QS7779PM/CM
NIPPON PRECISION CIRCUITS--1
NIPPON PRECISION CIRCUITS INC.
3D Stereo Enhancement and 3D Virtual Stereo Surround
with Dolby Pro Logic and Mixed DVD (AC-3) Decoder
OVERVIEW
The QS7779PM/CM is an audio processor IC which
implements a decoder for stereo matrix encoded
source materials such as the Dolby Surround Pro
Logic and mixed DVD (AC
-
3) with surround virtu-
alization using QSound
TM
technology developed and
licensed by QSound Labs, Inc. This chip produces
enhanced stereo sound for a stereo input signal and if
the input signal contains matrix encoded surround
sound, the chip decodes it and produces 3D virtual-
ized surround sounds with two speakers.
FEATURES
s
Capable of decoding Dolby Surround materials
such as Dolby Pro Logic or other matrix surround
encoded materials (DVD/AC
-
3)
s
Virtualized surround sound with two speakers
s
3D stereo sound enhancement
s
Two enhanced levels
s
Parallel and serial digital interface for mode con-
trol
QS7779CM for I
2
C 2 control pins serial inter-
face (Data, Clock)
QS7779PM for three-wire serial interface
(Data, Clock and Strobe)
s
Supply voltage (analog): 5 to 13V
Supply voltage (digital): 4.5 to 5.5V
s
24-pin SSOP packaging
APPLICATIONS
s
DVD, Laser disk player
s
Audio systems including TV, Radio and VCR
s
Computer-based multimedia products, including
sound cards and powered loudspeakers
PINOUT
(Top view)
QS7779PM
QS7779CM
Using these products does not require any Dolby certifications.
ORDERING INFORMATION
I
2
C bus is a registered tra d e m a r k of Philips Electronics N.V.
Dolby and the double-D symbol are registered tra d e m a r ks of Dolby Laboratories Licensing Corporation.
1
13
24
12
QXAC3
QXAC2
QXAC1
RIN
LIN
COUT
CIN
QXAC4
VCC
QXBC1
QXBC2
QXBC3
QXBC4
ROUT
VREFIN
LOUT
VREFOUT
VREF
GND
SPRD(SCL)
MUTE(STRB)
VDD
P/S
BYP(SDA)
QS7779PM
1
13
24
12
QXAC3
QXAC2
QXAC1
RIN
LIN
COUT
CIN
QXAC4
VCC
QXBC1
QXBC2
QXBC3
QXBC4
ROUT
VREFIN
LOUT
VREFOUT
VREF
GND
SPRD(SCL)
MUTE
VDD
P/S
BYP(SDA)
QS7779CM
D e vice
P a ck ag e
Q S 7 7 7 9 P M
24-pin SSOP
Q S 7 7 7 9 C M
24-pin SSOP
Q S 7 7 7 9 P M / C M
NIPPON PRECISION CIRCUITS--2
PACKAGE DIMENSIONS
(Unit: mm)
BLOCK DIAGRAM
0.36 0.10
10.20 0.30
10.05 0.20
0.10 0.10
1.80
7.80 0.30
5.40 0.20
0 10
0.50 0.20
1.90
-
0.10
+0.20
0.15
+
0.10
-
0.05
0.8
0.10
0.12
M
LIN
RIN
VCC
ROUT
Serial I/O
QXpander
P/S
MUTE
(STRB)
BYP
(SDA)
SPRD
(SCL)
QXAC1 QXAC2 QXAC3 QXAC4 QXBC1 QXBC2 QXBC3 QXBC4
Q1
Virtualization
Surround
Decoder
LOUT
Multiplex/Level Shift
CIN
COUT
VDD
VREFIN
GND
VREFOUT VREF
1
2
3
24
22
21
20
19
5
23
11
8
4
9
10
12
13
16
18
14
15
17
6
7
Q S 7 7 7 9 P M / C M
NIPPON PRECISION CIRCUITS--3
PIN DESCRIPTION
N u m b e r
N a m e
I/O
Description
P arallel
Serial
1
Q X A C 3
I
Capacitor 3 fo r Q E X PA N D E R fi lter A
2
Q X A C 2
I
Capacitor 2 fo r Q E X PA N D E R fi lter A
3
Q X A C 1
I
Capacitor 1 fo r Q E X PA N D E R fi lter A
4
R I N
I
Right channel signal input
5
LIN
I
Left channel signal input
6
C O U T
O
Decoded center signal output
7
C I N
I
Center signal input for summing with the right and the left signal outputs
8
V R E F I N
O
Internally generated reference voltage (V
C C
/2)
9
V R E F O U T
O
Buffered reference voltage (V
C C
/2)
1 0
V R E F
I
Signal reference input
1 1
G N D
G r o u n d 0 V
1 2
S P R D
I
Enhancement control (H: spread maximum, L: spread minimu m )
S C L
1
1. Q S 7 7 7 9 C M :CMOS input. No protective diode between the terminal and V D D.
Q S 7 7 7 9 P M :CMOS input. Protective diode is in between the terminal and V D D.
I
Ser ial data shift clock
1 3
B Y P
I
Bypass control (H: Bypass on, L: Qsurround on)
S D A
2
2. Q S 7 7 7 9 C M :Nch open drain terminal. No protective diode between terminal and V D D.
Q S 7 7 7 9 P M :CMOS input. Protective diode is in between the terminal and V D D.
I/O
Ser ial data input. ACK data output for I
2
C (Q S 7 7 7 9 C M )
1 4
P / S
I
Interface mode control (H: parallel I/O, L: serial I/O)
1 5
V D D
Digital pow er supply DC4.5 to 5.5V
1 6
M U T E
I
Output mute control (H: mute on, L: mute off)
S T R B
I
Ser ial data strobe (not applicable to I
2
C of Q S 7 7 7 9 C M )
1 7
L O U T
O
Left signal output
1 8
R O U T
O
Right signal output
1 9
Q X B C 4
I
Capacitor 4 fo r Q E X PA N D E R fi lter B
2 0
Q X B C 3
I
Capacitor 3 fo r Q E X PA N D E R fi lter B
2 1
Q X B C 2
I
Capacitor 2 fo r Q E X PA N D E R fi lter B
2 2
Q X B C 1
I
Capacitor 1 fo r Q E X PA N D E R fi lter B
2 3
V C C
Analog pow er supply DC5 to 13V
2 4
Q X A C 4
I
Capacitor 4 fo r Q E X PA N D E R fi lter A
Q S 7 7 7 9 P M / C M
NIPPON PRECISION CIRCUITS--4
SPECIFICATIONS
Absolute Maximum Ratings
GND = 0V
Recommended Operating Conditions
GND = 0V
P arameter
S y m b o l
Rating
Unit
Supply voltage (analog)
V
C C
0.3 to 15
V
Supply voltage (digital)
V
D D
0.3 to 7
V
Input voltage (analog)
V
I A N A
0.3 to V
C C
+ 0.3
V
Input voltage (digital)
V
IDIG
0.3 to V
D D
+ 0.3
V
I
2
C input voltage (SDA, SCL)
V
I O P E N
1 0
V
P ow er dissipation
P
D
2 5 0
m W
Storage temperature
T
stg
40 to 125
C
Soldering temperature
T
S L D
2 5 5
C
Soldering time
t
S L D
1 0
sec
P arameter
S y m b o l
Limits
Unit
Supply voltage (analog)
V
C C
5 to 13
V
Supply voltage (digital)
V
D D
4.5 to 5.5
V
O p e rating temperature
T
O P R
20 to 70
C
Q S 7 7 7 9 P M / C M
NIPPON PRECISION CIRCUITS--5
DC Electrical Characteristics
V
CC
= 9V, V
DD
= 5V, GND = 0V, Ta = 25
C unless otherwise noted.
Noise/THD Characteristics
V
CC
= 9V, V
DD
= 5V, GND = 0V, Ta = 25
C unless otherwise noted.
Parameter
S y m b o l
Condition
Limits
Unit
m i n
typ
m a x
LIN, RIN analog input impedance
Z
A I N 1
1 6
2 0
2 4
k
CIN analog input impedance
Z
A I N 2
4
5
6
k
Reference voltage out
V
R E F O U T
V
C C
/2
V
HIGH-level input voltage
V
IH
0.7
V
D D
V
L O W -level input voltage
V
IL
0.3
V
D D
V
Input leakage current
I
L E A K
3
3
A
S D A, SCL input leakage current
(I
2
C input pin)
I
L O P E N
V
IN
= 10V
3
3
A
S D A L OW -level output voltage
V
O L
A c k n owledge signal out
I
O L
= 3mA
0
0.4
V
Supply voltage (analog)
V
C C
5
1 3
V
Supply voltage (digital)
V
D D
4.5
5.5
V
Current consumption (analog)
I
C C
5
6.5
m A
Current consumption (digital)
I
D D
0.3
0.5
m A
Standby current (analog)
I
C C S A V E
0.1
0.2
m A
Parameter
S y m b o l
Condition
Limits
Unit
m i n
typ
m a x
Noise voltage
N
B Y P
BYP = HIGH (Bypass mode), A-wgt,
L O U T, RO U T
1 0
2 0
V
R M S
Noise voltage
N
Q S
B Y P = L OW (Qsurround mode),
SPRD = HIGH, A-wgt, LOUT, RO U T
2 0
4 0
V
R M S
T H D
T H D
Q S
LIN = RIN = 1V
R M S
, BYP = LOW (Qsur-
round mode), SPRD = HIGH, f = 1kHz
0.1
%
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