3 V to 5 V Single Supply, 200 kSPS, 12-Bit, Serial Sampling ADC

The AD7853 / AD7853L are high speed, low power, 12-bit ADCs that operate from a single 3 V or 5 V power supply, the AD7853 being optimized for speed and the AD7853L for low power. The ADC powers up with a set of default conditions at which time it can be operated as a read-only ADC. The ADC contains self-calibration and system-calibration options to ensure accurate operation over time and temperature and have a number of power-down options for low power applications. The part powers up with a set of default conditions and can operate as a read only ADC.

The AD7853 is capable of 200 kHz throughput rate while the AD7853L is capable of 100 kHz throughput rate. The input track-and-hold acquires a signal in 500 ns and features a pseudo-differential sampling scheme. The AD7853 / AD7853L voltage range is 0 to VREF with both straight binary and 2s complement output coding. Input signal range is to the supply, and the part is capable of converting full power signals to 100 kHz.

CMOS construction ensures low power dissipation of typically 4.5 mW for normal operation and 1.15 mW in power-down mode, with a throughput rate of 10 kSPS (VDD = 3 V). The part is available in 24-lead, 0.3 inch wide dual-in-line package (DIP), 24-lead small outline (SOIC) and 24-lead small shrink outline (SSOP) packages.

PRODUCT HIGHLIGHTS

* Specified for 3 V and 5 V supplies.

* Automatic calibration on power-up.

* Flexible power management options including automatic

power-down after conversion.

* Operates with reference voltages from 1.2 V to VDD.

* Analog input ranges from 0 V to VDD.

* Self- and system calibration.

* Versatile serial I/O port (SPI/QSPI/8051/µP).

* Lower power version AD7853L.

APPLICATIONS

* Battery-Powered Systems (Personal Digital Assistants,

Medical Instruments, Mobile Communications)

* Pen Computers

* Instrumentation and Control Systems

* High Speed Modems

* Specified for VDD of 3 V to 5.5 V

* Read-Only Operation

* AD7853–200 kSPS; AD7853L–100 kSPS

* System and Self-Calibration with Autocalibration on Power-Up

* Automatic Power Down After Conversion (25 mW)