Overview
The AD7878LP, produced by Analog Devices Inc., is a complete 12-bit analog-to-digital converter (ADC) with a versatile digital signal processing (DSP) interface. This device is designed to provide high-speed and accurate conversion of analog signals to digital data. It features an on-chip track/hold circuit, an internal reference, and a 12-bit successive approximation register (SAR) ADC. The AD7878LP 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 |
|---|---|---|---|
| Number of Bits | 12 | ||
| Sampling Rate | 100 kHz | ||
| Number of Inputs | 1 | ||
| Input Type | Single Ended | ||
| Data Interface | DSP | ||
| Configuration | S/H-ADC | ||
| Ratio - S/H:ADC | 1:1 | ||
| 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 | 0°C to +70°C | ||
| Package / Case | 28-pin plastic and hermetic dual-in-line package (DIP), leadless ceramic chip carrier (LCCC), or plastic leaded chip carrier (PLCC) | ||
| Signal-to-Noise Ratio (SNR) | 70 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 AD7878LP provides a complete function for digitizing AC signals to 12-bit accuracy, including an on-chip track/hold circuit, internal reference, and 12-bit 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.
- Versatile Packaging: Available in 28-pin plastic and hermetic DIP, LCCC, or PLCC packages.
Applications
- Digital Signal Processing: Ideal for applications requiring high-speed and accurate signal processing.
- Speech Recognition and Synthesis: Suitable for speech processing applications due to its high SNR and dynamic range.
- Spectrum Analysis: Used in spectrum analysis applications where precise and fast conversion of analog signals is necessary.
- High Speed Modems: Applicable in high-speed modem designs requiring fast and accurate analog-to-digital conversion.
- DSP Servo Control: Can be used in servo control systems that require precise and rapid signal processing.
Q & A
- What is the resolution of the AD7878LP ADC?
The AD7878LP has a resolution of 12 bits. - What is the sampling rate of the AD7878LP?
The sampling rate of the AD7878LP is 100 kHz. - What type of input does the AD7878LP support?
The AD7878LP supports single-ended inputs. - What is the data interface type of the AD7878LP?
The data interface of the AD7878LP is designed for DSP applications. - What is the architecture of the AD7878LP ADC?
The AD7878LP uses a successive approximation register (SAR) architecture. - What is the typical power consumption of the AD7878LP?
The typical power consumption of the AD7878LP is 60 mW. - What are the operating temperature ranges for the AD7878LP?
The operating temperature range for the AD7878LP is 0°C to +70°C. - What types of packages are available for the AD7878LP?
The AD7878LP is available in 28-pin plastic and hermetic DIP, LCCC, or PLCC packages. - What is the signal-to-noise ratio (SNR) of the AD7878LP?
The SNR of the AD7878LP is 70 dB min. - What is the data access time of the AD7878LP?
The data access time of the AD7878LP is 41 ns max.
