Overview
The AD678TD is a 12-bit monolithic analog-to-digital converter (ADC) produced by Analog Devices Inc. This component is part of the AD678 family, which is known for its complete integration of a high-speed sample-hold amplifier (SHA), ADC, voltage reference, clock, and digital interface on a single chip. This integration minimizes the need for external components, providing a fully specified sampling A/D function that is not easily achievable with discrete designs. The AD678TD is particularly suited for applications requiring high-speed and high-precision analog-to-digital conversion, including signal processing and measurement applications.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Resolution | 12 bits | |
| Conversion Rate | 200 kSPS | |
| Full Power Bandwidth | 1 MHz | |
| Full Linear Bandwidth | 500 kHz | |
| Signal-to-Noise Ratio (S/N+D) | 72 dB | |
| Input Impedance | 10 MΩ | |
| Input Range | 10 V (unipolar or bipolar) | |
| Supply Voltage | +5 V, ±12 V | |
| Power Dissipation | 560 mW (typ) | |
| Operating Temperature Range | -55°C to +125°C | |
| Package Type | 28-lead ceramic DIP |
Key Features
- Complete integration of sample-hold amplifier, ADC, voltage reference, clock, and digital interface on a single chip.
- High-speed conversion rate of 200 kSPS and full power bandwidth of 1 MHz.
- High input impedance of 10 MΩ, allowing direct connection to unbuffered sources without signal degradation.
- Support for both unipolar and bipolar input ranges with straight binary and twos complement data formats, respectively.
- Microprocessor-compatible bus interface with 8-bit or 16-bit bus options.
- Low power CMOS logic combined with high precision, low noise bipolar circuits using Analog Devices’ BiMOS process.
- Laser-trimmed thin-film resistors for high accuracy.
- MIL-STD-883 compliant versions available.
Applications
- Signal processing applications requiring high-speed and high-precision analog-to-digital conversion.
- Measurement applications where both AC and DC parameters are critical.
- Data acquisition systems that need integrated sample-hold amplifiers and ADCs.
- Military and industrial applications due to its wide operating temperature range and MIL-STD-883 compliance.
Q & A
- What is the resolution of the AD678TD? The AD678TD has a resolution of 12 bits.
- What is the conversion rate of the AD678TD? The conversion rate is 200 kSPS.
- What is the full power bandwidth of the AD678TD? The full power bandwidth is 1 MHz.
- What is the input impedance of the AD678TD? The input impedance is 10 MΩ.
- What are the supply voltage requirements for the AD678TD? The AD678TD operates from +5 V and ±12 V supplies.
- What is the typical power dissipation of the AD678TD? The typical power dissipation is 560 mW.
- What are the operating temperature ranges for the AD678TD? The operating temperature range is -55°C to +125°C.
- Is the AD678TD available in MIL-STD-883 compliant versions? Yes, MIL-STD-883 compliant versions are available.
- What types of data formats does the AD678TD support? The AD678TD supports straight binary for unipolar mode and twos complement binary for bipolar mode.
- Can the AD678TD be interfaced with both 8-bit and 16-bit buses? Yes, the AD678TD can be interfaced with both 8-bit and 16-bit buses).
