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a

FEATURES

Single +5 V Supply

Receive Channel

Differential or Single-Ended Analog Inputs

Auxiliary Set of Analog I & Q Inputs

Two Sigma-Delta A/D Converters

Choice of Two Digital FIR Filters

Root-Raised-Cosine Rx Filters,

偽

= 0.35

Brick Wall FIR Rx Filters

On-Chip or User Rx Offset Calibration

ADC Sampling Vernier

Three Auxiliary DACs

On-Chip Voltage Reference

Low Active Power Dissipation, Typical 45 mW

Low Sleep Mode Power Dissipation, <50

碌W

28-Pin SSOP

APPLICATIONS

American TIA Digital Cellular Telephony

American Analog Cellular Telephony

Digital Baseband Receivers

GENERAL DESCRIPTION

The AD7013 is a complete low power, CMOS, TIA IS-54 base-

band receive port with single +5 V power supply. The part is

CMOS

TIA IS-54 Baseband Receive Port

AD7013

designed to perform the baseband conversion of I and Q

waveforms in accordance with the American (TIA IS-54)

Digital Cellular Telephone system.

The receive path consists of two high performance sigma-delta

ADCs, each followed by a FIR digital filter. A primary and

auxiliary set of IQ differential analog inputs are provided,

where either can be selected as inputs to the sigma-delta

ADCs. Also, a choice of two frequency responses are available

for the receive FIR filters; a Root-Raised-Cosine filter for

digital mode or a brick wall response for analog mode.

Differential analog inputs are provided for both I and Q

channels. On-chip calibration logic is also provided to remove

either on-chip offsets or remove system offsets. A 16-bit serial

interface is provided, interfacing easily to most DSPs. The

receive path also provides a means to vary the sampling

instant, giving a resolution to 1/32 of a symbol interval.

The auxiliary section provides two 8-bit DACs and one 10-bit

DAC for functions such as automatic gain control (AGC),

automatic frequency control (AFC) and power amplifier

control.

As it is a necessity for all digital mobile systems to use the

lowest possible power, the device has receive and auxiliary

power down options. The AD7013 is housed in a space

efficient 28-pin SSOP (Shrink Small Outline Package).

FUNCTIONAL BLOCK DIAGRAM

MCLK

DGND

V

DD

AUX DAC1

AUX DAC2

AUX DAC3

FS ADJUST

V

AA

AGND

DxCLK

DATA IN

FRAME IN

MODE1

FRAME OUT

SERIAL

INTERFACE

10-BIT

AUX DAC

8-BIT

AUX DAC

8-BIT

AUX DAC

FULL-SCALE

ADJUST

AGND

AGND

LATCH

LATCH

LATCH

AD7013

1.23V

REFERENCE

ANALOG MODE

FIR DIGITAL FILTER

ROOT RAISED COSINE

FIR DIGITAL FILTER

BYPASS

IRx

鈭單ｂ€撯垎

MODULATOR

SWITCHED

CAP FILTER

IRx

MUX

AUX IRx

AUX IRx

QRx

OFFSET

ADJUST

ANALOG MODE

FIR DIGITAL FILTER

ROOT RAISED COSINE

FIR DIGITAL FILTER

鈭單ｂ€撯垎

MODULATOR

SWITCHED

CAP FILTER

QRx

MUX

AUX QRx

AUX QRx

Rx CLK

RECEIVE

CHANNEL

SERIAL

INTERFACE

OFFSET

ADJUST

Rx DATA

Rx FRAME

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.

One Technology Way, P.O. Box 9106, Norwood. MA 02062-9106, U.S.A.

Tel: 617/329-4700

Fax: 617/326-8703

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• 7013
  英文版
  CMOS TIA IS-54 Baseband Receive Port
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  7013
• 7013
  英文版
  CMOS TIA IS-54 Baseband Receive Port
  AD [Analog...
  7013

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