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.