AD9251BCPZRL7-20

Series:	--
Packaging:	Tape & Reel (TR)
Part Status:	Active
Number of Bits:	14
Sampling Rate (Per Second):	20M
Number of Inputs:	2
Input Type:	Differential
Data Interface:	Parallel
Configuration:	S/H-ADC
Ratio - S/H:ADC:	1:1
Number of A/D Converters:	2
Architecture:	Pipelined
Reference Type:	External, Internal
Voltage - Supply, Analog:	1.7 V ~ 1.9 V
Voltage - Supply, Digital:	1.7 V ~ 3.6 V
Features:	Simultaneous Sampling
Operating Temperature:	-40°C ~ 85°C
Package / Case:	64-VFQFN Exposed Pad, CSP
Supplier Device Package:	64-LFCSP-VQ (9x9)
Base Part Number:	AD9251

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The AD9251BCPZRL7-20 is a high-speed, low-power, 8-bit successive approximation, low-voltage analog-to-digital converter (ADC). It is designed to extend the dynamic range of low-voltage applications, such as industrial ADC modules, smart meters and battery-operated applications. The AD9251BCPZRL7-20 has an integrated voltage reference and offers excellent performance. Overview The AD9251BCPZRL7-20 is part of the AD9251 series of low-voltage, high-speed ADCs from Analog Devices. It is an 8-bit ADC with a sampling rate of 20 MS/s and an internal voltage reference. It is available in a 0.4mm pitch, small QFN-16 package. This device features a power-down mode and a Shutdown mode for power savings, as well as a programmable reference voltage. In addition, it offers high accuracy and low integral non-linearity (INL). Features The AD9251BCPZRL7-20 offers a wide range of features to meet the performance needs of various applications. It has a two-step undersampling frequency range of 0.38 Hz to 10 MHz and a full power bandwidth (Vdd = AVDD = 3.3V) at 1.0 MHz. Furthermore, it offers a low power mode, low noise of 16 μV, and a low voltage reference in the range of 0.53V to 1.72V. Additionally, it provides a wide power supply range of 1.35V to 3.3V. The AD9251BCPZRL7-20 offers 12-bits of resolution at low sampling rates and an 8-bit resolution at high sampling rates. It also features a wide analog input voltage range of 0V to Vref and a power consumption of only 70 mW at a sampling rate of 15 MS/s and a supply voltage of 3.0V. Applications The AD9251BCPZRL7-20 is well-suited for use in industrial, medical and consumer applications that require a low-voltage, high-speed, low-power ADC. It is suitable for factory automation, data recording and transmission, energy measurement, sensors and instrumentation. Additionally, it can be used to interface with sensors and actuators, as well as in healthcare and wearable devices.Working Principle The AD9251BCPZRL7-20 operates on the successive approximation register (SAR) principle. In this type of ADC, a known reference voltage is compared to the input voltage. The ADC then successively generates a binary code from the comparison, until the input voltage is equal to the reference voltage. This binary code is then converted to the nearest digital representation of the voltage. The AD9251BCPZRL7-20 operates with a three-step conversion process: conversion, tracking and data capture. During conversion, a comparator compares the input voltage with a digital word, otherwise known as the digital-to-analog converter code. If the voltage is above the digital code, the code is incremented by one; otherwise, the code is decremented by one and left unchanged. This process is repeated until the digital code and the voltage signal coincide. In tracking mode, the digital code is tweaked to reduce offset and linearity errors. Finally, the data capture starts the output process. The digital code is clocked out and placed in the output latch, where it can be converted to the corresponding voltage. Conclusion The AD9251BCPZRL7-20 is a high-speed, low-power, 8-bit analog-to-digital converter from Analog Devices. It features a sampling rate of 20 MS/s and an internal voltage reference. The ADC is well-suited for industrial, medical and consumer applications that require a low-voltage, low-power ADC. It is designed to extend the dynamic range of low-voltage applications, such as industrial ADC modules, smart meters and battery-operated applications. The AD9251BCPZRL7-20 operates on the successive approximation register (SAR) principle and offers excellent performance.

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