Datasheet AD745 (Analog Devices)

a
Ultralow Noise, High Speed, BiFET Op Amp AD745 FEATURES CONNECTION DIAGRAM ULTRALOW NOISE PERFORMANCE 2.9 nV/
冑
Hz at 10 kHz 16-Lead SOIC (R) Package 0.38 V p-p, 0.1 Hz to 10 Hz 6.9 fA/
冑
Hz Current Noise at 1 kHz EXCELLENT AC PERFORMANCE 12.5 V/ s Slew Rate 20 MHz Gain Bandwidth Product THD = 0.0002% @ 1 kHz Internally Compensated for Gains of +5 (or –4) or Greater EXCELLENT DC PERFORMANCE 0.5 mV Max Offset Voltage 250 pA Max Input Bias Current 2000 V/mV Min Open Loop Gain Available in Tape and Reel in Accordance with EIA-481A Standard APPLICATIONS
amplifier for high-speed applications demanding low noise and
Sonar
high dc precision. Furthermore, the AD745 does not exhibit an
Photodiode and IR Detector Amplifiers
output phase reversal.
Accelerometers Low Noise Preamplifiers
The AD745 also has excellent dc performance with 250 pA
High Performance Audio
maximum input bias current and 0.5 mV maximum offset voltage. The internal compensation of the AD745 is optimized for higher gains, providing a much higher bandwidth and a faster slew
PRODUCT DESCRIPTION
rate. This makes the AD745 especially useful as a preamplifier The AD745 is an ultralow noise, high-speed, FET input opera- where low level signals require an amplifier that provides both tional amplifier. It offers both the ultralow voltage noise and high amplification and wide bandwidth at these higher gains. high speed generally associated with bipolar input op amps and The AD745 is available in two performance grades. The AD745J the very low input currents of FET input devices. Its 20 MHz and AD745K are rated over the commercial temperature range bandwidth and 12.5 V/µs slew rate makes the AD745 an ideal of 0°C to 70°C, and are available in the 16-lead SOIC package.
1000 120 120 RSOURCE OP37 AND 100 100 EO RESISTOR PHASE 80 80 R 100 SOURCE dB – Degrees GE – nV/ Hz – A 60 60 T L GAIN O AD745 AND RESISTOR V AD745 AND OR RESISTOR 40 40 OP37 AND RESISTOR 10 OPEN-LOOP GAIN 20 20 PHASE MARGIN INPUT NOISE 0 0 RESISTOR NOISE ONLY 1 –20 –20 100 1k 10k 100k 1M 10M 100 1k 10k 100k 1M 10M 100M SOURCE RESISTANCE – FREQUENCY – Hz
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