Overview
The AD678SD, produced by Analog Devices Inc., is a 12-bit monolithic analog-to-digital converter (ADC) designed for a wide range of applications requiring high precision and speed. This component integrates a sample-hold amplifier (SHA), a microprocessor-compatible bus interface, a voltage reference, and clock generation circuitry on a single chip. The AD678SD is part of the AD678 family, which is known for its complete integration and minimal external component requirements, making it a robust solution for signal processing and measurement applications.
Key Specifications
| Parameter | Specification |
|---|---|
| Resolution | 12 bits |
| Conversion Rate | 200 kSPS |
| Full Power Bandwidth | 1 MHz |
| Full Linear Bandwidth | 500 kHz |
| Input Range | 10 V (unipolar or bipolar) |
| Input Impedance | 10 MΩ |
| Supply Voltages | +5 V, ±12 V |
| Power Dissipation | 560 mW (typ) |
| Package Options | 28-pin plastic DIP, ceramic DIP, 44-lead J-leaded ceramic surface mount |
| Temperature Range | -55°C to +125°C (for AD678SD/883B) |
| MIL-STD Compliance | MIL-STD-883C Class B |
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.
- High speed conversion rate of 200 kSPS.
- High input impedance of 10 MΩ, allowing direct connection to unbuffered sources.
- Choice of digital interface formats: 16-bit bus in a single read operation or 8-bit bus in two read operations (8+4) with right or left justification.
- Data format is straight binary for unipolar mode and twos complement binary for bipolar mode.
- Fabricated on Analog Devices' BiMOS process, combining low power CMOS logic with high precision, low noise bipolar circuits.
- Laser-trimmed thin-film resistors for high accuracy.
- Recursive subranging algorithm with error correction and flash converter circuitry for high speed and resolution.
Applications
- Signal processing applications requiring high dynamic performance (S/N+D ratio, THD, IMD).
- Measurement applications needing high accuracy and stability (dc parameters specified for K, B, and T grades).
- Industrial and commercial data acquisition systems.
- Military applications due to MIL-STD-883C Class B compliance.
- Any system requiring a high-speed, high-precision ADC with minimal external component requirements.
Q & A
- What is the resolution of the AD678SD ADC?
The AD678SD has a resolution of 12 bits.
- What is the conversion rate of the AD678SD?
The AD678SD can perform 200,000 conversions per second (200 kSPS).
- What are the supply voltages for the AD678SD?
The AD678SD operates from +5 V and ±12 V supplies.
- What is the input range of the AD678SD?
The input range is 10 V, which can be either unipolar or bipolar.
- What is the input impedance of the AD678SD?
The input impedance is 10 MΩ, allowing direct connection to unbuffered sources without signal degradation.
- What are the package options for the AD678SD?
The AD678SD is available in 28-pin plastic DIP, ceramic DIP, and 44-lead J-leaded ceramic surface mount packages.
- Is the AD678SD compliant with any military standards?
Yes, the AD678SD is compliant with MIL-STD-883C Class B.
- What is the temperature range for the AD678SD/883B?
The temperature range for the AD678SD/883B is -55°C to +125°C.
- How does the AD678SD handle data formatting?
The data format is straight binary for unipolar mode and twos complement binary for bipolar mode.
- What is the power dissipation of the AD678SD?
The power dissipation is typically 560 mW.
