Overview
The AD7675AST is a 16-bit, 100 kSPS (kilosamples per second), fully differential analog-to-digital converter (ADC) produced by Analog Devices Inc. This device operates from a single 5 V power supply and is designed for high-performance applications. It features a charge redistribution successive approximation register (SAR) architecture and includes an internal conversion clock, error correction circuits, and both serial and parallel system interface ports. The AD7675AST is fabricated using Analog Devices’ high-performance 0.6 micron CMOS process and is available in a 48-lead LQFP (Low Profile Quad Flat Package) or a 48-lead LFCSP (Lead Frame Chip Scale Package) with an operating temperature range of –40°C to +85°C.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Resolution | 16 | - | - | Bits |
| Sampling Rate | 100 | - | - | kSPS |
| Analog Input Voltage Range | - | - | - | V (dependent on configuration) |
| Integral Nonlinearity (INL) | - | - | 1.5 | LSB |
| Signal-to-Noise Ratio (SNR) | 92 | 94 | - | dB |
| Total Harmonic Distortion (THD) | - | - | - | dB |
| Power Supply Voltage | - | 5 | - | V |
| Power Dissipation (typical) | - | 17 | - | mW |
| Power-Down Current | - | - | 7 | µW |
| Operating Temperature Range | -40 | - | 85 | °C |
| Package Type | - | - | - | 48-lead LQFP or LFCSP |
Key Features
- Excellent Linearity: The AD7675AST has a maximum integral nonlinearity of 1.5 LSB with no missing 16-bit codes.
- Superior AC Performance: It offers a minimum dynamic range of 92 dB, with a typical value of 94 dB.
- Fast Throughput: This ADC operates at a sampling rate of 100 kSPS and features internal error correction circuitry.
- Single-Supply Operation: The device operates from a single 5 V supply, dissipating only 17 mW typically, and as low as 15 µW at a 100 SPS throughput.
- Versatile Interface: It supports both serial and parallel interfaces, compatible with either 3 V or 5 V logic.
Applications
- CT Scanners: High-resolution imaging requires precise ADCs like the AD7675AST.
- Data Acquisition Instrumentation: Suitable for various data acquisition systems due to its high accuracy and speed.
- Spectrum Analysis: Used in spectrum analyzers for precise signal measurement.
- Medical Instruments: Applied in medical devices requiring high precision and reliability.
- Battery-Powered Systems: Low power consumption makes it ideal for battery-powered applications.
- Process Control: Used in industrial process control systems for accurate and reliable data conversion.
Q & A
- What is the resolution of the AD7675AST?
The AD7675AST has a resolution of 16 bits. - What is the sampling rate of the AD7675AST?
The sampling rate is 100 kSPS. - What is the power supply voltage for the AD7675AST?
The device operates from a single 5 V power supply. - What are the typical power dissipation and power-down current of the AD7675AST?
The typical power dissipation is 17 mW, and the power-down current is 7 µW. - What are the operating temperature ranges for the AD7675AST?
The operating temperature range is from –40°C to +85°C. - What types of packages are available for the AD7675AST?
The device is available in 48-lead LQFP and LFCSP packages. - What are the key features of the AD7675AST’s interface?
The device supports both serial and parallel interfaces, compatible with either 3 V or 5 V logic. - What are some common applications of the AD7675AST?
Common applications include CT scanners, data acquisition instrumentation, spectrum analysis, medical instruments, battery-powered systems, and process control. - How does the AD7675AST ensure high accuracy?
The device is hardware factory calibrated and comprehensively tested for both AC and DC parameters such as SNR, THD, gain, offset, and linearity. - What is the significance of the AD7675AST’s low power consumption?
The low power consumption makes it suitable for battery-powered applications and reduces overall system power requirements.
