CS3002-ISZ Cirrus Logic

CS3001 CS3002 Precision Low Voltage Amplifier DC to 2 kHz Features Description The CS3001 single amplifier and the CS3002 dual am- Low Offset: 10 VMax plifier are designed for precision amplification of low Low Drift: 0.05 V/C Max level signals and are ideally suited to applications that Low Noise require very high closed loop gains. These amplifiers 6nV/Hz 0.5Hz achieve excellent offset stability, super high open loop gain, and low noise over time and temperature. The de- 0.1 to 10 Hz = 125 nVp-p vices also exhibit excellent CMRR and PSRR. The 1/f corner 0.08 Hz common mode input range includes the negative supply Open-Loop Voltage Gain rail. The amplifiers operate with any total supply voltage 1000 Trillion Typ from 2.7 V to 6.7 V (1.35 V to 3.35 V). 10 Billion Min Pin Configurations Rail-to-Rail Output Swing 1.8 mA Supply Current CS3001 CS3002 Slew rate: 5 V/ s Out A 1 1 8 V+ PWDN 8 NC Applications A - 2 2 7 V+ -In A 7 Out B -In + - Thermocouple/Thermopile Amplifiers + B +In 3 +In A 3 6 Output 6 -In B + - Load Cell and Bridge Transducer Amplifiers V- 4 5 NC V- 4 5 +In B Precision Instrumentation 8-lead SOIC 8-lead SOIC Battery-Powered Systems CS3001 Noise vs. Frequency (Measured) Dexter Research 100 Thermopile 1M R2 64.9k 10 R1 C1 100 0.015 F 1 0.001 0.01 0.1 1 10 Frequency (Hz) Thermopile Amplifier with a Gain of 650 V/V This document contains information for a new product. Preliminary Product Information Cirrus Logic reserves the right to modify this product without notice. Cirrus Logic, Inc. Copyright Cirrus Logic, Inc. 2002 CS3001 CS3002 TABLE OF CONTENTS 1. CHARACTERISTICS AND SPECIFICATIONS ................................................... 3 1.1 Electrical Characteristics ...................................................................................... 3 1.2 Absolute Maximum Ratings ................................................................................. 4 2. PERFORMANCE PLOTS ......................................................................................... 4 3. CS3001/CS3002 OVERVIEW ................................................................................... 7 3.1 Open Loop Gain and Phase Response .................................................................. 7 3.2 Open Loop Gain and Stability Compensation ...................................................... 8 3.3 Powerdown (PDWN) ......................................................................................... 10 3.4 Applications ........................................................................................................ 11 4. PACKAGE DRAWING ........................................................................................... 13 5. ORDERING INFORMATION ............................................................................... 14 LIST OF FIGURES Figure 1. Noise vs Frequency (Measured) .........................................................................4 Figure 2. 0.01 Hz to 10 Hz Noise .......................................................................................4 Figure 3. Noise vs Frequency ............................................................................................4 Figure 4. Offset Voltage Stability (DC to 3.2 Hz) ...............................................................4 Figure 5. Open Loop Gain and Phase vs Frequency .........................................................5 Figure 6. Open Loop Gain and Phase vs Frequency (Expanded) .....................................5 Figure 7. Input Bias Current vs Supply Voltage (CS3002) .................................................6 Figure 8. Input Bias Current vs Common Mode Voltage ...................................................6 Figure 9. CS3001/CS3002 Open Loop Gain and Phase Response ..................................7 Figure 10. Non-Inverting Gain Configuration .....................................................................8 Figure 11. Non-Inverting Gain Configuration with Compensation ......................................9 Figure 12. Loop Gain Plot: Unity Gain and with Pole-Zero Compensation ......................10 Figure 13. Thermopile Amplifier with a Gain of 650 V/V ..................................................11 Figure 14. Load Cell Bridge Amplifier and A/D Converter ...............................................12 Contacting Cirrus Logic Support For all product questions and inquiries contact a Cirrus Logic Sales Representative. To find one nearest you go to <