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ADS8350, ADS7850, ADS7250
SBAS580D – MAY 2013 – REVISED MARCH 2018
ADSxx50 Dual, 750-kSPS, 16-, 14-, and 12-Bit, Simultaneous-Sampling, Analog-to-Digital Converters
1 Features
•1 16-, 14-, and 12-Bit Pin-Compatible Family • Simultaneously Samples Two Channels • Pseudo-Differential Analog Inputs • Fast Throughput: 750 kSPS • Excellent DC Performance:
– Linearity: – ADS8350: 16-Bit NMC DNL, ±2.5 LSB, Max INL – ADS7850: 14-Bit NMC DNL, ±1.5 LSB, Max INL – ADS7250: 12-Bit NMC DNL, ±1 LSB, Max INL
• Excellent AC Performance: – ADS8350: 85-dB SNR, –96-dB THD – ADS7850: 81-dB SNR, –90-dB THD – ADS7250: 73-dB SNR, –88-dB THD
• Simple Serial Interface • Fully-Specified Over Extended Industrial
Temperature Range: –40°C to 125°C • Small Footprint: WQFN-16 (3 mm × 3 mm)
2 Applications
• Motor Control: Position Measurement Using SinCos Encoders
• Optical Networking: EDFA Gain Control Loop
• Protection Relays • Power Quality Measurement • Three-Phase Power Controls • Programmable Logic Controllers • Industrial Automation
3 Description
The ADS8350, ADS7850, and ADS7250 devices belong to a family of pin-compatible, dual, highspeed, simultaneous-sampling, analog-to-digital converters (ADCs) that support pseudo-differential analog inputs. All devices support a simple serial interface that can operate over a wide power-supply range, enabling easy communication with a large variety of host controllers.
All devices are fully specified over the extended industrial temperature range (–40°C to 125°C) and are available in a pin-compatible, WQFN-16 (3 mm × 3 mm) package.
Device Information(1)
PART NUMBER
PACKAGE
BODY SIZE (NOM)
ADS7250
ADS7850
WQFN (16)
3.00 mm × 3.00 mm
ADS8350
(1) For all available packages, see the orderable addendum at the end of the datasheet.
Functional Block Diagram
OPA322 ++
+V
OPA322 ++ +V
ADS7250, ADS7850, ADS8350 AINP
AINM
VREF
AINM
OPA322 + -+
+V
OPA322 + -+ +V
AINP
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.
ADS8350, ADS7850, ADS7250
SBAS580D – MAY 2013 – REVISED MARCH 2018
www.ti.com
Table of Contents
1 Features .................................................................. 1 2 Applications ........................................................... 1 3 Description ............................................................. 1 4 Revision History..................................................... 2 5 Pin Configuration and Functions ......................... 3 6 Specifications......................................................... 4
6.1 Absolute Maximum Ratings ...................................... 4 6.2 ESD Ratings.............................................................. 4 6.3 Recommended Operating Conditions....................... 4 6.4 Thermal Information .................................................. 4 6.5 Electrical Characteristics: All Devices....................... 5 6.6 Electrical Characteristics: ADS7250 ......................... 6 6.7 Electrical Characteristics: ADS7850 ......................... 7 6.8 Electrical Characteristics: ADS8350 ......................... 8 6.9 Timing Requirements ................................................ 9 6.10 Switching Characteristics ........................................ 9 6.11 Typical Characteristics: ADS7250 ........................ 10 6.12 Typical Characteristics: ADS7850 ........................ 13 6.13 Typical Characteristics: ADS8350 ........................ 16 6.14 Typical Characteristics: All Devices ...................... 19 7 Detailed Description ............................................ 20
7.1 Overview ................................................................. 20 7.2 Functional Block Diagram ....................................... 20 7.3 Feature Description................................................. 21 7.4 Device Functional Modes........................................ 24 8 Application and Implementation ........................ 26 8.1 Application Information............................................ 26 8.2 Typical Applications ................................................ 26 9 Power Supply Recommendations...................... 33 10 Layout................................................................... 34 10.1 Layout Guidelines ................................................. 34 10.2 Layout Example .................................................... 34 11 Device and Documentation Support ................. 35 11.1 Documentation Support ........................................ 35 11.2 Related Links ........................................................ 35 11.3 Receiving Notification of Documentation Updates 35 11.4 Community Resources...................