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FEATURES

Dual, 12-Bit, 40MSPS Current Output DAC

Four 12-Bit Voltage Output DACs—for

Transmit Control

Single +3V Operation

Very Low Power: 29mW

High SFDR: 75dB at fOUT = 5MHz

Low-Current Standby or Full Power-Down

Modes

Internal Reference

Optional External Reference

Adjustable Full-Scale Range: 0.5mA to 2mA

APPLICATIONS

Transmit Channels

? I and Q

? PC Card Modems: GPRS, CDMA

? Wireless Network Cards (NICs)

Signal Synthesis (DDS)

Portable Medical Instumentation

Arbitrary Waveform Generation (AWG)

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 (> 200kΩ) 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 25μW.

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 reference.

The DAC2932 is available in a TQFP-48 package.