SBAS279C − AUGUST 2003 − REVISED OCTOBER 2004

Dual, 12Bit, 40MSPS

DigitaltoAnalog Converter

DAC2932

FEATURES

Transmit Control

Modes

APPLICATIONS

− I and Q

− PC Card Modems: GPRS, CDMA

− Wireless Network Cards (NICs)

DESCRIPTION

The

DAC2932

is

a

dual

12-bit,

current-output

digital-to-analog converter (DAC) designed to combine the

features of high dynamic range and very low power

consumption. The DAC2932 converter supports update

rates of up to 40MSPS. In addition, the DAC2932 features

four 12-bit voltage output DACs, which can be used to

perform system control functions.

The advanced segmentation architecture of the DAC2932

is optimized to provide a high spurious-free dynamic range

(SFDR).

The DAC2932 has a high impedance (> 200k

Ω) differential

current output with a nominal range of 2mA and a

compliance voltage of up to 0.8V. The differential outputs

allow for either a differential or single-ended analog signal

interface. The close matching of the current outputs

ensures superior dynamic performance in the differential

configuration,

which

can

be

implemented

with

a

transformer. Using a small geometry CMOS process, the

monolithic DAC2932 is designed to operate within a

single-supply range of 2.7V to 3.3V. Low power

consumption

makes

it

ideal

for

portable

and

battery-operated

systems.

Further

optimization

by

lowering the output current can be realized with the

adjustable full-scale option. The full-scale output current

can be adjusted over a span of 0.5mA to 2mA.

For noncontinuous operation of the DAC2932, a full

power-down mode can reduce the power dissipation to as

little as 25

µW.

The DAC2932 is designed to operate with a single parallel

data port. While it alternates the loading of the input data

into separate input latches for both current output DACs

(I-DACs), the updating of the analog output signal occurs

simultaneously. The DAC2932 integrates a temperature

compensated 1.22V bandgap reference. The DAC2932

also allows for additional flexibility of using an external ref-

erence.

The DAC2932 is available in a TQFP-48 package.

PRODUCTION DATA information is current as of publication date. Products

conform to specifications per the terms of Texas Instruments standard warranty.

Production processing does not necessarily include testing of all parameters.

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 2003−2004, Texas Instruments Incorporated

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