Overview
The AD7878KP, produced by Analog Devices Inc., is a fast and complete 12-bit analog-to-digital converter (ADC) designed with a versatile digital signal processing (DSP) interface. This component integrates an 8-word first-in, first-out (FIFO) memory and associated control logic, allowing for efficient data handling and reduced software overhead in DSP applications. The AD7878KP features an on-chip track/hold circuit, an internal reference, and a 12-bit successive approximation register (SAR) ADC. It is fabricated using Linear Compatible CMOS (LC2MOS) technology, combining precision bipolar circuits with low-power CMOS logic.
Key Specifications
| Parameter | Value | Units | Test Conditions/Comments |
|---|---|---|---|
| Number of Bits | 12 | ||
| Sampling Rate | 100 kHz | ||
| Number of Inputs | 1 | Single Ended | |
| Input Type | Single Ended | ||
| Data Interface | DSP | ||
| Configuration | S/H-ADC | 1:1 S/H:ADC Ratio | |
| Architecture | SAR | ||
| Reference Type | Internal | ||
| Voltage - Supply, Analog | ±5 V | ||
| Voltage - Supply, Digital | 5 V | ||
| Operating Temperature | 0°C to +70°C | ||
| Package / Case | 28-CDIP (0.600", 15.24mm) | ||
| Signal-to-Noise Ratio (SNR) | 72 dB min | dB | VIN = 10 kHz Sine Wave, fSAMPLE = 100 kHz |
| Data Access Time | 41 ns max | ns | |
| Power Consumption | 60 mW typ | mW |
Key Features
- Complete A/D Function with DSP Interface: The AD7878KP includes an on-chip track/hold circuit, an internal reference, and a 12-bit SAR ADC, providing a complete function for digitizing AC signals.
- 8-Word FIFO Memory: Reduces software overhead by allowing up to eight samples to be digitized before the microprocessor needs to service the A/D converter.
- Fast Microprocessor Interface: With a data access time of 41 ns, it is compatible with modern 16-bit microprocessors and DSP processors.
- Dynamic Specifications: Fully specified and tested for AC parameters such as signal-to-noise ratio, harmonic distortion, and intermodulation distortion.
- Low Power Consumption: Operates at a typical power consumption of 60 mW.
- Advanced Fabrication Technology: Fabricated using Linear Compatible CMOS (LC2MOS) technology, combining precision bipolar circuits with low-power CMOS logic.
Applications
- Digital Signal Processing: Ideal for various DSP applications due to its fast data access time and FIFO memory.
- Speech Recognition and Synthesis: Suitable for speech processing applications requiring high-speed and accurate analog-to-digital conversion.
- Spectrum Analysis: Used in spectrum analysis applications where dynamic specifications such as SNR and harmonic distortion are critical.
- High-Speed Modems: Applicable in high-speed modem designs requiring fast and accurate data conversion.
- DSP Servo Control: Can be used in servo control systems that require precise and fast analog-to-digital conversion.
Q & A
- What is the resolution of the AD7878KP ADC?
The AD7878KP has a resolution of 12 bits.
- What is the sampling rate of the AD7878KP?
The sampling rate of the AD7878KP is 100 kHz.
- What type of input does the AD7878KP support?
The AD7878KP supports single-ended inputs.
- What is the data interface type of the AD7878KP?
The AD7878KP has a DSP (Digital Signal Processing) interface.
- What is the operating temperature range of the AD7878KP?
The operating temperature range of the AD7878KP is 0°C to +70°C.
- What is the power consumption of the AD7878KP?
The typical power consumption of the AD7878KP is 60 mW.
- What is the signal-to-noise ratio (SNR) of the AD7878KP?
The SNR of the AD7878KP is 72 dB minimum.
- What is the data access time of the AD7878KP?
The data access time of the AD7878KP is 41 ns maximum.
- What type of memory does the AD7878KP have?
The AD7878KP has an 8-word FIFO (First-In, First-Out) memory.
- What are some common applications of the AD7878KP?
The AD7878KP is commonly used in digital signal processing, speech recognition and synthesis, spectrum analysis, high-speed modems, and DSP servo control.
