參數(shù)資料
型號(hào): PCA5007
廠商: NXP Semiconductors N.V.
英文描述: Pager baseband controller
中文描述: 傳呼機(jī)基帶控制器
文件頁(yè)數(shù): 46/112頁(yè)
文件大小: 604K
代理商: PCA5007
1998 Oct 07
46
Philips Semiconductors
Product specification
Pager baseband controller
PCA5007
6.18
AFC-DAC
6.18.1
F
UNCTION
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
(max.). The output swing
is from rail-to-rail V
DD
. 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 V
SS
and all currents are switched off.
Table 47
Coding of the AFC-DAC
6.18.2
AFC-DAC C
ONTROL
/D
ATA
R
EGISTER
(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
...
N
...
111111
0
1
×
1
64
V
DD
...
N
×
1
64
V
DD
...
63
×
1
64
V
DD
7
6
5
4
3
2
1
0
ENB
AFC5
AFC4
AFC3
AFC2
AFC1
AFC0
BIT
SYMBOL
FUNCTION
AFCON.7
AFCON.6
AFCON.5
AFCON.4
AFCON.3
AFCON.2
AFCON.1
AFCON.0
ENB
AFC5
AFC4
AFC3
AFC2
AFC1
AFC0
enable DAC output
not used.
6-bit value for DAC output according to Table 47
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