Le77D11
Data Sheet
PIN DESCRIPTIONS
Pin Name
Type
Description
Analog and digital ground return for VCC circuitry (common to both
channels).
AGND
Ground
A
1,2 (Tip)
Output
Ground
Output
Input
A (Tip) lead power amplifier outputs for channels 1 and 2.
Supply ground return for power amplifiers on channel 1 and 2.
B (Ring) lead power amplifier outputs for channels 1 and 2.
Logic control inputs to control channel 1 state.
BGND1,2
B1,2 (Ring)
C11, C21, C31
C12, C22, C32
CFILT1,2
Input
Logic control inputs to control channel 2 state.
Output
AC coupling pins for 4-wire (VOUT) amplifiers of channels 1 and 2.
Switching power supply clock input that sets the frequency and
maximum duty cycle of the switcher (common to both channels).
CHCLK
CHS1,2
Input
Input
Compensation nodes for switching power supply channels 1 and 2.
Fault detect pins for channels 1 and 2. A low indicates a fault for the
respective channel, which can be triggered by large longitudinal
current, or ground key.
F1,2
Output
FSET
Input
Ramp rate control pin for 85.3 kHz operation.
Current output equal to the loop current divided by 500. During
thermal overload, IMT is forced High.
IMT1,2
Output
Voltage sense pins to limit peak current in external switching power
supply transistors (channels 1 and 2).
A capacitor tied from these pins to AGND stabilizes the DC feed
loop, and lowers Idle Channel Noise for channels 1 and 2.
An optional capacitor tied from these pins to AGND controls the
reverse polarity slew rate of channels 1 and 2.
ILS1,2
Input
Output
Output
LPF1,2
NPRFILT1,2
Resistor connection to programmable VDCi pin of Le78D11
VoSLAC device to set DC feed current limit threshold (ILTH) of each
channel.
RDC1,2
Input
Base (gate) drive for switching power supply transistor (channels 1
and 2).
A nominal 3.3 V power supply for internal VCC circuitry (common
to both channels).
SD1,2
VCC
Output
Supply
High pass inverting summing nodes of the VOUT amplifiers driven
by the AC current coming from CFILT1 and CFILT2.
VHP1,2
Output
Output
VOUT1,2
Analog (4-wire side) VOUT amplifier output.
Analog (4-wire side) voice or ringing signal inputs. These pins
multiplex between 4-wire voice input and ringing input depending
on the programmed state of the Le77D11 VoSLIC device channel.
VIN1,2
Input
A nominal 1.4 V reference supplied by the Le78D11 VoSLAC
device for internal use (common to both channels).
Negative regulated power supplies generated by the Le77D11
VoSLIC device Switching Regulators. (Channels 1 and 2).
VREF
Supply
Supply
VREG1,2
A positive supply used to generate the negative supplies of VREG1
VREG2 (common to both channels).
,
VSW
Supply
Exposed pad on underside of device must be connected to a heat
spreading area. The AGND plane is recommended.
Exposed Pad
Isolated
11
Zarlink Semiconductor Inc.
ZARLINK [ ZARLINK SEMICONDUCTOR INC ]
