AD6630 Analog Devices, AD6630 Datasheet

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AD6630

Manufacturer Part Number
AD6630
Description
Differential/ Low Noise IF Gain Block with Output Clamping
Manufacturer
Analog Devices
Datasheet

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Information furnished by Analog Devices is believed to be accurate and
reliable. However, no responsibility is assumed by Analog Devices for its
use, nor for any infringements of patents or other rights of third parties
which may result from its use. No license is granted by implication or
otherwise under any patent or patent rights of Analog Devices.
PRODUCT DESCRIPTION
The AD6630 is an IF gain block designed to interface between
SAW filters and differential input analog-to-digital converters.
The AD6630 has a fixed gain of 24 dB and has been optimized
for use with the AD6600 and AD6620 in digitizing narrowband
IF carriers in the 70 MHz to 250 MHz range.
Taking advantage of the differential nature of SAW filters, the
AD6630 has been designed as a differential in/differential out
gain block. This architecture allows 100 dB of adjacent channel
blocking using low cost SAW filters. The AD6630 provides
output limiting for ADC and SAW protection with 10 phase
variation in recovery from overdrive situations.
Designed for “narrow-band” cellular/PCS receivers, the high
linearity and low noise performance of the AD6630 allows for
implementation in a wide range of applications ranging from
FEATURES
24 dB Gain
4 dB Noise Figure
Easy Match to SAW Filters
Output Limiter Adjustable +8.5 dBm to +12 dBm
700 MHz Bandwidth
10 V Single or Dual 5 V Power Supply
300 mW Power Dissipation
APPLICATIONS
ADC IF Drive Amp
Communications Receivers
PCS/Cellular Base Stations
GSM, CDMA, TDMA
OSCILLATOR
LOCAL
Figure 1. Reference Design
AD6630
AD6630
GSM to CDMA to AMPS. The clamping circuitry also main-
tains the phase integrity of an overdriven signal. This allows
phase demodulation of single carrier signals with an overrange
signal.
While the AD6630 is optimized for use with the AD6600 Dual
Channel, Gain Ranging ADC with RSSI, it can also be used in
many other IF applications. The AD6630 is designed with an
input impedance of 200
cal application shown below, these values match the real portion
of a typical SAW filter. Other devices can be matched using
standard matching network techniques.
The AD6630 is built using Analog Devices’ high speed comple-
mentary bipolar process. Units are available in a 300 mil SOIC
(16 leads) plastic surface mount package and specified to operate
over the industrial temperature range (–40 C to +85 C).
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781/329-4700
Fax: 781/326-8703
Differential, Low Noise IF Gain
Block with Output Clamping
DIVERSITY
MAIN
FUNCTIONAL BLOCK DIAGRAM
AD6600
CLLO
CLHI
IP2
IP1
IP1
IP2
NC
NC
World Wide Web Site: http://www.analog.com
1
2
3
4
5
6
7
8
AD6620
AD6620
NC = NO CONNECT
and an output of 400 . In the typi-
AD6630
+
+
+
DSP
© Analog Devices, Inc., 1998
16
15
14
13
12
11
10
9
V
CD1
OP
V
CMD
OP
CD2
V
CC
EE
CC
AD6630

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AD6630 Summary of contents

Page 1

... The AD6630 gain block designed to interface between SAW filters and differential input analog-to-digital converters. The AD6630 has a fixed gain and has been optimized for use with the AD6600 and AD6620 in digitizing narrowband IF carriers in the 70 MHz to 250 MHz range. ...

Page 2

... AD6630–SPECIFICATIONS NORMAL OPERATING CONDITIONS Parameter (Conditions) SINGLE SUPPLY VOLTAGE POSITIVE SUPPLY VOLTAGE NEGATIVE SUPPLY VOLTAGE AMBIENT TEMPERATURE PACKAGE THERMAL RESISTANCE 1 OPERATING FREQUENCY (T = – MIN DC SPECIFICATIONS Inputs should be AC coupled.) Parameter SUPPLY CURRENT OUTPUT DC LEVEL (T = – MIN AC SPECIFICATIONS performance limits are correlated to 5 MHz testing based on characterization data.) ...

Page 3

... ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily accumulate on the human body and test equipment and can discharge without detection. Although the AD6630 features proprietary ESD protection circuitry, permanent damage may occur on devices subjected to high energy electrostatic discharges. Therefore, proper ESD precautions are recommended to avoid performance degradation or loss of functionality ...

Page 4

... Figure Compression Point (Typical 300 70 –4– PIN CONFIGURATION CD1 2 15 IP2 AD6630 IP1 TOP VIEW IP1 5 12 CMD (Not to Scale) IP2 CLLO 7 10 CD2 CLHI CONNECT ...

Page 5

... Similarly, the output clamp level cannot be set higher than 12 dBm. Matching SAW Filters The AD6630 is designed to easily match to SAW filters. SAW filters are largely capacitive in nature. Normally a conjugate match to the load is desired for maximum power transfer. ...

Page 6

... OP O C100 0.1 F IP1 IP1B CMD C101 V O 0.1 F IP2B OPB GND CL1 CD2 CL2 AD6630 Figure 12. Reference Design Component Placement (Two Channels Shown) OUTPUT AMP + OUTPUT AMP TO OUTPUT AMPLIFIER – –6– +10V SAW2 ...

Page 7

... R3 R1 200 TP1 1 AGND TEST P C10 100nF C2 10nF 8-1 AT224 C3 10nF TP2 1 C4 TEST P 100nF R2 200 AGND AGND 24.1 –8.8 394.3 –8.6 23.5 –22.5 382.4 –21.9 23.2 –26.4 353.0 –25.4 22.9 –38.9 328.9 –29.2 AD6630 J8 1 SMA 2 AGND ...

Page 8

... AD6630 0.0118 (0.30) 0.0040 (0.10) OUTLINE DIMENSIONS Dimensions shown in inches and (mm). 16-Lead Wide Body SOIC (R-16) 0.4133 (10.50) 0.3977 (10.00 0.1043 (2.65) PIN 1 0.0291 (0.74) 0.0926 (2.35) 0.0098 (0.25) 0.0500 (1.27) 8 0.0500 0.0192 (0.49) 0.0157 (0.40) 0 SEATING 0.0125 (0.32) (1.27) 0.0138 (0.35) PLANE BSC 0.0091 (0.23) –8– REV. 0 ...

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