Cirrus-logic CS3002 Manuale Utente Scaricare il pdf

Cirrus Logic, Inc.

http://www.cirrus.com

CS3002

Precision Low-voltage Amplifier; DC to 2kHz

Features & Description

• Low Offset: 10V Max

• Low Drift: 0.05V/°C Max

• Low Noise

- 6nV/ @ 0.5Hz

- 0.1 to 10Hz = 125 nVpp

- 1/f corner @ 0.08Hz

• Open-loop Voltage Gain

- 300dB Typical

- 200dB Minimum

• Rail-to-rail Output Swing

• Slew Rate: 5V/s

Applications

• Thermocouple/Thermopile Amplifiers

• Load Cell and Bridge Transducer Amplifiers

• Precision Instrumentation

• Battery-powered Systems

Description

The CS3002 dual amplifier is designed for precision am-

plification of low-level signals and is ideally suited for

applications that require very high closed-loop gains.

These amplifiers achieve excellent offset stability, super-

high open-loop gain, and low noise over time and tem-

perature. The devices also exhibit excellent CMRR and

PSRR. The common mode input range includes the neg-

ative supply rail. The amplifiers operate with any total

supply voltage from 2.7V to 6.7V (±1.35V to ±3.35V).

Pin Configuration

Out A

-In A

+In A

V-

V+

Out B

-In B

+In B

CS3002

8-lead SOIC

Noise vs. Frequency (Measured)

100

0.001 0.01 0.1 1 10

Frequency (Hz)

nV/√Hz

CS3002

100

64.9k

0.015F

Dexter Research

Thermophile 1M

DEC ‘12

DS490F10

1 2 3 4 5 6 ... 13 14

Sommario

Pagina 1 - Pin Configuration

Pagina 2 - LIST OF FIGURES

CS300210 DS490F10Equation 4 is used to determine transfer function zeroZ1. where |A| = R2/R1Substituting A into Equation 4 then zero Z1 is:Equation 6

Pagina 3 - 1.2 Absolute Maximum Ratings

CS3002DS490F10 113.2.2 Gain Calculation RecommendationsCondition 1: |Av|  50 and R1  100The op amp is inherently stable for |Av|  50 andR1  100.

Pagina 4 - 2. TYPICAL PERFORMANCE PLOTS

CS300212 DS490F103.3 ApplicationsThe CS3002 amplifiers are optimum for applicationsthat require high gain and low drift. Figure 17 illustratesa thermo

Pagina 5 - Phase (Degrees)

CS3002DS490F10 134. PACKAGE DRAWING5. ORDERING INFORMATION 6. ENVIRONMENTAL, MANUFACTURING, & HANDLING INFORMATION* MSL (Moisture Sensitivity Leve

Pagina 6 - Normalized to CM = 2.5 V

CS300214 DS490F107. REVISION HISTORY Contacting Cirrus Logic SupportFor all product questions and inquiries contact a Cirrus Logic Sales Representativ

Pagina 7 - DS490F10 7

CS30022 DS490F10TABLE OF CONTENTS1. Characteristics and Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31.1

Pagina 8 - 3. OVERVIEW

CS3002DS490F10 31. CHARACTERISTICS AND SPECIFICATIONS1.1 Electrical CharacteristicsTypical characteristics conditions: •TA=25°C, V+=+5V, V-=0V, VCM=2.

Pagina 9 - . For a gain of 50, the

CS30024 DS490F102. TYPICAL PERFORMANCE PLOTSFigure 1. Noise vs. Frequency (Measured)Figure 2. Noise vs. FrequencyFigure 3. 0.01Hz to 10Hz NoiseFigu

Pagina 10 - FREQUENCY

CS3002DS490F10 5-500-400-300-200-1000100200300400500Figure 7. Open-loop Gain and Phase vs. Frequency1 10 100 1k 10k 1M 10MFrequency (Hz)100kGAINPHASE

Pagina 11 - Condition 3:

CS30026 DS490F10Supply Voltage (±V)Input Bias Current (pA)A1-A1+B1-A2+B1+A2-B2-B2+±1.35±2±2.5 ±3.35-200-150-150-100-1000-50-50CM = 0 VFigure 9. Input

Pagina 12 - 3.3 Applications

CS3002DS490F10 7Figure 11. Voltage Swing vs. Output CurrentFigure 12. Voltage Swing vs. Output Current (5V)-200-150-250-100-50V+V–+50+100+150+200+25

Pagina 13 - 5. ORDERING INFORMATION

CS30028 DS490F103. OVERVIEWThe CS3002 amplifiers are designed for precisionmeasurement of signals from DC to 2kHz whenoperating from a supply voltage

Pagina 14 - 7. REVISION HISTORY

CS3002DS490F10 93.2 Open-loop Gain and Stability3.2.1 DiscussionThe CS3002 achieves ultra-high open-loop gain.Figure 14 illustrates the amplifier in a

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