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ADS8688AIDBT bảng dữ liệu(PDF) 1 Page - Texas Instruments

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ADS8688AIDBT bảng dữ liệu(HTML) 1 Page - Texas Instruments

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-0.05
-0.03
-0.01
0.01
0.03
0.05
±40
±7
26
59
92
125
Free-Air Temperature (oC)
C039
---- ± 2.5*V
REF, ---- “ 1.25*VREF
---- “ 0.625*VREF, ------“0.3125*VREF
-------“0.156 VREF, ---- + 2.5*VREF
---- + 1.25*V
REF, ---- + 0.625*VREF
---- + 0.3125*V
REF
Oscillator
CS
SCLK
SDI
SDO
DAISY
REFSEL
RST / PD
REFCAP
REFIO
PGA
1 M:
OVP
1 M:
2nd-Order
LPF
ADC
Driver
VB0
AIN_0P
AIN_0GND
OVP
PGA
1 M:
OVP
1 M:
2nd-Order
LPF
ADC
Driver
VB1
AIN_1P
AIN_1GND
OVP
PGA
1 M:
OVP
1 M:
2nd-Order
LPF
ADC
Driver
VB2
AIN_2P
AIN_2GND
OVP
PGA
1 M:
OVP
1 M:
2nd-Order
LPF
ADC
Driver
VB3
AIN_3P
AIN_3GND
OVP
PGA
1 M:
OVP
1 M:
2nd-Order
LPF
ADC
Driver
VB4
AIN_4P
AIN_4GND
OVP
PGA
1 M:
OVP
1 M:
2nd-Order
LPF
ADC
Driver
VB5
AIN_5P
AIN_5GND
OVP
PGA
1 M:
OVP
1 M:
2nd-Order
LPF
ADC
Driver
VB6
AIN_6P
AIN_6GND
OVP
PGA
1 M:
OVP
1 M:
2nd-Order
LPF
ADC
Driver
VB7
AIN_7P
AIN_7GND
OVP
AUX_IN
AUX_GND
16-Bit
SAR ADC
Digital
Logic
and
Interface
4.096-V
Reference
REFGND
DGND
AGND
DVDD
AVDD
ADS8688A
ADS8684A
ALARM
Product
Folder
Sample &
Buy
Technical
Documents
Tools &
Software
Support &
Community
Reference
Design
ADS8684A, ADS8688A
SBAS680 – JULY 2015
ADS868xA 16-Bit, 500-kSPS, 4- and 8-Channel, Single-Supply, SAR ADCs with
Bipolar Input Ranges
1 Features
2 Applications
1
16-Bit ADCs with Integrated Analog Front-End
Power Automation
4-, 8-Channel MUX with Auto and Manual Scan
Protection Relays
Channel-Independent Programmable Inputs:
PLC Analog Input Modules
±10.24 V, ±5.12 V, ±2.56 V, ±1.28 V, ±0.64 V
3 Description
10.24 V, 5.12 V, 2.56 V, 1.28 V
The ADS8684A and ADS8688A are 4- and 8-
5-V Analog Supply: 1.65-V to 5-V I/O Supply
channel, integrated data acquisition systems based
Constant Resistive Input Impedance: 1 M
Ω
on a 16-bit successive approximation (SAR) analog-
to-digital converter (ADC), operating at a throughput
Input Overvoltage Protection: Up to ±20 V
of 500 kSPS. The devices feature integrated analog
On-Chip, 4.096-V Reference with Low Drift
front-end
circuitry
for
each
input
channel
with
Excellent Performance:
overvoltage protection up to ±20 V, a 4- or 8-channel
multiplexer with automatic and manual scanning
500-kSPS Aggregate Throughput
modes, and an on-chip, 4.096-V reference with low
DNL: ±0.5 LSB; INL: ±0.75 LSB
temperature drift. Operating on a single 5-V analog
Low Drift for Gain Error and Offset
supply, each input channel on the devices can
SNR: 92 dB; THD: –102 dB
support true bipolar input ranges of ±10.24 V,
±5.12 V, ±2.56 V, ±1.28V and ±0.64V, as well as
Low Power: 65 mW
unipolar input ranges of 0 V to 10.24 V, 0 V to 5.12 V,
AUX Input
→ Direct Connection to ADC Inputs
0 V to 2.56 V and 0 V to 1.28 V. The gain of the
ALARM
→ High and Low Thresholds per Channel
analog front-end for all input ranges is accurately
trimmed to ensure a high dc precision. The input
SPI™-Compatible Interface with Daisy-Chain
range
selection
is
software-programmable
and
Industrial Temperature Range: –40°C to 125°C
independent for each channel. The devices offer a
TSSOP-38 Package (9.7 mm × 4.4 mm)
1-M
Ω constant resistive input impedance irrespective
of the selected input range.
Block Diagram
The ADS8684A and ADS8688A offer a simple SPI-
compatible serial interface to the digital host and also
support daisy-chaining of multiple devices. The digital
supply operates from 1.65 V to 5.25 V, enabling
direct interface to a wide range of host controllers.
Device Information(1)
PART NUMBER
PACKAGE
BODY SIZE (NOM)
ADS868xA
TSSOP (38)
9.70 mm × 4.40 mm
(1) For all available packages, see the orderable addendum at
the end of the datasheet.
Gain Error versus Temperature
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.


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