AD7013_15 Datasheet, PDF (1/20 Pages) Analog Devices – CMOS TIA IS-54 Baseband Receive Port

a
CMOS
TIA IS-54 Baseband Receive Port
AD7013
FEATURES
designed to perform the baseband conversion of I and Q
Single +5 V Supply
waveforms in accordance with the American (TIA IS-54)
Receive Channel
Digital Cellular Telephone system.
Differential or Single-Ended Analog Inputs
The receive path consists of two high performance sigma-delta
Auxiliary Set of Analog I & Q Inputs
ADCs, each followed by a FIR digital filter. A primary and
Two Sigma-Delta A/D Converters
auxiliary set of IQ differential analog inputs are provided,
Choice of Two Digital FIR Filters
where either can be selected as inputs to the sigma-delta
Root-Raised-Cosine Rx Filters, α = 0.35
ADCs. Also, a choice of two frequency responses are available
Brick Wall FIR Rx Filters
for the receive FIR filters; a Root-Raised-Cosine filter for
On-Chip or User Rx Offset Calibration
digital mode or a brick wall response for analog mode.
OBSOLETE ADC Sampling Vernier
Three Auxiliary DACs
On-Chip Voltage Reference
Low Active Power Dissipation, Typical 45 mW
Low Sleep Mode Power Dissipation, <50 µW
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
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
Rx CLK
Rx DATA
Rx FRAME
SERIAL
INTERFACE
RECEIVE
CHANNEL
SERIAL
INTERFACE
10-BIT
AUX DAC
8-BIT
AUX DAC
8-BIT
AUX DAC
FULL-SCALE
ADJUST
LATCH
LATCH
OFFSET
ADJUST
ANALOG MODE
FIR DIGITAL FILTER
ROOT RAISED COSINE
FIR DIGITAL FILTER
LATCH
1.23V
REFERENCE
AD7013
∆Σ–∆
MODULATOR
SWITCHED
CAP FILTER
MUX
OFFSET
ADJUST
ANALOG MODE
FIR DIGITAL FILTER
ROOT RAISED COSINE
FIR DIGITAL FILTER
∆Σ–∆
MODULATOR
SWITCHED
CAP FILTER
MUX
AGND
AGND
BYPASS
IRx
IRx
AUX IRx
AUX IRx
QRx
QRx
AUX QRx
AUX QRx
REV. A
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