Overview
The AD625AD, produced by Analog Devices Inc., is a precision instrumentation amplifier designed to meet the needs of circuits requiring nonstandard gains and low-cost, precision software programmable gain amplifiers. This amplifier is part of the AD625 series, which offers high precision and flexibility in gain settings. The AD625AD is particularly useful in applications where gains between 1 and 10,000 are required, and it can be programmed using three external resistors. It features excellent ac performance, low noise, and high common-mode rejection ratio (CMRR), making it suitable for a wide range of precision instrumentation applications.
Key Specifications
| Parameter | Min | Typ | Max |
|---|---|---|---|
| Gain Range | 1 | - | 10,000 |
| Gain Error | - | - | 0.02% Max |
| Gain Temperature Coefficient (TC) | - | - | 5 ppm/°C Max |
| Nonlinearity | - | - | 0.001% Max |
| Input Offset Voltage | - | - | 25 µV |
| Input Offset Voltage Drift (AD625C) | - | - | 0.25 µV/°C |
| Noise (at 1 kHz) | - | - | 4 nV/√Hz |
| Gain Bandwidth Product | - | - | 25 MHz |
| Slew Rate | - | - | 5 V/µs |
| Settling Time to 0.01% (20 V Step) | - | - | 15 µs (G = 1 to 200), 35 µs (G = 500), 75 µs (G = 1000) |
| Power Supply Range | ±6 V | - | ±18 V |
| Quiescent Current | 3.5 mA | 5 mA | - |
| Operating Temperature Range | -40°C (A, B, C Grades) | - | +85°C (A, B, C Grades), +70°C (J, K Grades), +125°C (S Grade) |
| Package Types | - | - | 16-Lead Ceramic or Plastic DIP, 20-Terminal LCC |
Key Features
- User-programmed gains of 1 to 10,000 using three external resistors.
- Low gain error and gain temperature coefficient (TC): 0.02% max and 5 ppm/°C max, respectively.
- Low nonlinearity: 0.001% max.
- Low input offset voltage: 25 µV, with drift as low as 0.25 µV/°C for the AD625C grade.
- Low noise: 4 nV/√Hz at 1 kHz.
- High gain bandwidth product: 25 MHz.
- Fast slew rate: 5 V/µs.
- Quick settling time: 15 µs to 0.01% for gains up to 200.
- Totally independent input and output offset nulling terminals for high precision applications.
- Available in various temperature grades: industrial (-40°C to +85°C), commercial (0°C to +70°C), and extended (-55°C to +125°C).
- MIL-Standard parts available.
Applications
- Precision instrumentation and measurement systems.
- Data acquisition systems.
- Industrial process controls.
- Medical instrumentation, such as ECG and other diagnostic equipment.
- Transducer interfaces.
- Weigh scales and other precision weighing applications.
- Battery-powered and portable equipment.
Q & A
- What is the gain range of the AD625AD?
The AD625AD can be programmed for gains between 1 and 10,000 using three external resistors.
- What is the maximum gain error of the AD625AD?
The maximum gain error is 0.02%.
- What is the input offset voltage of the AD625AD?
The input offset voltage is 25 µV, with a drift as low as 0.25 µV/°C for the AD625C grade.
- What is the noise level of the AD625AD at 1 kHz?
The noise level is 4 nV/√Hz at 1 kHz.
- What is the gain bandwidth product of the AD625AD?
The gain bandwidth product is 25 MHz.
- What are the available package types for the AD625AD?
The AD625AD is available in 16-Lead Ceramic or Plastic DIP and 20-Terminal LCC packages.
- What are the operating temperature ranges for the AD625AD?
The operating temperature ranges are -40°C to +85°C for industrial grades, 0°C to +70°C for commercial grades, and -55°C to +125°C for the extended temperature grade.
- Can the AD625AD be used in MIL-Standard applications?
- How does the AD625AD handle offset voltage in gain-ranging applications?
The AD625AD provides totally independent input and output offset nulling terminals to minimize the effects of offset voltage.
- What is the slew rate of the AD625AD?
The slew rate is 5 V/µs.
