CS4373A

Low-Power, High-Performance, 24-Bit Delta-Sigma Test D/A Converter

Overview

Description

The CS4373A is a high-performance, differential output digital-to-analog converter (DAC) with programmable attenuation and multiple operational modes. AC test modes measure system dynamic performance through THD and CMRR tests while DC test modes are for gain calibration and pulse tests.

The CS4373A is driven by a ΔΣ digital bit stream from the CS5376A digital filter test bit stream (TBS) generator. It has two sets of differential analog outputs, OUT and BUF, to simplify system design as dedicated outputs for testing the electronics channel and for in-circuit sensor tests. Analog output attenuation is selected by simple pin settings and matches the gain of the CS3301/02 differential amplifiers for full-scale testing at all gain ranges.

The CS4373A test DAC provides self-test and precision calibration capability for high-resolution, low-frequency multi-channel measurement systems designed from CS3301/02 differential amplifiers, CS5371/72 ΔΣ modulators and the CS5376A digital filter.

Features

• Digital ΔΣ Input from CS5376A Digital Filter
• Selectable Differential Analog Outputs
• Precision output (OUT±) for electronics tests
• Buffered output (BUF±) for sensor tests
• Multiple AC and DC Operational Modes
• Signal bandwidth: DC to 100 Hz
• Max AC amplitude: 5 V_PP differential
• Max DC amplitude: + 2.5 V_dc differential
• Selectable Attenuation to Match CS3301/02
• 1, 1/2, 1/4, 1/8, 1/16, 1/32, 1/64
• Outstanding Performance
• AC (OUT): -116 dB THD typical, -112 dB max
• AC (BUF): -108 dB THD typical, -95 dB max
• DC absolute accuracy: 0.4% typical, 1% max
• Low Power Consumption
• AC modes / DC modes: 40 mW / 20 mW
• Sleep mode / Power Down: 1 mW / 10 µW
• Extremely Small Footprint
• 28-pin SSOP package, 8 mm x 10 mm
• Bipolar Power Supply Configuration
• VA+ = +2.5 V;VA- = -2.5 V; VD = +3.3 V

Diagram