Overview
The AD679SD is a 14-bit monolithic analog-to-digital converter (ADC) produced by Analog Devices Inc. This component is part of the AD679 family and is known for its complete integration, minimizing the need for external components. It combines a high-speed sample-and-hold amplifier (SHA), an ADC, a 5V reference, a clock, and a digital interface on a single chip. This integration provides a fully specified sampling A/D function that is not achievable with discrete designs. The AD679SD is fabricated using Analog Devices’ BiMOS process, which combines low power CMOS logic with high precision, low noise bipolar circuits, and laser-trimmed thin-film resistors for high accuracy.
Key Specifications
| Parameter | Value |
|---|---|
| Resolution | 14 bits |
| Conversion Rate | 128 kSPS |
| Full Power Bandwidth | 1 MHz |
| Full Linear Bandwidth | 500 kHz |
| S/N+D Ratio | 78 dB (K, B, T Grades) |
| Data Format | Straight Binary (Unipolar), Twos Complement Binary (Bipolar) |
| Input Range | 10 V Unipolar or Bipolar |
| Input Impedance | 10 MΩ |
| Supply Voltage | +5 V and ±12 V |
| Power Dissipation | 560 mW (typ) |
| Package Options | 28-lead plastic DIP, ceramic DIP, 44 J-leaded ceramic surface-mount |
| Operating Temperature Range | -55°C to +125°C (AD679SD) |
Key Features
- Complete integration of SHA, ADC, reference, clock, and digital interface on a single chip.
- High-speed conversion rate of 128 kSPS.
- Full power bandwidth of 1 MHz and full linear bandwidth of 500 kHz.
- High S/N+D ratio of 78 dB (K, B, T Grades).
- Supports both unipolar and bipolar input modes with straight binary and twos complement data formats, respectively.
- High input impedance of 10 MΩ, allowing direct connection to unbuffered sources without signal degradation.
- Microprocessor-compatible bus interface with 8-bit bus.
- MIL-STD-883 compliant versions available.
Applications
- Signal processing applications due to its specified ac parameters such as S/N+D ratio, THD, and IMD.
- Measurement applications due to its specified dc parameters.
- Data acquisition systems requiring high accuracy and speed.
- Military and industrial applications where the component’s robust operating temperature range and MIL-STD-883 compliance are beneficial.
Q & A
- What is the resolution of the AD679SD ADC?
The AD679SD has a resolution of 14 bits.
- What is the conversion rate of the AD679SD?
The AD679SD has a conversion rate of 128 kSPS.
- What is the full power bandwidth of the AD679SD?
The full power bandwidth of the AD679SD is 1 MHz.
- What are the supported data formats for the AD679SD?
The AD679SD supports straight binary for unipolar mode and twos complement binary for bipolar mode.
- What is the input impedance of the AD679SD?
The input impedance of the AD679SD is 10 MΩ.
- What are the supply voltage requirements for the AD679SD?
The AD679SD operates from +5 V and ±12 V supplies.
- What are the package options available for the AD679SD?
The AD679SD is available in 28-lead plastic DIP, ceramic DIP, and 44 J-leaded ceramic surface-mount packages.
- Is the AD679SD MIL-STD-883 compliant?
Yes, the AD679SD has MIL-STD-883 compliant versions available.
- What is the operating temperature range of the AD679SD?
The operating temperature range of the AD679SD is -55°C to +125°C.
- How does the AD679SD achieve high speed and resolution?
The AD679SD utilizes a recursive subranging algorithm that includes error correction and flash converter circuitry to achieve high speed and resolution.
