FEATURES

· Single 1.2-V to 3.6-V Supply Operation

· High Throughput

– 200/240/280KSPS for 12/10/8-Bit VDD ³ 1.6 V

– 100/120/140KSPS for 12/10/8-Bit V DD ³ 1.2 V

· ±1.5LSB INL, 12-Bit NMC (ADS7866)

· 71 dB SNR, –83 dB THD at fIN = 30 kHz

(ADS7866)

· Synchronized Conversion with SCLK

· SPI Compatible Serial Interface

· No Pipeline Delays

· Low Power

– 1.39 mW Typ at 200 KSPS, VDD = 3.6 V

– 0.39 mW Typ at 200 KSPS, V DD = 1.6 V

– 0.22 mW Typ at 100 KSPS, VDD = 1.2 V

· Auto Power-Down: 8 nA Typ, 300 nA Max

· 0 V to V DD Unipolar Input Range

· 6-Pin SOT-23 Package

APPLICATIONS

· Battery Powered Systems

· Isolated Data Acquisition

· Medical Instruments

· Portable Communication

· Portable Data Acquisition Systems

· Automatic Test Equipment

DESCRIPTION

The ADS7866/67/68 are low power, miniature,

12/10/8-bit A/D converters each with a unipolar,

single-ended input. These devices can operate from a

single 1.6 V to 3.6 V supply with a 200-KSPS

throughput for ADS7866. In addition, these devices

can maintain at least a 100-KSPS throughput with a

supply as low as 1.2 V.

The sampling, conversion, and activation of digital

output SDO are initiated on the falling edge of CS.

The serial clock SCLK is used for controlling the

conversion rate and shifting data out of the converter.

Furthermore, SCLK provides a mechanism to allow

digital host processors to synchronize with the con-

verter. These converters interface with

micro-processors or DSPs through a high-speed SPI

compatible serial interface. There are no pipeline

delays associated with the device.

The minimum conversion time is determined by the

frequency of the serial clock input, SCLK, while the

maximum frequency of SCLK is determined by the

minimum sampling time required to charge the input

capacitance to 12/10/8-bit accuracy for the

ADS7866/67/68, respectively. The maximum

throughput is determined by how often a conversion

is initiated when the minimum sampling time is met

and the maximum SCLK frequency is used. Each

device automatically powers down after each conver·

sion, which allows each device to save power when

the throughput is reduced while using the maximum

SCLK frequency.

The converter reference is taken internally from the

supply. Hence, the analog input range for these

devices is 0 V to VDD.

These devices are available in a 6-pin SOT-23

package and are characterized over the industrial

–40°C to 85°C temperature range.