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CS4373A

Low-power, High-performance

∆Σ

Test DAC

Features

z Digital ∆Σ Input from CS5376A Digital Filter

z Selectable Differential Analog Outputs

• Precision output (OUT±) for electronics tests

• Buffered output (

BUF±) for sensor tests

z Multiple AC and DC Operational Modes

• Signal bandwidth: DC to 100 Hz

• Max AC amplitude: 5 V

differential

• Max DC amplitude: + 2.5 V

differential

z Selectable Attenuation for CS3301A / CS3302A

• 1, 1/2, 1/4, 1/8, 1/16, 1/32, 1/64

z Outstanding Performance

• AC (OUT): -116 dB THD typical, -112 dB max

• AC (BUF): -108 dB THD typical, -90 dB max

• DC absolute accuracy: 0.4% typical, 1% max

z Low Power Consumption

• AC modes / DC modes: 40 mW / 20 mW

• Sleep mode / Power Down: 1 mW / 10 µW

z Extremely Small Footprint

• 28-pin SSOP package, 8 mm x 10 mm

z Bipolar Power Supply Configuration

• VA+ = +2.5 V;VA- = -2.5 V;VD = +3.3 V

Description

The CS4373A is a high-performance, differential output

digital-to-analog converter (DAC) with programmable at-

tenuation 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 ∆Σ 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

CS3301A / CS3302A 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

CS3301A / CS3302A differential amplifiers,

CS5371A / CS5372A ∆Σ modulators and the CS5376A

digital filter.

ORDERING INFORMATION

See page 34.

24-Bit ∆Σ

DAC

Attenuator

Clock

Generator

TDATA

VA+ MODE(0, 1, 2) ATT(0, 1, 2) VD

VA-

VREF+

VREF-

GND

OUT+

OUT-

BUF+

BUF-

CAP+ CAP-

MCLK

MSYNC

DEC ‘06

DS699F2

CS4373A

2 DS699F2

TABLE OF CONTENTS

1. CHARACTERISTICS AND SPECIFICATIONS ........................................................................ 4

2. GENERAL DESCRIPTION ..................................................................................................... 16

2.1 Digital Inputs .................................................................................................................... 16

2.2 Analog Outputs ................................................................................................................ 16

2.3 Multiple Operational Modes ............................................................................................. 16

2.4 Low Power .......................................................................................................................16

3. SYSTEM DIAGRAMS ..........................................................................................................17

4. POWER MODES .....................................................................................................................18

4.1 Power Down .....................................................................................................................18

4.2 Sleep Modes .................................................................................................................... 18

4.3 AC Test Modes ................................................................................................................ 18

4.4 DC Test Modes ................................................................................................................ 18

5. OPERATIONAL MODES ........................................................................................................ 19

5.1 Sleep Modes .................................................................................................................... 19

5.2 AC Test Modes ................................................................................................................ 19

5.2.1 AC Differential ..................................................................................................... 19

5.2.2 AC Common Mode .............................................................................................. 20

5.2.3 AC Stability .......................................................................................................... 20

5.3 DC Test Modes ................................................................................................................ 20

5.3.1 DC Common Mode ............................................................................................. 20

5.3.2 DC Differential ..................................................................................................... 20

6. DIGITAL INPUTS .................................................................................................................... 22

6.1 TDATA Connection ..........................................................................................................22

6.2 MCLK Connection ............................................................................................................22

6.3 MSYNC Connection ......................................................................................................... 22

6.4 GPIO Connections ...........................................................................................................23

7. ANALOG OUTPUTS ............................................................................................................... 24

7.1 Differential Signals ........................................................................................................... 24

7.2 Analog Output Attenuation ............................................................................................... 24

7.3 OUT± Precision Output .................................................................................................... 25

7.4 BUF± Buffered Output ..................................................................................................... 25

7.5 CAP± Analog Output ........................................................................................................ 25

8. VOLTAGE REFERENCE ........................................................................................................ 26

8.1 VREF Power Supply ........................................................................................................ 26

8.2 VREF RC Filter ................................................................................................................ 26

8.3 VREF PCB Routing .......................................................................................................... 26

8.4 VREF Input Impedance .................................................................................................... 27

8.5 VREF Accuracy ................................................................................................................ 27

8.6 VREF Independence ....................................................................................................... 27

9. POWER SUPPLIES ................................................................................................................ 28

9.1 Power Supply Bypassing ................................................................................................. 28

9.2 PCB Layers and Routing ................................................................................................. 28

9.3 Power Supply Rejection ................................................................................................... 28

9.4 SCR Latch-up .................................................................................................................. 29

9.5 DC-DC Converters ..........................................................................................................29

10. TERMINOLOGY .................................................................................................................... 30

11. PIN DESCRIPTION ............................................................................................................... 31

12. PACKAGE DIMENSIONS ..................................................................................................... 33

13. ORDERING INFORMATION ................................................................................................ 34

14. ENVIRONMENTAL, MANUFACTURING, & HANDLING INFORMATION .......................... 34

15. REVISION HISTORY ...........................................................................................................34

CS4373A

DS699F2 3

LIST OF FIGURES

Figure 1. Digital Input Rise and Fall Times ................................................................................... 12

Figure 2. System Timing Diagram.................................................................................................14

Figure 3. MCLK / MSYNC Timing Detail....................................................................................... 14

Figure 4. CS4373A Block Diagram ............................................................................................... 16

Figure 6. Connection Diagram ...................................................................................................... 17

Figure 5. System Diagram ............................................................................................................ 17

Figure 7. Power Mode Diagram ....................................................................................................18

Figure 8. AC Differential Modes.................................................................................................... 19

Figure 9. AC Common Mode ........................................................................................................20

Figure 10. DC Test Modes............................................................................................................ 21

Figure 11. Digital Inputs ................................................................................................................ 22

Figure 12. Analog Outputs ............................................................................................................ 24

Figure 13. Voltage Reference Circuit............................................................................................26

Figure 14. Power Supply Diagram ................................................................................................ 28

LIST OF TABLES

Table 1. Selections for Operational Mode and Attenuation............................................................. 4

Table 2. Operational Modes.......................................................................................................... 19

Table 3. Output Attenuation Settings ............................................................................................24

Part #	CS4373A-ISZ
Description	Test DAC 28-Pin SSOP - Rail/Tube (Alt: CS4373A-ISZ)
Category	IC
Availability	In Stock
Qty	208

Qty	Price
1 - 1	$197.97652
2 - 3	$157.48132
4 - 6	$148.48239
7 - 14	$137.98363
15 +	$122.98541

CS4373A-ISZ

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