參數(shù)資料
型號: PCA5010
廠商: NXP Semiconductors N.V.
英文描述: Pager baseband controller
中文描述: 傳呼機基帶控制器
文件頁數(shù): 50/112頁
文件大?。?/td> 627K
代理商: PCA5010
1998 Nov 02
50
Philips Semiconductors
Product specification
Pager baseband controller
PCA5010
Table 46
Description of DMD3 bits
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
BIT
SYMBOL
FUNCTION
DMD3.7
DMD3.6
DMD3.5
DMD3.4
DMD3.3
DMD3.2
DMD3.1
DMD3.0
D7
D6
D5
D4
D3
D2
D1
D0
Recovered symbols. The
number of relevant bits is
set with DMD2[2 to 0].
is at logic 1 a linear binary conversion is performed
according to Table 47.
Below 0.2 V the linearity of the output voltage is not ideal.
When ENB is logic 0 the AFCOUT pin is tied to V
SS
and all
currents are switched off.
Table 47
Coding of 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.
CODE
OUTPUT VOLTAGE
000000
000001
...
N
...
111111
0
1
×
1
64
V
DD
...
N
×
1
64
V
DD
...
63
×
1
64
V
DD
Table 48
AFC-DAC Control/Data Register (AFCON, SFR address 9EH)
Table 49
Description of the AFCON bits
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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