PCA5007 datasheet(46/112 Pages) PHILIPS

46 / 112 page

1998 Oct 07

Philips Semiconductors

Product speciﬁcation

Pager baseband controller

PCA5007

6.18

AFC-DAC

6.18.1

FUNCTION

The AFC digital-to-analog converter provides an analog signal to the receiver to reduce its frequency offset. The analog

signal is available at pin 18 (AFCOUT).

For low noise sensitivity the DAC output is buffered and can drive a load impedance of 10 k

Ω (max.). The output swing

is from rail-to-rail VDD. When the enable signal ENB is at logic 1 a linear binary conversion is performed according to

Table 47.

Below 0.2 V the linearity at the output voltage is not ideal.

When ENB is at logic 0 the AFCOUT pin is tied to VSS and all currents are switched off.

Table 47 Coding of the AFC-DAC

6.18.2

AFC-DAC CONTROL/DATA REGISTER (AFCON)

The AFC-DAC Control/Data register AFCON contains the control bit for enabling the AFC-DAC and the data bits for

setting the output voltage.

Table 48 AFC-DAC Control/Data Register (AFCON, SFR address 9EH)

Table 49 Description of the AFCON bits

CODE

OUTPUT VOLTAGE

000000

000001

× 1⁄

64VDD

...

× 1⁄

64VDD

...

111111

× 1⁄

64VDD

76543210

ENB

−

AFC5

AFC4

AFC3

AFC2

AFC1

AFC0

BIT

SYMBOL

FUNCTION

AFCON.7

ENB

enable DAC output

AFCON.6

−

not used.

AFCON.5

AFC5

6-bit value for DAC output according to Table 47

AFCON.4

AFC4

AFCON.3

AFC3

AFCON.2

AFC2

AFCON.1

AFC1

AFCON.0

AFC0

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