High-performance Delta-Sigma Test DAC - Cirrus Logic
Description
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CS4373 Low-power, High-performance ∆Σ Test DAC
Features
• Digital ∆Σ Input, Differential Analog Output • Selectable Differential Outputs (OUT±, BUF±) • Selectable Output Attenuation
- 1, 1/2, 1/4, 1/8, 1/16, 1/32, 1/64
Description
The CS4373 is a differential output digital-toanalog converter intended for high-resolution, low-frequency measurement systems.
It is designed to work with the CS5376A and CS5378 digital filters, the CS3301 and CS3302 high-precision amplifiers, and the CS5371 or CS5372 high-performance ∆Σ modulators.
The CS4373 includes a set of multiplexed outputs which provide a precision output (OUT±) for testing the electronics channel and a buffered output (BUF±) for in-circuit sensor tests.
It is driven by a ∆Σ bitstream and the maximum analog output is differential 5 volts peak-to-peak.
Distortion performance of the DAC is typically -118 dB THD from the precision output, and -100 dB THD from the buffered output.
Noise performance is 114 dB SNR over a 430 Hz bandwidth.
The CS4373 has very low power consumption.
In normal mode (LPWR=0; MCLK=2.
048 MHz), power consumption is 40 mW; while in Low Power mode (LPWR=1; MCLK=1.
024 MHz), power consumption is 25 mW.
ORDERING INFORMATION See page 19.
• User-programmable Test Modes
- Differential - Common mode
• Output Voltage: 5 VP-P Differential • Outstanding Noise Performance
- 114 dB SNR @ 430 Hz bandwidth
• Low Total Harmonic Distortion
- OUT±: -118 dB THD typical, -112 dB THD max - BUF±: -100 dB THD typical, -95 dB THD max
• Low Power Consumption
Normal mode: 7.
8 mA Low power mode: 5.
0 mA Power down: 400 µA Sleep mode: 2 µA
• Power Supply Options
- VA+ = +5 V; VA- = 0 V; VD = +3.
3 V to +5 V - VA+ = +2.
5 V; VA- = -2.
5 V; VD = +3.
3 V
VA+
MODE(0, 1, 2)
ATT(0, 1, 2)
VD
TDATA
Attenuator
OUT+ OUTBUF+ BUFCAP+ CAP-
24-bit ∆Σ DAC
LPWR
MCLK SYNC
Clock Generator
VA-
VREF+
VREF-
DGND
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cirrus.
com
Copyright © Cirrus Logic, Inc.
2005 (All Rights Reserved)
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