Overview
The AD7628KP-REEL, produced by Analog Devices Inc., is a monolithic dual 8-bit digital-to-analog converter (DAC) known for its excellent DAC-to-DAC matching. This device is available in various packages, including 20-pin DIP, 20-terminal surface mount packages, and 20-lead PLCC (Plastic Leaded Chip Carrier).
The AD7628 features two identical 8-bit multiplying DACs, each consisting of a highly stable thin film R-2R ladder and eight N-channel current steering switches. This design ensures fixed currents in each ladder leg, independent of the switch state, and provides four-quadrant multiplication characteristics.
Key Specifications
| Specification | Value | Unit |
|---|---|---|
| Resolution | 8-bit | |
| Number of DACs | 2 | |
| Input High Voltage (VIH) | 2.4 | V |
| Input Low Voltage (VIL) | 0.8 | V |
| Input Current (IIN) | ±1 µA | |
| Input Capacitance (DB0–DB7) | 10 pF | |
| Input Capacitance (WR, CS, DACA/DACB) | 15 pF | |
| Chip Select to Write Set Up Time (tCS) | 160 ns | |
| Chip Select to Write Hold Time (tCH) | 10 ns | |
| Operating Temperature Range (Commercial) | –40°C to +85°C | |
| Operating Temperature Range (Industrial) | –40°C to +85°C | |
| Operating Temperature Range (Extended) | –55°C to +125°C | |
| Power Supply Voltage | +12 V to +15 V | |
| Power Dissipation | 20 mW |
Key Features
- Excellent DAC-to-DAC matching
- Two identical 8-bit multiplying DACs with R-2R ladder structure
- Four-quadrant multiplication characteristics with separate reference input and feedback resistor for each DAC
- Separate on-chip latches for each DAC for easy microprocessor interface
- TTL/CMOS compatible input port
- Bus compatible with most 8-bit microprocessors (e.g., 6502, 6809, 8085, Z80)
- Low power dissipation of 20 mW
- Available in 20-pin DIP, 20-terminal surface mount packages, and 20-lead PLCC
Applications
The AD7628 is suitable for various applications requiring precise digital-to-analog conversion, such as:
- Industrial control systems
- Automotive systems
- Aerospace and defense systems
- Medical devices
- Test and measurement equipment
Q & A
- What is the resolution of the AD7628 DAC?
The AD7628 has a resolution of 8 bits.
- How many DACs are included in the AD7628?
The AD7628 includes two identical 8-bit DACs.
- What is the operating temperature range for the AD7628?
The operating temperature range is –40°C to +85°C for commercial and industrial grades, and –55°C to +125°C for extended grades.
- What is the power supply voltage for the AD7628?
The AD7628 operates from a +12 V to +15 V power supply.
- Is the AD7628 compatible with microprocessors?
Yes, it is bus compatible with most 8-bit microprocessors such as 6502, 6809, 8085, and Z80.
- What is the power dissipation of the AD7628?
The power dissipation is 20 mW.
- In what packages is the AD7628 available?
The AD7628 is available in 20-pin DIP, 20-terminal surface mount packages, and 20-lead PLCC.
- Does the AD7628 support four-quadrant multiplication?
Yes, it supports four-quadrant multiplication with separate reference input and feedback resistor for each DAC.
- What is the input high voltage (VIH) for the AD7628?
The input high voltage (VIH) is 2.4 V.
- What is the input low voltage (VIL) for the AD7628?
The input low voltage (VIL) is 0.8 V.
