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What is AD6121?

This electronic component, produced by the manufacturer "Analog Devices", performs the same function as "CDMA 3 V Receiver IF Subsystem with Integrated Voltage Regulator".


AD6121 Datasheet PDF - Analog Devices

Part Number AD6121
Description CDMA 3 V Receiver IF Subsystem with Integrated Voltage Regulator
Manufacturers Analog Devices　
Logo Analog Devices Logo　


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a
CDMA 3 V Receiver IF Subsystem
with Integrated Voltage Regulator
FEATURES
Fully Compliant with IS98A and PCS Specifications
CDMA, W-CDMA, AMPS, and TACS Operation
Linear IF Amplifier
5.9 dB Noise Figure
–47.5 dB to +47 dB Linear-in-dB Gain Control
Quadrature Demodulator
Demodulates IFs from 50 MHz to 350 MHz
Integral Low Dropout Regulator
200 mV Voltage Drop
Accepts 2.9 V to 4.2 V Input from Battery
Low Power
10 mA at Midgain
<1 ␮A Sleep Mode Operation
Companion Transmitter IF Chip Available (AD6122)
APPLICATIONS
CDMA, W-CDMA, AMPS, and TACS Operation
QPSK Receivers
AD6121
GENERAL DESCRIPTION
The AD6121 is a low power receiver IF subsystem specifically
designed for CDMA applications. It consists of high dynamic
range IF amplifiers with voltage controlled gain, a divide-by-two
quadrature generator, an I and Q demodulator, and a power-
down control input. An integral low dropout regulator allows
operation from battery voltages from 2.9 V to 4.2 V.
The gain control input accepts an external gain control voltage
input from a DAC. It provides 94.5 dB of gain control with a
nominal 52.5 dB/V scale factor when using an internal voltage
reference. The gain control interface reference input can be
connected to either the internal reference or an external reference.
The I and Q demodulator provides differential quadrature base-
band outputs to interface with CDMA baseband converters. A
divide-by-two quadrature generator followed by dual polyphase
filters ensures maximum ± 2.5° quadrature accuracy.
The AD6121 IF Subsystem is fabricated using a 25 GHz ft
BiCMOS silicon process and is packaged in a 28-lead SSOP
and a 32-leadless LPCC chip scale package (5 mm × 5 mm).
FUNCTIONAL BLOCK DIAGRAM
ROOFING
FILTER
CDMA
INPUT
FM
INPUT
IF
OUTPUT
DEMODULATOR
INPUT
IF AMPLIFIERS
INPUT STAGE
PTAT
TEMPERATURE
COMPENSATION
I
2
AD6121
Q
QUADRATURE DEMODULATOR
IOUT
IOUT
LOCAL
OSCILLATOR
INPUT
QOUT
QOUT
GAIN CONTROL
SCALE FACTOR
VREG
LOW
DROPOUT
REGULATOR
VPOS
CDMA/FM
SELECT
GAIN
CONTROL
VOLTAGE
INPUT
POWER- POWER-
GAIN
1.23V DOWN 2 DOWN 1
CONTROL REFERENCE
VOLTAGE OUTPUT
REFERENCE
INPUT
REV. B
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.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781/329-4700 World Wide Web Site: http://www.analog.com
Fax: 781/326-8703
© Analog Devices, Inc., 2000

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AD6121 equivalent
Test Figures
AD6121
RF
SOURCE
AD6121
1: 8
110⍀ 10nF
CDMAIPP
IFOPP
10nF 453⍀
4:1
909⍀
110⍀
10nF
1k⍀
10nF 453⍀ 205⍀
TO
SPECTRUM
ANALYZER
CDMAIPN
IFOPN
INDUCTOR CHOSEN FOR PEAK RESPONSE
AT THE TEST FREQUENCY (SEE TEXT)
a. CDMA Input Port Characterization Impedance Match
RF
SOURCE
AD6121
453⍀ 10nF FMIPP
IFOPP
50⍀
10nF
FMIPN
IFOPN
b. FM Input Port Characterization Impedance Match
Figure 1. Quadrature Modulator Characterization Input and Output Impedance Matches
RF
SOURCE
1:4 453⍀ 10nF
DEMIPP
IOPP
205⍀ 453⍀ 10nF
DEMIPN
IOPN
LO
SOURCE
AD6121
QUADRATURE
DEMODULATOR
10nF
LOIPP
10nF
LOIPN
QOPP
QOPN
ALL SIGNAL PATHS MUST BE EQUAL
LENGTHS FOR I/Q MEASUREMENTS
+15V
0.1␮F
X1
X2 V–1
Y1
Y2 V–1
–15V
VP
OUT
A=1
VN AD830
0.1␮F
+15V
0.1␮F
X1
X2 V–1
Y1
Y2 V–1
–15V
VP
OUT
A=1
VN AD830
0.1␮F
50⍀
50⍀
Figure 2. IF Amplifier Characterization Input and Output Impedance Matches
I CHANNEL
Q CHANNEL
R&S
SMT03 RF
SYNC
REFERENCE
R&S
SMT03 RF
SYNC
REFERENCE
R&S
SMT03 RF
REV. B
CDMA
IN
IF OUT
AD6121
FM IN
DEMOD
IN
I CHANNEL
HPE3610
POWER SUPPLY
LO
INPUT Q CHANNEL
DC I/O
HP34970A
DATA ACQUISITION
& SWITCH CONTROL
ALL DC MEASUREMENT
AND CONTROL SIGNALS
Figure 3. General Test Set
–5–
CH1
HP8508A
VECTOR
VOLTMETER
CH2
R&S FSEA
SPECTRUM
RF INPUT ANALYZER
50⍀
TERMINATOR


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Part Details

On this page, you can learn information such as the schematic, equivalent, pinout, replacement, circuit, and manual for AD6121 electronic component.


Information Total 16 Pages
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Featured Datasheets

Part NumberDescriptionMFRS
AD6121The function is CDMA 3 V Receiver IF Subsystem with Integrated Voltage Regulator. Analog DevicesAnalog Devices
AD6122The function is CDMA 3 V Transmitter IF Subsystem with Integrated Voltage Regulator. Analog DevicesAnalog Devices

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