Document
CS3301
Low-noise, Programmable Gain, Differential Amplifier
Features & Desription
Description
z Signal Bandwidth: DC to 2 kHz z Selectable Gain: x1, x2, x4, x8, x16, x32, x64 z Differential Inputs, Differential Outputs
• Multiplexed inputs: INA, INB, 800Ω termination • Rough / fine charge outputs for CS5371/72
• Max signal amplitude: 5 Vpp differential • Low input bias: 500 pA
z Outstanding Noise Performance
• 0.20 µVp-p between 0.1 Hz and 10 Hz • 8.5 nV/ Hz from 0.1 Hz to 2 kHz
z Low Total Harmonic Distortion
• -118 dB THD typical (0.000126%)
• -112 dB THD maximum (0.000251%)
z Low Power Consumption
• Normal/LPWR/PWDN: 5.5 mA, 3.5 mA, 10 µA
z Single or Dual Power Supply Configurations
• 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
The CS3301 is a low-noise differential input, differential output amplifier with programmable gain, optimized for amplifying signals from low-impedance sensors such as geophones. The gain settings are binary weighted (x1, x2, x4, x8, x16, x32, x64) and are selected using simple pin settings. Two sets of external inputs, INA and INB, simplify system design as inputs from a sensor and test DAC. An internal 800 Ω termination can also be selected for noise tests.
Amplifier noise performance is outstanding with a noise density of 8.5 nV/ Hz over the 0.1 Hz to 2 kHz bandwidth. Distortion performance is also extremely good, typically -118 dB THD. Flat noise down to 0.1 Hz and low total harmonic distortion make this amplifier ideal for low-frequency, low-amplitude, differential signals requiring maximum dynamic range.
ORDERING INFORMATION
See page 15.
INA+ INB+
VA+
400 Ω
MUX0 MUX1
400 Ω
INAINB-
VA-
CLK
VD
+ 658000 Ω
OUTR+ - OUTF+
65800 Ω
GAIN0 GAIN1 GAIN2
65800 Ω
- OUTF-
OUTR-
+ 65800 Ω
LPWR PWDN DGND
http://www.cirrus.com
Copyright © Cirrus Logic, Inc. 2007 (All Rights Reserved)
DEC ‘07 DS595F3
CS3301
TABLE OF CONTENTS
1. CHARACTERISTICS AND SPECIFICATIONS .............................................................................. 4 SPECIFIED OPERATING CONDITIONS ....................................................................................... 4 ABSOLUTE MAXIMUM RATINGS ................................................................................................. 4 THERMAL CHARACTERISTICS .................................................................................................. 5 ANALOG CHARACTERISTICS ..................................................................................................... 5 DIGITAL CHARACTERISTICS ...................................................................................................... 8 POWER SUPPLY CHARACTERISTICS ........................................................................................ 9
2. GENERAL DESCRIPTION ........................................................................................................... 10 2.1. Analog Signals ........................................................................................................................ 10 2.2.1. Analog Inputs.............................................................................................................. 10 2.3.2. Analog Outputs ........................................................................................................... 10 2.4.3. Differential Signals...................................................................................................... 11 2.5. Digital Signals ......................................................................................................................... 11 2.6.1. Clock Input.................................................................................................................. 11 2.7.2. Gain Selection ............................................................................................................ 11 2.8.3. Mux Selection ............................................................................................................. 11 2.9.4. Low Power Selection .................................................................................................. 11 2.10.5. Power Down Selection................................................................................................ 11 2.11.Power Supplies ..................................................................................................................... 11 2.12.1. Analog Power Supplies............................................................................................... 11 2.13.2. Digital Power Supplies................................................................................................ 12 2.14.Connection Diagram.............................................................................................................. 13
3. PIN DESCRIPTION ....................................................................................................................... 14 4. ORDERING INFORMATION ................