Overview
The AD774BJN is a 12-bit successive-approximation analog-to-digital converter (ADC) produced by Analog Devices Inc. This device is part of the AD774B series, which offers high precision and speed. The AD774BJN is designed to be pin-compatible with the industry-standard AD574A but provides faster conversion times and lower power consumption. It features a monolithic design using Analog Devices’ BiMOS II process, combining high-performance bipolar analog circuitry with digital CMOS logic. The device includes a high-precision voltage reference and clock on-chip, making it a comprehensive solution for various data acquisition applications.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Resolution | 12 bits | |
| Conversion Time | 8 µs (maximum) | |
| Input Ranges | 0 V to 10 V, 0 V to 20 V (unipolar); –5 V to +5 V, –10 V to +10 V (bipolar) | |
| Power Supplies | +5 V and ±12 V or ±15 V | |
| Operating Temperature Range | 0°C to 70°C | |
| Package Type | 28-lead Plastic DIP | |
| Accuracy | ±1 LSB |
Key Features
- Industry-standard pinout compatible with AD574A
- High-precision voltage reference and clock on-chip
- Flexible digital interface with three-state output buffers for direct connection to 8- and 16-bit microprocessor buses
- Active laser trimming of thin-film resistors for minimized offset, linearity, and scaling errors
- Multiple calibrated input ranges: 0 V to 10 V, 0 V to 20 V (unipolar); –5 V to +5 V, –10 V to +10 V (bipolar)
- Low power consumption
Applications
- Data acquisition systems
- Industrial control systems
- Medical devices requiring high precision ADCs
- Aerospace and defense applications where high reliability is crucial
- Automotive systems needing robust and accurate ADCs
Q & A
- What is the resolution of the AD774BJN ADC?
The AD774BJN has a resolution of 12 bits.
- What is the maximum conversion time of the AD774BJN?
The maximum conversion time is 8 µs.
- What are the input voltage ranges for the AD774BJN?
The input voltage ranges are 0 V to 10 V, 0 V to 20 V (unipolar); –5 V to +5 V, –10 V to +10 V (bipolar).
- What power supplies are required for the AD774BJN?
The device operates on +5 V and ±12 V or ±15 V power supplies.
- What is the operating temperature range of the AD774BJN?
The operating temperature range is 0°C to 70°C.
- What type of package is the AD774BJN available in?
The AD774BJN is available in a 28-lead Plastic DIP package.
- How accurate is the AD774BJN?
The accuracy is ±1 LSB.
- Is the AD774BJN compatible with other industry-standard ADCs?
Yes, it is pin-compatible with the industry-standard AD574A.
- What is the significance of the BiMOS II process used in the AD774BJN?
The BiMOS II process allows for the combination of high-performance bipolar analog circuitry with digital CMOS logic on the same die.
- Why is laser trimming of thin-film resistors important in the AD774BJN?
Laser trimming minimizes offset, linearity, and scaling errors.
