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1FEATURES

2? True Differential Inputs

? Ensured Performance from 50ksps to 200ksps

? External Reference

? High AC Common-Mode Rejection

? SPI?/QSPI?/MICROWIRE/DSP Compatible

Serial Interface

APPLICATIONS

? Automotive Navigation

? Portable Systems

? Medical Instruments

? Instrumentation and Control Systems

? Motor Control

? Direct Sensor Interface

KEY SPECIFICATIONS pin?

Conversion Rate 50 to 200 ksps

? Offset Error 0.4 LSB (typ)

? Gain Error 0.05 LSB (typ)

? INL ± 1 LSB (max)

? DNL ± 0.75 LSB (max)

? CMRR 82 dB (typ)

? Power Consumption

– Active, 200 ksps 2.25 mW (typ)

– Active, 50 ksps 1.33 mW (typ)

– Power Down 60 nW (typ)

DESCRIPTION

The ADC121S625 is a 12-bit, 50 ksps to 200 ksps

sampling Analog-to-Digital (A/D) converter that

features a fully differential, high impedance analog

input and an external reference. While best

performance is achieved with reference voltage

between 500mV and 2.5V, the reference voltage can be varied from 100mV to 2.5V, with a corresponding

resolution between 49μV and 1.22mV.

The output serial data is binary 2's complement, and

is compatible with several standards, such as SPI?,

QSPI?, MICROWIRE, and with many common DSP

serial interfaces. The differential input, low power,

automatic power down, and small size make the

ADC121S625 ideal for direct connection to

transducers in battery operated systems or remote

data acquisition applications.

Operating from a single +5V supply, the normal

power consumption is reduced to a few nanowatts in

the power-down mode. The ADC121S625 is a pin?

compatible superior replacement for the ADS7817

and is available in the VSSOP-8 package. Operation

is ensured over the industrial temperature range of

?40°C to +85°C and clock rates of 800 kHz to 3.2

MHz.