ADC122S706_15 Datasheet, PDF (1/31 Pages) Texas Instruments – Dual 12-Bit, 500 kSPS to 1 MSPS, Simultaneous Sampling A/D Converter

ADC122S706
www.ti.com
SNAS408A – NOVEMBER 2007 – REVISED MARCH 2013
ADC122S706 Dual 12-Bit, 500 kSPS to 1 MSPS, Simultaneous Sampling A/D Converter
Check for Samples: ADC122S706
FEATURES
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•2 True Simultaneous Sampling Differential
Inputs
• Guaranteed Performance from 500 kSPS to 1
MSPS
• External Reference
• Wide Input Common-Mode Voltage Range
• Single or Dual High-Speed Serial Data Outputs
• Operating Temperature Range of −40°C to
+105°C
• SPI™/QSPI™/MICROWIRE/DSP Compatible
Serial Interface
APPLICATIONS
• Motor Control
• Power Meters/Monitors
• Multi-Axis Positioning Systems
• Instrumentation and Control Systems
• Data Acquisition Systems
• Medical Instruments
• Direct Sensor Interface
KEY SPECIFICATIONS
• Conversion Rate: 500 kSPS to 1 MSPS
• INL: ±1 LSB (Max)
• DNL: ±0.95 LSB (Max)
• SNR: 71 dBc (Min)
• THD: -72 dBc (Min)
• ENOB: 11.25 Bits (Min)
• Power Consumption at 1 MSPS
– Converting, V_A = 5V, V_D = 3V: 20 mW (Typ)
– Converting, V_A = 5V, V_D = 5V: 25 mW (Typ)
– Power-Down: 3 µW (Typ)
DESCRIPTION
The ADC122S706 is a dual 12-bit, 500 kSPS to 1
MSPS simultaneous sampling Analog-to-Digital (A/D)
converter. The analog inputs on both channels are
sampled simultaneously to preserve their relative
phase information to each other. The converter is
based on a successive-approximation register
architecture where the differential nature of the
analog inputs is maintained from the internal track-
and-hold circuits throughout the A/D converter to
provide excellent common-mode signal rejection. The
ADC122S706 features an external reference that can
be varied from 1.0V to V_A.
The ADC122S706 offers dual high-speed serial data
outputs that are binary 2's complement and are
compatible with several standards, such as SPI™,
QSPI™, MICROWIRE, and many common DSP
serial interfaces. Channel A's conversion result is
outputted on D_OUTA while Channel B's conversion
result is outputted on D_OUTB. This feature makes the
ADC122S706 an excellent replacement for systems
using two distinct ADCs in a simultaneous sampling
application. The serial clock (SCLK) and chip select
bar (CS) are shared by both channels. For lower
power consumption, a single serial data output mode
is externally selectable.
The ADC122S706 may be operated with independent
analog (V_A) and digital (V_D) supplies. V_A can range
from 4.5V to 5.5V and V_D can range from 2.7V to V_A.
With the ADC122S706 operating with a V_A of 5V and
a V_D of 3V, the power consumption at 1 MSPS is
typically 25 mW. Operating in power-down mode, the
power consumption of the ADC122S706 decreases to
3 µW. The differential input, low power consumption,
and small size make the ADC122S706 ideal for direct
connection to sensors in motor control applications.
Operation is guaranteed over the industrial
temperature range of −40°C to +105°C and clock
rates of 8 MHz to 16 MHz. The ADC122S706 is
available in a 14-lead TSSOP package.
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.
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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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