CS3301A Low-noise, Programmable Gain, Differential Amplifier Features & Desription Description z Signal Bandwidth: DC to 2 kHz The CS3301A is a low-noise differential input, dif- ferential output amplifier with programmable gain, z Selectable Gain: x1, x2, x4, x8, x16, x32, x64 optimized for amplifying signals from low-imped- ance sensors such as geophones. The gain z Differential Inputs, Differential Outputs settings are binary weighted (x1, x2, x4, x8, x16, Multiplexed inputs: INA, INB, 800 termination x32, x64) and are selected using simple pin set- Rough / fine outputs for CS5371A / 72A / 73A tings. Two sets of external inputs, INA and INB, Max signal amplitude: 5 V differential pp Low input bias: 1 nA typical simplify system design as inputs from a sensor and test DAC. An internal 800 termination can also be z Outstanding Noise Performance selected for noise tests. 8.5 nV/ Hz from 0.1 Hz to 2 kHz 0.180 V between 0.1 Hz and 10 Hz Amplifier noise performance is outstanding with a p-p noise density of 8.5 nV/ Hz over the 0.1 Hz to z Low Total Harmonic Distortion 2 kHz bandwidth. Distortion performance is also ex- -121 dB THD typical (0.0000891%) tremely good, typically -121 dB THD at x1 gain. Flat -112 dB THD maximum (0.0002512%) noise down to 0.1 Hz and low total harmonic distor- tion make this amplifier ideal for low-frequency, z Low Power Consumption low-amplitude, differential signals requiring maxi- Normal operation: 5.5 mA typical mum dynamic range. Power down: 10 A typical z Small 24-pin SSOP Package ORDERING INFORMATION z Bipolar Power Supply Configuration See page 15. VA+ = +2.5 V VA- = -2.5 V VD = +3.3 V VA+ CLK VD INA+ + INB+ OUTR+ - OUTF+ GAIN0 MUX0 GAIN1 MUX1 GAIN2 - OUTF- INA- OUTR- + INB- VA- PWDN GND Copyright Cirrus Logic, Inc. 2007 MAR 07 CS3301A TABLE OF CONTENTS 1. CHARACTERISTICS AND SPECIFICATIONS .............................................................................. 3 SPECIFIED OPERATING CONDITIONS ....................................................................................... 3 ABSOLUTE MAXIMUM RATINGS ................................................................................................. 3 TEMPERATURE CONDITIONS .................................................................................................... 3 ANALOG CHARACTERISTICS .....................................................................................................4 DIGITAL CHARACTERISTICS ......................................................................................................7 POWER SUPPLY CHARACTERISTICS ........................................................................................ 8 2. GENERAL DESCRIPTION ............................................................................................................. 9 2.1.Analog Signals.......................................................................................................................... 9 2.2.1. Analog Inputs................................................................................................................ 9 2.3.2. Analog Outputs............................................................................................................. 9 2.4.3. Differential Signals......................................................................................................10 2.5.Digital Signals ......................................................................................................................... 10 2.6.1. Clock Input.................................................................................................................. 10 2.7.2. Gain Selection ............................................................................................................10 2.8.3. Mux Selection .............................................................................................................10 2.9.4. Power Down Selection................................................................................................ 11 2.10.Power Supplies ..................................................................................................................... 11 2.11.1. Analog Power Supplies............................................................................................... 11 2.12.2. Digital Power Supplies................................................................................................ 11 2.13.Connection Diagram.............................................................................................................. 12 3. PIN DESCRIPTION ....................................................................................................................... 13 4. PACKAGE DIMENSIONS............................................................................................................. 14 5. ORDERING INFORMATION ........................................................................................................ 15 6. ENVIRONMENTAL, MANUFACTURING, & HANDLING INFORMATION .................................. 15 7. REVISION HISTORY ................................................................................................................... 16 LIST OF FIGURES Figure 1. CS3301A Noise Performance.......................................................................................... 4 Figure 2. Digital Input Rise and Fall Times .....................................................................................7 Figure 3. Multi-Channel System Architecture.................................................................................. 9 Figure 4. Single-Channel System Architecture ............................................................................. 10 Figure 5. CS3301A Amplifier Connections.................................................................................... 12 Figure 6. CS3301A Pin Assignments............................................................................................ 13 LIST OF TABLES Table 1. Digital Selections for Gain and Input Mux Control ............................................................ 7 Table 2. Pin Descriptions ............................................................................................................. 13 2 DS757F1