
17
FN4924.2
November 3, 2004
Pin Descriptions
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 and SGND but should be connected to the same potential as AGND & SGND.
3VBL
Low Battery Supply Connection.
4VBH
High Battery Supply Connection.
5
BSEL
Selects between high and low battery, with a logic “1” selecting the high battery and logic “0” the low battery.
6
F2
TTL Mode Control Input - MSB.
7
F1
TTL Mode Control Input.
8
F0
TTL Mode Control Input - LSB.
9
DET
Detector Output - This TTL output provides on-hook/off-hook status of the loop based upon the selected operating mode.
The detected output will either be switch hook or ring trip.
10
VRSP
Non-Inverting Ringing Signal Input - Analog input for driving 2-wire interface while in Ring Mode.
11
VRSM
Inverting Ringing Signal Input - Analog input for driving 2-wire interface while in Ring Mode.
12
VTXP
Transmit Output Voltage - AC couples to CODEC.
13
VTXM
Transmit Output Voltage - AC couples to CODEC.
14
AGND
Analog Ground Reference. This pin should be externally connected to BGND.
15
POL
An External Capacitor on this pin sets the polarity reversal time.
16
VRXP
Non-Inverting Analog Receive Voltage - 4-wire analog audio input voltage.
17
VRXM
Inverting Analog Receive Voltage - 4-wire analog audio input voltage.
18
VZO
Connection Terminal for impedance matching programming resistor
19
-IN
Connection Terminal for high pass filter capacitor and impedance matching components.
20
VFB
Connection Terminal for high pass filter capacitor and impedance matching components.
21
TL
Transient Current Limit Programming Resistor Connection Terminal.
22
VCC
Positive Voltage Power Supply, +5V +/-5%.
23
CDCP
DC Biasing Filter Capacitor - Positive Terminal.
24
CDCM
DC Biasing Filter Capacitor - Negative Terminal.
25
RTD
Ring Trip Filter Network Connection Terminal.
26
ILIM
Loop Current Limit programming resistor connection terminal.
27
RD
Switch Hook Detection threshold programming resistor connection terminal.
28
RING
RING Power Amplifier Output.
ISL5586