AD620BRZ electronics ic chips Integrated Circuit Chip Low Cost Low Power Instrumentation Amplifier

Low Cost Low Power Instrumentation Amplifier AD620

FEATURES

Easy to use

Gain set with one external resistor

(Gain range 1 to 10,000)

Wide power supply range (±2.3 V to ±18 V)

Higher performance than 3 op amp IA designs

Available in 8-lead DIP and SOIC packaging

Low power, 1.3 mA max supply current

Excellent dc performance (B grade)

50 µV max, input offset voltage

0.6 µV/°C max, input offset drift

1.0 nA max, input bias current

100 dB min common-mode rejection ratio (G = 10)

Low noise

9 nV/√Hz @ 1 kHz, input voltage noise

0.28 µV p-p noise (0.1 Hz to 10 Hz)

Excellent ac specifications

120 kHz bandwidth (G = 100)

15 µs settling time to 0.01%

APPLICATIONS

Weigh scales

ECG and medical instrumentation

Transducer interface

Data acquisition systems

Industrial process controls

Battery-powered and portable equipment

PRODUCT DESCRIPTION

The AD620 is a low cost, high accuracy instrumentation amplifier that requires only one external resistor to set gains of 1 to 10,000. Furthermore, the AD620 features 8-lead SOIC and DIP packaging that is smaller than discrete designs and offers lower power (only 1.3 mA max supply current), making it a good fit for battery-powered, portable (or remote) applications.

The AD620, with its high accuracy of 40 ppm maximum nonlinearity, low offset voltage of 50 µV max, and offset drift of 0.6 µV/°C max, is ideal for use in precision data acquisition systems, such as weigh scales and transducer interfaces. Furthermore, the low noise, low input bias current, and low power of the AD620 make it well suited for medical applications, such as ECG and noninvasive blood pressure monitors.

The low input bias current of 1.0 nA max is made possible with the use of Superϐeta processing in the input stage. The AD620 works well as a preamplifier due to its low input voltage noise of 9 nV/√Hz at 1 kHz, 0.28 µV p-p in the 0.1 Hz to 10 Hz band, and 0.1 pA/√Hz input current noise. Also, the AD620 is well suited for multiplexed applications with its settling time of 15 µs to 0.01%, and its cost is low enough to enable designs with one in-amp per channel.

ABSOLUTE MAXIMUM RATINGS

1 Specification is for device in free air:

8-Lead Plastic Package: θJA = 95°C

8-Lead CERDIP Package: θJA = 110°C

8-Lead SOIC Package: θJA = 155°C

Stresses above those listed under Absolute Maximum Ratings may cause permanent damage to the device. This is a stress rating only; functional operation of the device at these or any other condition s above those indicated in the operational section of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.

Figure 1. 8-Lead PDIP (N), CERDIP (Q), and SOIC (R) Packages

Figure 2. Three Op Amp IA Designs vs. AD620 Figure 3. Total Voltage Noise vs. Source Resistance

OUTLINE DIMENSIONS

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