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Cirrus Logic

CS5373A Datasheet Preview

CS5373A Datasheet

High-performance Modulator and Test DAC

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CS5373A
Low-power, High-performance ∆Σ Modulator and Test DAC
Modulator Features
z Fourth-order ∆Σ Architecture
• Clock-jitter-tolerant architecture
• Input signal bandwidth: DC to 2 kHz
• Max AC amplitude: 5 Vpp differential
• Max DC amplitude: ± 2.5 Vdc differential
z High Dynamic Range
• 127 dB SNR @ 215 Hz BW (2 ms sampling)
• 124 dB SNR @ 430 Hz BW (1 ms sampling)
z Low Total Harmonic Distortion
• -118 dB THD typical (0.000126%)
• -112 dB THD maximum (0.000251%)
z Low Power Consumption: 25 mW, 10 µW
Test DAC Features
z Digital ∆Σ Input from CS5378 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
• Output signal bandwidth: DC to 100 Hz
• Max AC amplitude: 5 Vpp differential
• Max DC amplitude: + 2.5 Vdc 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
Common Features
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 CS5373A is a high-performance, fourth-order ∆Σ
modulator integrated with a ∆Σ digital-to-analog convert-
er (DAC). When combined with a CS3301A / CS3302A
differential amplifier and the CS5378 digital filter, a
small, low-power, self-testing, high-accuracy, single-
channel measurement system results.
The modulator has high dynamic range and low total har-
monic distortion with very low power consumption. It
converts differential analog input signals from the
CS3301A / CS3302A amplifier to an oversampled serial
bit stream at 512 kbits per second. This oversampled bit
stream is then decimated by the CS5378 digital filter to a
24-bit output at the selected output word rate.
The test DAC operates in either AC or DC test modes.
AC test modes measure system dynamic performance
through THD and CMRR tests while DC test modes are
for gain calibration and pulse tests. It has two sets of dif-
ferential analog outputs, OUT and BUF, as dedicated
outputs for testing the electronics channel and for in-
circuit sensor tests. Output attenuation settings are
binary weighted and match the gain settings of the
CS3301A / CS3302A differential amplifiers for full-scale
testing at all gain ranges.
ORDERING INFORMATION
See page 39.
VA+
VREF+ VREF-
VD
INR+
INF+
INF-
INR-
OUT+
OUT-
BUF+
BUF-
24-Bit
∆Σ
Modulator
Clock
Generator
Attenuator
1/1 to 1/64
24-Bit
∆Σ
Test DAC
MDATA
MFLAG
MCLK
MSYNC
TDATA
CAP+
CAP-
VA-
ATT(0, 1, 2)
MODE(0, 1, 2) GND
http://www.cirrus.com
Copyright © Cirrus Logic, Inc. 2006
(All Rights Reserved)
DEC ‘06
DS703F1




Cirrus Logic

CS5373A Datasheet Preview

CS5373A Datasheet

High-performance Modulator and Test DAC

No Preview Available !

CS5373A
TABLE OF CONTENTS
1. CHARACTERISTICS AND SPECIFICATIONS ........................................................................ 4
SPECIFIED OPERATING CONDITIONS ................................................................................. 4
TEMPERATURE CONDITIONS ............................................................................................... 5
ABSOLUTE MAXIMUM RATINGS ........................................................................................... 5
ANALOG INPUT CHARACTERISTICS ................................................................................... 6
ANALOG OUTPUT CHARACTERISTICS ............................................................................... 7
MODULATOR CHARACTERISTICS ........................................................................................ 8
PERFORMANCE PLOTS ......................................................................................................... 9
DAC AC DIFFERENTIAL MODES 1, 2, 3............................................................................... 10
DIGITAL CHARACTERISTICS .............................................................................................. 15
POWER SUPPLY CHARACTERISTICS ................................................................................ 18
2. GENERAL DESCRIPTION ..................................................................................................... 19
2.1 Delta-Sigma Modulator .................................................................................................... 19
2.2 Digital-to-Analog Converter .............................................................................................. 19
3. SYSTEM DIAGRAM ............................................................................................................ 20
4. POWER MODES ..................................................................................................................... 21
4.1 Power Down ..................................................................................................................... 21
4.2 Sleep Mode ...................................................................................................................... 21
4.3 Modulator Mode ............................................................................................................... 21
4.4 AC Test Modes ................................................................................................................ 21
4.5 DC Test Modes ................................................................................................................ 21
5. OPERATIONAL MODES ........................................................................................................ 22
5.1 Modulator Mode ............................................................................................................... 22
5.1.1 Modulator One’s Density ..................................................................................... 22
5.1.2 Modulator Decimated Output .............................................................................. 22
5.1.3 Modulator Synchronization .................................................................................. 22
5.1.4 Modulator Idle Tones .......................................................................................... 23
5.1.5 Modulator Stability ............................................................................................... 23
5.2 AC Test Modes ................................................................................................................ 23
5.2.1 AC Differential ..................................................................................................... 23
5.2.2 AC Common Mode .............................................................................................. 24
5.2.3 DAC Stability ....................................................................................................... 24
5.3 DC Test Modes ................................................................................................................ 24
5.3.1 DC Common Mode ............................................................................................. 24
5.3.2 DC Differential ..................................................................................................... 25
5.4 Sleep Mode ...................................................................................................................... 25
6. DIGITAL SIGNALS ................................................................................................................. 26
6.1 MCLK Connection ............................................................................................................ 26
6.2 MSYNC Connection ......................................................................................................... 26
6.3 MDATA Connection ......................................................................................................... 27
6.4 MFLAG Connection ......................................................................................................... 27
6.5 TDATA Connection .......................................................................................................... 27
6.6 GPIO Connections ........................................................................................................... 27
7. ANALOG SIGNALS ................................................................................................................ 28
7.1 INR±, INF± Modulator Inputs ........................................................................................... 28
7.1.1 Modulator Input Impedance ................................................................................ 28
7.1.2 Modulator Anti-alias Filter ................................................................................... 28
7.2 DAC Output Attenuation .................................................................................................. 29
7.3 DAC OUT± Precision Output ........................................................................................... 29
7.4 DAC BUF± Buffered Output ............................................................................................. 30
7.5 DAC CAP± Connection .................................................................................................... 30
7.6 Analog Differential Signals ............................................................................................... 30
8. VOLTAGE REFERENCE ........................................................................................................ 31
2 DS703F1


Part Number CS5373A
Description High-performance Modulator and Test DAC
Maker Cirrus Logic
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