ADC122S101_15 Datasheet, PDF (1/28 Pages) Texas Instruments – 2 Channel, 500 ksps to 1 Msps 12-Bit A/D Converter

ADC122S101
www.ti.com
SNAS286D – MARCH 2005 – REVISED MARCH 2013
ADC122S101 2 Channel, 500 ksps to 1 Msps 12-Bit A/D Converter
Check for Samples: ADC122S101
FEATURES
1
•2 Specified Over a Range of Sample Rates
• Two Input Channels
• Variable Power Management
• Single power supply with 2.7V - 5.25V range
APPLICATIONS
• Portable Systems
• Remote Data Acquisition
• Instrumentation and Control Systems
KEY SPECIFICATIONS
• DNL: +0.9 / −0.6 LSB (typ)
• INL: ±0.64 LSB (typ)
• SNR: 72.4 dB (typ)
• Power Consumption
– 3V Supply: 4.3 mW (typ)
– 5V Supply: 13.1 mW (typ)
DESCRIPTION
The ADC122S101 is a low-power, two-channel
CMOS 12-bit analog-to-digital converter with a high-
speed serial interface. Unlike the conventional
practice of specifying performance at a single sample
rate only, the ADC122S101 is fully specified over a
sample rate range of 500 ksps to 1 Msps. The
converter is based on a successive-approximation
register architecture with an internal track-and-hold
circuit. It can be configured to accept one or two input
signals at inputs IN1 and IN2.
The output serial data is straight binary, and is
compatible with several standards, such as SPI™,
QSPI™, MICROWIRE, and many common DSP
serial interfaces.
The ADC122S101 operates with a single supply that
can range from +2.7V to +5.25V. Normal power
consumption using a +3V or +5V supply is 4.3 mW
and 13.1 mW, respectively. The power-down feature
reduces the power consumption to just 0.14 µW using
a +3V supply, or 0.32 µW using a +5V supply.
The ADC122S101 is available in an 8-lead VSSOP
package. Operation over the industrial temperature
range of −40°C to +85°C is ensured.
These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam
during storage or handling to prevent electrostatic damage to the MOS gates.
Table 1. PIN-COMPATIBLE ALTERNATIVES BY RESOLUTION AND SPEED⁽¹⁾
Resolution
12-bit
10-bit
8-bit
50 to 200 ksps
ADC122S021
ADC102S021
ADC082S021
Specified for Sample Rate Range of:
200 to 500 ksps
ADC122S051
ADC102S051
ADC082S051
500 ksps to 1 Msps
ADC122S101
ADC102S101
ADC082S101
(1) All devices are fully pin and function compatible.
Connection Diagram
CS
V_A
GND
IN2
1
8
2
7
ADC122S101
3
6
4
5
SCLK
DOUT
DIN
IN1
Figure 1. 8-Lead VSSOP
See DGK Package
1
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Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
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2
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.
Copyright © 2005–2013, Texas Instruments Incorporated