Overview
The AD7878SQ, produced by Analog Devices Inc., is a complete 12-bit analog-to-digital converter (ADC) with a versatile digital signal processing (DSP) interface. This component is fabricated using Linear Compatible CMOS (LC2MOS) technology, which combines precision bipolar circuits with low power CMOS logic. The AD7878SQ features an on-chip track/hold, on-chip reference, and a 12-bit ADC, making it suitable for digitizing AC signals with high accuracy. It also includes an 8-word first-in, first-out (FIFO) memory and associated control logic, reducing software overheads in DSP applications.
Key Specifications
| Parameter | Units | Test Conditions/Comments |
|---|---|---|
| Resolution | 12 bits | |
| Sampling Rate | 100 kHz | |
| Signal-to-Noise Ratio (SNR) | 70 dB min (at 25°C) | VIN = 10 kHz Sine Wave, fSAMPLE = 100 kHz |
| Harmonic Distortion | Typically 71.5 dB for 0 < VIN < 50 kHz | |
| Data Access Time | 41 ns max | |
| Operating Temperature Range | -55°C to +125°C | For AD7878SQ version |
| Power Consumption | 60 mW typ | VDD = +5 V ± 5%, VCC = +5 V ± 5%, VSS = -5 V ± 5% |
| Package Styles | 28-pin plastic and hermetic dual-in-line package (DIP), leadless ceramic chip carrier (LCCC), plastic leaded chip carrier (PLCC) |
Key Features
- Complete A/D function with on-chip track/hold, on-chip reference, and 12-bit ADC.
- 8-word FIFO memory and associated control logic to reduce software overheads in DSP applications.
- Fast microprocessor interface with a data access time of 41 ns, compatible with modern 16-bit microprocessors and DSP processors.
- Dynamic specifications fully tested for AC parameters such as signal-to-noise ratio, harmonic distortion, and intermodulation distortion.
- Low power consumption of 60 mW typical.
- Operating temperature range of -55°C to +125°C for the AD7878SQ version.
Applications
- Digital Signal Processing (DSP)
- Speech Recognition and Synthesis
- Spectrum Analysis
- High Speed Modems
- DSP Servo Control
Q & A
- What is the resolution of the AD7878SQ ADC?
The AD7878SQ has a resolution of 12 bits. - What is the sampling rate of the AD7878SQ?
The sampling rate is 100 kHz. - What is the signal-to-noise ratio (SNR) of the AD7878SQ?
The SNR is 70 dB minimum at 25°C with VIN = 10 kHz Sine Wave and fSAMPLE = 100 kHz. - What is the data access time of the AD7878SQ?
The data access time is 41 ns maximum. - What are the operating temperature ranges for the AD7878SQ?
The operating temperature range is -55°C to +125°C for the AD7878SQ version. - What types of packages are available for the AD7878SQ?
The part is available in 28-pin plastic and hermetic dual-in-line package (DIP), leadless ceramic chip carrier (LCCC), and plastic leaded chip carrier (PLCC). - What is the power consumption of the AD7878SQ?
The power consumption is typically 60 mW. - What are some common applications of the AD7878SQ?
Common applications include Digital Signal Processing (DSP), Speech Recognition and Synthesis, Spectrum Analysis, High Speed Modems, and DSP Servo Control. - Does the AD7878SQ have any on-chip memory?
Yes, it features an 8-word FIFO memory and associated control logic. - Is the AD7878SQ compatible with modern microprocessors and DSP processors?
Yes, it is compatible with modern 16-bit microprocessors and DSP processors due to its fast data access time.
