Overview
The AD678BD is a 12-bit monolithic analog-to-digital converter (ADC) produced by Analog Devices Inc. This component is part of the AD678 series, which is designed to be a complete, multipurpose ADC. It includes a sample-hold amplifier (SHA), a microprocessor-compatible bus interface, a voltage reference, and clock generation circuitry. The AD678BD is fabricated using Analog Devices’ BiMOS process, combining low power CMOS logic with high precision, low noise bipolar circuits. This integration minimizes external component requirements, providing a fully specified sampling A/D function that is unattainable with discrete designs.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Resolution | 12-bit | |
| Conversion Rate | 200 kSPS | |
| Full Power Bandwidth | 1 MHz | |
| Full Linear Bandwidth | 500 kHz | |
| Signal-to-Noise Ratio (S/N+D) | 72 dB | |
| Input Range | 10 V (unipolar or bipolar) | |
| Input Impedance | 10 MΩ | |
| Supply Voltage | +5 V, ±12 V | |
| Power Dissipation | 560 mW (typ) | |
| Package Type | 28-lead ceramic DIP | |
| Operating Temperature Range | -40°C to +85°C |
Key Features
- Complete integration of sample-hold amplifier, ADC, voltage reference, and clock generation on a single chip.
- AC and DC characterized and specified for K, B, and T grades.
- Supports both unipolar and bipolar input modes with straight binary and twos complement data formats, respectively.
- Microprocessor-compatible bus interface with 8-bit or 16-bit bus options.
- High input impedance allows direct connection to unbuffered sources without signal degradation.
- Laser-trimmed thin-film resistors for high accuracy.
- MIL-STD-883 compliant versions available.
Applications
The AD678BD is suitable for a variety of signal processing and measurement applications. Its high speed and resolution make it ideal for use in data acquisition systems, medical devices, industrial control systems, and other applications requiring precise analog-to-digital conversion. The component's ability to operate in both unipolar and bipolar modes and its compatibility with microprocessor interfaces further expand its applicability in diverse electronic systems.
Q & A
- What is the resolution of the AD678BD?
The AD678BD has a resolution of 12 bits.
- What is the conversion rate of the AD678BD?
The AD678BD has a conversion rate of 200 kSPS.
- What is the full power bandwidth of the AD678BD?
The full power bandwidth of the AD678BD is 1 MHz.
- What are the input range options for the AD678BD?
The AD678BD supports both unipolar and bipolar input modes with a full-scale range of 10 V.
- What is the input impedance of the AD678BD?
The input impedance of the AD678BD is 10 MΩ).
- What are the supply voltage requirements for the AD678BD?
The AD678BD operates from +5 V and ±12 V supplies).
- What is the typical power dissipation of the AD678BD?
The typical power dissipation of the AD678BD is 560 mW).
- In what package types is the AD678BD available?
The AD678BD is available in a 28-lead ceramic DIP package).
- What is the operating temperature range of the AD678BD?
The operating temperature range of the AD678BD is -40°C to +85°C).
- Is the AD678BD compliant with any military standards?
Yes, the AD678BD has versions that are compliant with MIL-STD-883).
