ADS8556 Datasheet, PDF (1/40 Pages) Texas Instruments – 16-14-12-Bit Six-Channel Simultaneous Sampling ANALOG-TO-DIGITAL CONVERTERS

ADS8556
ADS8557
ADS8558
www.ti.com ............................................................................................................................................... SBAS404A – OCTOBER 2006 – REVISED AUGUST 2009
16-, 14-, 12-Bit, Six-Channel, Simultaneous Sampling
ANALOG-TO-DIGITAL CONVERTERS
FEATURES
1
•2 Family of 16-, 14-, 12-Bit, Pin- and
Software-Compatible ADCs
• Six SAR ADCs Grouped in Three Pairs
• Maximum Data Rate Per Channel with Internal
Conversion Clock and Reference:
ADS8556: 630kSPS (PAR) or 450kSPS (SER)
ADS8557: 670kSPS (PAR) or 470kSPS (SER)
ADS8558: 730kSPS (PAR) or 500kSPS (SER)
• Maximum Data Rate with External Conversion
Clock and Reference:
800kSPS (PAR) or 530kSPS (SER)
• Pin-Selectable or Programmable Input Voltage
Ranges: Up to ±12V
• Excellent Signal-to-Noise Performance:
91.5dB (ADS8556)
85dB (ADS8557)
73.9dB (ADS8558)
• Programmable and Buffered Internal
Reference: 0.5V to 2.5V and 0.5V to 3.0V
• Comprehensive Power-Down Modes:
Deep Power-Down (Standby Mode)
Partial Power-Down
Auto-Nap Power-Down
• Selectable Parallel or Serial Interface
• Operating Temperature Range:
–40°C to +125°C
• LQFP-64 Package
APPLICATIONS
• Power Quality Measurement
• Protection Relays
• Multi-Axis Motor Control
• Programmable Logic Controllers
• Industrial Data Acquisition
DESCRIPTION
The ADS8556/7/8 contain six low-power, 16-, 14-, or
12-bit, successive approximation register (SAR)
based analog-to-digital converters (ADCs) with true
bipolar inputs. Each channel contains a
sample-and-hold circuit that allows simultaneous
high-speed multi-channel signal acquisition.
The ADS8556/7/8 support data rates of up to
730kSPS in parallel interface mode or up to 500kSPS
if the serial interface is used. The bus width of the
parallel interface can be set to eight or 16 bits. In
serial mode, up to three output channels can be
activated.
The ADS8556/7/8 is specified over the full industrial
temperature range of –40°C to +125°C and is
available in an LQFP-64 package.
ADS8556
ADS8557
ADS8558
CONVST_A
CH_A0
AGND
S/H
Buffer
REFC_A
CH_A1
AGND
CONVST_B
CH_B0
AGND
S/H
S/H
Buffer
REFC_B
CH_B1
AGND
CONVST_C
CH_C0
AGND
S/H
S/H
Buffer
REFC_C
CH_C1
S/H
AGND
REF_IO
HVDD
HVSS
Buffer
Clock
Generator
Comparator
CDAC 1
SAR Register 1/2
CDAC 2
Comparator
Comparator
CDAC 3
SAR Register 3/4
CDAC 4
Comparator
Comparator
CDAC 5
SAR Register 5/6
CDAC 6
Comparator
String DAC
Internal 2.5V
Reference
Control
Logic
Config
Register
I/O
BUSY/INT
RANGE/XCLK
HW/SW
REF_EN/WR
STBY
RESET
CS/FS
RD
DB[15:0]
WORD/BYTE
PAR/SER
BVDD
BGND
AVDD
AGND
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Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
All trademarks are the property of their respective owners.
2
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 © 2006–2009, Texas Instruments Incorporated