QS7785 Datasheet PDF - Nippon Precision Circuits Inc
| Part Number | QS7785 | |
| Description | 3D 2/4-Channel Stereo Surround Synthesizer | |
| Manufacturers | Nippon Precision Circuits Inc | |
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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
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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
kΩ
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
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Part DetailsOn this page, you can learn information such as the schematic, equivalent, pinout, replacement, circuit, and manual for QS7785 electronic component. |
| Information | Total 15 Pages | |
| Link URL | [ Copy URL to Clipboard ] | |
| Download | [ QS7785.PDF Datasheet ] | |
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Featured Datasheets
| Part Number | Description | MFRS |
| QS7785 | The function is 3D 2/4-Channel Stereo Surround Synthesizer. Nippon Precision Circuits Inc | |
| QS7785CF | The function is 3D 2/4-Channel Stereo Surround Synthesizer. Nippon Precision Circuits Inc | |
| QS7785PF | The function is 3D 2/4-Channel Stereo Surround Synthesizer. Nippon Precision Circuits Inc | |
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