AD7002AS Analog Devices, AD7002AS Datasheet

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AD7002AS

Manufacturer Part Number
AD7002AS
Description
GSM baseband I/O port
Manufacturer
Analog Devices
Datasheet

Specifications of AD7002AS

Dc
0225
Case
QFP

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a
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.
FEATURES
Single +5 V Supply
Transmit Channel
Receive Channel
3 Auxiliary D/A Converters
Power-Down Modes
On-Chip Voltage Reference
Low Power
44-Lead PQFP
APPLICATIONS
GSM
PCN
On-Chip GMSK Modulator
Two 10-Bit D/A Converters
Analog Reconstruction Filters
Power-Down Mode
Two Sigma-Delta A/D Converters
FIR Digital Filters
On-Chip Offset Calibration
Power-Down Mode
Rx DATA (I DATA)
THREE-STATE
I/Q (Q DATA)
AUX LATCH
Rx SLEEP1
Rx SLEEP2
AUX DATA
Tx SLEEP
Rx SYNC
AUX CLK
Tx DATA
ENABLE
Rx CLK
Tx CLK
MODE
RATE
9-BIT DAC
DAC 1
AUX
16-BIT SHIFT REGISTER
SHAPING ROM
GMSK PULSE
INTERFACE
CHANNEL
RECEIVE
10-BIT DAC
SERIAL
DAC 2
AUX
DV
DD
FUNCTIONAL BLOCK DIAGRAM
DGND
8-BIT DAC
DAC 3
AUX
10-BIT DAC
10-BIT DAC
FLAG
AUX
DIGITAL FIR FILTER
DIGITAL FIR FILTER
OFFSET REGISTER
OFFSET REGISTER
CAL
GENERAL DESCRIPTION
The AD7002 is a complete low power, two-channel, input/
output port with signal conditioning. The device is used as a
baseband digitization subsystem, performing signal conversion
between the DSP and the IF/RF sections in the Pan-European
telephone system (GSM).
The transmit path consists of an onboard digital modulator,
containing all the code necessary for performing Gaussian Mini-
mum Shift Keying (GMSK), two high accuracy, fast DACs with
output reconstruction filters. The receive path is composed of
two high performance sigma-delta ADCs with digital filtering. A
common bandgap reference feeds the ADCs and signal DACs.
Three control DACs (AUX DAC1 to AUX DAC3) are in-
cluded for such functions as AFC, AGC and carrier signal shap-
ing. In addition, AUX FLAG may be used for routing digital
control information through the device to the IF/RF sections.
As it is a necessity for all GSM mobile systems to use the lowest
power possible, the device has power-down or sleep options for
all sections (transmit, receive and auxiliary).
The AD7002 is housed in 44-lead PQFP (Plastic Quad Flatpack).
Q CHANNEL
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 617/329-4700
Fax: 617/326-8703
I CHANNEL
REFERENCE
2.5V
CLK2
AV
DD
AGND
4TH ORDER BESSEL
4TH ORDER BESSEL
LOW-PASS FILTER
LOW-PASS FILTER
GSM Baseband I/O Port
CLK1
MODULATOR
MODULATOR
World Wide Web Site: http://www.analog.com
MZERO
OUTPUT BUFFER
SWITCH-CAP
SWITCH-CAP
REFERENCE
FILTER
FILTER
AD7002
© Analog Devices, Inc., 1997
AD7002
LC
I Tx
Q Tx
REF OUT
Q Rx
I Rx
2
MOS

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AD7002AS Summary of contents

Page 1

... Rx SLEEP2 AUX DAC 1 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. ...

Page 2

AD7002–SPECIFICATIONS Parameter ADC SPECIFICATIONS Resolution Signal Input Span Sampling Rate Output Word Rate Accuracy Integral 2 Differential Bias Offset Error Input Resistance (DC) Input Capacitance Dynamic Specifications Dynamic Range Signal to (Noise+Distortion) Gain Error Gain Match Between Channels Filter Settling ...

Page 3

Parameter AUXILIARY DAC SPECIFICATIONS Resolution DC Accuracy Integral Differential Offset Error Gain Error LSB Size Output Signal Span Output Impedance Coding Power-Down REFERENCE SPECIFICATIONS REFOUT, Reference Output REFOUT, Reference Output @ +25 C Reference Temperature Coefficient 4 Reference Variation Output ...

Page 4

... Package Model Range Description AD7002AS – +85 C Plastic Quad Flatpack S-44 CAUTION 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 AD7002 features proprietary ESD protection circuitry, permanent damage may occur on devices subjected to high energy electrostatic discharges ...

Page 5

GMSK Phase Trajectory Error This is a measure of the phase error between the transmitted phase of an ideal GMSK modulator and the actual phase trans- mitted by the AD7002, when transmitting a random sequence of data bits ...

Page 6

AD7002 1 INPUT CLOCK TIMING (AV DD Limit at Parameter T = – + TRANSMIT SECTION TIMING Limit at Parameter T = – +85 C ...

Page 7

RECEIVE SECTION TIMING Limit at Parameter T = – + ...

Page 8

AD7002 CIRCUIT DESCRIPTION TRANSMIT SECTION The transmit section of the AD7002 generates GMSK I and Q waveforms in accordance with GSM recommendation 5.04. This is accomplished by a digital GMSK modulator, followed by 10-bit DACs for the I and Q ...

Page 9

FREQUENCY – Hz Figure 5. Transmit Filter Frequency Response GMSK SPECTRUM TEST 6.4MHz. FREQUENCY RESOLUTION: 30.1514kHz ...

Page 10

AD7002 RECEIVE SECTION The receive section consists of I and Q receive channels, each comprised of a simple switched capacitor filter followed by a 12-bit sigma-delta ADC. The data is available on a flexible serial interface, interfacing easily to most ...

Page 11

The analog modulator, on coming out of sleep, will generate mean- ingful data after 21 master clock cycles. 01...111 01...110 00...001 00...000 11...111 11...110 10...001 10...000 –V V FULLSCALE REF ...

Page 12

AD7002 The offset registers have enough resolution to hold the value of any dc offset between 5 V. However, the performance of the sigma-delta modulators will degrade if full scale signals with more than 100 mV of offset are experienced. ...

Page 13

CLK1, CLK2 ( SLEEP1 (I) Rx SLEEP2 ( CLK ( SYNC ( DATA ( I/Q (O) NOTE: (I) = DIGITAL INPUT; (O) = DIGITAL ...

Page 14

AD7002 CLK1, CLK2 ( SLEEP1 (I) Rx SLEEP2 ( CLK ( SYNC (O) I DATA ( DATA (O) NOTE: (I) = DIGITAL INPUT; (O) = DIGITAL OUTPUT ...

Page 15

VOLTAGE REFERENCE The AD7002 contains an on-chip bandgap reference that pro- vides a low noise, temperature compensated reference to the IQ transmit DACs and the IQ receive ADCs. The reference is also made available on the REFOUT pin and can ...

Page 16

AD7002 PQFP Pin Number Mnemonic Function 19 I/Q (QDATA) This is a dual function digital output. When the device is operating in MODE 0, it indicates whether IDATA or QDATA is present on Rx DATA pin. In MODE 1, QDATA ...

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