ADS7945 datasheet(39/51 Pages) TI2

Part #	ADS7945

Description	14-Bit, 2 MSPS, Dual-Channel, Differential/Single-Ended, Ultralow-Power Analog-to-Digital Converters

PDF	51 Pages

Scroll/Zoom	100%

Manufacturer	TI2 [Texas Instruments]

Direct Link	https://www.ti.com

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39 / 51 page

DVDD

SCLK

SDO

AIN0P

AIN1P

AIN0N

AIN1N

470pF

5 W

1 F

Common Analog/

DigitalGroundPlane

Reference

Input

Analog

Supply

1 F

47 W

0.1 F

1 F

Digital

Supply

ADS7945

5 W

ADS7945

ADS7946

www.ti.com

SBAS539B

– JUNE 2011 – REVISED SEPTEMBER 2011

PCB LAYOUT/SCHEMATIC GUIDELINES: ADS7945

The ADS7945 is a mixed-signal device. For maximum performance, proper decoupling, grounding, and proper

termination of digital signals are essential. Figure 90 shows the essential components around the ADC. All

capacitors shown are ceramic. These decoupling capacitors must be placed close to the respective signal pins.

There is a 47

Ω source series termination resistor shown on the SDO signal. This resistor must be placed as

close to pin 15 as possible. Series terminations for SCLK and CS must be placed close to the host.

Figure 90. Recommended ADS7945 ADC Schematic

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ADS7945 Datasheet(PDF) 39 Page - Texas Instruments