Overview
The AD678AJ is a 12-bit, 200 kSPS complete sampling analog-to-digital converter (ADC) produced by Analog Devices Inc. This monolithic ADC integrates a sample-hold amplifier (SHA), a microprocessor-compatible bus interface, a voltage reference, and clock generation circuitry. It is designed for both signal processing and measurement applications, offering fully specified AC and DC parameters. The AD678AJ operates on +5 V and ±12 V supplies, dissipating 560 mW typically, and is available in a 44-lead J-leaded ceramic surface mount package (JLCC).
Key Specifications
| Parameter | Value |
|---|---|
| Number of Bits | 12 |
| Sampling Rate | 200 kSPS |
| Input Type | Single Ended |
| Full-Scale Input Range | 10 V |
| Full Power Bandwidth | 1 MHz |
| Full Linear Bandwidth | 500 kHz |
| Input Impedance | 10 MΩ |
| Supply Voltages | +5 V, ±12 V |
| Power Dissipation | 560 mW (typ) |
| Operating Temperature Range | -40°C to +85°C |
| Package Type | 44-Lead J-Leaded Ceramic Surface Mount (JLCC) |
Key Features
- Complete Integration: Combines a high-speed sample-hold amplifier, ADC, 5 V reference, clock, and digital interface on a single chip, minimizing external component requirements.
- Flexible Digital Interface: Supports both 16-bit and 8-bit bus interfaces with right or left justification, and data formats include straight binary for unipolar mode and two's complement binary for bipolar mode.
- High Accuracy and Speed: Utilizes a recursive subranging algorithm with error correction and flash converter circuitry to achieve high speed and resolution.
- Reliability: Fabricated on Analog Devices’ BiMOS process, combining low power CMOS logic with high precision, low noise bipolar circuits, ensuring long-term reliability.
- Upgrade Path: Provides the same pinout as the 14-bit, 128 kSPS AD679 ADC, making it a versatile choice for various applications.
Applications
- Signal Processing: Suitable for applications requiring dynamic parameters such as S/N+D ratio, THD, and IMD.
- Measurement Applications: Fully specified for DC parameters, making it ideal for control and measurement applications.
- Military and Industrial Environments: Available in versions compliant with MIL-STD-883C Class B, suitable for demanding environments.
Q & A
- What is the resolution of the AD678AJ ADC?
The AD678AJ is a 12-bit analog-to-digital converter.
- What is the sampling rate of the AD678AJ?
The sampling rate of the AD678AJ is 200 kSPS.
- What are the supply voltages for the AD678AJ?
The AD678AJ operates on +5 V and ±12 V supplies.
- What is the input impedance of the AD678AJ?
The input impedance of the AD678AJ is 10 MΩ.
- What are the operating temperature ranges for the AD678AJ?
The operating temperature range for the AD678AJ is -40°C to +85°C.
- What package types are available for the AD678AJ?
The AD678AJ is available in a 44-lead J-leaded ceramic surface mount package (JLCC).
- Does the AD678AJ support both unipolar and bipolar modes?
Yes, the AD678AJ supports both unipolar and bipolar modes with straight binary and two's complement binary data formats respectively.
- Is the AD678AJ compliant with any military standards?
Yes, the AD678AJ is available in versions compliant with MIL-STD-883C Class B.
- What is the power dissipation of the AD678AJ?
The AD678AJ dissipates 560 mW typically.
- Can the AD678AJ be directly connected to unbuffered sources?
Yes, the high input impedance of 10 MΩ allows direct connection to unbuffered sources without signal degradation.
