Features • True Simultaneous Sampling Differential Inputs • Guaranteed performance from 200 kSPS to 500 kSPS • External Reference • Wide Input Common-Mode Voltage Range • Single High-Speed Serial Data Output • Operating Temperature Range of −40°C to +105°C • SPI™/QSPI™/MICROWIRE™/DSP compatible Serial Interface Description The ADC122S655 is a dual 12-bit, 200 kSPS to 500 kSPS 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 ADC122S655 features an external reference that can be varied from 1.0V to VA. The ADC122S655's serial data output is binary 2's complement and is compatible with several standards, such as SPI™, QSPI™, MICROWIRE™, and many common DSP serial interfaces. The serial clock (SCLK) and chip select bar ( ^CS) are shared by both channels. Operating from a single 5V analog supply and a reference voltage of 2.5V, the total power consumption while operating at 500 kSPS is typically 11 mW. With the ADC122S655 operating in power-down mode, the power consumption reduces to 3 µW. The differential input, low power consumption, and small size make the ADC122S655 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 6.4 MHz to 16 MHz. The ADC122S655 is available in a 10-lead MSOP package. Key Specification Conversion Rate 200 kSPS to 500 kSPS 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 500 kSPS  Converting, VA = 5V, VREF = 2.5V 11 mW (typ)  Power-Down, VA = 5V, VREF = 2.5V 3 µW (typ) Applications • Motor Control • Power Meters/Monitors • Multi-Axis Positioning Systems • Instrumentation and Control Systems • Data Acquisition Systems • Medical Instruments • Direct Sensor Interface

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Typical Application click for larger image current transducer application	Block Diagram click for larger image
Typical Performance click for larger image typical DNL plot

Datasheet

Title		Size	Date	Other Language
	ADC122S655 Dual 12-Bit, 200 kSPS to 500 kSPS, Simultaneous Sampling A/D Converter	501 Kbytes	25-Feb-08

Featured Application Notes

Title		Size	Date	Other Language
	AN-1261: Application Note 1261 Power Supply Effects on Noise Performance	78 Kbytes	16-Mar-07	中文

More Application Notes

Title		Size	Date	Other Language
	AN-1261: Application Note 1261 Power Supply Effects on Noise Performance	78 Kbytes	16-Mar-07	中文

Reliability Metrics

Part Number	Process	EFR Reject	EFR Sample Size	PPM	LTA Rejects	LTA Device Hours	FITS	MTTF (Hours)
ADC122S655CIMM	CMOS7	0	18406	0	0	1089000	4	309006723
ADC122S655CIMMX	CMOS7	0	18406	0	0	1089000	4	309006723

Note: The Early Failure Rates (EFR) were calculated as point estimate PPM based on rejects and sample size for EFR. The Long Term Failure Rates were calculated at 60% confidence using the Arrhenius equation at 0.7eV activation energy and derating the assumed stress temperature of 150°C to an application temperature of 55°C.

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