ADS8588S Datasheet, PDF (26/63 Pages) Texas Instruments – 16-Bit, 200-kSPS, 8-, 6- and 4-Channel, Simultaneous-Sampling ADCs with Bipolar Inputs on a Single Supply

ADS8588S, ADS8586S, ADS8584S
SBAS642 – DECEMBER 2016
8 Detailed Description
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8.1 Overview
The ADS8588S, ADS8586S, and ADS8584S are 16-bit data acquisition (DAQ) systems with 8-, 6- and 4-channel
analog inputs, respectively. On all these devices, each analog input channel consists of an input clamp protection
circuit, a programmable gain amplifier (PGA), a second-order, low-pass filter, and a track-and-hold circuit that
facilitates simultaneous sampling of the signals on all input channels. The sampled signal is digitized using a 16-
bit analog-to-digital converter (ADC), based on the successive approximation register (SAR) architecture. This
overall system can achieve a maximum throughput of 200 kSPS for all channels. The devices feature a 2.5-V
internal reference with a fast-settling buffer, a programmable digital averaging filter to improve noise
performance, and high speed serial and parallel interfaces for communication with a wide variety of digital hosts.
The devices operate from a single 5-V analog supply and can accommodate true bipolar input signals of ±10 V
and ±5 V. The input clamp protection circuitry can tolerate voltages up to ±15 V. The devices offer a constant
1-MΩ resistive input impedance irrespective of the sampling frequency or the selected input range. The
integration of multiple, simultaneously sampling precision ADC inputs and analog front-end circuits with high
input impedance operating from a single 5-V supply offers a simplified end solution without requiring external
high-voltage bipolar supplies and complicated driver circuits.
8.2 Functional Block Diagram
AVDD
AIN_1P
AIN_1GND
1M
Clamp
Clamp
1M
PGA
2^nd -Order
LPF
ADC
Driver
AIN_2P
AIN_2GND
1M
Clamp
Clamp
1M
PGA
2^nd -Order
LPF
ADC
Driver
AIN_3P
AIN_3GND
1M
Clamp
Clamp
1M
PGA
2^nd -Order
LPF
ADC
Driver
16-bit
SAR
ADC
16-bit
SAR
ADC
16-bit
SAR
ADC
DVDD
SAR
Logic and
Digital Control
SER / PAR
Interface
BUSY
FRSTDATA
STBY
CONVSTA/B
RESET
RANGE/SDI
CS
RD/SCLK
PAR/ SER
DB[15:0]
DOUTA
DOUTB
AIN_4P
AIN_4GND
1M
Clamp
Clamp
1M
PGA
2^nd -Order
LPF
ADC
Driver
AIN_5P
AIN_5GND
1M
Clamp
Clamp
1M
PGA
2^nd -Order
LPF
ADC
Driver
AIN_6P
AIN_6GND
1M
Clamp
Clamp
1M
PGA
2^nd -Order
LPF
ADC
Driver
AIN_7P
AIN_7GND
1M
Clamp
Clamp
1M
PGA
2^nd -Order
LPF
ADC
Driver
16-bit
SAR
ADC
16-bit
SAR
ADC
16-bit
SAR
ADC
16-bit
SAR
ADC
Digital Filter
2.5 V V_REF
OS0
OS1
OS2
REFCAPA
REFCAPB
REFIN / REFOUT
REFSEL
AIN_8P
AIN_8GND
1M
Clamp
Clamp
1M
PGA
2^nd -Order
LPF
ADC
Driver
AGND
16-bit
SAR
ADC
ADS8588S
REFGND
DGND
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Product Folder Links: ADS8588S ADS8586S ADS8584S