1FEATURES

23• True Differential Inputs

• Specified Performance from 200 kSPS to 500

kSPS

• External Reference

• Wide Input Common-Mode Voltage Range

• SPI™/ QSPI™/MICROWIRE/DSP Compatible

Serial Interface

APPLICATIONS

• Automotive Navigation

• Portable Systems

• Medical Instruments

• Instrumentation and Control Systems

• Motor Control

• Direct Sensor Interface

KEY SPECIFICATIONS

• Conversion Rate: 200 kSPS to 500 kSPS

• INL: ± 0.95 LSB (max)

• DNL: ± 0.85 LSB (max)

• Offset Error: ± 3.0 LSB (max)

• Gain Error: ± 5.5 LSB (max)

• SINAD: 70 dB (min)

• Power Consumption at VA = 5 V

– Active, 500 kSPS: 9 mW (typ)

– Active, 200 kSPS: 7 mW (typ)

– Power-Down: 1.5 μW (typ)

DESCRIPTION

The ADC121S655 is a 12-bit, 200 kSPS to 500 kSPS

sampling Analog-to-Digital (A/D) converter that

features a fully differential, high impedance analog

input and an external reference. The reference

voltage can be varied from 1.0V to VA, with a

corresponding resolution between 244μV and VA

divided by 4096.

The output serial data is binary 2's complement and

is compatible with several standards, such as SPI,

QSPI, MICROWIRE, and many common DSP serial

interfaces. The differential input, low power

consumption, and small size make the ADC121S655

ideal for direct connection to transducers in battery

operated systems or remote data acquisition

applications.

Operating from a single 5V supply, the supply current when operating at 500 kSPS is typically 1.8 mA. The

supply current drops down to 0.3 μA typically when

the ADC121S655 enters power-down mode. The

ADC121S655 is available in the VSSOP-8 package.

Operation is specified over the industrial temperature

range of −40°C to +105°C and clock rates of 3.2 MHz

to 8 MHz.