ADS7038 ADC Datasheet

ADS7038 Datasheet, PDF, Equivalent


Part Number

ADS7038

Description

12-Bit ADC

Manufacture

etcTI

Total Page 30 Pages
Datasheet
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ADS7038
SBAS979A – JUNE 2019 – REVISED DECEMBER 2019
ADS7038 Small, 8-Channel, 12-Bit ADC With SPI Interface, GPIOs, and CRC
1 Features
1 Small package size:
– WQFN 3 mm × 3 mm
• 8 channels configurable as any combination of:
– Up to 8 analog inputs, digital inputs, or digital
outputs
• GPIOs for I/O expansion:
– Open-drain, push-pull digital outputs
• Analog watchdog:
– Programmable thresholds per channel
– Event counter for transient rejection
• Wide operating ranges:
– AVDD: 2.35 V to 5.5 V
– DVDD: 1.65 V to 5.5 V
– –40°C to +125°C temperature range
• Enhanced-SPI digital interface:
– High-speed, 60-MHz interface
– Achieve full throughput with >13.5-MHz SPI
• CRC for read/write operation:
– CRC on data read/write
– CRC on power-up configuration
• Programmable averaging filters:
– Programmable sample size for averaging
– Averaging with internal conversions
– 16-bit resolution
2 Applications
Macro remote radio units (RRU)
Battery management systems (BMS)
String inverters
Central inverters
3 Description
The ADS7038 is an easy-to-use, 8-channel,
multiplexed, 12-bit, 1-MSPS, successive
approximation register analog-to-digital converter
(SAR ADC). The eight channels can be
independently configured as either analog inputs,
digital inputs, or digital outputs. The device has an
internal oscillator for the ADC conversion process.
The ADS7038 communicates via an SPI-compatible
interface and operates in either autonomous or
single-shot conversion mode. The ADS7038
implements the analog watchdog function by event-
triggered interrupts per channel using a digital
window comparator with programmable high and low
thresholds, hysteresis, and an event counter. The
ADS7038 has a built-in cyclic redundancy check
(CRC) for data read/write operations and the power-
up configuration.
Device Information(1)
PART NUMBER
PACKAGE
BODY SIZE (NOM)
ADS7038
WQFN (16)
3.00 mm × 3.00 mm
(1) For all available packages, see the orderable addendum at
the end of the datasheet.
AIN0 / GPIO0
AIN1 / GPIO1
AIN2 / GPIO2
AIN3 / GPIO3
AIN4 / GPIO4
AIN5 / GPIO5
AIN6 / GPIO6
AIN7 / GPIO7
AVDD
MUX
ADS7038 Block Diagram and Applications
Device Block Diagram
DECAP
ADC
High/Low Threshold
± Hysteresis
Programmable
Averaging Filters
Digital Window
Comparator
DVDD
Example System Architecture
VCC
AVDD
OVP
Sequencer
Pin CFG
GPO Write
GPI Read
SPI Interface
and
CRC
Verification
CS
SCLK
SDI
SDO
GND
GPIO
OCP
MUX
ADC
OVP: Over voltage protection
OCP: Over current protection
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.

ADS7038
ADS7038
SBAS979A – JUNE 2019 – REVISED DECEMBER 2019
www.ti.com
Table of Contents
1 Features .................................................................. 1
2 Applications ........................................................... 1
3 Description ............................................................. 1
4 Revision History..................................................... 2
5 Device Comparison Table..................................... 3
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 ................................................ 7
7.7 Switching Characteristics .......................................... 7
7.8 Typical Characteristics .............................................. 9
8 Detailed Description ............................................ 13
8.1 Overview ................................................................. 13
8.2 Functional Block Diagram ....................................... 13
8.3 Feature Description................................................. 14
8.4 Device Functional Modes........................................ 23
8.5 ADS7038 Registers................................................. 27
9 Application and Implementation ........................ 67
9.1 Application Information............................................ 67
9.2 Typical Applications ................................................ 67
10 Power Supply Recommendations ..................... 70
10.1 AVDD and DVDD Supply Recommendations....... 70
11 Layout................................................................... 71
11.1 Layout Guidelines ................................................. 71
11.2 Layout Example .................................................... 71
12 Device and Documentation Support ................. 72
12.1 Receiving Notification of Documentation Updates 72
12.2 Community Resources.......................................... 72
12.3 Trademarks ........................................................... 72
12.4 Electrostatic Discharge Caution ............................ 72
12.5 Glossary ................................................................ 72
13 Mechanical, Packaging, and Orderable
Information ........................................................... 72
4 Revision History
NOTE: Page numbers for previous revisions may differ from page numbers in the current version.
Changes from Original (June 2019) to Revision A
Page
• Changed device status from advance information to production data ................................................................................... 1
2 Submit Documentation Feedback
Product Folder Links: ADS7038
Copyright © 2019, Texas Instruments Incorporated


Features Product Folder Order Now Technical Doc uments Tools & Software Support & Com munity ADS7038 SBAS979A – JUNE 2019 – REVISED DECEMBER 2019 ADS7038 Small , 8-Channel, 12-Bit ADC With SPI Interf ace, GPIOs, and CRC 1 Features •1 Sm all package size: – WQFN 3 mm × 3 mm • 8 channels configurable as any com bination of: – Up to 8 analog inputs, digital inputs, or digital outputs • GPIOs for I/O expansion: – Open-drai n, push-pull digital outputs • Analog watchdog: – Programmable thresholds per channel – Event counter for trans ient rejection • Wide operating range s: – AVDD: 2.35 V to 5.5 V – DVDD: 1.65 V to 5.5 V – –40°C to +125°C temperature range • Enhanced-SPI dig ital interface: – High-speed, 60-MHz interface – Achieve full throughput w ith >13.5-MHz SPI • CRC for read/writ e operation: – CRC on data read/write – CRC on power-up configuration • Programmable averaging filters: – Pro grammable sample size for averaging – Averaging with internal conversions – 16-bit resolution 2 Applications • Ma.
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