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參數(shù)資料
| 型號： | PCD4440T |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 無繩電話/電話 |
| 英文描述： | Analog voice scrambler/descrambler |
| 中文描述： | TELECOM, CORDLESS, SCRAMBLER/DESCRAMBLER, PDSO8 |
| 封裝： | 7.50 MM, PLASTIC, SOT-176-1, SOP-8 |
| 文件頁數(shù)： | 7/20頁 |
| 文件大小： | 105K |
| 代理商： | PCD4440T |
1996 Dec 20
7
Philips Semiconductors
Product specification
Analog voice scrambler/descrambler
PCD4440T
7.2
Power supply (V
DD
, V
SS
)
The positive supply of the circuit (V
DD
) must meet the
voltage requirement as indicated in the characteristics.
To avoid undefined states of the device at power-on, an
internal reset circuit clears the logic. The power-on reset
has the highest priority; it blocks and resets the complete
circuit.
7.3
Oscillator (OSCI)
The time base for the PCD4440T is a 3.58 MHz input
signal which can be derived from the oscillator output
(OSCO) of Philips microcontroller families PCD33xxA or
PCF84CxxxA. Figure 4 shows the OSCI connection.
7.4
Splitting frequency and mode selection
Table 1 shows the input codes required to select the
various splitting frequencies, and the mute, transparent
and scramble/descramble modes. The codes form part of
the serial I
2
C-bus message input on the SDA line from the
microcontroller.
Table 1
Input data codes for splitting frequency and mode selection; note 1
Notes
1.
2.
Input codes other than shown in the table are not allowed.
Oscillator frequency = 3.58 MHz.
D3
D2
D1
D0
HEX
APPLICATION
f
s
(2)
(Hz)
0
0
0
0
0
0
0
1
1
1
1
1
0
0
0
1
1
1
1
0
0
0
0
1
0
1
1
0
0
1
1
0
0
1
1
1
1
0
1
0
1
0
1
0
1
0
1
1
01
02
03
04
05
06
07
08
09
0A
0B
0F
Mute mode
Select f
s
Select f
s
Select f
s
Select f
s
Select f
s
Select f
s
Select f
s
Select f
s
Select f
s
Transparent mode
Start scramble/descramble mode
2641
1853
1507
1279
1117
1018
899
837
767
handbook, full pagewidth
MGG731
27 pF
PCD4440T
PCD33xxA
PCF84CxxxA
MICROCONTROLLER
OSCI
3.58 MHz
OSCO
Fig.4 OSCI (oscillator input) connection.
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