ADS7861E/2K5

Number of A/D Converters:	2
Base Part Number:	ADS7861
Supplier Device Package:	24-SSOP/QSOP
Package / Case:	24-SSOP (0.154", 3.90mm Width)
Operating Temperature:	-40°C ~ 125°C
Features:	Selectable Address, Simultaneous Sampling
Voltage - Supply, Digital:	5V
Voltage - Supply, Analog:	5V
Reference Type:	External, Internal
Architecture:	SAR
Series:	--
Ratio - S/H:ADC:	1:1
Configuration:	MUX-S/H-ADC
Data Interface:	SPI
Input Type:	Differential
Number of Inputs:	4
Sampling Rate (Per Second):	500k
Number of Bits:	12
Part Status:	Active
Packaging:	Tape & Reel (TR)

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Data Acquisition - Analog to Digital Converters (ADC)Analog to Digital Converters (ADC) are devices that are used to transform analog data, such as sound and electrical signals, into digital data. The ADS7861E/2K5 is a 12-bit single-ended analog-to-digital converter (ADC) which uses a 2k5 delta-sigma architecture. It is capable of converting signals up to 50 kilosamples per second with a noise-free aperture time of 284.3 nanoseconds.Application FieldThe ADS7861E/2K5 is a high-performance signal capture device, offering excellent linearity, low noise and low power for signal conditioning applications. It is mainly used in digital audio, broadcast audio and video interfaces, electrical motor control, measurement and testing equipment and industrial control and automation systems.Working PrincipleThe working principle behind the ADS7861E/2K5 ADC is based on a delta-sigma architecture. It consists of a first-order Delta-Sigma modulator which is followed by a digital filter. The Delta-Sigma modulator takes an analog input signal and performs conversion by sampling it at discrete points at regular intervals. The output is then filtered and the filtered signal is used as the output of the converter.The Delta-Sigma modulator works by first sampling the input signal at a desired rate and then encoding it into a stream of pulse density modulated (PDM) bits. These bits are then passed through a digital low-pass filter to obtain the filtered representation of the digital data. The filtering process amplifies or attenuates certain frequencies and thus ensures good signal-to-noise ratio.The filtered digital signal is then assembled and converted into a digital code using pulse width modulation techniques. The ADS7861E/2K5 has an integrated 12-bit ADC which is capable of handling up to 50 kilosamples per second with a noise-free aperture time of 284.3 nanoseconds.ConclusionThe ADS7861E/2K5 is a 12-bit single-ended analog-to-digital converter (ADC). It is used in digital audio, broadcast audio and video interfaces, electrical motor control, measurement and testing equipment and industrial control and automation systems. It employs a delta-sigma architecture which consists of a first-order Delta-Sigma modulator which is followed by a digital filter. The filtered digital signal is then assembled and converted into a digital code using pulse width modulation techniques. The integrated 12-bit ADC is capable of handling up to 50 kilosamples per second with a noise-free aperture time of 284.3 nanoseconds.

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