Overview
The AD7245JNZ, produced by Analog Devices Inc., is an enhanced version of the industry-standard AD7245/AD7248 digital-to-analog converters (DACs). This component is a complete, 12-bit, voltage output DAC with an integrated output amplifier and a Zener voltage reference on a monolithic CMOS chip. It operates from 12 V to 15 V supplies and features improved linearity, faster interface times, and better full-scale and reference variations compared to its predecessors. The AD7245JNZ is microprocessor compatible, with high-speed data latches and double-buffered interface logic, making it suitable for a wide range of applications requiring precise digital-to-analog conversion.
Key Specifications
| Parameter | Value | Unit | Conditions |
|---|---|---|---|
| Resolution | 12 bits | ||
| Supply Voltage | 12 V to 15 V | V | |
| Output Voltage Ranges | 0 V to +5 V, 0 V to +10 V, ±5 V | V | Single and dual supplies |
| Linearity Grade | ±1/2 LSB | ||
| Temperature Range | Commercial and industrial grades | ||
| Chip Select Pulsewidth | 80 ns min | ns | TMIN to TMAX |
| Write Pulsewidth | 80 ns min | ns | TMIN to TMAX |
| Data Valid to Write Setup Time | 40 ns typ | ns | @ 25°C |
| Load DAC Pulsewidth | 40 ns typ | ns | @ 25°C |
| Package Types | 24-Lead PDIP, 28-Lead PLCC, 24-Lead SOIC (Wide), 24-Lead CerDIP (Narrow 0.3 Inch) |
Key Features
- 12-bit parallel data input with double-buffered interface logic.
- On-chip 5 V buried Zener diode providing a low noise, temperature-compensated reference.
- High-speed data latches and asynchronous LDAC signal for transferring data from the input latch to the DAC latch.
- CLR signal for power-on reset and other features.
- Output amplifiers capable of developing +10 V across a 2 kΩ load to GND.
- Fabricated in linear compatible CMOS (LC²MOS) process combining precision bipolar circuits with low power CMOS logic.
- Low digital feedthrough of 10 nV-s in a 5 V output range.
- Internal input protection of all logic inputs via on-chip distributed diodes.
Applications
- Industrial control systems requiring precise analog outputs.
- Medical devices needing accurate voltage control.
- Aerospace and defense applications where reliability and precision are critical.
- Automotive systems for various control and monitoring functions.
- Test and measurement equipment requiring high-resolution DACs.
Q & A
- What is the resolution of the AD7245JNZ DAC?
The AD7245JNZ has a 12-bit resolution.
- What are the available output voltage ranges for the AD7245JNZ?
The output voltage ranges include 0 V to +5 V, 0 V to +10 V, and ±5 V, depending on the supply configuration.
- What is the temperature range for the AD7245JNZ?
The AD7245JNZ operates over commercial and industrial temperature ranges.
- How does the AD7245JNZ achieve its reference voltage?
The AD7245JNZ uses an on-chip 5 V buried Zener diode to provide a low noise, temperature-compensated reference voltage.
- What are the package options available for the AD7245JNZ?
The AD7245JNZ is available in 24-Lead PDIP, 28-Lead PLCC, 24-Lead SOIC (Wide), and 24-Lead CerDIP (Narrow 0.3 Inch) packages.
- How does the AD7245JNZ handle data transfer?
The AD7245JNZ uses an asynchronous LDAC signal to transfer data from the input latch to the DAC latch, and it has a CLR signal for power-on reset and other features.
- What is the significance of the LC²MOS process in the AD7245JNZ?
The LC²MOS process combines precision bipolar circuits with low power CMOS logic, enhancing the overall performance and reliability of the DAC.
- How does the AD7245JNZ protect its logic inputs?
The AD7245JNZ features internal input protection of all logic inputs via on-chip distributed diodes.
- What is the digital feedthrough characteristic of the AD7245JNZ?
The AD7245JNZ has a low digital feedthrough of 10 nV-s in a 5 V output range.
- Is the AD7245JNZ microprocessor compatible?
Yes, the AD7245JNZ is microprocessor compatible with high-speed data latches and double-buffered interface logic.
