Overview
The AD679AD is a 14-bit, 128 kSPS complete sampling analog-to-digital converter (ADC) produced by Analog Devices Inc. This monolithic ADC integrates a high-speed sample-and-hold amplifier (SHA), a microprocessor-compatible bus interface, a voltage reference, and clock generation circuitry on a single chip. It is designed to minimize external component requirements, providing a fully specified sampling A/D function that is unattainable with discrete designs. The AD679AD is fabricated using Analog Devices’ BiMOS process, combining low power CMOS logic with high precision, low noise bipolar circuits, and laser-trimmed thin-film resistors for high accuracy.
Key Specifications
| Parameter | Value |
|---|---|
| Resolution | 14 bits |
| Sampling Rate | 128 kSPS |
| Full Power Bandwidth | 1 MHz |
| Full Linear Bandwidth | 500 kHz |
| S/N+D Ratio | 78 dB (K, B, T Grades) |
| Data Format | Straight Binary (Unipolar), Twos Complement Binary (Bipolar) |
| Input Impedance | 10 MΩ |
| Input Range | 10 V Unipolar or Bipolar |
| Supply Voltage | +5 V, ±12 V |
| Power Dissipation | 560 mW (typ) |
| Package Options | 28-lead plastic DIP, ceramic DIP, 44 J-leaded ceramic surface-mount |
| Operating Temperature Range | -40°C to +85°C |
Key Features
- Complete integration of SHA, ADC, voltage reference, and clock generation on a single chip.
- High-speed conversions with 128 kSPS sampling rate.
- Full power bandwidth of 1 MHz and full linear bandwidth of 500 kHz.
- High input impedance (10 MΩ) allowing direct connection to unbuffered sources.
- Microprocessor-compatible bus interface with 8-bit bus.
- Data format options: straight binary for unipolar mode and twos complement binary for bipolar mode.
- Conversions can be initiated under microprocessor control or by an external clock asynchronous to the system clock.
- MIL-STD-883 compliant versions available.
Applications
- Signal processing applications requiring high S/N+D ratio, THD, and IMD specifications.
- Measurement applications where dc parameters such as accuracy and linearity are critical.
- Data acquisition systems in industrial, instrumentation, and military markets.
- High-performance mixed-signal ASICs and subsystems.
Q & A
- What is the resolution of the AD679AD ADC?
The AD679AD has a resolution of 14 bits.
- What is the sampling rate of the AD679AD?
The AD679AD has a sampling rate of 128 kSPS.
- What is the full power bandwidth of the AD679AD?
The full power bandwidth is 1 MHz.
- What are the data format options for the AD679AD?
The data format options are straight binary for unipolar mode and twos complement binary for bipolar mode.
- What is the input impedance of the AD679AD?
The input impedance is 10 MΩ.
- Can the AD679AD be used with unbuffered sources?
Yes, the high input impedance allows direct connection to unbuffered sources without signal degradation.
- How can conversions be initiated on the AD679AD?
Conversions can be initiated under microprocessor control or by an external clock asynchronous to the system clock.
- What are the supply voltage requirements for the AD679AD?
The AD679AD operates from +5 V and ±12 V supplies.
- What is the typical power dissipation of the AD679AD?
The typical power dissipation is 560 mW.
- Are MIL-STD-883 compliant versions of the AD679AD available?
Yes, MIL-STD-883 compliant versions are available.
