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PDF QS7785CF Data sheet ( Hoja de datos )

Número de pieza QS7785CF
Descripción 3D 2/4-Channel Stereo Surround Synthesizer
Fabricantes Nippon Precision Circuits Inc 
Logotipo Nippon Precision Circuits Inc Logotipo



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No Preview Available ! QS7785CF Hoja de datos, Descripción, Manual

NIPPON PRECISION CIRCUITS INC.
QS7785PF/CF
3D 2/4-Channel Stereo Surround Synthesizer
OVERVIEW
The QS7785PF/CF is an audio processor IC that
generates 2, 4, 5-channel stereo surround signals
from 2-channel stereo or mono sources using QSur-
round™ technology developed and licensed by
QSound Labs, Inc.
FEATURES
I Surround signal output for 2-channel front speak-
ers
I Surround signal output for 4-channel front + sur-
round speakers
I Center speaker output for voice signals
I Parallel and 2 serial interfaces for mode control
supported
APPLICATIONS
I TV, radio and VCRs
I Car audio
PINOUT (Top view)
QS7785PF
It can create 2-channel left and right surround effect
signal for front speakers, and a rich enhanced sur-
round signal using front speakers and surround
speakers for 4-channel output. It also features a cen-
ter signal output for clear listening of vocal and
speech signals.
• QS7785CF: I2C bus 2-wire serial interface
(Data and Clock)
• QS7785PF: 3-wire serial interface (Data, Clock
and Strobe)
I 5 to 13V analog supply
I 4.5 to 5.5V digital supply
I 48-pin QFP package
I Multimedia products
QS7785CF
RIN 37
LIN 38
BASC2 39
MSC6 40
MSC5 41
MSC4 42
MSC3 43
MSC2 44
MSC1 45
QXCC1 46
QXCC2 47
QXCC3 48
QS7785PF
24 SROUT
23 SLOUT
22 COUT
21 CIN
20 LPC
19 VREFIN
18 N.C.
17 VREFOUT
16 PSAVE
15 MUTE
14 BASS
13 SUR(SCL)
RIN 37
LIN 38
BASC2 39
MSC6 40
MSC5 41
MSC4 42
MSC3 43
MSC2 44
MSC1 45
QXCC1 46
QXCC2 47
QXCC3 48
QS7785CF
24 SROUT
23 SLOUT
22 COUT
21 CIN
20 LPC
19 VREFIN
18 N.C.
17 VREFOUT
16 PSAVE
15 MUTE
14 BASS
13 SUR(SCL)
ORDERING INFORMATION
Device
QS7785PF
QS7785CF
Package
48-pin QFP
48-pin QFP
I2C bus is a registered trademark of Philips Electronics N.V.
Dolby and the double-D symbol are registered trademarks of Dolby Laboratories Licensing Corporation.
NIPPON PRECISION CIRCUITS—1

1 page




QS7785CF pdf
QS7785PF/CF
DC Characteristics
VCC = 9V, VDD = 5V, GND = 0V, Ta = 25°C
Parameter
Analog input impedance
Reference voltage output
HIGH-level input voltage
LOW-level input voltage
Input leakage current
LOW-level output voltage
Supply voltage (analog)
Supply voltage (digital)
Current consumption (analog)
Current consumption (digital)
Standby current (analog)
Symbol
Condition
ZAIN1
ZAIN2
VREFOUT
VIH
VIL
ILEAK
IILOPD
VOL
VCC
VDD
ICC
IDD
ICCSAVE
LIN, RIN
CIN
Digital inputs, VDD input voltage
SDA, SCL, 10V input voltage
ACK signal output from SDA, 3mA sink
current
min
16
8
0.7VDD
3
3
0
5
4.5
Rating
typ
20
10
VCC/2
6
0.3
0.1
max
24
12
0.3VDD
3
3
0.4
13
5.5
8
0.5
0.2
Unit
k
V
V
V
µA
V
V
V
mA
mA
mA
Noise and THD Characteristics
VCC = 9V, VDD = 5V, GND = 0V, Ta = 25°C
Parameter
Symbol
Condition
Rating
min typ max
Unit
Bypass noise voltage
NBYP
BYP = HIGH, SUR = MONO = SP = LOW,
“A”-wgt, FLOUT, FROUT
10 20 µVRMS
Qsurround noise voltage (front)
NQSF
SUR = SP = HIGH, BYP = MONO = LOW,
“A”-wgt, FLOUT, FROUT
20 40 µVRMS
Qsurround noise voltage (surround)
NQSR
SUR = SP = HIGH, BYP = MONO = LOW,
“A”-wgt, SLOUT, SROUT
15 30 µVRMS
Bypass total harmonic distortion
THDB
BYP = SUR = HIGH, MONO = SP = LOW,
LIN = RIN = 1VRMS, f = 1kHz, FLOUT,
FROUT, SLOUT, SROUT
– 0.1 %
Qsurround mono total harmonic
distortion
THDQM
BYP = LOW, SUR = MONO = SP = HIGH,
LIN = RIN = 1VRMS, f = 1kHz, FLOUT,
FROUT, SLOUT, SROUT
– 0.1 %
NIPPON PRECISION CIRCUITS—5

5 Page





QS7785CF arduino
QS7785PF/CF
Center Control
The center signal output on COUT is enabled when
AC is HIGH.
This section describes the output function whereby
fixed frequency sound sources, such as vocal and
speech signals, can be output on the center signal. As
mentioned for “Type C” and “Type D” speaker
arrangements, the center signal can be output by
direct connection to a speaker or by adding the signal
to the front-channel output using a resistor connec-
tion between CIN and COUT.
Using a center speaker
When using a speaker, a capacitor Ca can be con-
nected between LPC and COUT, forming a lowpass
filter. The 3dB cutoff frequency of the filter is given
by the following equation.
f = 2----π----C----a-1---×-----R----1--
Adding to the front-channel output
With this connection, the bass frequency components
can be removed from a signal. Capacitors Ca and Cb
and resistor Ra can be connected between CIN and
COUT to form a highpass filter. The 3dB cutoff fre-
quency of the filter is given by the following equa-
tion.
f = 2----π----C----b---(---R-1---a----+-----R----2----)
The input signal on CIN is added equally to both
front-channel outputs FLOUT and FROUT. Frequen-
cies lower than voice tones are cut from the signal
added to the front-channel outputs for clear repro-
duction of voice-band signals.
Frequencies higher than voice tones are cut from the
signal sent to the center speaker for clear reproduc-
tion of voice-band signals.
Close when AC=H
Open when AC=L
R1:20k
LPC
20
Ca
22
COUT
Close when MUTE=H
Open when MUTE=L
R3:10k
Ra:10k CIN
21
R2:10k
10k
10k
VREFOUT
FROUT
26
10k
10k
FLOUT
25
Front Right
Speaker
Cnter
Speaker
Front Left
Speaker
Center output connection
Gain V(COUT)/V(RIN)@V(LIN)=0
6dB
GC
3dB
3dB
fL=
1
2πCb(Ra+R2)
fH=
1
2πCaR1
( )GC=20 log
R3
Ra+R2
6dB
V(FROUT)
or V(FLOUT)
Freq.
fL fH
Center output frequency response
Note: Internal resistance value, R1 and R2, may vary ± 15%.
NIPPON PRECISION CIRCUITS—11

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