Philips Semiconductors
Product specification
Dolby* Pro Logic Surround;
Incredible Sound
FEATURES
•
Two stereo I
2
S-bus digital input channels
•
Three stereo I
2
S-bus digital output channels
•
I
2
C-bus mode control
•
Up to 45 ms on-chip delay-line (f
s
= 44.1 kHz)
•
Optional clock divider for crystal oscillator
•
Package: SO32L
•
Operating supply voltage range: 4.5 to 5.5 V.
Functions
•
4-channel active surround, 20 Hz to 20 kHz
(maximum
1
⁄
2
f
s
)
•
Adaptive matrix
•
7 kHz low-pass filters
•
Adjustable delay for surround channel
•
Modified Dolby B noise reduction
•
Noise sequencer
•
Variable output matrix
•
Sub woofer
•
Centre mode control: on/off, normal, phantom, wide
•
Output volume control
•
Automatic balance and master level control with
DC-offset filter
QUICK REFERENCE DATA
SYMBOL
V
DD
∆V
DD
V
i
I
DD
I
SS
T
amb
T
stg
PARAMETER
DC supply voltage
voltage difference between two V
DDx
pins
maximum input voltage
DC supply current
DC supply current
ambient operating temperature
storage temperature range
MIN.
−0.5
−
−0.5
−
−
−40
−65
SAA7710T
•
Hall/matrix surround sound functions
•
Incredible sound functions
•
5-band parametric equalizer on main channels left,
centre, right (f
s
= 32 kHz)
•
Tone control (bass/treble) on all four output channels
(f
s
= 44.1 kHz).
GENERAL DESCRIPTION
This data sheet describes the 104 ROM-code version of
the SAA7710T chip. The SAA7710T chip is a high quality
audio-performance digital add-on processor for digital
sound systems. It provides all the necessary features for
complete Dolby Pro Logic surround sound on chip.
In addition to the Dolby Pro Logic surround function, this
device also incorporates a 5-band parametric equalizer, a
tone control section and a volume control. Instead of Dolby
Pro Logic surround, the Hall/matrix surround and
Incredible sound functions can be used together with the
equalizer or tone control.
MAX.
+6.5
550
V
DD
+ 0.5
50
50
+85
+150
UNIT
V
mV
V
mA
mA
°C
°C
Remark Dolby*:
Dolby’ and ‘Pro Logic’ are trademarks of Dolby Laboratories Licensing Corporation. They are available
only to licensees of Dolby Laboratories Licensing Corporation, San Francisco, CA94111, USA, from whom licensing and
application information must be obtained.
ORDERING INFORMATION
TYPE NUMBER
SAA7710T/N104
PACKAGE
NAME
SO32
DESCRIPTION
plastic small outline package; 32 leads; body width 7.5 mm
VERSION
SOT287-1
1998 Mar 13
2
Philips Semiconductors
Product specification
Dolby* Pro Logic Surround;
Incredible Sound
PINNING
SYMBOL
I
2
S_WSOUT
I
2
S_BCKOUT
RTCB
SHTCB
V
DD1
V
SS1
DSP_IN1
DSP_IN2
DSP_OUT1
DSP_OUT2
V
SS2
V
DD2
TSCAN
A0
SDA
SCL
DSP_RESET
V
SS_XTAL
V
DD_XTAL
XTAL
OSC
I
2
S_BCKIN1
I
2
S_WSIN1
I
2
S_DATAIN1
I
2
S_DATAIN2
I
2
S_WSIN2
I
2
S_BCKIN2
I
2
S_DATAOUT1
I
2
S_DATAOUT2
I
2
S_DATAOUT3
V
SS3
V
DD3
PIN
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
DESCRIPTION
I
2
S-bus slave word-select
output
I
2
S-bus slave bit-clock output
asynchronous reset test control
block input (active LOW)
clock divider switch enable
input (LOW = divide)
positive power supply
ground power supply
flag input 1
flag input 2
flag output 1
flag output 2
ground power supply
positive power supply
scan control input
slave address
selection input
I
2
C-bus serial data input/output
I
2
C-bus serial clock input
chip reset input (active LOW)
ground power supply crystal
oscillator
positive power supply crystal
oscillator
crystal oscillator output
crystal oscillator input
I
2
S-bus master bit-clock input 1
I
2
S-bus master word-select
input 1
I
2
S-bus master data input 1
I
2
S-bus master data input 2
I
2
S-bus master word-select
input 2
I
2
S-bus master bit-clock input 2
I
2
S-bus slave data output 1
I
2
S-bus slave data output 2
I
2
S-bus slave data output 3
ground power supply
positive power supply
I
2
C-bus
handbook, halfpage
I
2
S_WSOUT
SAA7710T
1
2
3
4
5
6
7
8
32 VDD3
31 VSS3
30 I
2
S_DATAOUT3
29 I
2
S_DATAOUT2
28 I
2
S_DATAOUT1
27 I
2
S_BCKIN2
26 I
2
S_WSIN2
25 I
2
S_DATAIN2
I
2
S_BCKOUT
RTCB
SHTCB
VDD1
VSS1
DSP_IN1
DSP_IN2
DSP_OUT1
SAA7710T
9
DSP_OUT2 10
VSS2 11
VDD2 12
TSCAN 13
A0 14
SDA 15
SCL 16
MGE750
24 I
2
S_DATAIN1
23 I
2
S_WSIN1
22 I
2
S_BCKIN1
21 OSC
20 XTAL
19 VDD_XTAL
18 VSS_XTAL
17 DSP_RESET
Fig.2 Pin configuration.
1998 Mar 13
4
Philips Semiconductors
Product specification
Dolby* Pro Logic Surround;
Incredible Sound
FUNCTIONAL DESCRIPTION
Figure 1 shows the block diagram of the SAA7710T.
The SAA7710T consists of a Dolby Pro Logic decoder
together with equalizer or tone control. The Dolby Pro
Logic part of the IC may be used to decode audio
soundtracks (Dolby surround movies or Dolby surround
video productions) from for example, a video recorder
(VCR) or a CD laser disc into four channels Left, Centre,
Right and Surround (L, C, R and S).
If desired, post-processing with either an equalizer or a
tone control section is possible. In addition to this, a Sub
Woofer (SW) channel, digital volume control and a
user-programmable variable output matrix are
implemented.
Hall/matrix surround sound functions are implemented for
material not encoded using Dolby Surround. These
features can be used as an alternative to Dolby Pro Logic
and can also be combined with the equalizer or tone
control sections.
Incredible sound is a Philips patented technology which
substantially improves the stereo effect of a television or
audio system. Using advanced signal processing,
speakers that are positioned close together can imitate the
sound produced by speakers that are far apart.
Functional modes
The device thus supports three main modes, Dolby Pro
Logic/Dolby 3 stereo or hall/matrix surround or Incredible
sound mode. All modes can be combined with equalizing
(3-band or 5-band) or tone control depending on f
s
and
available cycle budget.
T
HE
D
OLBY
P
RO
L
OGIC MODE
In Dolby Pro Logic mode, several blocks must be initialized
and controlled during operation:
•
Noise generator and noise sequencer
•
Centre channel mode
(1)
(normal, phantom, wide, off)
•
Combining network coefficients
•
7 kHz low-pass filter in surround
•
Surround channel delay time
(1)
•
Modified Dolby B noise reduction must be on.
Possible post-processing modes for Dolby Pro Logic are:
•
Volume control only
(1) The coefficient set used to initialize and control the operation
of the Dolby Pro Logic mode depends upon the selected
sampling frequency f
s
= 32, 44.1 or 48 kHz.
SAA7710T
•
Equalizer (3- or 5-band on L, C and R) or tone control
(L, C, R and S); fixed output matrix
(1)
; volume control
•
Equalizer (5-band on L, C and R); variable output
matrix
(1)
; volume control
•
Extra sub woofer
(1)
.
T
HE
D
OLBY
3
STEREO MODE
In Dolby 3 stereo mode, several blocks must be initialized
and controlled during operation:
•
Noise generator and noise sequencer
•
Centre channel mode
(1)
(normal, phantom, wide and off)
•
Combining network coefficients
•
Incredible Sound widening of the stereo base on two
speakers
•
Effect is user adjustable.
T
HE HALL
/
MATRIX SURROUND MODE
In hall/matrix surround mode, the blocks listed below must
be initialized and controlled during operation:
•
Input balance control
•
Hall or matrix surround Mode setting
•
All-pass and filter transfer characteristics
(1)
•
7 kHz low-pass filter in surround channel
(1)
•
Surround channel delay
(1)
.
Possible post-processing modes for hall/matrix surround
are as above:
•
Volume control only
•
Equalizer (5-band on L, C and R) or tone control
(L, C, R and S); fixed output matrix
(1)
; volume control
•
Equalizer (5-band on L,C,R); variable output matrix
(1)
;
volume control
•
Extra sub woofer
(1)
.
T
HE INCREDIBLE SOUND MODE
In the Incredible sound mode the blocks listed below must
be initialized and controlled during operation:
•
Incredible sound coefficients
•
Combining network coefficients.
Possible post-processing modes for incredible sound are
as follows:
•
Volume control only
•
Equalizer (5-band on L and R) or tone control (L and R);
variable output matrix
(1)
, volume control
•
Extra sub-woofer
(1)
.
5
channel
(1)
1998 Mar 13
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