BurrBrown Products

from Texas Instruments

FEATURES

APPLICATIONS

DESCRIPTION

ADS7887

ADS7888

SLAS468 – JUNE 2005

10-/8-Bit, 1.25-MSPS, MICRO-POWER, MINIATURE

SAR ANALOG-TO-DIGITAL CONVERTERS

•

Base Band Converters in Radio Communi-

•

1.25-MHz Sample Rate Serial Device

cation

•

10-Bit Resolution – ADS7887

•

Motor Current/Bus Voltage Sensors in Digital

•

8-Bit Resolution – ADS7888

Drives

•

Zero Latency

•

Optical Networking (DWDM, MEMS Based

•

25-MHz Serial Interface

Switching)

•

Supply Range: 2.35 V to 5.25 V

•

Optical Sensors

•

Battery Powered Systems

•

Typical Power Dissipation at 1.25 MSPS:

•

Medical Instrumentations

•

High-Speed Data Acquisition Systems

•

High-Speed Closed-Loop Systems

•

±0.35 LSB INL, DNL – ADS7887

•

±0.15 LSB INL, ±0.1 LSB DNL – ADS7888

•

61dB SINAD, -84 dB THD – ADSA7887

•

49.5 dB SINAD, -67.5 dB THD – ADS7888

•

•

Power Down Current: 1 µA

•

Wide Input Bandwidth: 15 MHz at 3 dB

•

6-Pin SOT23 and SC70 Packages

The ADS7887 is a 10-bit, 1.25-MSPS analog-to-digital converter (ADC), and the ADS7888 is a 8-bit, 1.25-MSPS

ADC. The devices include a capacitor based SAR A/D converter with inherent sample and hold. The serial

interface in each device is controlled by the CS and SCLK signals for glueless connections with microprocessors

and DSPs. The input signal is sampled with the falling edge of CS, and SCLK is used for conversion and serial

data output.

The devices operate from a wide supply range from 2.35 V to 5.25 V. The low power consumption of the devices

make them suitable for battery-powered applications. The devices also include a power saving powerdown

feature for when the devices are operated at lower conversion speeds.

high as 5.25 V when device supply is 2.35 V. This feature is useful when digital signals are coming from other

circuit with different supply levels. Also this relaxes restriction on power up sequencing.

The ADS7887 and ADS7888 are available in 6-pin SOT23 and SC70 packages and are specified for operation

from -40°C to 125°C.

Micro-Power Miniature SAR Converter Family

BIT

< 300 KSPS

300 KSPS – 1.25 MSPS

12-Bit

10-Bit

8-Bit

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas

Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

PRODUCTION DATA information is current as of publication date.

Copyright © 2005, Texas Instruments Incorporated

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.