Overview
The AD7537JR, produced by Analog Devices Inc., is a dual 12-bit current output Digital-to-Analog Converter (DAC) integrated into a single monolithic chip. This device features two independent 12-bit DACs, each with a separate reference input, which enhances thermal tracking and saves valuable board space. The AD7537JR is manufactured using the Linear Compatible CMOS (LC²MOS) process, making it compatible with most microprocessors and accepting TTL, 74HC, and 5V CMOS logic level inputs.
Key Specifications
| Parameter | Value | Notes |
|---|---|---|
| Number of Bits | 12 | Per DAC |
| Output Type | Current - Unbuffered | |
| Package/Case | 24-Lead SOIC (Wide) | |
| Reference Type | External | Separate reference input for each DAC |
| Operating Temperature | -40°C to +85°C | |
| Voltage - Supply, Analog/Digital | +12 V to +15 V (±10% tolerance) | |
| Settling Time | 1.5 µs | |
| INL/DNL (LSB) | ±1 (Max) | |
| Data Interface | Parallel | 2-byte (8 LSBs, 4 MSBs) loading structure |
Key Features
- Dual 12-Bit DACs in One Package: Saves valuable board space and ensures excellent thermal tracking.
- Space Saving Packages: Available in 24-pin DIP and 28-terminal surface mount packages.
- 4-Quadrant Multiplication: Supports four-quadrant multiplication with low gain error (1 LSB max over temperature).
- Byte Loading Structure: 2-byte (8 LSBs, 4 MSBs) loading structure designed for right-justified data format.
- Fast Interface Timing: Compatible with most microprocessors and accepts TTL, 74HC, and 5V CMOS logic level inputs.
- Asynchronous CLR Line: Useful in calibration routines; clears all registers when taken low.
- Double Buffering: Allows simultaneous update of both DACs.
- Separate AGND Lines: Increases device versatility; each DAC can be operated with AGND biased or in standard configuration.
Applications
- Automatic Test Equipment: Ideal for precision and reliability in testing environments.
- Programmable Filters: Used in filter applications requiring precise control over filter characteristics.
- Audio Applications: Suitable for audio systems where high precision and low distortion are critical.
- Synchro Applications: Used in synchro systems for precise angle and position measurement.
- Process Control: Employed in process control systems for accurate and reliable control of processes.
Q & A
- What is the resolution of the AD7537JR DACs?
The AD7537JR features two 12-bit DACs.
- What is the operating temperature range of the AD7537JR?
The operating temperature range is -40°C to +85°C.
- What type of output does the AD7537JR provide?
The AD7537JR provides current output.
- How many bytes are required to load data into the AD7537JR?
The AD7537JR uses a 2-byte (8 LSBs, 4 MSBs) loading structure.
- What is the purpose of the asynchronous CLR line on the AD7537JR?
The asynchronous CLR line clears all registers when taken low, which is useful in calibration routines.
- Can the AD7537JR be used with different logic levels?
Yes, it accepts TTL, 74HC, and 5V CMOS logic level inputs.
- What is the settling time of the AD7537JR?
The settling time is 1.5 µs.
- Does the AD7537JR have separate ground lines for each DAC?
Yes, each DAC has a separate AGND line.
- What are some common applications of the AD7537JR?
Common applications include automatic test equipment, programmable filters, audio applications, synchro applications, and process control.
- What is the power supply tolerance of the AD7537JR?
The device operates on a +12 V to +15 V VDD with ±10% tolerance.
