Datasheet AD8275 (Analog Devices)

G = 0.2, Level Translation, 16-Bit ADC Driver Data Sheet AD8275 FEATURES PIN CONFIGURATION Translates ±10 V to +4 V REF1 1 8 REF2 Drives 16-bit SAR ADCs –IN AD8275 2 7 +VS TOP VIEW Small MSOP package +IN 3 6 OUT
1
(Not to Scale)
6-00
–V 5 SENSE Input overvoltage: +40 V to −35 V (V S 4
54
S = 5 V)
07
Fast settling time: 450 ns to 0.001%
Figure 1.
Rail-to-rail output TYPICAL APPLICATION Wide supply operation: +3.3 V to +15 V +5V High CMRR: 80 dB 0.1µF 0.1µF Low gain drift: 1 ppm/°C 7 +4.048V Low offset drift: 2.5 μV/°C +VS +2.048V +10V 50kΩ 10kΩ +0.048V 2 5 APPLICATIONS –IN SENSE 33Ω VDD IN+ Level translator OUT 6 AD7685 2.7nF ADC driver IN–REF GND Instrumentation amplifier building block 50kΩ 20kΩ VIN 3 8 –10V Automated test equipment +IN REF2 20kΩ VREF 1 4.096V REF1 10µF AD8275 –VS 4
002 6- 0754 Figure 2. Translating ±10 V to 4.096 V ADC Full Scale
GENERAL DESCRIPTION
The AD8275 is a G = 0.2 difference amplifier that can be used The AD8275 can be used as an analog front end, or it can follow to translate ±10 V signals to a +4 V level. It solves the problem buffers to level translate high voltages to a voltage range accepted typically encountered in industrial and instrumentation applic- by the ADC. In addition, the AD8275 can be configured for ations where ±10 V signals must be interfaced to a single-supply differential outputs if used with a differential ADC. 4 V or 5 V ADC. The AD8275 interfaces the two signal levels, The AD8275 is available in a space-saving, 8-lead MSOP simplifying design. and is specified for performance over the −40°C to +85°C The AD8275 has fast settling time of 450 ns and low distortion, temperature range. making it suitable for driving medium speed successive approx- imation (SAR) ADCs. Its wide input voltage range and rail-to-
Table 1. Difference Amplifiers by Category
rail outputs make it an easy to use building block. Single-supply
Single-Supply
operation reduces the power consumption of the amplifier and
Low Distortion High Voltage Current Sense
helps to protect the ADC from overdrive conditions. AD8270 AD628 AD8202 AD8273 AD629 AD8203 Internal, matched, precision laser-trimmed resistors ensure AD8274 AD8205 low gain error, low gain drift of 1 ppm/°C (maximum), and AD8275 AD8206 high common-mode rejection of 80 dB. Low offset and low AMP03 AD8216 offset drift, combined with its fast settling time, make the AD8275 suitable for a variety of data acquisition applications where accurate and quick capture is required.
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Document Outline Features Applications Pin Configuration Typical Application General Description Revision History Specifications Absolute Maximum Ratings Maximum Power Dissipation ESD Caution Pin Configuration and Function Descriptions Typical Performance Characteristics Theory of Operation Basic Connection Power Supplies Reference Common-Mode Input Voltage Range Input Protection Configurations Applications Information Driving a Single-Ended ADC Differential Outputs Increasing Input Impedance AC Coupling Using the AD8275 as a Level Translator in a Data Acquisition System Outline Dimensions Ordering Guide