Overview
The AD7228KR, produced by Analog Devices Inc., is a highly integrated digital-to-analog converter (DAC) chip. It contains eight 8-bit voltage mode DACs, each with output buffer amplifiers and interface logic, all on a single monolithic chip. This device is fabricated using an all ion implanted, high speed, linear-compatible CMOS (LC2MOS) process, which allows for the integration of high speed digital logic and precision analog circuits. The AD7228KR is designed to operate with either single or dual supplies, with specified performance guaranteed for input reference voltages from 2 V to 10 V. It features a common 8-bit data bus with individual DAC latches, making it versatile for interfacing with microprocessors.
Key Specifications
| Parameter | Specification |
|---|---|
| Number of DACs | Eight 8-bit DACs |
| Output Type | Voltage mode |
| Reference Voltage Range | 2 V to 10 V (dual supplies), 10 V (single supply) |
| Output Buffer Amplifier Capability | 10 V across a 2 kΩ load |
| Interface Compatibility | TTL/CMOS-compatible input port (5 V) |
| Address Inputs | A0, A1, A2 |
| Package Options | 24-Lead PDIP, CERDIP, SOIC; 28-Lead PLCC |
| Operating Temperature | Typically -40°C to +85°C |
Key Features
- Eight 8-bit DACs with output buffer amplifiers on a single chip, reducing board space and increasing reliability.
- No external trims required to achieve full specified performance.
- Operates with single or dual supplies, enhancing flexibility in system design.
- Common 8-bit data bus with individual DAC latches, providing a versatile control architecture compatible with most 8-bit microprocessors.
- Highly stable, thin film, R-2R ladder and high speed NMOS switches in each DAC.
- Compact packaging options including 24-Lead PDIP, CERDIP, SOIC, and 28-Lead PLCC.
Applications
- Digital Potentiometer Emulation: DACs can emulate digital potentiometers, providing digitally controlled variable resistances in circuits.
- Video Processing: Converts digital video signals into analog signals for display and transmission.
- Test and Measurement: Used in various test and measurement equipment where digital-to-analog conversion is necessary.
Q & A
- What is the AD7228KR?
The AD7228KR is an octal 8-bit digital-to-analog converter (DAC) chip produced by Analog Devices Inc.
- How many DACs does the AD7228KR contain?
The AD7228KR contains eight 8-bit DACs.
- What is the reference voltage range for the AD7228KR?
The reference voltage range is from 2 V to 10 V for dual supplies and 10 V for single supply operation.
- What types of packages are available for the AD7228KR?
The device is available in 24-Lead PDIP, CERDIP, SOIC, and 28-Lead PLCC packages.
- Is the AD7228KR compatible with microprocessors?
Yes, it is compatible with most 8-bit microprocessors due to its TTL/CMOS-compatible input port and speed-compatible control logic.
- What is the output capability of each DAC's buffer amplifier?
Each output buffer amplifier can develop 10 V across a 2 kΩ load.
- Does the AD7228KR require external trims?
No, external trims are not required to achieve the full specified performance.
- What are some common applications of the AD7228KR?
Common applications include digital potentiometer emulation, video processing, and test and measurement equipment.
- What is the fabrication process of the AD7228KR?
The device is fabricated using an all ion implanted, high speed, linear-compatible CMOS (LC2MOS) process.
- What is the typical operating temperature range of the AD7228KR?
The typical operating temperature range is -40°C to +85°C.
