Features: `ULTRALOW NOISE PERFORMANCE
`2.9 nV/Hz at 10 kHz
`0.38 V p-p, 0.1 Hz to 10 Hz
`6.9 fA/Hz Current Noise at 1 kHz
`EXCELLENT AC PERFORMANCE
`12.5 Vs Slew Rate
`20 MHz Gain Bandwidth Product
`THD = 0.0002% @ 1 kHz
`Internally Compensated for Gains of +5 (or 4) or Greater
Application·Sonar
·Photodiode and IR Detector Amplifiers
·Accelerometers
·Low Noise Preamplifiers
·High Performance Audio
Pinout
Specifications
| -3dB Bandwidth |
20MHz |
| Slew Rate |
12.5V/s |
| Vos |
250V |
| Ib |
150pA |
| Input Noise (nV/rtHz) |
2.9nV/rtHz |
| Vcc-Vee Supply (V) |
9.6 to 36 |
| Iq per Amplifier |
10mA |
| # OpAmps per Pkg |
1 |
| Operating Temp Range |
0 to +70 |
| Packages |
DIP,SOIC |
Supply Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±18 V
Internal Power Dissipation2
SOIC Package . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.2 W
Input Voltage . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . ±VS
Output Short-Circuit Duration . . . . . . . . . . . . . . . . Indefinite
Differential Input Voltage . . . . . . . . . . . . . .. . . +VS and VS
Storage Temperature Range (R) . . . . . . 65°C to +125°C
Operating Temperature Range
AD745J/K . . . . . . . . . . . . . . . . . . . . . . . .. . 0°C to 70°C
Lead Temperature Range (Soldering 60 sec) . . . . . . 300°C
NOTES
216-Pin Plastic SOIC Package: JA = 100°C/W, JC = 30°C/W
DescriptionThe 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/s 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 AD745 also has excellent dc performance with 250 pA 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 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 two performance grades. The AD745J and AD745K are rated over the commercial temperature range of 0°C to 70°C, and are available in the 16-lead SOIC package.
AD745 Data Sheet
