Texas Instruments ADS8686S Handleiding
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ADS8686S 16-Channel, 16-Bit, 1-MSPS, Dual, Simultaneous-Sampling ADC With
Integrated Analog Front-End
1 Features
•16-channel, 16-bit ADC with integrated analog
front-end
•Dual simultaneous sampling: 8x2 channels
•Supply:
–Analog: 5 V
–Digital: 1.8 V to 5 V
•Constant 1-MΩ input impedance front-end
•Independently programmable input ranges with
20% overrange
•Programmable low-pass filter:
–15 kHz, 39 kHz, 376 kHz
•Excellent DC and AC performance
•On-chip reference and reference buffer
•Excellent over temperature performance
•Overvoltage input clamp with 8-kV ESD
•Optional cyclic redundancy check (CRC) error
checking
•On-chip self diagnostic function
•Temperature range: –40°C to +125°C
2 Applications
•Multifunction relays
•Servo drive position sensors
•Analog input modules
•Data acquisition (DAQ)
3 Description
The ADS8686S is a 16-channel data acquisition
(DAQ) system based on a dual simultaneous-
sampling, 16-bit successive approximation register
(SAR) analog-to-digital converter (ADC). The
ADS8686S features a complete analog front-end
for each channel with an input clamp, 1-MΩ
input impedance, independently programmable gain
amplifier (PGA), programmable low-pass filter, and an
ADC input driver. The device also features a low-drift,
precision reference with a buffer to drive the ADCs. A
flexible digital interface supporting serial, parallel, and
byte communication enables the device to be used
with a variety of host controllers.
The ADS8686S can be configured to accept ±10-
V, ±5-V, or ±2.5-V bipolar inputs with a 20%
overrange option 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 ADS8686S has a
highly configurable channel sequencer to reduce the
sequencing overhead on the backend controller or
processor. The high performance and accuracy, along
with zero-latency conversions offered by this device
make the ADS8686S a great choice for multiple
industrial applications.
Device Information
(1)
PART NUMBERPACKAGEBODY SIZE (NOM)
ADS8686SLQFP (80)14.00 mm x 14.00 mm
(1)For all available packages, see the orderable addendum at
the end of the data sheet.
DGNDAGND
DVDD
AVDD
ADC
Driver
Serial - Parallel -
Byte Interface
1 M
Clamp
2
nd
Order
PROG
LPF
Clamp
PGA
AIN_nA
AIN_nAGND
1 M
9:1
MUX
2:1
MUX
AVDD
ALDO
ADS8686S
16-BIT
SAR
REFIOREFSELREGCAP
ALDO
2.5 V
REF
REGCAPD
DLDO
REFCAP
CH0A
CH7A
ADC
Driver
1 M
Clamp
2
nd
Order
PROG
LPF
Clamp
PGA
AIN_nB
AIN_nBGND
1 M
9:1
MUX
CH0B
CH7B
16-BIT
SAR
Digital OSR Filter
Channel Sequencer
Burst Capture
CRC
Self Diagnosys
Dual Simultaneous
Sampling
DB[15:0]
SER/BYTE/PAR
SDOx/SDI
SER1W
OSR
RESET
CONVST
BUSY
Device Block Diagram
ADS8686S
SBAS905C – NOVEMBER 2019 – REVISED JULY 2020
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.
Table of Contents
1 Features............................................................................1
2 Applications.....................................................................1
3 Description.......................................................................1
4 Revision History..............................................................2
5 Pin Configuration and Functions...................................3
6 Specifications..................................................................7
6.1 Absolute Maximum Ratings........................................7
6.2 ESD Ratings...............................................................7
6.3 Recommended Operating Conditions.........................8
6.4 Thermal Information....................................................8
6.5 Electrical Characteristics.............................................9
6.6 Timing Requirements................................................15
6.7 Switching Characteristics..........................................16
6.8 Timing Diagrams: Universal......................................18
6.9 Timing Diagrams: Parallel Data Read.......................20
6.10 Timing Diagrams: Serial Data Read........................21
6.11 Typical Characteristics............................................22
7 Detailed Description......................................................29
7.1 Overview...................................................................29
7.2 Functional Block Diagram.........................................29
7.3 Feature Description...................................................30
7.4 Device Functional Modes..........................................38
7.5 Programming............................................................57
7.6 Register Maps...........................................................63
8 Application and Implementation................................102
8.1 Application Information...........................................102
8.2 Typical Applications................................................102
9 Power Supply Recommendations..............................106
9.1 Power Supplies.......................................................106
10 Layout.........................................................................107
10.1 Layout Guidelines.................................................107
10.2 Layout Examples..................................................107
11 Device and Documentation Support........................108
11.1 Device Support......................................................108
11.2 Documentation Support........................................108
11.3 Receiving Notification of Documentation Updates108
11.4 Support Resources...............................................108
11.5 Trademarks...........................................................108
11.6 Electrostatic Discharge Caution............................108
11.7 Glossary................................................................108
4 Revision History
Changes from Revision B (May 2020) to Revision C (July 2020)Page
•Changed AC performance parameters...............................................................................................................9
Changes from Revision A (March 2020) to Revision B (May 2020)Page
•Changed device status from advance information to production data ...............................................................1
ADS8686S
SBAS905C – NOVEMBER 2019 – REVISED JULY 2020
www.ti.com
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Copyright © 2022 Texas Instruments Incorporated
Product Folder Links: ADS8686S
5 Pin Configuration and Functions
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
61
62
6364
AIN
_3BGND
AIN
_3B
AIN
_2BGND
AIN
_2
B
65
6667
68
AIN
_1
BGND
AIN
_1B
AIN
_0BGND
AIN
_0B
697071
72
AGND
AVDD
REGCAP
REGGND
73
747576
CONVST
BUSY
CHSEL
2
CHSEL
1
77787980
CHSEL
0
CS
SCLK
/RD
WR
/BURST
4039
38
37363534
33
32
3130
29282726
2524232221
DB15/0S2
DB14/0S1
DB13/0S0
DB12/SDOA
DB11/SDOB
DB10/SDI
DB9/BYTESEL
DB8
REGCAPD
REGGNDD
DGND
DVDD
DB7
DB6
DB5/CRCEN
DB4/SER1W
DB3
DB2
DB1
DB0
60
59
58
57
56
55
54
53
52
51
50
49
48
47
46
45
44
43
42
41
(Not to Scale)
ADS8686S
TOP VIEW
AIN
_3AGND
AIN
_3A
AIN
_2AGND
AIN
_2A
AIN
_1AGND
AIN
_1A
AIN
_0AGND
AIN
_
0A
AGND
AVDD
REFCAP
REFGND
REFIO
REFIO
_GND
REFSEL
RESET
SEQEN
HW
_RNGSEL
1
SER
/BYTE
/PAR
HW
_RNGSEL0
AIN
_4BGND
AIN
_4B
AIN
_5
BGND
AIN
_5
B
AGND
AVDD
AIN
_6B
AIN
_6BGND
AIN
_7
B
AIN
_7BGND
AIN
_7AGND
AIN
_7A
AIN
_6AGND
AIN
_6A
AVDD
AGND
AIN
_5A
AIN
_5AGND
AIN
_4A
AIN
_4AGND
Figure 5-1. PM Package: PZA, 80-Pin LQFP (Top View)
Table 5-1. Pin Functions
NAMENO.TYPE
(1)
DESCRIPTION
AGND5, 16, 29, 72PAnalog supply ground pins
AIN_0AGND27AIAnalog input channel 0A: negative input
AIN_0A28AIAnalog input channel 0A: positive input
AIN_0BGND74AIAnalog input channel 0B: negative input
AIN_0B73AIAnalog input channel 0B: positive input
AIN_1AGND25AIAnalog input channel 1A: negative input
AIN_1A26AIAnalog input channel 1A: positive input
AIN_1BGND76AIAnalog input channel 1B: negative input
AIN_1B75AIAnalog input channel 1B: positive input
AIN_2AGND23AIAnalog input channel 2A: negative input
AIN_2A24AIAnalog input channel 2A: positive input
AIN_2BGND78AIAnalog input channel 2B: negative input
AIN_2B77AIAnalog input channel 2B: positive input
AIN_3AGND21AIAnalog input channel 3A: negative input
AIN_3A22AIAnalog input channel 3A: positive input
AIN_3BGND80AIAnalog input channel 3B: negative input
AIN_3B79AIAnalog input channel 3B: positive input
AIN_4AGND20AIAnalog input channel 4A: negative input
AIN_4A19AIAnalog input channel 4A: positive input
AIN_4BGND1AIAnalog input channel 4B: negative input
AIN_4B2AIAnalog input channel 4B: positive input
www.ti.com
ADS8686S
SBAS905C – NOVEMBER 2019 – REVISED JULY 2020
Copyright © 2022 Texas Instruments Incorporated
Submit Document Feedback
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Product Folder Links: ADS8686S
Product specificaties
| Merk: | Texas Instruments |
| Categorie: | Niet gecategoriseerd |
| Model: | ADS8686S |
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