Overview
The AD678JN 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 on a single chip. It is designed for high-speed and high-accuracy applications, making it suitable for both signal processing and measurement tasks. The AD678JN operates from +5 V and ±12 V supplies and is available in a 28-lead plastic DIP package.
Key Specifications
| Parameter | Value |
|---|---|
| Number of Bits | 12 |
| Sampling Rate | 200 kSPS |
| Input Type | Single Ended |
| Input Range | 10 V (full-scale) |
| 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 | 0°C to +70°C |
| Package Type | 28-Lead Plastic DIP |
| Reference Type | Internal |
| Data Interface | Parallel (16-bit or 8-bit bus) |
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.
- High Accuracy and Speed: Utilizes a recursive subranging algorithm with error correction and flash converter circuitry to achieve high speed and resolution.
- Ease of Use: Designed for easy board layout with a choice of single or two read cycle output, compatible with 16-bit or 8-bit buses.
- Reliability: Fabricated on Analog Devices’ BiMOS process, ensuring long-term reliability compared to multichip and hybrid designs.
- Upgrade Path: Provides the same pinout as the 14-bit, 128 kSPS AD679 ADC, facilitating upgrades.
Applications
- Signal Processing: Suitable for applications requiring high S/N+D ratio, THD, and IMD, such as audio processing, medical devices, and industrial control systems.
- Measurement Applications: Ideal for control and measurement tasks due to its fully specified dc parameters like INL, gain, and offset.
- Military and Aerospace: Available in versions that comply with MIL-STD-883C Class B, making it suitable for military and aerospace applications.
- Industrial and Instrumentation: Used in various industrial and instrumentation applications requiring high accuracy and reliability.
Q & A
- What is the resolution of the AD678JN ADC?
The AD678JN is a 12-bit analog-to-digital converter.
- What is the sampling rate of the AD678JN?
The AD678JN has a sampling rate of 200 kSPS.
- What are the supply voltages for the AD678JN?
The AD678JN operates from +5 V and ±12 V supplies.
- What is the input impedance of the AD678JN?
The input impedance is 10 MΩ, allowing direct connection to unbuffered sources without signal degradation.
- What are the available package types for the AD678JN?
The AD678JN is available in 28-lead plastic DIP, ceramic DIP, and 44-lead J-leaded ceramic surface mount packages.
- Is the AD678JN RoHS compliant?
No, the AD678JN contains lead and is RoHS non-compliant.
- What is the operating temperature range for the AD678JN?
The operating temperature range is 0°C to +70°C.
- Does the AD678JN have an internal reference?
Yes, the AD678JN has an internal voltage reference.
- What data interface does the AD678JN support?
The AD678JN supports a parallel data interface compatible with 16-bit or 8-bit buses.
- Is the AD678JN suitable for military applications?
Yes, the AD678JN is available in versions that comply with MIL-STD-883C Class B, making it suitable for military applications).
