________________________________
1700MHz to 2500MHz 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 = 2kΩ, P
OUT
= +5dBm, f
IN
= 2100MHz, 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
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
= 1.7GHz to 2.2GHz,
V
CNTL
= 1V to 4.5V
V
CNTL
= 1.8V to 3.5V
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
One attenuator
Two attenuators
17
34
CONDITIONS
MIN
TYP
-0.83
-0.6
-65
-83
20.7
42.4
-10
-15.2
0.5
500
2.2
18
15
300
20
-70
50
MAX
UNITS
dB
dBc
dBc
dB
dB/V
dB/V
dB
ns
dB
dB
dB
ps
ps
ps
degrees
MAX2057
Note 1:
Total supply current reduces as R
1
and R
2
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
= 2100MHz, f
2
= 2101MHz, +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
1700MHz to 2500MHz Variable-Gain
Amplifier with Analog Gain Control
MAX2057
Typical Operating Characteristics
One Attenuator Configuration
(Typical Application Circuit with
one attenuator
connected, V
CC
= +5.0V, R1 = 1.2kΩ, R2 = 2kΩ, f
IN
= 2100MHz, maximum gain
setting, P
OUT
= +5dBm, linearity measured at P
OUT
= +5dBm/tone, T
A
= +25°C, unless otherwise noted.)
SUPPLY CURRENT
INPUT RETURN LOSS
OUTPUT RETURN LOSS
vs. SUPPLY VOLTAGE
vs. RF FREQUENCY
vs. RF FREQUENCY
MAX2057 toc01
MAX2057 toc02
T
A
= +85°C
190
SUPPLY CURRENT (mA)
5
INPUT RETURN LOSS (dB)
10
15
20
25
30
35
40
T
A
= +25°C
T
A
= -40°C
T
A
= +85°C
5
OUTPUT RETURN LOSS (dB)
10
15
20
25
30
35
40
T
A
= +85°C
T
A
= +25°C
T
A
= -40°C
180
T
A
= +25°C
170
160
T
A
= -40°C
150
4.750
4.875
5.000
5.125
5.250
1500
1700
1900
2100
2300
2500
1500
1700
1900
2100
2300
2500
SUPPLY VOLTAGE (V)
RF FREQUENCY (MHz)
RF FREQUENCY (MHz)
GAIN vs. GAIN-CONTROL VOLTAGE
MAX2057 toc04
GAIN vs. RF FREQUENCY
T
A
= -40°C
17
MAX2057 toc05
REVERSE ISOLATION
vs. RF FREQUENCY
MAX2057 toc06
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
19
40
T
A
= +85°C
REVERSE ISOLATION (dB)
35
T
A
= +25°C
GAIN (dB)
15
T
A
= +25°C
T
A
= +85°C
T
A
= +85°C
13
30
T
A
= -40°C
11
9
4.0
1500
1700
1900
2100
2300
2500
RF FREQUENCY (MHz)
25
1500
1700
1900
2100
2300
2500
RF FREQUENCY (MHz)
INPUT RETURN LOSS
vs. RF FREQUENCY
MAX2057 toc07
OUTPUT RETURN LOSS
vs. RF FREQUENCY
MAX2057 toc08
GAIN vs. RF FREQUENCY
MAXIMUM GAIN
MAX2057 toc09
0
5
INPUT RETURN LOSS (dB)
10
15
20
25
30
35
40
1500
1700
1900
2100
2300
6dB GAIN REDUCTION
3dB GAIN REDUCTION
9dB, 12dB, 15dB, 18dB
GAIN REDUCTION
MAX GAIN
0
5
OUTPUT RETURN LOSS (dB)
10
20
15
10
GAIN (dB)
5
0
-5
-10
18dB GAIN REDUCTION
15
20
25
30
35
40
MAX GAIN, 3dB, 6dB, 9dB, 12dB,
15dB, AND 18dB GAIN REDUCTION
2500
1500
1700
1900
2100
2300
2500
1500
1700
1900
2100
2300
2500
RF FREQUENCY (MHz)
RF FREQUENCY (MHz)
RF FREQUENCY (MHz)
4
_______________________________________________________________________________________
MAX2057 toc03
200
0
0
1700MHz to 2500MHz Variable-Gain
Amplifier with Analog Gain Control
MAX2057
Typical Operating Characteristics (continued)
One Attenuator Configuration
(Typical Application Circuit with
one attenuator
connected, V
CC
= +5.0V, R1 = 1.2kΩ, R2 = 2kΩ, f
IN
= 2100MHz, 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
MAX2057 toc10
NOISE FIGURE vs. RF FREQUENCY
MAX2057 toc11
NOISE FIGURE vs. RF FREQUENCY
7.5
7.0
NOISE FIGURE (dB)
V
CC
= 4.75V
6.5
6.0
5.5
V
CC
= 5.00V
5.0
V
CC
= 5.25V
4.5
4.0
2500
1500
1700
1900
2100
2300
2500
MAX2057 toc12
60
18dB GAIN REDUCTION
55
REVERSE ISOLATION (dB)
50
8.0
7.5
7.0
NOISE FIGURE (dB)
6.5
6.0
5.5
5.0
4.5
4.0
1500
1700
1900
T
A
= -40°C
2100
2300
T
A
= +25°C
T
A
= +85°C
8.0
45
40
35
MAXIMUM GAIN
30
25
20
1500
1700
1900
2100
2300
2500
RF FREQUENCY (MHz)
RF FREQUENCY (MHz)
RF FREQUENCY (MHz)
OUTPUT IP3 vs. RF FREQUENCY
MAX2057 toc13
OUTPUT IP3 vs. RF FREQUENCY
V
CC
= 5.25V
38
OUTPUT IP3 (dBm)
MAX2057 toc14
INPUT IP3 vs. ATTENUATION
MAX2057 toc15
40
T
A
= -40°C
40
41
38
35
32
T
A
= +85°C
29
26
T
A
= -40°C
T
A
= +25°C
38
OUTPUT IP3 (dBm)
36
T
A
= +85°C
T
A
= +25°C
36
V
CC
= 4.75V
V
CC
= 5.00V
34
34
32
32
23
INPUT IP3 (dBm)
30
1500
1700
1900
2100
2300
2500
RF FREQUENCY (MHz)
30
1500
1700
1900
2100
2300
2500
RF FREQUENCY (MHz)
20
0
5
10
ATTENUATION (dB)
15
20
OUTPUT IP3 vs. ATTENUATION
MAX2057 toc16
OUTPUT IP3 vs. OUTPUT POWER
MAX2057 toc17
OUTPUT IP2 vs. RF FREQUENCY
MAX2057 toc18
40
T
A
= +25°C
38
OUTPUT IP3 (dBm)
38
37
OUTPUT IP3 (dBm)
36
35
34
33
32
75
70
OUTPUT IP2 (dBm)
65
60
T
A
= +25°C
55
50
45
T
A
= -40°C
T
A
= +85°C
36
T
A
= +85°C
T
A
= -40°C
34
32
30
0
5
10
ATTENUATION (dB)
15
20
-6
-3
0
3
6
9
12
1500
1700
1900
2100
2300
2500
OUTPUT POWER PER TONE (dBm)
RF FREQUENCY (MHz)
_______________________________________________________________________________________
5
Microchip MCU
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