CS3001_08 CIRRUS [Cirrus Logic], CS3001_08 Datasheet

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CS3001_08

Manufacturer Part Number
CS3001_08
Description
Precision Low-voltage Amplifier; DC to 2 kHz
Manufacturer
CIRRUS [Cirrus Logic]
Datasheet
Features
Applications
http://www.cirrus.com
Low Offset: 10 µV Max
Low Drift: 0.05 µV/°C Max
Low Noise
– 6 nV/√Hz @ 0.5 Hz
– 0.1 to 10 Hz = 125 nVp-p
– 1/f corner @ 0.08 Hz
Open-loop Voltage Gain
– 300 dB Typical
– 200 dB Minimum
Rail-to-rail Output Swing
Slew Rate: 5 V/µs
Thermocouple/Thermopile Amplifiers
Load Cell and Bridge Transducer Amplifiers
Precision Instrumentation
Battery-powered Systems
100
10
1
0.001
Precision Low-voltage Amplifier; DC to 2 kHz
& Description
Noise vs. Frequency (Measured)
0.01
Frequency (Hz)
0.1
Copyright © Cirrus Logic, Inc. 2008
1
(All Rights Reserved)
10
Description
The CS3001 single amplifier and the CS3002 dual am-
plifier are designed for precision amplification of low-
level signals and are ideally suited to 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 temperature. The de-
vices also exhibit excellent CMRR and PSRR. The
common mode input range includes the negative supply
rail. The amplifiers operate with any total supply voltage
from 2.7 V to 6.7 V (±1.35 V to ±3.35 V).
Pin Configurations
PWDN
+In
-In
V-
8-lead SOIC
1
2
3
4
Dexter Research
Thermopile 1M
CS3001
-
+
Thermopile Amplifier with a Gain of 650 V/V
100
R1
8
7
6
5
NC
V+
Output
NC
Out A
+In A
-In A
CS3001
V-
1
2
3
4
0.015 µ F
CS3001
CS3002
64.9k
8-lead SOIC
R2
C1
CS3002
-
A
+
+
B
-
DS490F8
OCT ‘08
8
7
6
5
V+
Out B
-In B
+In B

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CS3001_08 Summary of contents

Page 1

Precision Low-voltage Amplifier kHz Features & Description Low Offset: 10 µV Max Low Drift: 0.05 µV/°C Max Low Noise – 6 nV/√Hz @ 0.5 Hz – 0 125 nVp-p – 1/f corner @ ...

Page 2

CHARACTERISTICS AND SPECIFICATIONS .............................................. 3 ELECTRICAL CHARACTERISTICS...................................................................3 ABSOLUTE MAXIMUM RATINGS .....................................................................4 2. TYPICAL PERFORMANCE PLOTS .............................................................. 4 3. CS3001/CS3002 OVERVIEW ......................................................................... 8 3.1 Open-loop Gain and Phase Response .................................................................8 3.2 Open-loop Gain and Stability Compensation .......................................................9 3.2.1 Discussion ...................................................................................................9 ...

Page 3

CHARACTERISTICS AND SPECIFICATIONS ELECTRICAL CHARACTERISTICS Parameter Input Offset Voltage Average Input Offset Drift Long Term Input Offset Voltage Stability Input Bias Current Input Offset Current = 100 Ω, f Input Noise Voltage Density 100 Ω, f ...

Page 4

ABSOLUTE MAXIMUM RATINGS Parameter Supply Voltage [(V+) - (V-)] Input Voltage Storage Temperature Range 2. TYPICAL PERFORMANCE PLOTS Noise vs. Frequency (Measured) 100 10 1 0.001 0.01 0.1 Frequency (Hz) Figure 1. Noise vs. Frequency (Measured) 100 50 0 -50 ...

Page 5

Typical Performance Plots (Cont.) 2 1.9 1.8 1.7 1.6 1 Supply Voltage (V) Figure 7. Supply Current vs. Voltage, 3001 500 400 300 200 100 0 -100 -200 -300 -400 -500 DS490F8 3.8 3.7 3.6 3.5 3.4 ...

Page 6

Typical Performance Plots (Cont.) Figure 10. Open-loop Gain and Phase vs. Frequency (Expanded) 6 100 -45 -90 -135 -180 -225 -270 -315 -360 10K 100K Figure 11. Input Bias Current vs. Supply Voltage CS3001 CS3002 ...

Page 7

Typical Performance Plots (Cont.) V+ -50 -100 -150 +125°C -200 -250 +250 +200 +150 +100 +50 V– Output Current (mA) Figure 13. Voltage Swing vs. Output Current (2.7 V) DS490F8 ...

Page 8

CS3001/CS3002 OVERVIEW The CS3001/CS3002 amplifiers are designed for precision measurement of signals from kHz when operating from a supply voltage of +2 +6.7 V (± 1.35 to ± 3.35 V). The ampli- fiers are ...

Page 9

Open-loop Gain and Stability Compensation 3.2.1 Discussion The CS3001 and CS3002 achieve ultra-high open loop gain. Figure 16 illustrates the amplifier in a non-inverting gain configuration. The open loop gain and phase plots indicate that the amplifier is stable ...

Page 10

Vin R1 Figure 17. Non-inverting Gain Configuration with Compensation The feedback capacitor C2 is required for closed- loop gains greater than 50 V/V. The capacitor in- This indicates that the separation of the pole and the zero is governed by ...

Page 11

The loop gain plot shown in Figure 18 the unity gain configuration, and indicates how this is modified when using the amplifier in a higher gain configuration with compensation con- figured for higher gain, for example, 60 ...

Page 12

Gain Calculations Summary and Recommendations Condition #1: |Av| ≤ 50 and R1 ≤ 100 Ω The Opamp is inherently stable for |Av| ≤ 50 and R1 ≤ 100 Ω compensation capacitor across R2 is required. • ...

Page 13

Applications The CS3001 and CS3002 amplifiers are optimum for applications that require high gain and low drift. Figure 19 illustrates a thermopile amplifier with a gain of 650 V/V. The thermopile outputs only a few millivolts when subjected to ...

Page 14

PACKAGE DRAWING 8L SOIC (150 MIL BODY) PACKAGE DRAWING 1 b SEATING PLANE e DIM ∝ INCHES MIN MAX 0.053 0.069 0.004 0.010 ...

Page 15

ORDERING INFORMATION Model CS3001-IS CS3001-ISZ (lead free) CS3002-IS CS3002-ISZ (lead free) 6. ENVIRONMENTAL, MANUFACTURING, & HANDLING INFORMATION Model Number CS3001-IS CS3001-ISZ (lead free) CS3002-IS CS3002-ISZ (lead free) * MSL (Moisture Sensitivity Level) as specified by IPC/JEDEC J-STD-020. DS490F8 Temperature ...

Page 16

REVISION HISTORY Revision Date F3 OCT 2004 F4 AUG 2005 F5 AUG 2006 F6 SEP 2006 F7 NOV 2007 F8 OCT 2008 Contacting Cirrus Logic Support For all product questions and inquiries contact a Cirrus Logic Sales Representative. To ...

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