ADS8512_14 Datasheet, PDF (1/34 Pages) Texas Instruments – 12-Bit, 40-kSPS, Low Power Sampling ANALOG-TO-DIGITAL CONVERTER with Internal Reference and Serial Interface

ADS8512
www.ti.com ...................................................................................................................................................................................................... SLAS485 – JUNE 2008
12-Bit, 40-kSPS, Low Power Sampling ANALOG-TO-DIGITAL CONVERTER
with Internal Reference and Serial Interface
FEATURES
1
•234 40-kHz Minimum Sampling Rate
• Very Low Power: 25 mW
• ±3.33-V, ±5-V, ±10-V, 4-V, and 10-V Input
Ranges
• 73.9-dB SINAD with 10-kHz Input
• ±0.5 LSB Max INL
• ±0.5 LSB Max DNL, 12-Bit NMC
• ±5-mV BPZ, ±2 ppm/°C BPZ Drift
• 72-dB Min SINAD, 80-dB Min SFDR
• Uses Internal or External 2.5-V Reference
• No External Calibration Resistors Required
• Single 5-V Analog Supply:
– 32.5-mW Max Power Dissipation
– 50-µW Max Power-Down Mode
• SPI™-Compatible Serial Port up to 20MHz,
with Master/Slave Feature
• Global CONV and 3-Stated Bus for Multi-Chip
Simultaneous S/H Operation
• Pin-Compatible with ADS7812 and 16-Bit
ADS7813/8513
• SO-16 Package
APPLICATIONS
• Industrial Process Control
• Test Equipment
• Robotics
• DSP Servo Control
• Medical Instrumentation
• Portable Data Acquisition Systems
DESCRIPTION
The ADS8512 is a complete low-power, single 5-V
supply, 12-bit sampling analog-to-digital (A/D)
converter. It contains a complete 12-bit
capacitor-based, successive approximation register
(SAR) A/D converter with sample-and-hold (S/H),
clock, reference, and serial data interface. The
converter can be configured for a variety of input
ranges including ±10 V, ±5 V, 0 V to 10 V, and 0.5 V
to 4.5 V. A high-impedance, 0.3-V to 2.8-V input is
also available with input impedance greater than 10
MΩ. For most input ranges, the input voltage can
swing to 25 V or –25 V without damage to the
converter.
An SPI-compatible serial interface allows data to be
synchronized to an internal or external clock. The
ADS8512 is specified at 40-kHz sampling rate over
the –40°C to +85°C industrial temperature range.
Successive Approximation Register
Clock EXT/INT
R1_IN
R2_IN
R3_IN
BUF
CAP
REF
40 kW
8 kW
20 kW
CDAC
Comparator
Serial
Data
Out
and
Control
Buffer
4 kW
Internal
+2.5 V Ref
PWRD
BUSY
CS
CONV
SDATA
DATACLK
1
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.
TMS320 is a trademark of Texas Instruments.
2
SPI is a trademark of Motorola, Inc.
3
All other trademarks are the property of their respective owners.
4
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2008, Texas Instruments Incorporated