Overview
The AD7878JP, produced by Analog Devices Inc., is a complete 12-bit analog-to-digital converter (ADC) designed for high-speed applications. It features a versatile digital signal processing (DSP) interface, making it suitable for a wide range of digital signal processing tasks. The AD7878JP includes an on-chip track/hold circuit, an internal reference, and a 12-bit successive approximation register (SAR) ADC. Additionally, it incorporates an 8-word first-in, first-out (FIFO) memory and associated control logic, which reduces the software overhead associated with servicing interrupts in DSP processors.
Key Specifications
| Parameter | Value | Units | Comments |
|---|---|---|---|
| Number of Bits | 12 | ||
| Sampling Rate | 100 kHz | ||
| Number of Inputs | 1 | Single-ended input | |
| Input Type | Single-ended | ||
| Data Interface | DSP | ||
| Architecture | SAR (Successive Approximation Register) | ||
| Reference Type | Internal | ||
| Voltage - Supply, Analog | ±5 V | ||
| Voltage - Supply, Digital | 5 V | ||
| Operating Temperature | 0°C to +70°C (commercial), -55°C to +125°C (military) | ||
| Package / Case | 28-CDIP (0.600", 15.24mm) | ||
| Signal-to-Noise Ratio (SNR) | 70 dB to 72 dB | dB | At 25°C, VIN = 10 kHz sine wave, fSAMPLE = 100 kHz |
| Data Access Time | 41 ns | ns | |
| Power Consumption | 60 mW (typical) | mW |
Key Features
- Complete A/D Function with DSP Interface: The AD7878JP provides a complete function for digitizing AC signals to 12-bit accuracy, including an on-chip track/hold circuit, internal reference, and 12-bit SAR ADC.
- 8-Word FIFO Memory: Reduces software overhead associated with servicing interrupts in DSP processors by allowing up to eight samples to be digitized before the microprocessor needs to service the A/D converter.
- Fast Microprocessor Interface: Data access time of 41 ns, making it compatible with modern 16-bit microprocessors and digital signal processors.
- Dynamic Specifications: Fully specified and tested for AC parameters such as signal-to-noise ratio, harmonic distortion, and intermodulation distortion.
- Low Power Consumption: Typical power consumption of 60 mW.
Applications
- Digital Signal Processing: Suitable for various DSP applications due to its fast data access time and compatibility with DSP processors.
- Speech Recognition and Synthesis: Used in speech processing systems due to its high-speed and accurate conversion capabilities.
- Spectrum Analysis: Ideal for spectrum analysis tasks requiring high-speed and precise data conversion).
- High-Speed Modems: Used in high-speed modem applications where fast and accurate data conversion is crucial).
- DSP Servo Control: Suitable for servo control systems that require precise and high-speed data conversion).
Q & A
- What is the resolution of the AD7878JP?
The AD7878JP has a resolution of 12 bits.
- What is the sampling rate of the AD7878JP?
The sampling rate of the AD7878JP is up to 100 kHz.
- What type of input does the AD7878JP support?
The AD7878JP supports single-ended analog inputs.
- What is the data interface type of the AD7878JP?
The AD7878JP features a DSP (Digital Signal Processing) interface.
- What is the power consumption of the AD7878JP?
The typical power consumption of the AD7878JP is 60 mW.
- What is the operating temperature range of the AD7878JP?
The operating temperature range of the AD7878JP is 0°C to +70°C for commercial versions and -55°C to +125°C for military versions.
- What type of package is the AD7878JP available in?
The AD7878JP is available in a 28-CDIP (0.600", 15.24mm) package.
- What is the signal-to-noise ratio (SNR) of the AD7878JP?
The signal-to-noise ratio (SNR) of the AD7878JP is between 70 dB to 72 dB at 25°C, with VIN = 10 kHz sine wave and fSAMPLE = 100 kHz.
- What is the data access time of the AD7878JP?
The data access time of the AD7878JP is 41 ns.
- What are some common applications of the AD7878JP?
The AD7878JP is commonly used in digital signal processing, speech recognition and synthesis, spectrum analysis, high-speed modems, and DSP servo control.
