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參數(shù)資料
| 型號(hào)： | HC5549IM |
| 廠商： | HARRIS SEMICONDUCTOR |
| 元件分類： | 模擬傳輸電路 |
| 英文描述： | THERMISTOR PTC1KOHM 70 DEG 0805 |
| 中文描述： | TELECOM-SLIC, PQCC28 |
| 文件頁(yè)數(shù)： | 13/13頁(yè) |
| 文件大?。?/td> | 87K |
| 代理商： | HC5549IM |
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4-92
Pin Description
PLCC
SYMBOL
DESCRIPTION
1
TIP
TIP power amplifier output.
2
BGND
Battery Ground - To be connected to zero potential. All loop current and longitudinal current flow from this ground.
Internally separate from AGND but it is recommended that it is connected to the same potential as AGND.
3
VBL
Low battery supply connection.
4
VBH
High battery supply connection.
5
SW+
Uncommitted switch positive terminal.
6
SW-
Uncommitted switch negative terminal.
7
SWC
Switch control input. This TTL compatible input controls the uncommitted switch, with a logic “0” enabling the switch and
logic “1” disabling the switch.
8
F2
Mode control input - MSB. F2-F0 for the TTL compatible parallel control interface for controlling the various modes of
operation of the device.
9
F1
Mode control input.
10
F0
Mode control input.
11
E0
Detector Output Selection Input. This TTL input controls the multiplexing of the SHD (E0=1) and GKD (E0 =0) comparator
outputs to the DET output based upon the state at the F2-F0 pins.
12
DET
Detector Output - This TTL output provides hook status of the loop based upon the selected operating mode. The
detected output will either be switch hook, ground key or ring trip.
13
ALM
Thermal Shutdown Alarm. This pin signals the internal die temperature has exceeded safe operating temperature and
the device has been powered down automatically.
14
AGND
Analog ground reference. This pin should be externally connected to BGND.
15
BSEL
Selects between high and low battery, with a logic “1” selecting the high battery and logic “0” the low battery.
16
NC
This pin is a “no connect” and should remain floating proper device operation.
17
POL
Capacitor connected to this pin sets the polarity reversal slew rate.
18
VRB
Ringing Bias Input - Analog input to offset Tip output towards ground while in Ringing Mode.
19
VRX
Analog Receive Voltage - 4-wire analog audio input voltage. AC couples to codec.
20
VTX
Transmit output voltage - Output of impedance matching amplifier, AC couples to codec.
21
VFB
Feedback voltage for impedance matching. This voltage is scaled to accomplish impedance matching.
22
-IN
Impedance matching amplifier summing node.
23
VCC
Positive voltage power supply.
24
CDC
DC Biasing Filter Capacitor - Connects between this pin and VCC.
25
RTD
Ring trip filter network.
26
ILIM
Loop Current Limit programming resistor.
27
RD
Switch hook detection threshold programming resistor.
28
RING
RING power amplifier output.
HC5549
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