AD526 Gain Amplifier

AD526 Digitally Programmable Gain Amplifier

The AD526 is a single-ended, monolithic software programmable 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 non-linearity make the AD526 ideal for precision instrumentation applications requiring digitally 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.
To provide flexibility to the system designer, the AD526 can be operated in either latched or transparent mode. The force/sense configuration preserves accuracy when the output is connected to remote or low impedance loads.

Features of AD526

• 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
                0.01% in 4.5 ms (Gain = 16)
                Offset Voltage Drift : 3 mV/8C (C Grade)

• Fast Settling Time

                10 V Signal Change :

• Gain Change :

                0.01% in 5.6 ms (Gain = 16)

• Low Nonlinearity  : 60.005% FSR Max (J Grade)

• Excellent DC Accurac :

                Offset Voltage : 0.5 mV Max (C Grade)

• TTL-Compatible Digital Inputs

Applications of AD526

• 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.

• 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 cascading two AD526s.