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Cirrus Logic

CS5374 Datasheet Preview

CS5374 Datasheet

Dual High-performance Amplifier

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CS5374
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Dual High-performance Amplifier & ΔΣ Modulator
Features
High Input Impedance Differential Amplifier
• Ultra-low input bias: < 1 pA
• Max signal amplitude: 5 Vpp differential
Fourth Order Delta-Sigma (ΔΣ) Modulator
• Signal Bandwidth: DC to 2 kHz
• Common mode rejection: 110 dB CMRR
Differential Analog Input, Digital ΔΣ Output
• Multiplexed inputs: INA, INB, 800Ω termination
• Selectable Gain: 1x, 2x, 4x, 8x, 16x, 32x, 64x
Excellent Amplifier Noise Performance
• 1.5 μVpp between 0.1 Hz and 10 Hz
• 11 nV / Hz from 200 Hz to 2 kHz
High Modulator Dynamic Range
• 126 dB SNR @ 215 Hz BW (2 ms sampling)
• 123 dB SNR @ 430 Hz BW (1 ms sampling)
Low Total Harmonic Distortion
• –118 dB THD typical (0.000126%)
• –108 dB THD maximum (0.0004%)
Low Power Consumption
• Normal operation: 6.5 mA per channel
• Power down: 15 μA per channel max
Dual Power Supply Configuration
• VA+ = +2.5 V; VA– = –2.5 V; VD = +3.3 V
Description
The CS5374 combines two marine seismic analog mea-
surement channels into one 7 mm x 7 mm QFN
package. Each measurement channel consists of a high
input impedance programmable gain differential amplifi-
er that buffers analog signals into a high-performance,
fourth-order ΔΣ modulator. The low-noise ΔΣ modulator
converts the analog signal into a one-bit serial bit stream
suitable for the CS5376A digital filter.
Each amplifier has two sets of external inputs, INA and
INB, to simplify system design as inputs from a hydro-
phone sensor or the CS4373A test DAC. An internal
800Ω termination can also be selected for noise tests.
Gain settings are binary weighted (1x, 2x, 4x, 8x, 16x,
32x, 64x) and match the CS4373A test DAC output at-
tenuation settings for full-scale testing at all gain ranges.
Both the input multiplexer and gain are set by registers
accessed through a standard SPI™ port.
Each fourth-order ΔΣ modulator has very high dynamic
range combined with low total harmonic distortion and
low power consumption. It converts differential analog
signals from the amplifier to an oversampled ΔΣ serial bit
stream which is decimated by the CS5376A digital filter
to a 24-bit output at the final output word rate.
ORDERING INFORMATION
See page 43.
INA1+
INB1+
GUARD1
+
-
MUX1
INA1-
INB1-
VA+
VA-
INA2+
INB2+
-
+
+
-
OUT1+ OUT1- INR1- INF1- INF1+INR1+
VA- VA+
Reset, Clock,
and
Synchronization
RST
MCLK
MSYNC
CS5374
4th Order
Modulator
4th Order
Modulator
MDATA1
MFLAG1
VD
GND
MDATA2
MFLAG2
MUX2
INA2-
INB2-
GUARD2
-
+
SPITM Serial
Interface
SDO
SDI
SCLK
CS
OUT2+ OUT2- INR2- INF2- INF2+INR2+
VREF+ VREF-
Preliminary Product Information
http://www.cirrus.com
This document contains information for a new product.
Cirrus Logic reserves the right to modify this product without notice.
Copyright Cirrus Logic, Inc. 2009
(All Rights Reserved)
OCT '09
DS862F1




Cirrus Logic

CS5374 Datasheet Preview

CS5374 Datasheet

Dual High-performance Amplifier

No Preview Available !

CS5374
DS862F1
CS5374
TABLE OF CONTENTS
www.DataSheet4U.com
1. CHARACTERISTICS AND SPECIFICATIONS ....................................................................... 4
SPECIFIED OPERATING CONDITIONS ................................................................................ 4
ABSOLUTE MAXIMUM RATINGS .......................................................................................... 4
THERMAL CHARACTERISTICS ............................................................................................. 5
ANALOG CHARACTERISTICS ............................................................................................... 5
PERFORMANCE SPECIFICATIONS ...................................................................................... 7
CHANNEL PERFORMANCE PLOTS ...................................................................................... 9
DIGITAL CHARACTERISTICS .............................................................................................. 10
SPI™ INTERFACE TIMING (EXTERNAL MASTER) ............................................................ 12
POWER SUPPLY CHARACTERISTICS ............................................................................... 13
2. GENERAL DESCRIPTION..................................................................................................... 14
3. AMPLIFIER OPERATION ...................................................................................................... 16
3.1 Amplifier Inputs — INA, INB .......................................................................................... 16
3.1.1 Multiplexer Settings — MUX ............................................................................... 16
3.1.2 Gain Settings — GAIN ........................................................................................ 16
3.2 Amplifier Outputs — OUTR, OUTF ............................................................................... 16
3.2.1 Guard Output — GUARD.................................................................................... 16
3.3 Differential Signals ........................................................................................................ 17
4. MODULATOR OPERATION .................................................................................................. 18
4.1 Modulator Anti-Alias Filter ............................................................................................. 18
4.2 Modulator Inputs — INR, INF ........................................................................................ 19
4.2.1 Modulator Input Impedance ................................................................................ 19
4.2.2 Modulator Idle Tones — OFST ........................................................................... 19
4.3 Modulator Output — MDATA ........................................................................................ 19
4.3.1 Modulator One’s Density ..................................................................................... 19
4.3.2 Decimated 24-bit Output ..................................................................................... 19
4.4 Modulator Stability — MFLAG....................................................................................... 20
4.5 Modulator Clock Input — MCLK.................................................................................... 20
4.6 Modulator Synchronization — MSYNC ......................................................................... 20
5. SPITM SERIAL PORT ............................................................................................................. 21
5.1 SPI Pin Descriptions ..................................................................................................... 21
5.2 SPI Serial Transactions................................................................................................. 21
5.3 SPI Registers ................................................................................................................ 23
5.3.1 VERSION — 0x00............................................................................................... 23
5.3.2 AMP1CFG — 0x01 ............................................................................................. 23
5.3.3 AMP2CFG — 0x02 ............................................................................................. 23
5.3.4 ADCCFG — 0x03................................................................................................ 24
5.3.5 PWRCFG — 0x04 ............................................................................................... 24
5.4 Example: CS5374 Configuration by an External SPI Master ........................................ 24
5.5 Example: CS5374 Configuration by the CS5376A SPI 2 Port ...................................... 25
5.5.1 CS5376A SPI 1 Transactions ............................................................................. 25
6. POWER MODES .................................................................................................................... 29
6.1 Normal Operation .......................................................................................................... 29
6.2 Power Down, MCLK Enabled........................................................................................ 29
6.3 Power Down, MCLK Disabled ....................................................................................... 29
7. VOLTAGE REFERENCE ....................................................................................................... 30
7.1 VREF Power Supply ..................................................................................................... 30
7.2 VREF RC Filter ............................................................................................................. 30
7.3 VREF PCB Routing ....................................................................................................... 30
7.4 VREF Input Impedance................................................................................................. 30
7.5 VREF Accuracy............................................................................................................. 31
8. POWER SUPPLIES .............................................................................................................. 32
8.1 Analog Power Supplies ................................................................................................. 32
8.2 Digital Power Supply ..................................................................................................... 32
8.3 Power Supply Bypassing .............................................................................................. 32
2 DS862F1


Part Number CS5374
Description Dual High-performance Amplifier
Maker Cirrus Logic
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CS5374 Datasheet PDF






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