1FEATURES
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, VA = 5V, VD = 3V: 20 mW (Typ)
– Converting, V A = 5V, VD = 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 VA.
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 DOUTA while Channel B's conversion
result is outputted on DOUTB. 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 (VA) and digital (VD) supplies. VA can range
from 4.5V to 5.5V and VD can range from 2.7V to VA.
With the ADC122S706 operating with a VA of 5V and
a VD 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.