ADS8331IBRGET datasheet(34/43 Pages) TI

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Host

Processor

FS/CS

SDO

SDI

SCLK

CONVST

EOC/INT

4.7 F

REF+

AGND

Analog+5V

ADS8331/32

REF-

22mF

External

Reference

Input

AGND

X COM

Interface

Supply

+1.8V

DGND

VBD

AnalogInput

AGND

MUXOUT ADCIN

4.7 F

ADS8331

ADS8332

SBAS363 – DECEMBER 2009

www.ti.com

APPLICATION INFORMATION

TYPICAL CONFIGURATION EXAMPLE

Figure 51 illustrates a typical circuit configuration using the ADS8331/32.

Figure 51. Typical Circuit Configuration

POWER-ON SEQUENCE TIMING

During power-on of the ADS8331/32, the digital interface supply voltage (VBD) should not exceed the analog

supply voltage (VA). This condition is specified in the Power-Supply Requirements section of the Electrical

Characteristics tables. If the analog and digital interface supplies for the converter are not generated by a single

voltage source, it is recommended to power-on the analog supply and wait for it to reach its final value before the

digital interface supply is activated. Furthermore, the voltages applied to the analog input pins (INX, ADCIN) and

digital input pins (RESET, FS/CS, SCLK, SDI, and CONVST) should not exceed the voltages on VA and VBD,

respectively, during the power-on sequence. This requirement prevents these input pins from powering the

ADS8331/32 through the ESD protection diodes/circuitry and causing a latch-up condition (see the Electrical

Characteristic tables and Figure 34 for further details).

Communication with the ADS8331/32, such as initiating a conversion with CONVST or writing to the

Configuration register, should not occur for a minimum of 2

μs after the analog and digital interface supplies have

finished the power-on sequence and reached the respective final values in the system. This time is required for

the internal POR to activate and place the digital core of the device into the default mode of operation. This

minimum delay time must also be adhered to whenever a reset condition occurs (see the Reset Function section

for additional information).

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ADS8331IBRGET Datasheet(PDF) 34 Page - Texas Instruments

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