Datasheet AD8270 (Analog Devices)

Precision Dual-Channel Difference Amplifier Data Sheet AD8270 FEATURES FUNCTIONAL BLOCK DIAGRAM B With no external resistors TA T S S +V OU OU –V Difference amplifier: gains of 0.5, 1, or 2 61 5 3 1 41 1 Single ended amplifiers: over 40 different gains Set reference voltage at midsupply Excellent ac specifications 10kΩ 10kΩ 10kΩ 10kΩ 15 MHz bandwidth –IN1A 1 12 –IN1B 30 V/μs slew rate 10kΩ 10kΩ _ _ High accuracy dc performance –IN2A 2 11 –IN2B 0.08% maximum gain error 10kΩ 10kΩ +IN2A 3 + + 10 +IN2B 10 ppm/°C maximum gain drift AD8270 80 dB minimum CMRR (G = 2) 10kΩ 10kΩ +IN1A 4 9 +IN1B Two channels in small 4 mm × 4 mm LFCSP Supply current: 2.5 mA per channel 20kΩ 20kΩ 20kΩ 20kΩ Supply range: ±2.5 V to ±18 V 5 6 7 8 APPLICATIONS
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1A 2A 2B 1B
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F F F F
979
Instrumentation amplifier building blocks RE RE RE RE
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Level translators
Figure 1.
Automatic test equipment High performance audio Sine/cosine encoders GENERAL DESCRIPTION
The AD8270 operates on both single and dual supplies and The AD8270 is a low distortion, dual-channel amplifier with requires only 2.5 mA maximum supply current for each ampli- internal gain setting resistors. With no external components, fier. It is specified over the industrial temperature range of it can be configured as a high performance difference amplifier −40°C to +85°C and is fully RoHS compliant. with gains of 0.5, 1, or 2. It can also be configured in over 40 single-
Table 1. Difference Amplifiers by Category
ended configurations, with gains ranging from −2 to +3.
High Single-Supply Single-Supply
The AD8270 is the first dual-difference amplifier in the small
High Speed Voltage Unidirectional Bidirectional
4 mm × 4 mm LFCSP. It requires the same board area as a typical AD8270 AD628 AD8202 AD8205 single-difference amplifier. The smaller package allows a 2× AD8273 AD629 AD8203 AD8206 increase in channel density and a lower cost per channel, all AMP03 AD8216 with no compromise in performance.
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Document Outline FEATURES APPLICATIONS FUNCTIONAL BLOCK DIAGRAM GENERAL DESCRIPTION TABLE OF CONTENTS REVISION HISTORY SPECIFICATIONS DIFFERENCE AMPLIFIER CONFIGURATIONS ABSOLUTE MAXIMUM RATINGS THERMAL RESISTANCE MAXIMUM POWER DISSIPATION ESD CAUTION PIN CONFIGURATION AND FUNCTION DESCRIPTIONS TYPICAL PERFORMANCE CHARACTERISTICS THEORY OF OPERATION CIRCUIT INFORMATION DC Performance AC Performance Production Costs Size DRIVING THE AD8270 PACKAGE CONSIDERATIONS POWER SUPPLIES INPUT VOLTAGE RANGE APPLICATIONS INFORMATION DIFFERENCE AMPLIFIER CONFIGURATIONS SINGLE-ENDED CONFIGURATIONS Gain of 1 Configuration DIFFERENTIAL OUTPUT DRIVING AN ADC DRIVING CABLING OUTLINE DIMENSIONS ORDERING GUIDE