Overview
The AD679JD 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. This integration minimizes the need for external components, providing a fully specified sampling A/D function that is not achievable with discrete designs. The AD679JD 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 and ±12 V |
| Power Dissipation | 560 mW (typ) |
| Package | 28-Pin Ceramic DIP |
| Operating Temperature | 0°C to +70°C |
Key Features
- Complete integration of SHA, ADC, voltage reference, and clock generation on a single chip.
- High-speed conversions at 128 kSPS with full power bandwidth of 1 MHz and full linear bandwidth of 500 kHz.
- High input impedance (10 MΩ) allowing direct connection to unbuffered sources without signal degradation.
- Microprocessor-compatible bus interface with 8-bit bus.
- Data format in 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.
- Pin compatible with AD678 12-bit, 200 kSPS ADC.
Applications
The AD679JD is suitable for various signal processing and measurement applications, including:
- Industrial and instrumentation systems requiring high accuracy and speed.
- Military and aerospace applications due to its MIL-STD-883 compliance.
- Data acquisition systems where high-speed sampling and precise conversion are necessary.
- Medical devices and diagnostic equipment that require reliable and accurate analog-to-digital conversion.
Q & A
- What is the resolution of the AD679JD ADC?
The AD679JD has a resolution of 14 bits.
- What is the sampling rate of the AD679JD?
The AD679JD has a sampling rate of 128 kSPS.
- What is the full power bandwidth of the AD679JD?
The full power bandwidth of the AD679JD is 1 MHz.
- What is the input impedance of the AD679JD?
The input impedance of the AD679JD is 10 MΩ.
- What are the supply voltages for the AD679JD?
The AD679JD operates from +5 V and ±12 V supplies.
- Is the AD679JD MIL-STD-883 compliant?
- What is the data format of the AD679JD?
The data format is straight binary for unipolar mode and twos complement binary for bipolar mode.
- How can conversions be initiated on the AD679JD?
Conversions can be initiated under microprocessor control or by an external clock asynchronous to the system clock.
- What is the typical power dissipation of the AD679JD?
The typical power dissipation is 560 mW.
- In what package is the AD679JD available?
The AD679JD is available in a 28-Pin Ceramic DIP package.
