PRODUCT DESCRIPTION

The AD526 is a single-ended, monolithic software program mable gain amplifier (SPGA) that provides gains of 1, 2, 4, 8 and 16. It is complete, including amplifier, resistor network and TTL-compatible latched inputs, and requires no external components.

Low gain error and low nonlinearity make the AD526 ideal for precision instrumentation applications requiring programmable gain. The small signal bandwidth is 350 kHz at a gain of 16. In addition, the AD526 provides excellent dc precision. The FET input stage results in a low bias current of 50 pA. A guaranteed maximum input offset voltage of 0.5 mV max (C grade) and low gain error (0.01%, G = 1, 2, 4, C grade) are accomplished using Analog Devices’ laser trimming technology.

FEATURES

Digitally Programmable Binary Gains from 1 to 16

Two-Chip Cascade Mode Achieves Binary Gain from 1 to 256

Gain Error:

   0.01% Max, Gain = 1, 2, 4 (C Grade)

   0.02% Max, Gain = 8, 16 (C Grade)

   0.5 ppm/8C Drift Over Temperature

Fast Settling Time

   10 V Signal Change:

      0.01% in 4.5 ms (Gain = 16)

   Gain Change:

      0.01% in 5.6 ms (Gain = 16)

Low Nonlinearity: 60.005% FSR Max (J Grade)

Excellent DC Accuracy:

   Offset Voltage: 0.5 mV Max (C Grade)

   Offset Voltage Drift: 3 mV/8C (C Grade)

TTL-Compatible Digital Inputs

APPLICATION HIGHLIGHTS

1. Dynamic Range Extension for ADC Systems: A single AD526 in conjunction with a 12-bit ADC can provide 96 dB of dynamic range for ADC systems.

2. Gain Ranging Preamps: The AD526 offers complete digital gain control with precise gains in binary steps from 1 to 16. Additional gains of 32, 64, 128 and 256 are possible by cas cading two AD526s.