Overview
The AD7245AAP, produced by Analog Devices Inc., is a complete, 12-bit, voltage output digital-to-analog converter (DAC) integrated on a monolithic CMOS chip. This device features an on-chip output amplifier and a Zener voltage reference, eliminating the need for external trims to achieve full specified performance. The AD7245AAP is designed to operate from 12 V to 15 V supplies and is available in various packages, including 28-pin PLCC and SOIC.
This DAC is an enhanced version of the industry standard AD7245/AD7248, offering improvements such as ±1/2 LSB linearity grade, faster interface times, and better full scale and reference variations with VDD. It also supports extended temperature range operation for commercial and industrial grades.
Key Specifications
| Parameter | Value | Conditions |
|---|---|---|
| Resolution | 12 bits | |
| Supply Voltage | 12 V to 15 V | |
| Output Voltage Ranges | 0 V to +5 V, 0 V to +10 V (single supply), ±5 V (dual supply) | |
| Linearity Grade | ±1/2 LSB | |
| Settling Time | Typically 10 µs | |
| Interface Type | Parallel (12-bit wide data bus for AD7245A) | |
| Minimum Operating Temperature | -40°C | |
| Maximum Operating Temperature | +85°C | |
| Package Types | 28-pin PLCC, SOIC |
Key Features
- Microprocessor compatible with high-speed data latches and double-buffered interface logic.
- No external user trims required to achieve full specified performance.
- On-chip 5 V buried Zener diode provides a low noise, temperature-compensated reference.
- Extended temperature range operation for commercial and industrial grades.
- Asynchronous LDAC signal for transferring data from the input latch to the DAC latch.
- CLR signal on the DAC latch for features like power-on reset.
- 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 automation and control systems.
- Instrumentation and test equipment.
- Video and audio processing systems.
- Medical devices requiring precise analog output.
- Automotive and aerospace applications where high reliability is crucial.
Q & A
- What is the resolution of the AD7245AAP DAC?
The AD7245AAP has a 12-bit resolution.
- What are the available output voltage ranges for the AD7245AAP?
The output voltage ranges include 0 V to +5 V, 0 V to +10 V (single supply), and ±5 V (dual supply).
- What is the typical settling time of the AD7245AAP?
The typical settling time is 10 µs.
- Does the AD7245AAP require external trims for full performance?
No, the AD7245AAP does not require external trims to achieve full specified performance.
- What is the interface type of the AD7245AAP?
The AD7245AAP has a parallel interface with a 12-bit wide data bus.
- What are the operating temperature ranges for the AD7245AAP?
The operating temperature ranges are from -40°C to +85°C.
- What packages are available for the AD7245AAP?
The AD7245AAP is available in 28-pin PLCC and SOIC packages.
- Does the AD7245AAP have built-in reference and amplifier?
Yes, the AD7245AAP includes an on-chip output amplifier and a Zener voltage reference.
- How does the AD7245AAP handle data transfer from the input latch to the DAC latch?
Data is transferred from the input latch to the DAC latch via an asynchronous LDAC signal.
- What is the purpose of the CLR signal on the AD7245AAP?
The CLR signal allows features such as power-on reset to be implemented.
