ADC121S625_14 Datasheet, PDF (1/31 Pages) Texas Instruments – ADC121S625 12-Bit, 50 ksps to 200 ksps, Differential Input, Micro Power Sampling A/D Converter

ADC121S625
www.ti.com
SNAS294B – MAY 2005 – REVISED MARCH 2013
ADC121S625 12-Bit, 50 ksps to 200 ksps, Differential Input, Micro Power Sampling A/D
Converter
Check for Samples: ADC121S625
FEATURES
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•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
• 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.
Connection Diagram
V_REF
+IN
-IN
GND
1
8
2
7
ADC121S625
3
6
4
5
+V_A
SCLK
D_OUT
CS
Figure 1. 8-Lead VSSOP
See DGK Package
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PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
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