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PDF MAX3537 Data sheet ( Hoja de datos )
| Número de pieza | MAX3537 | |
| Descripción | (MAX3537 / MAX3538) Broadband Variable Gain Amplifiers | |
| Fabricantes | Maxim Integrated Products | |
| Logotipo |  |
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19-3445; Rev 1; 6/05
EVAALVUAAILTAIOBNLEKIT
Broadband Variable-Gain Amplifiers
General Description
The MAX3537/MAX3538 broadband RF variable-gain
amplifiers (VGA) are designed for digital and
OpenCable™ set-tops and televisions. These devices
feature a unique design that integrates a dual-band
(UHF and VHF) input and a low-noise, variable-gain
amplifier. The integrated RF VGA covers a 10MHz to
1GHz input frequency range and provides 22dB of
gain-control range.
The MAX3538 is intended for the most difficult signal
conditions where performance is critical. The external
pullup inductor improves IIP2 and IIP3 while also
increasing gain for better sensitivity. The MAX3537
does not need an external pullup inductor and is ideal
for low-power applications with less demanding receiv-
er distortion requirements such as smaller TVs using
indoor antennas.
The MAX3537/MAX3538 are specified for operation in
the 0°C to +85°C temperature range and are available
in 4mm x 4mm, 12-pin thin QFN packages with
exposed paddle (EP).
Applications
OpenCable Set-Top Boxes and Televisions
Digital Set-Top Boxes
Media Gateways
Digital Terrestrial Receivers
TV IF Strips
OpenCable is a trademark of Cable Television Laboratories, Inc.
Features
o Low-Noise VGA Eliminates PIN Attenuator
o 22dB Gain-Control Range
o Low Noise Figure: 5dB at Maximum Gain Setting
o High Linearity: +19dBm IIP3 (MAX3538) at
Maximum Gain Setting
o Low Power Consumption: <200mW (MAX3537)
o Available in a 4mm x 4mm, 12-Pin Thin QFN
Package
Ordering Information
PART
TEMP
RANGE
PIN-PACKAGE
MAX3537UTC 0°C to +85°C 12 Thin QFN-EP*
MAX3537UTC+ 0°C to +85°C 12 Thin QFN-EP*
MAX3538UTC 0°C to +85°C 12 Thin QFN-EP*
MAX3538UTC+ 0°C to +85°C 12 Thin QFN-EP*
*EP = Exposed paddle.
+Denotes lead-free package.
PKG
CODE
T1244-3
T1244-3
T1244-3
T1244-3
Pin Configuration/
Functional Diagram
12 11 10
UHF_IN 1
RF_GND1 2
UHF_SHUNT 3
MAX3537/3538
9 LNAOUT
8 VCC
7 RFAGC
4 56
________________________________________________________________ Maxim Integrated Products 1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
www.DataSheet4U.com1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
1 page  
Broadband Variable-Gain Amplifiers
Typical Operating Characteristics (continued)
(MAX3537 EV kit with diplex filter removed, VCC = 5V, VRFAGC = 3V, TA = +25°C, unless otherwise noted.)
MAX3537
SUPPLY CURRENT AND IIP3 vs. RBIAS
45 25
43 23
41
39 CURRENT
37
21
19
IIP3
17
35 15
33 13
31 11
29 f1 = 400MHz
27
f2 = 450MHz
PIN = -12dBm/tone
25
11.8 12.6 13.4
RBIAS (kΩ)
14.2
9
7
5
15.0
GAIN vs. RBIAS
16
fRF = 400MHz
14
12
10
8
6
4
2
0
11.8
12.6 13.4 14.2
RBIAS (kΩ)
-20.00
-25.00
SHUTDOWN ISOLATION
vs. FREQUENCY
WITH DIPLEXER
-30.00
-35.00
-40.00
-45.00
-50.00
-55.00
-60.00
-65.00
-70.00
15.0 10 120 230 340 450 560 670 780 890 1000
FREQUENCY (MHz)
Typical Operating Characteristics
(MAX3538 EV kit with diplex filter removed, VCC = 5V, VRFAGC = 3V, TA = +25°C, unless otherwise noted.)
SUPPLY CURRENT
vs. SUPPLY VOLTAGE
56
54 TA = 0°C
52 TA = +25°C
50 TA = +85°C
48
46
44
42
40
4.7
4.8 4.9 5.0 5.1 5.2
SUPPLY VOLTAGE (V)
5.3
MAX3538
GAIN vs. FREQUENCY
16
15
14
13
12
11 TA = +85°C
10 TA = +25°C TA = 0°C
9
8
7
6
10 120 230 340 450 560 670 780 890 1000
FREQUENCY (MHz)
GAIN vs. GAIN-CONTROL VOLTAGE
15
10
fRF = 878MHz
5
0
-5 fRF = 50MHz
-10
-15
1.0 1.2 1.4 1.6 1.8 2.0 2.2 2.4 2.6 2.8 3.0
VRFAGC (V)
_______________________________________________________________________________________ 5
www.DataSheet4U.com
5 Page 
Broadband Variable-Gain Amplifiers
Package Information (continued)
(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information,
go to www.maxim-ic.com/packages.)
PACKAGE OUTLINE,
12, 16, 20, 24, 28L THIN QFN, 4x4x0.8mm
21-0139
D
2
2
Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are
implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.
Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 ____________________ 11
© 2005 Maxim Integrated Products
Printed USA
is a registered trademark of Maxim Integrated Products, Inc.
www.DataSheet4U.com
11 Page | ||
| Páginas | Total 11 Páginas | |
| PDF Descargar | [ Datasheet MAX3537.PDF ] | |
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