AS87196CB datasheet(28/33 Pages) INTEL

28 / 33 page

87C196CA87C196CB

WAVEFORMSERIAL PORTSHIFT REGISTER MODE

SERIAL PORT WAVEFORMSHIFT REGISTER MODE

272405 – 29

A TO D CHARACTERISTICS

The sample and conversion time of the AD convert-

er in the 8-bit or 10-bit modes is programmed by

loading a byte into the AD

TIME Special Function

for specific applications The AD

TIME register is

functional for all possible values but the accuracy of

the AD converter is only guaranteed for the times

specified in the operating conditions table

The value loaded into AD

TIME bits 5 6 7 deter-

mines the sample time SAMP The value loaded

into AD

TIME bits 0 1 2 3 and 4 determines the

bit conversion time CONV These bits as well as

the equation for calculating the total conversion

time T are shown in the following table

TIME

1FAFHByte

76543210

Sample Time

Bit Conversion Time

(SAMP)

(CONV)

4n a 1 state times

n a1 state times

n e 1to7

n e 2to31

Equation

T e (SAMP) a Bx (CONV) a 25

T e total conversion time (states)

B e number of bits conversion (8 or 10)

n e programmed register value

The converter is ratiometric so absolute accuracy is

dependent on the accuracy and stability of VREF

VREF must be close to VCC since it supplies both the

resistor ladder and the analog portion of the convert-

er and input port pins There is also an AD

TEST

SFR that allows for conversion on ANGND and

VREF as well as adjusting the zero offset The abso-

lute error listed is without doing any adjustments

AD CONVERTER SPECIFICATION

The specifications given assume adherence to the

operating conditions section of this data sheet Test-

ing is performed with VREF e 512V and 20 MHz

operating frequency After a conversion is started

the device is placed in IDLE mode until the conver-

sion is complete

AS87196CB データシート(PDF) 28 Page - Intel Corporation

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