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Ultralow Noise, High Speed, BiFET Op Amp AD745

FEATURES ULTRALOW NOISE PERFORMANCE 2.9 nV/͙Hz at 10 kHz 0.38 ␮V p, 0.1 Hz to 10 Hz 6.9 fA/͙Hz Current Noise at 1 kHz

CONNECTION DIAGRAMS 8-Pin Plastic Mini-DIP (N) & 8-Pin Cerdip (Q) Packages

NC 1 OFFSET NULL 1

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

– IN 2

AD745

7

+IN 3

TOP VIEW

6 OUTPUT

–VS 4

5

OFFSET NULL

16 NC

AD745

2 3

NC 4 +IN

13 +VS

5

12 OUTPUT

–VS 6 NC

15 NC 14 NC

11

7

TOP VIEW

OFFSET NULL

10 NC 9 NC

The AD745’s guaranteed, tested maximum input voltage noise of 4 nV/√Hz at 10 kHz is unsurpassed for a FET-input monolithic op amp, as is its maximum 1.0 µV p noise in a 0.1 Hz to 10 Hz bandwidth. The AD745 also has excellent dc performance with 250 pA maximum input bias current and 0.5 mV maximum offset voltage.

PRODUCT DESCRIPTION

The AD745 is an ultralow noise, high speed, FET input operational amplifier. It offers both the ultralow voltage noise and high speed generally associated with bipolar input op amps and the very low input currents of FET input devices. Its 20 MHz bandwidth and 12.5 V/µs slew rate makes the AD745 an ideal amplifier for high speed applications demanding low noise and high dc precision. Furthermore, the AD745 does not exhibit an output phase reversal.

The internal compensation of the AD745 is optimized for higher gains, providing a much higher bandwidth and a faster slew rate. This makes the AD745 especially useful as a preamplifier where low level signals require an amplifier that provides both high amplification and wide bandwidth at these higher gains. The AD745 is available in five performance grades. The AD745J and AD745K are rated over the commercial temperature range of 0°C to +70°C. The AD745A and AD745B are rated over the industrial temperature range of –40°C to +85°C. The AD745S is rated over the military temperature range of –55°C to +125°C and is available processed to MIL-STD-883B, Rev. C. The AD745 is available in 8-pin plastic mini-DIP, 8-pin cerdip, 16-pin SOIC, or in chip form.

R SOURCE

OP37 & RESISTOR (—)

EO

120

R SOURCE

120 100

100

AD745 & RESISTOR OR OP37 & RESISTOR

OPEN-LOOP GAIN – dB

100

AD745 + RESISTOR ( )

10

RESISTOR NOISE ONLY (– – –)

PHASE 80

80

60

60 GAIN

40

40

20

20 0

0 1k

10k

100k

1M

PHASE MARGIN – Degrees

1000

INPUT NOISE VOLTAGE – nV/ Hz

+VS

OFFSET NULL – IN

NC 8

APPLICATIONS Sonar Photodiode and IR Detector Amplifiers Accelerometers Low Noise Preamplifiers High Performance Audio

REV. C

8 NC

NC = NO CONNECT

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

1 100

16-Pin SOIC (R) Package

10M

SOURCE RESISTANCE – Ω

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.

–20 100

1k

10k 100k 1M FREQUENCY – Hz

–20 10M 100M

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 617/329-4700 Fax: 617/326-8703


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