ADS8556 Datasheet, PDF (1/47 Pages) Texas Instruments – 16-14-12-Bit Six-Channel Simultaneous Sampling ANALOG-TO-DIGITAL CONVERTERS

Product
Folder
Sample &
Buy
Technical
Documents
Tools &
Software
Support &
Community
ADS8556, ADS8557, ADS8558
SBAS404D – OCTOBER 2006 – REVISED FEBRUARY 2016
ADS855x
16-, 14-, 12-Bit, Six-Channel, Simultaneous Sampling Analog-to-Digital Converters
1 Features
•1 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: 630 kSPS (PAR) or 450 kSPS (SER)
ADS8557: 670 kSPS (PAR) or 470 kSPS (SER)
ADS8558: 730 kSPS (PAR) or 500 kSPS (SER)
• Maximum Data Rate with External Conversion
Clock and Reference:
800 kSPS (PAR) or 530 kSPS (SER)
• Pin-Selectable or Programmable Input Voltage
Ranges: Up to ±12 V
• Excellent Signal-to-Noise Performance:
ADS8556: 91.5 dB, ADS8667: 85 dB,
ADS8668: 73.9 dB
• Programmable and Buffered Internal Reference:
0.5 V to 2.5 V and 0.5 V to 3.0 V
• 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
Block Diagram
HVDD HVSS AVDD
BVDD
CH_A0
AGND
CONVST_A
REFC_A
CH_A1
AGND
CH_B0
AGND
CONVST_B
REFC_B
CH_B1
AGND
CH_C0
AGND
CONVST_C
REFC_C
CH_C1
AGND
Clock
Generator
SAR ADC
SAR ADC
SAR ADC
SAR ADC
SAR ADC
SAR ADC
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
2 Applications
• Power Quality Measurement
• Protection Relays
• Multi-Axis Motor Control
• Programmable Logic Controllers
• Industrial Data Acquisition
3 Description
The ADS855x contains 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 ADS855x supports data rates of up to 730 kSPS
in parallel interface mode or up to 500 kSPS 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 ADS855x is specified over the full industrial
temperature range of –40°C to 125°C and is available
in an LQFP-64 package.
Device Information⁽¹⁾
PART NUMBER
PACKAGE
BODY SIZE (NOM)
ADS8556
ADS8557
LQFP (64)
10.00 mm × 10.00 mm
ADS8558
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
SNR vs Temperature
94
92
90
88
86
84
82
80
78
76
74
72
70
-40 -25 -10
ADS8557
ADS8556
ADS8558
5 20 35 50 65 80 95 110 125
Temperature (°C)
REF_IO
String
DAC
2.5V/3V
REF
AGND
1
BGND
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCTION DATA.