FEATURES
SINGLE +5V OR +3V OPERATION
HIGH SFDR: 5.04MHz Output at 100MSPS: 67dBc
LOW GLITCH: 3pV-s
LOW POWER: 170mW at +5V
INTERNAL REFERENCE:
Optional Ext. Reference
Adjustable Full-Scale Range
Multiplying Option

APPLICATIONS
MEDICAL INSTRUMENTATION
Ultrasound (DBF)
VIDEO, DIGITAL TV
WAVEFORM GENERATION
Direct Digital Synthesis (DDS)
Arbitrary Waveform Generation (ARB)
TEST INSTRUMENTATION
COMMUNICATIONS

DESCRIPTION
The DAC908 is a high-speed, Digital-to-Analog Converter (DAC)
offering an 8-bit resolution option within the SpeedPlus family of
high-performance converters. Featuring pin compatibility among
family members, the DAC900, DAC902, and DAC904 provide a
component selection option to an 10-, 12-, and 14-bit resolution,
respectively. All models within this family of DACs support update
rates in excess of 165MSPS with excellent dynamic performance,
and are especially suited to fulfill the demands of a variety of
applications.
The advanced segmentation architecture of the DAC908 is optimized
to provide a high Spurious-Free Dynamic Range (SFDR) for
single-tone, as well as for multi-tone signals—essential when used
for the transmit signal path of communication systems.
The DAC908 has a high impedance (200kΩ) current output with a
nominal range of 20mA and an output compliance of up to 1.25V.
The differential outputs allow for both a differential or singleended
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.
Utilizing a small geometry CMOS process, the monolithic DAC908
can be operated on a wide, single-supply range of +2.7V to +5.5V.
Its low power consumption allows for use in portable and batteryoperated
systems. Further optimization can be realized by lowering
the output current with the adjustable full-scale option.
For noncontinuous operation of the DAC908, a power-down mode
results in only 45mW of standby power.
The DAC908 comes with an integrated 1.24V bandgap reference
and edge-triggered input latches, offering a complete converter
solution. Both +3V and +5V CMOS logic families can be interfaced
to the DAC908.
The reference structure of the DAC908 allows for additional
flexibility by utilizing the on-chip reference, or applying an external
reference. The full-scale output current can be adjusted over a
span of 2mA to 20mA, with one external resistor, while maintaining
the specified dynamic performance.
The DAC908 is available in the SO-28 and TSSOP-28 packages.