ADS8862 Converter Datasheet

ADS8862 Datasheet, PDF, Equivalent


Part Number

ADS8862

Description

SAR Analog-to-Digital Converter

Manufacture

etcTI

Total Page 30 Pages
Datasheet
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ADS8862
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ADS8862
SBAS570B – MAY 2013 – REVISED FEBRUARY 2019
ADS8862 16-bit, 680-kSPS, serial interface, micropower, miniature,
single-ended input, SAR analog-to-digital converter
1 Features
1 Sample rate: 680 kHz
• No latency output
• Unipolar, single-ended input range:
0 to +VREF
• SPI™-compatible serial interface with
daisy-chain option
• Excellent AC and DC performance:
– SNR: 93 dB, THD: –108 dB
– INL: ±1.0 LSB (typ), ±2.0 LSB (max)
– DNL: ±1.0 LSB (max), 16-Bit NMC
• Wide operating range:
– AVDD: 2.7 V to 3.6 V
– DVDD: 1.65 V to 3.6 V
(independent of AVDD)
– REF: 2.5 V to 5 V (independent of AVDD)
– Operating temperature: –40°C to +85°C
• Low-power dissipation:
– 4.2 mW at 680 kSPS
– 0.6 mW at 100 kSPS
– 60 µW at 10 kSPS
• Power-down current (AVDD): 50 nA
• Full-scale step settling to 16 Bits: 540 ns
• Packages: VSSOP-10 and VSON-10
2 Applications
• Automatic test equipment (ATE)
• Instrumentation and process controls
• Precision medical equipment
• Low-power, battery-operated instruments
3 Description
The ADS8862 is a 16-bit, 680-kSPS, single-ended
input, analog-to-digital converter (ADC). The device
operates with a 2.5-V to 5-V external reference,
offering a wide selection of signal ranges without
additional input signal scaling. The reference voltage
setting is independent of, and can exceed, the analog
supply voltage (AVDD).
The device offers an SPI-compatible serial interface
that also supports daisy-chain operation for
cascading multiple devices. An optional busy-
indicator bit makes synchronizing with the digital host
easy.
The device supports unipolar single-ended analog
inputs in the range of –0.1 V to VREF + 0.1 V.
Device operation is optimized for very low-power
operation. Power consumption directly scales with
speed. This feature makes the ADS8862 excellent for
lower-speed applications.
Device Information(1)
PART NUMBER
PACKAGE
BODY SIZE (NOM)
ADS8862
VSSOP (10)
VSON (10)
3.00 mm × 3.00 mm
3.00 mm × 3.00 mm
(1) For all available packages, see the orderable addendum at
the end of the datasheet.
No Separate LDO Required for the ADC Supply
2.5 V to 5 V
2.7 V to 3.6 V
0 V - VREF
REF
AVDD DVDD
AINP
AINN
ADS8862
DIN
SCLK
DOUT
CONVST
GND
Digital Host
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.

ADS8862
ADS8862
SBAS570B – MAY 2013 – REVISED FEBRUARY 2019
www.ti.com
Table of Contents
1 Features .................................................................. 1
2 Applications ........................................................... 1
3 Description ............................................................. 1
4 Revision History..................................................... 2
5 Device Comparison Table..................................... 4
6 Pin Configuration and Functions ......................... 4
7 Specifications......................................................... 5
7.1 Absolute Maximum Ratings ...................................... 5
7.2 ESD Ratings.............................................................. 5
7.3 Recommended Operating Conditions....................... 5
7.4 Thermal Information .................................................. 5
7.5 Electrical Characteristics........................................... 6
7.6 Timing Requirements: 3-Wire Operation .................. 8
7.7 Timing Requirements: 4-Wire Operation .................. 8
7.8 Timing Requirements: Daisy-Chain .......................... 9
7.9 Typical Characteristics ............................................ 11
8 Parameter Measurement Information ................ 18
8.1 Equivalent Circuits .................................................. 18
9 Detailed Description ............................................ 19
9.1 Overview ................................................................. 19
9.2 Functional Block Diagram ....................................... 19
9.3 Feature Description................................................. 19
9.4 Device Functional Modes........................................ 21
10 Application and Implementation........................ 30
10.1 Application Information.......................................... 30
10.2 Typical Applications .............................................. 32
11 Power Supply Recommendations ..................... 35
11.1 Power-Supply Decoupling..................................... 35
11.2 Power Saving ........................................................ 35
12 Layout................................................................... 37
12.1 Layout Guidelines ................................................. 37
12.2 Layout Example .................................................... 37
13 Device and Documentation Support ................. 38
13.1 Documentation Support ........................................ 38
13.2 Receiving Notification of Documentation Updates 38
13.3 Community Resources.......................................... 38
13.4 Trademarks ........................................................... 38
13.5 Electrostatic Discharge Caution ............................ 38
13.6 Glossary ................................................................ 39
14 Mechanical, Packaging, and Orderable
Information ........................................................... 39
4 Revision History
NOTE: Page numbers for previous revisions may differ from page numbers in the current version.
Changes from Revision A (December 2013) to Revision B
Page
• Added Device Information table, ESD Ratings table, Recommended Operating Conditions table, Parametric
Measurement Information section, Feature Description section, Device Functional Modes section, Application and
Implementation section, Power Supply Recommendations section, Layout section, Device and Documentation
Support section, and Mechanical, Packaging, and Orderable Information section................................................................ 1
• Changed analog input from pseudo-differential to single-ended throughout document......................................................... 1
• Changed MSOP to VSSOP throughout document ................................................................................................................ 1
• Changed title of Device Comparison Table from Family Information..................................................................................... 4
• Changed footnotes of Family Information table...................................................................................................................... 4
• Changed LSB footnote in Electrical Characteristics table to include how to convert LSB to ppm ........................................ 6
• Added more information about validity of data on SCLK edges in all interface modes ....................................................... 22
• Changed diagrams and text for better explanation of the daisy-chain feature in the Daisy-Chain Mode section ............... 27
• Changed Equation 1 and Equation 2 ................................................................................................................................... 30
• Changed Charge-Kickback Filter section title and functionality description ........................................................................ 31
Changes from Original (May 2013) to Revision A
Page
• Changed sub-bullets of AC and DC performance Features bullet ......................................................................................... 1
• Changed Full-scale step settling Features bullet ................................................................................................................... 1
• Deleted last two Applications bullets ...................................................................................................................................... 1
• Changed Description section.................................................................................................................................................. 1
• Changed front page graphic ................................................................................................................................................... 1
• Added Family Information, Absolute Maximum Ratings, and Thermal Information tables..................................................... 4
• Added Pin Configurations section .......................................................................................................................................... 4
• Added Electrical Characteristics table .................................................................................................................................... 6
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Features Product Folder Order Now Technical Doc uments Tools & Software Support & Com munity Reference Design ADS8862 SBAS5 70B – MAY 2013 – REVISED FEBRUARY 2 019 ADS8862 16-bit, 680-kSPS, serial in terface, micropower, miniature, single- ended input, SAR analog-to-digital conv erter 1 Features •1 Sample rate: 680 kHz • No latency output • Unipolar , single-ended input range: 0 to +VREF • SPI™-compatible serial interface with daisy-chain option • Excellent A C and DC performance: – SNR: 93 dB, T HD: –108 dB – INL: ±1.0 LSB (typ), ±2.0 LSB (max) – DNL: ±1.0 LSB (ma x), 16-Bit NMC • Wide operating range : – AVDD: 2.7 V to 3.6 V – DVDD: 1. 65 V to 3.6 V (independent of AVDD) – REF: 2.5 V to 5 V (independent of AVDD ) – Operating temperature: –40°C t o +85°C • Low-power dissipation: – 4.2 mW at 680 kSPS – 0.6 mW at 100 k SPS – 60 µW at 10 kSPS • Power-dow n current (AVDD): 50 nA • Full-scale step settling to 16 Bits: 540 ns • Packages: VSSOP-10 and VSON-10 2 Applications • Automatic test equipment (ATE) • .
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