LV1110NM Datasheet, PDF (16/22 Pages) Sanyo Semicon Device – Digital Surround Processor IC

LV1110NM
Graphic equalizer level attenuation technique
Pins 8 and 9
• Since the graphic equalizer provides a maximum boost of 10 dB, the head room is insufficient when this boost is used.
Therefore, the signal level must be attenuated in the graphic equalizer block. One technique for providing this
attenuation is to connect resistors in series with the external capacitors connected at pins 8 and 9 in the DC cut circuit.
The formula below can be used to determine the amount of attenuation due to the value of the resistor.
Attenuation: V_G = 20 × log (1 – R/10 K + R) dB
Example: If R = 10 kΩ, the attenuation will be –6 dB.
Pin Functions
Pin No.
1
54
55
56
57
58
61
62
63
64
Pin Name
EXT.R.IN
CD.L.IN
TAPE.L.IN
TUNER.L.IN
MD.L.IN
EXT.L.IN
CD.R.IN
TAPE.R.IN
TUNER.R.IN
MD.R.IN
Pin voltage
Equivalent circuit
1/2 V_CC
• Function input pins. A TAPE, TUNER, or EXT inputs
passes through an internal 6-dB amplifier; a CD or MD
input, through a buffer amplifier.
Description
2
REC.R.OUT1
3
REC.R.OUT2
1/2 V_CC • Recording output pins.
52
REC.L.OUT1
53
REC.L.OUT2
4
MIC.IN
1/2 V_CC • Microphone mixer and echo input pin.
Continued on next page.
No. 6094-16/22