Software Programmable a Gain Amplifier AD526 FEATURES PIN CONFIGURATION Digitally Programmable Binary Gains from 1 to 16 Two-Chip Cascade Mode Achieves Binary Gain from 1 to 256 DIG GND 1 16 A1 Gain Error: NULL 2 15 A0 0.01% Max, Gain = 1, 2, 4 (C Grade) V 3 14 CS IN 0.02% Max, Gain = 8, 16 (C Grade) NULL 4 AD526 13 CLK 0.5 ppm/8C Drift Over Temperature TOP VIEW ANALOG GND 2 5 12 A2 (Not to Scale) Fast Settling Time ANALOG GND 1 6 11 B 10 V Signal Change: V +V 7 10 S S 0.01% in 4.5 ms (Gain = 16) V SENSE V FORCE 8 9 OUT OUT 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 PRODUCT DESCRIPTION APPLICATION HIGHLIGHTS The AD526 is a single-ended, monolithic software program- 1. Dynamic Range Extension for ADC Systems: A single mable gain amplifier (SPGA) that provides gains of 1, 2, 4, 8 AD526 in conjunction with a 12-bit ADC can provide and 16. It is complete, including amplifier, resistor network 96 dB of dynamic range for ADC systems. and TTL-compatible latched inputs, and requires no external components. 2. Gain Ranging Preamps: The AD526 offers complete digital Low gain error and low nonlinearity make the AD526 ideal for gain control with precise gains in binary steps from 1 to 16. precision instrumentation applications requiring programmable Additional gains of 32, 64, 128 and 256 are possible by cas- gain. The small signal bandwidth is 350 kHz at a gain of 16. In cading two AD526s. addition, the AD526 provides excellent dc precision. The FET- input stage results in a low bias current of 50 pA. A guaranteed ORDERING GUIDE 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 Temperature Package Package Model Range Descriptions Options Analog Devices laser trimming technology. To provide flexibility to the system designer, the AD526 can be AD526JN Commercial 16-Lead Plastic DIP N-16 AD526AD Industrial 16-Lead Cerdip D-16 operated in either latched or transparent mode. The force/sense AD526BD Industrial 16-Lead Cerdip D-16 configuration preserves accuracy when the output is connected AD526CD Industrial 16-Lead Cerdip D-16 to remote or low impedance loads. AD526SD Military 16-Lead Cerdip D-16 The AD526 is offered in one commercial (0 C to +70 C) grade, AD526SD/883B Military 16-Lead Cerdip D-16 J, and three industrial grades, A, B and C, which are specified 5962-9089401MEA* Military 16-Lead Cerdip D-16 from 40 C to +85 C. The S grade is specified from 55 C to *Refer to official DESC drawing for tested specifications. +125 C. The military version is available processed to MIL- STD 883B, Rev C. The J grade is supplied in a 16-lead plastic DIP, and the other grades are offered in a 16-lead hermetic side-brazed ceramic DIP. REV. D Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. use, nor for any infringements of patents or other rights of third parties Tel: 781/329-4700 World Wide Web Site: ( V = 615 V, R = 2 kV and T = +258C unless otherwise noted) AD526SPECIFICATIONS S L A AD526J AD526A AD526B/S AD526C Model Min Typ Max Min Typ Max Min Typ Max Min Typ Max Units GAIN Gain Range (Digitally Programmable) 1, 2, 4, 8, 16 1, 2, 4, 8, 16 1, 2, 4, 8, 16 1, 2, 4, 8, 16 Gain Error Gain = 1 0.05 0.02 0.01 0.01 % Gain = 2 0.05 0.03 0.02 0.01 % Gain = 4 0.10 0.03 0.02 0.01 % Gain = 8 0.15 0.07 0.04 0.02 % Gain = 16 0.15 0.07 0.04 0.02 % Gain Error Drift Over Temperature G = 1 0.5 2.0 0.5 2.0 0.5 2.0 0.5 2.0 ppm/ C G = 2 0.5 2.0 0.5 2.0 0.5 2.0 0.5 2.0 ppm/ C G = 4 0.5 3.0 0.5 3.0 0.5 3.0 0.5 3.0 ppm/ C G = 8 0.5 5.0 0.5 5.0 0.5 5.0 0.5 5.0 ppm/ C G = 16 1.0 5.0 1.0 5.0 1.0 5.0 1.0 5.0 ppm/ C to T ) Gain Error (T MIN MAX Gain = 1 0.06 0.03 0.02 0.015 % Gain = 2 0.06 0.04 0.03 0.015 % Gain = 4 0.12 0.04 0.03 0.015 % Gain = 8 0.17 0.08 0.05 0.03 % Gain = 16 0.17 0.08 0.05 0.03 % Nonlinearity Gain = 1 0.005 0.005 0.005 0.0035 % FSR Gain = 2 0.001 0.001 0.001 0.001 % FSR Gain = 4 0.001 0.001 0.001 0.001 % FSR Gain = 8 0.001 0.001 0.001 0.001 % FSR Gain = 16 0.001 0.001 0.001 0.001 % FSR Nonlinearity (T to T ) MIN MAX Gain = 1 0.01 0.01 0.01 0.007 % FSR Gain = 2 0.001 0.001 0.001 0.001 % FSR Gain = 4 0.001 0.001 0.001 0.001 % FSR Gain = 8 0.001 0.001 0.001 0.001 % FSR Gain = 16 0.001 0.001 0.001 0.001 % FSR VOLTAGE OFFSET, ALL GAINS Input Offset Voltage 0.4 1.5 0.25 0.7 0.25 0.5 0.25 0.5 mV Input Offset Voltage Drift Over Temperature 5 20 3 10 3 10 3 10 m V/ C Input Offset Voltage T to T 2.0 1.0 0.8 0.8 mV MIN MAX Input Offset Voltage vs. Supply (V 10%) 80 80 84 90 dB S INPUT BIAS CURRENT Over Input Voltage Range 10 V 50 150 50 150 50 150 50 150 pA ANALOG INPUT CHARACTERISTICS Voltage Range (Linear Operation) 610 12 610 12 610 12 610 12 V Capacitance 5555 pF RATED OUTPUT Voltage 610 12 610 12 610 12 610 12 V Current (V = 10 V) 10 65 10 65 10 65 10 mA OUT Short-Circuit Current 15 30 15 30 15 30 15 30 mA DC Output Resistance 0.002 0.002 0.002 0.002 W Load Capacitance (For Stable Operation) 700 700 700 700 pF 2 REV. 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