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參數(shù)資料
| 型號(hào)： | PCT789T-A |
| 英文描述： | PCI HSP56 World MicroModem/PCT303DW/PCT1789W |
| 中文描述： | 世界MicroModem/PCT303DW/PCT1789W的PCI HSP56 |
| 文件頁數(shù)： | 16/70頁 |
| 文件大?。?/td> | 872K |
| 代理商： | PCT789T-A |
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PC-TEL, Inc.
16
1789W0DOCDAT06A-0299
PCT1789W DATA SHEET
P
IN
C
OMPARISON
OF
PCT301L
AND
PCT303W
!
PRELIMINARY
PRELIMINARY
PCT303W Pin Descriptions
P
IN
C
OMPARISON
OF
PCT301L
AND
PCT303W
Table 6 PCT303W Pin Descriptions
Name
Line Interface
FILT
FILT2
RX
DCT
REXT
REXT2
RNG1
Number
I/O Description
15
16
14
2
13
12
5
Filter. Sets the time constant for the DC termination circuit.
Filter 2. Sets the time constant for the DC termination circuit.
Receive input. Serves as the receive side input from the telephone network.
DC termination. Provides DC termination to the telephone network.
External resistor. Sets the real AC termination impedance.
External resistor 2. Sets the complex AC termination impedance.
Ring 1. Connects through a 680pF capacitor to the “Tip” lead of the telephone line. Pro-
vides the ring and caller ID signals to the PCT303DW.
Ring 2. Connects through a 680pF capacitor to the “Ring” lead of the telephone line.
Provides the ring and caller ID signals to the PCT303DW.
Transistor base. Connects to the base of transistor Q3.
Transistor emitter. Connects to the emitter of transistor Q3.
Transistor emitter 2. Connects to the emitter of transistor Q4.
Reference. Connects to an external resistor to provide a high-accuracy reference cur-
rent.
RNG2
6
QB
QE
QE2
REF
7
8
1
11
Isolation
C1B
IGND
4
3
Isolation capacitor 1B. Connects to one side of isolation capacitor C1.
Isolated ground. Connects to ground on the line-side interface. Also connects to capac-
itor C2.
Miscellaneous Signals
VREG
9
Voltage regulator. Connects to an external capacitor to provide bypassing for an inter-
nal power supply.
Voltage regulator 2. Connects to an external capacitor to provide bypassing for an
internal power supply.
VREG2
10
Table 7 PCT301L/PCT303W Pin Comparison
Pin Number
Pin Name
Pin Number
Pin Name
PCT301L
TSTA
TSTB
IGND
C1B
RNG1
RNG2
QB
QE
PCT303W
QE2
DCT
IGND
C1B
RNG1
RNG2
QB
QE
PCT301L
VREG
NC
NC
DCT
REXT
RX
NC
TX
PCT303W
VREG
VREG2
REF
REXT2
REXT
RX
FILT
FILT2
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
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