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FEATURES

· 250-kHz Sampling Rate

· 4-V, 5-V, 10-V, ±3.33-V, ±5-V, and ±10-V Input

Ranges

· 73-dB SINAD With 45-kHz Input

· ±0.45 LSB Max INL

· ±0.45 LSB Max DNL, 12-Bits No Missing

Codes

· ±1 LSB Bipolar Zero Errors

· ±0.4 PPM/°C Bipolar Zero Error Drift

· Six Specified Input Ranges

· SPI Compatible Serial Output with referDaisy-

Chain (TAG) Feature

· 5-V Supply

· Pin-Compatible With ADS7808 (Low Speed)

and 16-Bit ADS8509/7809

· Uses Internal or External Reference

· 70-mW Typ Power Dissipation at 250 KSPS

· 20-Pin SO Package

· Simple DSP Interface

APPLICATIONS

· Industrial Process Control

· Data Acquisition Systems

· Digital Signal Processing

· Medical Equipment

· Instrumentation

DESCRIPTION

The ADS8508 is a complete 12-bit sampling

analog-to-digital (A/D) converter using state-of-the-art CMOS structures. It contains a complete 12-bit,

capacitor-based, successive approximation register

(SAR) A/D converter with sample-and-hold, referDaisy-

ence, clock, and a serial data interface. Data can be

output using the internal clock or can be

synchronized to an external data clock. The ADS8508

also provides an output synchronization pulse for

ease of use with standard DSP processors.

The ADS8508 is specified at a 250-kHz sampling rate

over the full temperature range. Precision resistors

provide various input ranges including ±10 V and 0 V

to 5 V, while the innovative design allows operation

from a single +5-V supply with power dissipation

under 100 mW.

The ADS8508 is available in a 20-pin SO package,

fully specified for operation over the industrial -40°C

to 85°C temperature range.