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參數(shù)資料
| 型號： | AD7015 |
| 廠商： | Analog Devices, Inc. |
| 元件分類： | Codec |
| 英文描述： | Complete 3 V GSM/DCS1800 Codec(GSM/DCS1800 編碼譯碼器) |
| 中文描述： | 完成3伏GSM/DCS1800編解碼器（GSM/DCS1800編碼譯碼器） |
| 文件頁數(shù)： | 1/1頁 |
| 文件大小： | 21K |
| 代理商： | AD7015 |
REV. A
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.
a
AD7015
Analog Devices, Inc., 1996
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 617/329-4700
Fax: 617/326-8703
FEATURES
+2.7 V to +5.5 V Supply Voltage
Baseband Codec
Baseband Serial Port (BSPORT)
Differential IRx, QRx, ITx and QTx
Transmit Channel
On-Chip Burst Store
On-Chip GMSK Modulator
Two 10-Bit D/A Converters
Analog Reconstruction Filters
On-Chip Offset Calibration
Power-Down Mode
Receive Channel
Two 15-Bit Sigma-Delta A/D Converters
FIR Digital Filters
62 dB SNR and THD
Twos Complement Coding
On-Chip Offset Calibration
Power-Down Mode
Auxiliary D/A Converters
Auxiliary A/D Converter
Auxiliary Serial Port (ASPORT)
On-Chip Ramp-Up/Ramp-Down Envelope RAM
Voiceband Codec
Complete Linear Coded Codec
16-Bit Sigma-Delta A/D Converter
16-Bit Sigma-Delta D/A Converter
On-Chip Antialiasing and Anti-Imaging Filters
8 kHz Sampling Rate
Twos Complement Coding
62.5 dB SNR and THD
Programmable Gain on DAC and ADC
Voiceband Serial Port (VSPORT)
Full DAI Support
Power-Down Mode
On-Chip Voltage References
Low Power
Multiple 3 V/5 V Operating Modes
80-Pin TQFP
APPLICATIONS
GSM
DCS1800
GE NE RAL DE SCRIPT ION
T he AD7015 is a monolithic 3 V/5 V CMOS combined
voiceband codec/baseband codec for use in GSM mobile
telephones. T he chip performs all the data conversion functions
needed in a GSM mobile cellular system and DCS1800
networks.
T he baseband codec is a complete low power, two-channel,
input/output port with signal conditioning. T his section is
utilized as a baseband digitization subsystem performing signal
conversion between the DSP and the IF/RF sections in the
Pan-European telephone system (GSM) and DCS1800 networks.
T he transmit path consists of an on-board ROM, containing all
the code necessary for performing Gaussian Minimum Shift
K eying (GMSK ) and two high accuracy, fast DACs with output
reconstruction filters. T he receive path is composed of two high
performance sigma-delta ADCs with digital filtering. A common
bandgap reference feeds the ADCs and signal DACs. T he
baseband functions of the AD7015 can be accessed via the
baseband serial port (BSPORT ) or the auxiliary serial port
(ASPORT ).
T he voiceband codec is a complete analog front-end for high
performance voiceband and DSP applications. T he voiceband
codec’s linear-coded DAC and ADC maintain wide dynamic
range throughout the transfer function while maintaining far
superior SNR and T HD in comparison to traditional
μ
-law and
A-law codecs. It includes on-chip antialiasing and anti-imaging
filters, 16-bit ADC, 16-bit DAC and programmable gain
amplifiers. A serial I/O port (VSPORT ) allows easy interfacing
to industry standard DSP processors. Data transfers between
the DSP and the AD7015 are 16 bits wide. T he AD7015
VSPORT also supports the GSM Digital Audio Interface (DAI)
standard where 13-bit transfers are used. T he voiceband codec
can be controlled using any of the three SPORT s.
T hree control DACs are included for such functions as AFC,
AGC and RF power control signals. A three channel ADC
completes the available auxiliary converter functions. T he
auxiliary functions can be accessed via the auxiliary port
(ASPORT ) or the baseband port (BSPORT ).
As it is a necessity for all GSM and DCS1800 mobile systems to
use the lowest power possible, the device has power-down or
sleep options for all sections. By setting appropriate bits in the
on-chip control registers, power consumption can be reduced to
a minimum.
T he AD7015 is housed in an 80-pin T QFP.
See Page 38 for T able of C ontents.
Complete 3 V
GSMDCS1800 Codec
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