Software Programmable Gain Amplifier AD526
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/؇C Drift Over Temperature Fast Settling Time 10 V Signal Change: 0.01% in 4.5 s (Gain = 16) Gain Change: 0.01% in 5.6 s (Gain = 16) Low Nonlinearity: ؎0.005% FSR max (J Grade) Excellent DC Accuracy: Offset Voltage: 0.5 mV max (C Grade) Offset Voltage Drift: 3 V/؇C (C Grade) TTL Compatible Digital Inputs
The AD526 is a singlended, 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.
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.
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 FETinput 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. The AD526 is offered in one commercial (0°C to +70°C) grade, J, and three industrial grades, A, B and C, which are specified from –40°C to +85°C. The S grade is specified from –55°C to +125°C. The military version is available processed to MILSTD 883B, Rev C. The J grade is supplied in a 16-pin plastic DIP, and the other grades are offered in a 16-pin hermetic sidebrazed ceramic DIP.
2. Gain Ranging Pre-Amps: 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.
ORDERING GUIDE Model AD526JN AD526AD AD526BD AD526CD AD526SD/883B 5962-9089401MEA*
Commercial Industrial Industrial Industrial Military
16-Pin Plastic DIP 16-Pin Cerdip 16-Pin Cerdip 16-Pin Cerdip
N-16 D-16 D-16
- Refer to official DESC drawing for tested specifications.
REV. C Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
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