52
LV4930M (IC3) Pin Function Table (continued)
Pin Pin
name
Description
19
ZobelSense1
Same as pin 15, but for ch 1.
20
Mod_ch1
Pin for connecting the external loop components. This pin is an op-amp output
pin and is connected to the modulation comparator.
21
Pwm-_ch1
The first of two balanced high impedance current comparator output. This output
is connected via level shift transistors to the driver.
22
Pwm+_ch1
The second of the balanced high impedance current comparator output. When
both of these outputs are low (Pwm-_ch1 and Pwm+_ch1) the driver will regard
this as a disable. This is the way the disable is communicated to the driver.
23
In_C_Ch1
Connects the external loop components. Virtual ground summing pin.
24
Out_B_Ch1
Connects the external loop components. Op-amp output pin.
25
In_B_Ch1
Connects the external loop components. Virtual ground summing pin.
26
Out_A_Ch1
Connects the external loop components. Op-amp output pin.
27
In_A_Ch1
Connects the external loop components. Virtual ground summing pin.
28 NC
No
connection
29 Vdd
Positive
supply
pin
30
UVP_en
Enables the Under Voltage Protection by connecting to Vdd and disabling by
connecting to Vss.
31
Main_Gnd
General ground for protection and all miscellaneous circuits.
32 Vss
Negative
supply
33
Ref_ch1
Input reference for channel 2. This pin is a local ground reference for the audio
circuit of this channel. It is not connected internally to main ground.
34
CS1_ch1
Pin for connection of capacitor for the dc servo. This pin is the output of the
internal dc servo amplifier.
35
CS2_ch1
Pin for connection of capacitor for the dc servo. This pin is virtual ground.
36
RECout_ch1
This pin is the ch1 receiver output after an internal series resistor of 1k. By
connecting a capacitor to ground a low pass function is obtained. From this pin
the signal is internally passed on to the output stage.
37
Vin__ch1
High impedance audio input. This input is non-inverting.
38
DC_FB_ch1
DC servo feedback point. This is a low impedance point with a correction voltage
of +/- 100mV range. Connect to input via a resistor of 47kohm.
39
Vin_ch2
High impedance audio input. This input is non-inverting.
40
DC_FB_ch2
DC servo feedback point. This is a low impedance point with a correction voltage
of +/- 100mV range. Connect to input via a resistor of 47kohm.
41
RECout_ch2
This pin is the ch2 receiver output after an internal series resistor of 1k. By
connecting a capacitor to ground a low pass function is obtained. From this pin
the signal is internally passed on to the output stage.
42
CS1_ch2
Pin for connection of capacitor for the dc servo. This pin is the output of the
internal dc servo amplifier.
43
CS2_ch2
Pin for connection of capacitor for the dc servo. This pin is virtual ground.
44
Ref_ch2
Input reference for channel 2. This pin is a local ground reference for the audio
circuit of this channel. It is not connected internally to main ground.
Integrated Circuit Diagrams
