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QS7785 Schematic ( PDF Datasheet ) - Nippon Precision Circuits Inc

Teilenummer QS7785
Beschreibung 3D 2/4-Channel Stereo Surround Synthesizer
Hersteller Nippon Precision Circuits Inc
Logo Nippon Precision Circuits Inc Logo 




Gesamt 15 Seiten
QS7785 Datasheet, Funktion
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






QS7785 Datasheet, Funktion
QS7785PF/CF
AC Characteristics
VCC = 9V, VDD = 5V, GND = 0V, Ta = 25°C
Parameter
Symbol
Condition
Bypass-mode maximum input voltage
Qsurround enhanced-mode
maximum input voltage
Qsurround-mode maximum input
voltage (surround speakers on)
Mono/stereo conversion enhanced
mode maximum input voltage
Mono/stereo conversion mode
maximum input voltage (surround
speakers on)
Bypass gain
Bypass gain (surround speakers on)
Qsurround mode gain
Qsurround mode crosstalk gain
Qsurround mode gain (surround)
Qsurround mode crosstalk gain
(surround)
Qsurround enhanced mode gain
Qsurround enhanced mode crosstalk
gain
Mono/stereo conversion mode left-
channel gain
Mono/stereo conversion mode right-
channel gain
Mono/stereo conversion enhanced
mode left-channel gain
Mono/stereo conversion enhanced
mode right-channel gain
Mono/stereo conversion mode
surround left-channel gain
Mono/stereo conversion mode
surround right-channel gain
SCL clock pulse period
SCL clock HIGH-level pulsewidth
SCL clock LOW-level pulsewidth
SDA setup time
SDA hold time
STRB setup time
STRB pulsewidth
STRB hold time
VB
VQ+
VQS
VM+
VMS
GBYP1
GBYP2
GQ
GQX
GQS
GQXS
GQ+
GQX+
GML
GMR
GML+
GMR+
GMSL
GMSR
t0
t1
t2
t3
t4
t5
t6
t7
BYP = SUR = HIGH, MONO = SP = LOW,
LIN = RIN, f = 1kHz
BYP = MONO = SUR = LOW, SP = HIGH,
LIN = RIN, f = 1kHz
BYP = MONO = SP = LOW, SUR = HIGH,
LIN = RIN, f = 1kHz
BYP = SUR = LOW, MONO = SP = HIGH,
LIN = RIN, f = 1kHz
BYP = SP = LOW, MONO = SUR = HIGH,
LIN = RIN, f = 1kHz
BYP = HIGH, MONO = SUR = SP = LOW,
LIN to FLOUT, RIN to FROUT, f = 1kHz
BYP = SUR = HIGH, MONO = SP = LOW,
LIN to SLOUT, RIN to SROUT, f = 1kHz
BYP = MONO = SUR = SP = LOW, LIN to
FLOUT, RIN to FROUT, f = 1kHz
BYP = MONO = SUR = SP = LOW, LIN to
FROUT, RIN to FLOUT, f = 1kHz
BYP = MONO = SP = LOW, SUR = HIGH,
LIN to SLOUT, RIN to SROUT, f = 1kHz
BYP = MONO = SP = LOW, SUR = HIGH,
LIN to SROUT, RIN to SLOUT, f = 1kHz
BYP = MONO = SUR = LOW, SP = HIGH,
LIN to FLOUT, RIN to FROUT, f = 1kHz
BYP = MONO = SUR = LOW, SP = HIGH,
LIN to FROUT, RIN to FLOUT, f = 1kHz
BYP = SUR = SP = LOW, MONO = HIGH,
LIN = RIN, FLOUT, f = 1kHz
BYP = SUR = SP = LOW, MONO = HIGH,
LIN = RIN, FROUT, f = 1kHz
BYP = SUR = LOW, MONO = SP = HIGH,
LIN = RIN, FLOUT, f = 1kHz
BYP = SUR = LOW, MONO = SP = HIGH,
LIN = RIN, FROUT, f = 1kHz
BYP = SP = LOW, MONO = SUR = HIGH,
LIN = RIN, SLOUT, f = 1kHz
BYP = SP = LOW, MONO = SUR = HIGH,
LIN = RIN, SROUT, f = 1kHz
QS7785PF
QS7785PF
QS7785PF
QS7785PF
QS7785PF
QS7785PF
QS7785PF
QS7785PF
min
1.7
1.8
1.3
0.8
0.8
2
2
3.9
1.5
2.3
1.9
4.7
1.3
2.6
3.6
2.4
3.3
3.8
1.6
100
40
40
15
30
50
100
50
Rating
typ
2.3
2.4
1.7
1.0
1.0
0
0
5.9
0.5
0.3
0.1
6.7
3.3
4.6
5.6
4.4
5.3
1.8
0.4
max
2
2
7.9
2.5
1.7
2.1
8.7
5.3
6.6
7.6
6.4
7.3
0.2
2.4
Unit
VRMS
VRMS
VRMS
VRMS
VRMS
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
ns
ns
ns
ns
ns
ns
ns
ns
NIPPON PRECISION CIRCUITS—6

6 Page









QS7785 pdf, datenblatt
QS7785PF/CF
Bass Boost
With a signal input connected to BASC1 and
BASC2, a bass boost function can be implemented.
When BASS is HIGH, resistors RA and RB and
capacitor C are connected to form a lowpass filter.
The lowpass filter signal and the original signal
(RIN, LIN) are combined to boost bass frequencies.
+
RA=10k
C:0.15µF
RIN
/LIN
37
RB:10k
36
BASC1
/BASC2
R1:20k
R2:20k
To Internal
VREFOUT
Close when BASS=H
Open when BASS=L
Bass boost connection (Gb = 6dB, fC = 300Hz)
.
Gain
Gb
0dB
fL fC fH
( )Gb=20 log
1+
R1
RA+RB
fC=
1+
R1
RA+RB
2πC
RA RB
RA+RB
( )fL=fC
10
1
2
log
1+
R1
RA+RB
1+2
RA+RB
R1
( )Freq.
1
fH=fC 10 2
log
1+
R1
RA+RB
1+2
RA+RB
R1
Bass boost frequency response
NIPPON PRECISION CIRCUITS—12

12 Page





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