Overview
The AD845SQ/883B is a high-performance, N-channel JFET input, monolithic operational amplifier produced by Analog Devices Inc. Fabricated using Analog Devices' complementary bipolar (CB) process, this amplifier is renowned for its fast and precise operation. The AD845SQ/883B benefits from advanced laser-wafer trimming technology, which enables very low input offset voltage and offset voltage drift, making it ideal for high-speed applications requiring 12-bit accuracy.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Input Offset Voltage | 0.1 | 0.25 | 1.0 | mV |
| Offset Voltage Drift | 5.0 | 10 | - | mV/°C |
| Input Bias Current | 0.5 | 1 | 2 | nA |
| Input Offset Current | 15 | 100 | 300 | pA |
| Input Resistance | 10^11 | - | - | Ω |
| Input Capacitance | 4.0 | - | - | pF |
| Differential Input Voltage Range | ±20 | - | - | V |
| Common-Mode Input Voltage Range | ±10 | - | - | V |
| Common-Mode Rejection Ratio (CMRR) | 86 | 110 | - | dB |
| Slew Rate | 80 | 100 | - | V/ms |
| Settling Time (10 V Step, CLOAD = 100 pF, RLOAD = 500 Ω) | 350 | - | - | ns to 0.01% |
| Unity Gain Bandwidth | 12.8 | - | - | MHz |
| Full Power Bandwidth at 20 V p-p | 1.75 | - | - | MHz |
| Power Supply Rated Performance | ±15 | - | - | V |
| Operating Temperature Range | -55 to +125 | - | - | °C |
Key Features
- High slew rate of 100 V/ms and fast settling time of 350 ns to 0.01% for high-speed applications.
- Low input offset voltage of 0.25 mV max and low offset voltage drift of 5 μV/°C.
- Low input bias current of 0.5 nA and low input offset current of 15 pA.
- High common-mode rejection ratio (CMRR) of 110 dB.
- Unity gain bandwidth of 12.8 MHz and full power bandwidth of 1.75 MHz at 20 V p-p.
- Available in various packages including plastic mini-DIP, hermetic CERDIP, and SOIC, with options for tape and reel.
- Ideal for upgrading existing designs using BiFET or FET input hybrid amplifiers and some bipolar input op amps.
Applications
- Active filters
- High-speed integrators
- Photodiode preamps
- Sample-and-hold amplifiers
- Log amplifiers
- Buffering A/D and D/A converters
Q & A
- What is the input offset voltage of the AD845SQ/883B?
The input offset voltage is 0.25 mV max.
- What is the slew rate of the AD845SQ/883B?
The slew rate is 100 V/ms.
- What is the settling time of the AD845SQ/883B for a 10 V step?
The settling time is 350 ns to 0.01% for a 10 V step with a load of 100 pF and 500 Ω.
- What is the unity gain bandwidth of the AD845SQ/883B?
The unity gain bandwidth is 12.8 MHz.
- What are the common package types available for the AD845SQ/883B?
The AD845SQ/883B is available in plastic mini-DIP, hermetic CERDIP, and SOIC packages, with options for tape and reel.
- What are some typical applications of the AD845SQ/883B?
Typical applications include active filters, high-speed integrators, photodiode preamps, sample-and-hold amplifiers, log amplifiers, and buffering A/D and D/A converters.
- What is the operating temperature range for the AD845SQ/883B?
The operating temperature range is -55°C to +125°C for the military-grade version.
- What is the common-mode rejection ratio (CMRR) of the AD845SQ/883B?
The CMRR is 110 dB over a ±10 V input voltage range.
- How does the AD845SQ/883B compare to other FET input op amps?
The AD845SQ/883B offers a combination of high slew rate, fast settling time, and DC precision that is unmatched by many other FET input op amps, making it ideal for high-speed applications requiring 12-bit accuracy.
- What technology is used to fabricate the AD845SQ/883B?
The AD845SQ/883B is fabricated using Analog Devices' complementary bipolar (CB) process.
