Purchase AD645, In-stock AD645 From SeekIC.
Package Cooled:500
Part Number: AD645
Package Cooled: 500
Description: The AD645 is a low noise, precision FET input op amp. It offers the pico amp level input currents of a...
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AD645
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DataSheet
General Description
AD645 General Description
The AD645 is a low noise, precision FET input op amp. It offers the pico amp level input currents of a FET input device coupled with offset drift and input voltage noise comparable to a high performance bipolar input amplifier.
The AD645 has been improved to offer the lowest offset drift in a FET op amp, 1 µV/°C. Offset voltage drift is measured and trimmed at wafer level for the lowest cost possible. An inherently low noise architecture and advanced manufacturing techniques result in a device with a guaranteed low input voltage noise of 2 µV p-p, 0.1 Hz to 10 Hz. This level of dc performance along with low input currents make the AD645 an excellent choice for high impedance applications where stability is of prime concern.
The AD645 is available in six performance grades. The AD645J and AD645K are rated over the commercial temperature range of 0°C to +70°C. The AD645A, AD645B, and the ultraprecision AD645C are rated over the industrial temperature range of 40°C to +85°C. The AD645S is rated over the military temperature range of 55°C to +125°C and is available processed to MIL-STD-883B.
The AD645 is available in an 8-pin plastic mini-DIP, 8-pin header, or in die form.
AD645 Maximum Ratings
Supply Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .±18 V
Internal Power Dissipation2(@ TA = +25°C)
8-Pin Header Package . . . . . . . . . . . . . . . . . . . . . . 500 mW
8-Pin Mini-DIP Package . . . . . . . . . . . . . . . . . . . . . . 750 mW
Input Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±VS
Output Short Circuit Duration . . . . . . . . . . . . . . . . . .Indefinite
Differential Input Voltage . . . . . . . . . . . . . . . . . . . +VS and VS
Storage Temperature Range (H) . . . . . . . . . 65°C to +150°C
Storage Temperature Range (N) . . . . . . . . . 65°C to +125°C
Operating Temperature Range
AD645J/K . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0°C to +70°C
AD645A/B/C . . . . . . . . . . . . . . . . . . . . . . . . 40°C to +85°C
AD645S . . . . . . . . . . . . . . . . . . . . . . . . . . . 55°C to +125°C
Lead Temperature Range
(Soldering 60 sec) . . . . . . . . . . . . . . . . . . . . . . . . . . .+300°C
NOTES
1.Stresses above those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. This is a stress rating only and functional operation of the device at these or any other conditions above those indicated in the operational section of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.
2.Thermal Characteristics:
8-Pin Plastic Mini-DIP Package: JA = 100°C/Watt
8-Pin Header Package: JA = 200°C/Watt
Internal Power Dissipation2(@ TA = +25°C)
8-Pin Header Package . . . . . . . . . . . . . . . . . . . . . . 500 mW
8-Pin Mini-DIP Package . . . . . . . . . . . . . . . . . . . . . . 750 mW
Input Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±VS
Output Short Circuit Duration . . . . . . . . . . . . . . . . . .Indefinite
Differential Input Voltage . . . . . . . . . . . . . . . . . . . +VS and VS
Storage Temperature Range (H) . . . . . . . . . 65°C to +150°C
Storage Temperature Range (N) . . . . . . . . . 65°C to +125°C
Operating Temperature Range
AD645J/K . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0°C to +70°C
AD645A/B/C . . . . . . . . . . . . . . . . . . . . . . . . 40°C to +85°C
AD645S . . . . . . . . . . . . . . . . . . . . . . . . . . . 55°C to +125°C
Lead Temperature Range
(Soldering 60 sec) . . . . . . . . . . . . . . . . . . . . . . . . . . .+300°C
NOTES
1.Stresses above those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. This is a stress rating only and functional operation of the device at these or any other conditions above those indicated in the operational section of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.
2.Thermal Characteristics:
8-Pin Plastic Mini-DIP Package: JA = 100°C/Watt
8-Pin Header Package: JA = 200°C/Watt
AD645 Features
Improved Replacement for Burr-Brown
OPA-111 and OPA-121 Op Amp
LOW NOISE
2 mV p-p max, 0.1 Hz to 10 Hz
10 nV/Hz max at 10 kHz
11 fA p-p Current Noise 0.1 Hz to 10 Hz
HIGH DC ACCURACY
250 mV max Offset Voltage
1 mV/8C max Drift
1.5 pA max Input Bias Current
114 dB Open-Loop Gain
Available in Plastic Mini-DIP, 8-Pin Header Packages, or Chip Form
OPA-111 and OPA-121 Op Amp
LOW NOISE
2 mV p-p max, 0.1 Hz to 10 Hz
10 nV/Hz max at 10 kHz
11 fA p-p Current Noise 0.1 Hz to 10 Hz
HIGH DC ACCURACY
250 mV max Offset Voltage
1 mV/8C max Drift
1.5 pA max Input Bias Current
114 dB Open-Loop Gain
Available in Plastic Mini-DIP, 8-Pin Header Packages, or Chip Form
AD645 Connection Diagram
AD645
PDF/DataSheet Download
- Datasheet: AD645
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