ADS8578S Datasheet, PDF (1/58 Pages) Texas Instruments – 14-Bit, High-Speed, 8-Channel, Simultaneous-Sampling ADC with Bipolar Inputs on a Single Supply

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ADS8578S
SBAS825 – APRIL 2017
ADS8578S 14-Bit, High-Speed, 8-Channel, Simultaneous-Sampling ADC with
Bipolar Inputs on a Single Supply
1 Features
•1 14-Bit ADC With Integrated Analog Front-End
• Simultaneous Sampling: 8 Channels
• Pin-Programmable Bipolar Inputs: ±10 V and ±5 V
• High Input Impedance: 1 MΩ
• 5-V Analog Supply: 2.3-V to 5-V Digital Supply
• Overvoltage Input Clamp With 7-kV ESD
• Low-Drift, On-Chip Reference (2.5 V) and Buffer
• Excellent Performance:
– 200-kSPS Max Throughput per Channels
– DNL: ±0.2 LSB; INL: ±0.2 LSB
– SNR: 85.8 dB; THD: −109 dB
• Overtemperature Performance:
– Max Offset Drift: 3 ppm/°C
– Gain Drift: 6 ppm/°C
• On-Chip Digital Filter for Oversampling
• Flexible Parallel, Byte, and Serial Interface
• Temperature Range: –40°C to +125°C
• Package: 64-Pin LQFP
2 Applications
• Monitoring and Control for Power Grids
• Protection Relays
• Multiphase Motor Controls
• Industrial Automation and Controls
• Multichannel Data Acquisition Systems
ADS8578S
AVDD
AIN_1P
AIN_1GND
1 M:
Clamp
Clamp
1 M:
PGA
3rd-Order
LPF
ADC
Driver
14-Bit
SAR
ADC
AIN_2P
AIN_2GND
1 M:
Clamp
Clamp
1 M:
PGA
3rd-Order
LPF
ADC
Driver
14-Bit
SAR
ADC
3 Description
The ADS8578S device is an 8-channel, integrated
data acquisition (DAQ) system based on a 14-bit
successive approximation (SAR) analog-to-digital
converter (ADC). All input channels are
simultaneously sampled to achieve a maximum
throughput of 200 kSPS per channel. The device
features a complete analog front-end for each
channel, including a programmable gain amplifier
(PGA) with high input impedance of 1 MΩ, input
clamp, low-pass filter, and an ADC input driver. The
device also features a low-drift, precision reference
with a buffer to drive the ADC. A flexible digital
interface supporting serial, parallel, and parallel byte
communication enables the device to be used with a
variety of host controllers.
The ADS8578S can be configured to accept ±10-V or
±5-V true bipolar inputs using a single 5-V supply.
The high input impedance allows direct connection
with sensors and transformers, thus eliminating the
need for external driver circuits. The high
performance and accuracy, along with zero-latency
conversions offered by this device, also make the
ADS8578S a great choice for many industrial
automation and control applications.
Device Information⁽¹⁾
PART NUMBER PACKAGE
BODY SIZE (NOM)
ADS8578S
LQFP (64)
10.00 mm × 10.00 mm
(1) For all available packages, see the orderable addendum at
the end of the datasheet.
DVDD
SAR
Logic
and
Digital Control
SER/PAR
Interface
BUSY
FRSTDATA
STBY
CONVSTA, CONVSTB
RESET
RANGE
CS
RD/SCLK
PAR/SER
DB[15:0]
DOUTA
DOUTB
AIN_7P
AIN_7GND
1 M:
Clamp
Clamp
1 M:
PGA
3rd-Order
LPF
ADC
Driver
AIN_8P
AIN_8GND
1 M:
Clamp
Clamp
1 M:
PGA
3rd-Order
LPF
ADC
Driver
AGND
14-Bit
SAR
ADC
14-Bit
SAR
ADC
Digital Filter
OS0
OS1
OS2
REFCAPA
REFCAPB
2.5 VREF
REFGND
REFIN/REFOUT
REFSEL
Copyright © 2017, Texas Instruments Incorporated
1
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.