Overview
The AD7878BQ is a high-performance, 12-bit analog-to-digital converter (ADC) produced by Analog Devices Inc. This component is designed to provide a complete ADC function with a versatile DSP interface, making it suitable for a wide range of applications that require high-speed and accurate signal conversion. The AD7878BQ features an on-chip track/hold, on-chip reference, and a 12-bit successive approximation register (SAR) ADC. It also includes 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
| Specification | Value |
|---|---|
| Resolution | 12 bits |
| Sampling Rate | Up to 100 kHz |
| Analog Input Range | ±3 V bipolar |
| Signal-to-Noise Ratio (SNR) | 72 dB |
| Harmonic Distortion | Fully specified for dynamic parameters |
| Data Access Time | 41 ns max |
| Power Consumption | 60 mW typical |
| Operating Temperature | –25°C to +85°C (AD7878BQ) |
| Package Types | 28-pin plastic and hermetic dual-in-line package (DIP), leadless ceramic chip carrier (LCCC), plastic leaded chip carrier (PLCC) |
Key Features
- Complete ADC function with on-chip track/hold, on-chip reference, and 12-bit SAR ADC.
- 8-word FIFO memory and associated control logic to reduce software overhead in DSP applications.
- Fast data access time of 41 ns, enabling direct interfacing to DSP processors and high-speed 16-bit microprocessors.
- On-chip status/control register for programming the effective length of the FIFO and monitoring FIFO status.
- Fabricated in Linear Compatible CMOS (LC2MOS) technology, combining precision bipolar circuits with low-power CMOS logic.
Applications
- Digital Signal Processing (DSP)
- Speech Recognition and Synthesis
- Spectrum Analysis
- High-Speed Modems
- DSP Servo Control
- Various industrial, medical, communications, and entertainment applications.
Q & A
- What is the resolution of the AD7878BQ ADC?
The AD7878BQ has a resolution of 12 bits.
- What is the maximum sampling rate of the AD7878BQ?
The maximum sampling rate is up to 100 kHz.
- What is the analog input range of the AD7878BQ?
The analog input range is ±3 V bipolar.
- What is the signal-to-noise ratio (SNR) of the AD7878BQ?
The SNR is 72 dB.
- What is the data access time of the AD7878BQ?
The data access time is 41 ns maximum.
- What are the package options available for the AD7878BQ?
The package options include 28-pin plastic and hermetic dual-in-line package (DIP), leadless ceramic chip carrier (LCCC), and plastic leaded chip carrier (PLCC).
- What is the operating temperature range of the AD7878BQ?
The operating temperature range is –25°C to +85°C.
- What technology is used in the fabrication of the AD7878BQ?
The AD7878BQ is fabricated in Linear Compatible CMOS (LC2MOS) technology.
- What is the purpose of the FIFO memory in the AD7878BQ?
The FIFO memory reduces software overhead by allowing up to eight samples to be digitized before the microprocessor needs to service the ADC.
- In which applications is the AD7878BQ commonly used?
The AD7878BQ is commonly used in digital signal processing, speech recognition and synthesis, spectrum analysis, high-speed modems, and DSP servo control.
