Overview
The AD7224KRZ-18 is a precision 8-bit, voltage-output, digital-to-analog converter (DAC) produced by Analog Devices Inc. This device features an output amplifier and double-buffered interface logic on a monolithic CMOS chip. It is designed to integrate high-speed digital logic and precision analog circuits, making it suitable for a variety of applications requiring accurate analog output from digital inputs. The AD7224 does not require external trims to achieve its full specified performance, and it is fabricated using an all ion-implanted high-speed Linear Compatible CMOS (LC2MOS) process.
Key Specifications
| Parameter | Value | Conditions/Comments |
|---|---|---|
| Resolution | 8 Bits | |
| Total Unadjusted Error | ±2 LSB max | VDD = +15 V ± 5%, VREF = +10 V |
| Relative Accuracy | ±1/2 LSB max | |
| Differential Nonlinearity | ±1 LSB max | |
| Full-Scale Error | ±3/2 LSB max | |
| Full-Scale Temperature Coefficient | ±20 ppm/°C max | @ 25°C |
| Settling Time | 20 µs | |
| Operating Temperature | -40°C to +85°C | |
| Supply Voltage (Digital) | 14.25 V ~ 15.75 V | |
| Supply Voltage (Analog) | 11.4 V ~ 16.5 V, ±5V | |
| Reference Type | External | |
| Package/Case | 18-Lead SOIC (Wide) | |
| Output Type | Voltage - Buffered |
Key Features
- Double Buffered Interface Logic: The AD7224 features two 8-bit registers—an input register and a DAC register—allowing for simultaneous updates in systems with multiple AD7224s.
- No External Trims Required: The device achieves full specified performance without the need for external trims.
- High-Speed CMOS Process: Fabricated using an all ion-implanted high-speed Linear Compatible CMOS (LC2MOS) process, enabling the integration of high-speed digital logic and precision analog circuits.
- TTL and CMOS Compatibility: All logic inputs are TTL and CMOS (5V) level compatible, and the control logic is speed compatible with most 8-bit microprocessors.
- Output Amplifier Capability: The output amplifier can develop +10V across a 2 kΩ load.
- Reference Voltage Flexibility: Specified performance is guaranteed for input reference voltages from +2V to +12.5V when using dual supplies, and for single supply operation using a reference of +10V.
Applications
- Industrial Control Systems: The AD7224 is suitable for applications requiring precise analog outputs in industrial control environments.
- Medical Equipment: Its high accuracy and stability make it a good fit for medical devices that require reliable analog signal conversion.
- Aerospace and Defense: The device's robust specifications and wide operating temperature range make it suitable for use in aerospace and defense applications.
- Automotive Systems: It can be used in automotive systems that require precise analog signal conversion, such as in engine control units or other automotive electronics.
- Test and Measurement Equipment: The AD7224's precision and stability are beneficial in test and measurement equipment where accurate analog outputs are critical.
Q & A
- What is the resolution of the AD7224?
The AD7224 has a resolution of 8 bits.
- What is the total unadjusted error of the AD7224?
The total unadjusted error is ±2 LSB max when VDD = +15 V ± 5% and VREF = +10 V.
- Is the AD7224 compatible with TTL and CMOS logic levels?
- What is the settling time of the AD7224?
The settling time of the AD7224 is 20 µs.
- What are the operating temperature ranges for the AD7224?
The operating temperature range is -40°C to +85°C.
- Can the AD7224 operate with a single supply voltage?
- What is the output type of the AD7224?
The output type is voltage-buffered.
- What is the package type for the AD7224KRZ-18?
The package type for the AD7224KRZ-18 is 18-Lead SOIC (Wide).
- Does the AD7224 require external trims for full performance?
- What is the maximum voltage the output amplifier can develop across a load?
The output amplifier can develop +10V across a 2 kΩ load.
