Overview
The AD7878KN is a high-performance, 12-bit analog-to-digital converter (ADC) produced by Analog Devices Inc. This component is designed to provide a complete A/D function with a versatile DSP interface, making it suitable for various applications requiring high-speed and accurate analog-to-digital conversion. The AD7878KN 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 significantly reduces the software overhead associated with servicing interrupts in DSP processors.
Key Specifications
| Parameter | Value | Units | Test Conditions/Comments |
|---|---|---|---|
| Number of Bits | 12 | ||
| Sampling Rate | 100 kHz | ||
| Number of Inputs | 1 | Single Ended | |
| Data Interface | Parallel, DSP | ||
| Configuration | S/H-ADC | 1:1 S/H:ADC Ratio | |
| Architecture | SAR | ||
| Reference Type | Internal | ||
| Voltage - Supply, Analog | ±5 V | VDD = +5 V ± 5%, VSS = –5 V ± 5% | |
| Voltage - Supply, Digital | +5 V | VCC = +5 V ± 5% | |
| Operating Temperature Range | -55 °C to 125 °C | ||
| Power Consumption | 60 mW (typ) | ||
| Data Access Time | 41 ns (max) | ||
| Signal-to-Noise Ratio (SNR) | 70 dB (min) @ 25°C | VIN = 10 kHz Sine Wave, fSAMPLE = 100 kHz |
Key Features
- Complete A/D Function with DSP Interface: The AD7878KN includes an on-chip track/hold, on-chip reference, and a 12-bit SAR ADC, along with an 8-word FIFO memory to reduce software overhead.
- Dynamic Specifications for DSP Users: Fully specified and tested for ac parameters such as signal-to-noise ratio, harmonic distortion, and intermodulation distortion.
- Fast Microprocessor Interface: Data access time of 41 ns, compatible with modern 16-bit microprocessors and digital signal processors.
- Low Power Consumption: Typical power consumption of 60 mW.
- Versatile Packaging: Available in 28-pin plastic and hermetic dual-in-line package (DIP), leadless ceramic chip carrier (LCCC), or plastic leaded chip carrier (PLCC).
Applications
- Digital Signal Processing: Suitable for applications involving digital signal processing, such as speech recognition and synthesis.
- Spectrum Analysis: Used in spectrum analysis due to its high accuracy and dynamic specifications.
- High Speed Modems: Compatible with high-speed modem applications requiring fast and accurate A/D conversion.
- DSP Servo Control: Used in servo control systems that require precise and rapid analog-to-digital conversion.
Q & A
- What is the resolution of the AD7878KN ADC?
The AD7878KN has a resolution of 12 bits. - What is the sampling rate of the AD7878KN?
The sampling rate is 100 kHz. - What type of data interface does the AD7878KN use?
The AD7878KN uses a parallel and DSP interface. - What is the power consumption of the AD7878KN?
The typical power consumption is 60 mW. - What is the operating temperature range of the AD7878KN?
The operating temperature range is -55 °C to 125 °C. - What is the signal-to-noise ratio (SNR) of the AD7878KN?
The SNR is 70 dB (min) at 25°C with a 10 kHz sine wave input and a sampling frequency of 100 kHz. - What type of architecture does the AD7878KN use?
The AD7878KN uses a successive approximation register (SAR) architecture. - Does the AD7878KN have an internal reference?
Yes, the AD7878KN has an internal reference. - What is the data access time of the AD7878KN?
The data access time is 41 ns (max). - In what package types is the AD7878KN available?
The AD7878KN is available in 28-pin plastic and hermetic dual-in-line package (DIP), leadless ceramic chip carrier (LCCC), or plastic leaded chip carrier (PLCC).
