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ADS8695IRUMR bảng dữ liệu(PDF) 1 Page - Texas Instruments

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Giải thích chi tiết về linh kiện  18-Bit, High-Speed, Single-Supply, SAR ADC Data Acquisition System with Programmable, Bipolar Input Ranges
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Oscillator
CONVST/CS
PGA
1 M:
OVP
1 M:
OVP
2
nd-Order
LPF
ADC
Driver
VBIAS
AIN_P
AIN_GND
4.096-V
Reference
REFGND
DGND
AGND
DVDD
AVDD
Digital Logic
and Interface
REFIO
REFCAP
SCLK
SDI
SDO
18-Bit
SAR ADC
ADS869x
Copyright © 2016, Texas Instruments Incorporated
Product
Folder
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Buy
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Documents
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Software
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Community
Reference
Design
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.
ADS8691, ADS8695, ADS8699
SBAS777 – DECEMBER 2016
ADS869x 18-Bit, High-Speed, Single-Supply, SAR ADC Data Acquisition System
with Programmable, Bipolar Input Ranges
1
1 Features
1
18-Bit ADC with Integrated Analog Front-End
High Speed:
ADS8691: 1 MSPS
ADS8695: 500 kSPS
ADS8699: 100 kSPS
Software Programmable Input Ranges:
Bipolar Ranges: ±12.288 V, ±10.24 V,
±6.144 V, ±5.12 V, and ±2.56 V
Unipolar Ranges: 0 V–12.288 V, 0 V–10.24 V,
0 V–6.144 V, and 0 V–5.12 V
5-V Analog Supply: 1.65-V to 5-V I/O Supply
Constant Resistive Input Impedance
≥ 1 MΩ
Input Overvoltage Protection: Up to ±20 V
On-Chip, 4.096-V Reference with Low Drift
Excellent Performance:
DNL: ±0.6 LSB; INL: ±1.75 LSB
SNR: 92.5 dB; THD: –110 dB
ALARM
→ High, Low Thresholds per Channel
multiSPI™ Interface with Daisy-Chain
Extended Industrial Temperature Range:
–40°C to +125°C
2 Applications
Channel-Isolated PLC Analog Input Modules
Test and Measurement
Battery Pack Monitoring
3 Description
The ADS8691, ADS8695, and ADS8699 devices
belong to a family of integrated data acquisition
system based on a successive approximation (SAR)
analog-to-digital
converter
(ADC).
The
devices
feature a high-speed, high-precision SAR ADC,
integrated analog front-end (AFE) input driver circuit,
overvoltage protection circuit up to ±20 V, and an on-
chip
4.096-V
reference
with
extremely
low
temperature drift.
The devices operate on a single 5-V analog supply,
but support true bipolar input ranges of ±12.288 V,
±6.144 V, ±10.24 V, ±5.12 V, and ±2.56 V, as well as
unipolar input ranges of 0 V to 12.288 V, 0 V to
10.24 V, 0 V to 6.144 V, and 0 V to 5.12 V. The gain
and offset errors are accurately trimmed within the
specified values for each input range to ensure high
dc precision. The input range selection is done by
software programming of the device internal registers.
The devices offer a high resistive input impedance
(
≥ 1 MΩ) irrespective of the selected input range.
The multiSPI digital interface is backward-compatible
to
the
traditional
SPI
protocol.
Additionally,
configurable features simplify interface to a wide
range of host controllers.
Device Information(1)
PART NUMBER
PACKAGE
BODY SIZE (NOM)
ADS869x
TSSOP (16)
5.00 mm × 4.40 mm
WQFN (16)
4.00 mm × 4.00 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
Block Diagram


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