Analog-to-Digital Converter. ADS7851 Datasheet

ADS7851 Converter. Datasheet pdf. Equivalent

Part ADS7851
Description Analog-to-Digital Converter
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ADS7851
Product
Folder
Sample &
Buy
Technical
Documents
Tools &
Software
Support &
Community
ADS7251, ADS7851
SBAS587A – JANUARY 2014 – REVISED APRIL 2014
ADS7x51 12-Bit, 2-MSPS and 14-Bit, 1.5-MSPS, Dual, Differential Input, Simultaneous-
Sampling, Analog-to-Digital Converters with Internal Reference
1 Features
1 12- and 14-Bit Pin-Compatible Family
• Simultaneous Sampling of Two Channels
• Supports Fully-Differential Analog Inputs
• Independent Internal Reference (per ADC)
• High Speed:
– Up to 2 MSPS with the ADS7251 (12-Bit)
– Up to 1.5 MSPS with the ADS7851 (14-Bit)
• Excellent Performance:
– ADS7251:
– SNR: 73 dB
– INL: ±1 LSB
– ADS7851:
– SNR: 83.5 dB
– INL: ±2 LSB
• Fully-Specified Over the Extended Industrial
Temperature Range: –40°C to +125°C
• Small Footprint: WQFN-16 (3 mm × 3 mm)
2 Applications
• Motor Control: Direct Interface to 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 ADS7251 and ADS7851 belong to a family of
pin-compatible, dual, high-speed, simultaneous-
sampling, analog-to-digital converters (ADCs) that
support fully-differential analog inputs and feature two
independent internal voltage references. The
ADS7251 offers 12-bit resolution and up to 2-MSPS
sampling speed. The ADS7851 offers 14-bit
resolution and up to 1.5-MSPS sampling speed.
The devices support a wide digital supply voltage
range, allowing easy communication with a variety of
digital host controllers using a simple, serial interface.
Both devices are fully specified over the extended
industrial temperature range (–40°C to +125°C) and
are available in a pin-compatible, space-saving,
WQFN-16 (3-mm × 3-mm) package.
Device Information
ORDER NUMBER
PACKAGE
BODY SIZE
ADS7251RTE
WQFN (16)
3 mm × 3 mm
ADS7851RTE
WQFN (16)
3 mm × 3 mm
Typical Application Diagram
C
ADS7851,
R
ADS7251
AINP
VCM
+V
+V
+V
AINM
R
C
C
Internal
Reference
R
VCM
+V
+V
+V
AINP
AINM
R
C
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.



ADS7851
ADS7251, ADS7851
SBAS587A – JANUARY 2014 – REVISED APRIL 2014
www.ti.com
Table of Contents
1 Features .................................................................. 1
2 Applications ........................................................... 1
3 Description ............................................................. 1
4 Revision History..................................................... 2
5 Terminal Configuration and Functions................ 3
6 Specifications......................................................... 4
6.1 Absolute Maximum Ratings ..................................... 4
6.2 Handling Ratings....................................................... 4
6.3 Recommended Operating Conditions....................... 4
6.4 Thermal Information .................................................. 4
6.5 Electrical Characteristics: ADS7251 ......................... 5
6.6 Electrical Characteristics: ADS7851 ......................... 6
6.7 Electrical Characteristics: Common .......................... 7
6.8 ADS7251 Timing Characteristics .............................. 8
6.9 ADS7851 Timing Characteristics .............................. 9
6.10 Typical Characteristics: ADS7251 ........................ 10
6.11 Typical Characteristics: ADS7851 ........................ 13
6.12 Typical Characteristics: Common ......................... 16
7 Detailed Description ............................................ 17
7.1 Overview ................................................................. 17
7.2 Functional Block Diagram ....................................... 17
7.3 Feature Description................................................. 18
7.4 Device Functional Modes........................................ 21
8 Application and Implementation ........................ 23
8.1 Application Information............................................ 23
8.2 Typical Application ................................................. 23
9 Power Supply Recommendations...................... 27
10 Layout................................................................... 28
10.1 Layout Guidelines ................................................. 28
10.2 Layout Example .................................................... 28
11 Device and Documentation Support ................. 29
11.1 Documentation Support ........................................ 29
11.2 Related Links ........................................................ 29
11.3 Trademarks ........................................................... 29
11.4 Electrostatic Discharge Caution ............................ 29
11.5 Glossary ................................................................ 29
12 Mechanical, Packaging, and Orderable
Information ........................................................... 29
4 Revision History
Changes from Original (January 2014) to Revision A
Page
• Changed format to meet latest data sheet standards; added Layout section, moved existing sections ............................... 1
• Deleted Ordering Information table ........................................................................................................................................ 3
• Changed Supply Current, IDVDD parameter typical specification in Electrical Characteristics: ADS7251 table...................... 5
• Changed Supply Current, IDVDD parameter typical specification in Electrical Characteristics: ADS7851 table...................... 6
• Changed Input Voltage column in Table 1 ........................................................................................................................... 20
2
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