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sigma-delta DAC

High resolution, high bandwidth

The SDCRDAC24bHBW is a 24-bit sigma-delta charge-redistribution digital-to-analog converter (DAC). It is designed to have high absolute accuracy, low noise and low power consumption, and it is robust against temperature variations. This makes the DAC ideally suited for high-performance audio as well as demanding control applications in a wide variety of environments.

The product is based on the SDCRDAC24b, but this version is not radiation-hardened. Instead, the SDCRDAC24bHBW has increased bandwidth, increased temperature stability, and lower power consumption.

The functional block diagram is shown below.

Features

Noise floor: <-139 dBV (10 μHz – 1 Hz)
Noise floor: -138 dBV (1 Hz – 50 Hz)
Noise floor: -113 dBV (20 Hz – 20 kHz)
Noise floor: -83 dBV (20 Hz – 1 MHz)
Input sample rate: 0-6 MS/s
Total out-of-band noise: < -64 dB, without filtering
Low latency (down to 9 clock cycles): ideal for closed loop applications
Wide common mode range
Quasi-differential outputs
Outputs suitable for both current-mode and voltage-mode operation
Total power consumption: 1.5 mW (fclk=6 MHz; power scales linearly with fclk)
Gain stability versus < temperature: <2 ppm/K
Low offset: < 3 μV
Offset stability vs temperature: < 30 nV/K
No code dependent loading of Vref
Technology: UMC 0.18 μm CMOS
Design is scalable with regard to area and performance

Applications

High-precision control systems
Automatic test equipment
Gain and offset adjustment/calibration
Programmable voltage and current sources
Process and servo control
High-quality audio
Active noise reduction systems

Downloads

SDCRDAC24bHBW Datasheet

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