仪表运放选型指南

2.01 2.95 1.69
Low gain drift G = 10, G = 100 AD8221 + two precision op amps Zero drift with resistor-programmable gain Digitally programmable, zero drift, with extra precision op amp Lowest power, smallest in-amp on the market Lowest power in-amp on the market Digitally programmable, fast settling Digitally programmable, fast settling Digitally programmable, fast settling Low voltage, zero drift
For more information on ADI difference and instrumentation amplifiers, visit www.analog.com/currentsenseamps, www.analog.com/differenceamps, and www.analog.com/inamps.
1 to 10,000 0.1 10, 100 0.15 (G = 10, 100) 1 to 1000 0.15 1 to 1000 5 to 1000 1 to 1000 1 to 1000 1 to 1000 1 to 10,000 5 to 1000 1 to 1000 1 to 1000 5 to 1000 10,100 1 to 1000 10 to 1000 1, 2, 4, 8, 16, 32, 64, 128 5 to 200 5 to 200 1, 2, 5, 10 1, 2, 4, 8 1, 10, 100, 1000 0.1 to 10,000 0.1 0.1 (G = 5) 0.06 0.1 0.02 0.05 0.1 0.06 0.04 0.04 (G = 5) 0.07 (G = 10) 0.05 0.01 0.05 0.05 (G = 5) 0.05 (G = 5) 0.03 0.03 0.03 0.05 (G = 100)
3.5 4.5 0.04 0.04 4.5 4.5 5.3 1.2
4.95 4.95 4.95 1.30
USD 1000s, recommended resale, FOB U.S.A.
Instrumentation Amplifier Applications
• Transducer interfaces • Bridge amplifiers • Strain gages
Input Voltage Settling Time Input Voltage Input Voltage Input Bias BW @ G = 1 CMRR @ 60 Hz Noise Density to 0.01% G = 1 Offset TC Max Offset (RTI) Max Current Max (f Typ (kHz) G = 1 Min (dB) = 1 kHz) (������V/°C) (������V) (nA) Typ (������s) Max (nV/√Hz) 73 1 125 2 13 15 1000 93 (G = 10) 2.5 (total RTI) 250 (total RTI) 2 17 (total RTI) 12 (G = 10, 100) 800 (G = 10) 66 1 125 5 12 (typ) 10 (to 0.1%) 1000 70 77 (G = 5) 78 80 90 80 82 (G = 5) 78 80 90 (G = 5) 94 (G = 10) 80 110 (G = 10) 80 90 (G = 5) 86 (G = 5) 80 80 80 100 (G = 10) 2 3 10 0.9 0.3 0.4 4 10 2 2 0.9 0.4 0.05 0.05 0.7 (typ) 2.5 (typ) 1.2 1.2 1.2 0.1 200 200, 250 250, 300 70 25 60 250 300 200 200 90 120 10 15 2.5 3.5 200 200 150 20 25 10 0.025 2 0.4 2 25 0.025 27 27 1.5 2 1 0.5 0.05 0.01 30 30 50 1 35 (typ) 38 (typ) 17 8 8 8 35 17 24 25 8 8 240 32 76 76 18 18 10 30 30 135 (G = 5), 65 (G = 5) 5, 2.5 10 10 10 90 (G = 5) 5, 2.5 25 14 (G = 5) 6 (G = 10) 10 — 4 444 (G = 5) 444 (G = 5) 0.585 0.615 0.78 — 800 80 (G = 5) 1500 825 825 1200 180 (G = 5) 1500 1500 250 (G = 5) 650 (G = 10) 1200 2 (G = 10) 2700 23 (G = 5) 23 (G = 5) 10,000 10,000 10,000 1
RG R OP AMP R1
OP AMP
RG
IN-AMP
SENSOR
MUX
ADC
DAC
ISOLATION
R2
POWER MANAGEMENT
MICROPROCESSOR SUPERVISORY
ADI’s Difference and Instrumentation Amplifiers Solve the Dilemma Discrete Solutions • 2 to 3 op amps • 7 to 9 resistors • More board space • Higher cost • 250% more error than monolithic solutions ADI’s Monolithic Solutions • 1 in-amp • 1 resistor • Less board space • Lower cost • Better performance
INSTRUMENTATION AND DIFFERENCE AMPLIFIERS FIT HERE
SIGNAL CONDITIONING VREF INTERFACE RS-232 RS-485 DIGITAL CONTROL DSP/ P/ C/PC
• Medical instrumentation • Industrial process control • Data acquisition • Power monitoring
1
Package SOIC MSOP DIP • • • • • • • • • 16-lead LFCSP • • • • • • • •
Rail-to-Rail Output
Supply Current Max (mA) 1来自百度文库3 1.3 1.3
Operating Voltage Range (V) ±2.3 to ±18 ±2.3 to ±18 ±2.6 to ±18 ±2.5 to ±6, 2.7 to 12 ±1.1 to ±18, 2.2 to 36 ±2.25 to ±18, 4.5 to 36 ±2.3 to ±18 ±2.3 to ±18 ±2.3 to ±18 ±2.5 to ±12.5, 2.7 to 25 ±2.25 to ±18, 4.5 to 36 ±1.35 to ±18, 2.2 to 36 ±1.5 to ±18, 2.2 to 36 ±2.3 to ±18 ±2.3 to ±18 ±4 to ±8, 8 to 16 ±1.5 to ±3 3 to 6 1.8 to 5.5 1.8 to 5.5 ±5 to ±17 ±5 to ±17 ±5 to ±17 1.8 to 5.5
Instrumentation Amplifiers
Part Number AD620 AD621 AD622 AD623 AD627 AD8220 AD8221A AD8221B AD8222 AD8223 AD8224 AD8226 AD8227 AD8228 AD8295 AD8230 AD8231 AD8235 AD8236 AD8250 AD8251 AD8253 AD8553
Difference Amplifiers
Part Number CommonMode Voltage SOIC MSOP DIP Range (V) • • • • ±120 ±270 –VS – 0.4 to +VS + 0.4 –VS – 0.4 to +VS + 0.4 3 (–VS + 1.5) to 3 (+VS – 1.5) −2 (VS + 0.1) to +2 (VS − 1.5) −3 (VS + 0.1) to +3 (VS − 1.5) –12.3 to +12 • ±20 Package Bandwidth Typ (kHz)1 600 500 15,000 15,000 20,000 550 1000 15,000 3000 System Input Voltage Offset TC Max (������V/°C) 8 10 2 (typ) 2 (typ) 3 (typ) 2 1 7 — System Input Operating Supply Current Gain Drift CMRR DC to Temperature Voltage Offset Per Channel (ppm/°C) 1 kHz (dB) Min Supply Voltage Range (°C) (RTI) Max (������V) Max (V) Range Max (mA) 1500 500 1000 1000 700 200 100 500 400 5 10 10 2 10/2 1 1 1 — 75 86 76 80 77 86 80 86 80 ±2.25 to ±18, +4.5 to +36 ±2.5 to ±18 ±2.5 to ±18 ±2.5 to ±18 ±2.5 to ±18 ±2 to ±18, +2 to 36 ±2 to ±18, +2 to 36 3.3 to 15 ±5 to ±18 –40 to +85 –40 to +85 –40 to +85 –40 to +85 –40 to +85 –40 to +125 –40 to +125 –40 to +85 –55 to +125 1.6 1 2.5 2.6 2.5 0.2 0.2/0.175 2.3 3.5 Input Voltage Noise Density (f = 1 kHz) Typ (nV/√Hz) 300 550 38 38 26 65 47 40 — Gain Range Min to Max (V/V) 0.1 to 100 1 0.5, 1, 2 0.5, 1, 2 0.5, 2 1 0.5, 2 0.2 1 Gain Error Max (%) 0.1 0.03 0.08 0.02 0.05/0.03 0.02 0.02 0.024 0.008 Price @ 1k (OEM $U.S.)2 1.76 2.81 1.91 1.25 1.05/1.67 0.95/1.60 0.95/1.60 1.60 3.00 Comments
• • •
0.55, 0.48 0.085 0.75 1 1 2.1
• • • •
0.6 1.5 0.425 0.425 1 2.3
16-lead LFCSP • • • •
• • 16-lead LFCSP • 16-lead LFCSP 11-lead WLCSP • • • • • • • • • •
Gain Range Min to Max (V/V)
Gain Error @ G = 1 Max (%)
Price @ 1k (OEM $U.S.)1 3.27 4.20 2.48 1.38 2.53 2.29 1.99 4.06 3.59 1.15 4.12
Comments Most popular in-amp Precision gains of 10 and 100 Low cost, ±15 V in-amp Low cost in-amp Micropower, wide supply voltage range High input impedance JFET in MSOP package Highest performance in MSOP package Highest performance on the market High performance dual-channel or differential out Improved replacement for INA126 High performance JFET dual-channel or differential output Wide supply range, rail-to-rail output Wide supply range, rail-to-rail output
BRIDGE MEASUREMENT EXAMPLE
+VS R R R –IN R RG R R R1 R1 R1 +IN –VS REF R1 –IN
Make vs. Buy?
DISCRETE SOLUTIONS
OP AMP R R1 R2
ADI Full Signal Chain
ADI’s MONOLITHIC SOLUTIONS