TA8776N
TOSHIBA BIPOLAR LINEAR INTEGRATED CIRCUIT SILICON MONOLITHIC
TA8776N
SURROUND PROCESSOR FOR A CTV
TA8776N is a surround processor controlled I
2
C bus. It
incorporates following functions on a 30pin dual-in-line
shrink-type plastic package.
FEATURES
Surround circuit
l
Sumilated Surround
l
Hall Ambience
l
Dolby Surround (Input
Terminal)
l
3D Center Output (L + R) for
a super woofer.
l
Surround Output (L
−
R)
2
Sound processor circuit
l
Input Switch
l
Volume Adj.
l
Balance Adj
l
Surround Level Adj
l
Bass Adj.
l
Treble Adj.
Weight: 1.99g (Typ.)
I C interface
l
Filter Adj. by Bus line
l
DAC Output (2ch)
BLOCK DIAGRAM
000707EBA2
·
TOSHIBA is continually working to improve the quality and reliability of its products. Nevertheless, semiconductor devices in general
can malfunction or fail due to their inherent electrical sensitivity and vulnerability to physical stress. It is the responsibility of the
buyer, when utilizing TOSHIBA products, to comply with the standards of safety in making a safe design for the entire system, and
to avoid situations in which a malfunction or failure of such TOSHIBA products could cause loss of human life, bodily injury or
damage to property.
In developing your designs, please ensure that TOSHIBA products are used within specified operating ranges as set forth in the
most recent TOSHIBA products specifications. Also, please keep in mind the precautions and conditions set forth in the “Handling
Guide for Semiconductor Devices,” or “TOSHIBA Semiconductor Reliability Handbook” etc..
2001-01-15
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TA8776N
TERMINAL FUNCTION
PIN
No.
NAME
FUNCTION
INTERFACE CIRCUIT
1
2
3
4
φ4
φ3
φ2
φ1
Terminals for capacitors of the phase shifter
blocks. Value of phase shift in each block is
φ
[deg.] =
−2tan
−1
(2πfCR)
C is capacitance of external capacitor. R is
resistance of internal register (10kΩ (Typ.)).
5
6
7
Dolby In
L In
R In
Input terminals. "L In" is for L-ch signal. "R In"
is for R-ch signal. "Dolby In" is for decoded
Dolby Signal.
Terminal for tone control block.
8
Filter Adj.
Cross-over frequency is set by sink current of
this terminal. If 390kΩ connect, cross-over
frequency is about 1kHz.
9
10
TP (R)
TP (L)
Terminals for capacitors for offset cancel
circuits.
11
18
Bass Filter
Treble Filter
Terminals for tone control block.
Control current is smoothed by external
capacitors.
000707EBA2
·
The TOSHIBA products listed in this document are intended for usage in general electronics applications (computer, personal
equipment, office equipment, measuring equipment, industrial robotics, domestic appliances, etc.). These TOSHIBA products are
neither intended nor warranted for usage in equipment that requires extraordinarily high quality and/or reliability or a malfunction or
failure of which may cause loss of human life or bodily injury (“Unintended Usage”). Unintended Usage include atomic energy
control instruments, airplane or spaceship instruments, transportation instruments, traffic signal instruments, combustion control
instruments, medical instruments, all types of safety devices, etc.. Unintended Usage of TOSHIBA products listed in this document
shall be made at the customer’s own risk.
·
The products described in this document are subject to the foreign exchange and foreign trade laws.
·
The information contained herein is presented only as a guide for the applications of our products. No responsibility is assumed by
TOSHIBA CORPORATION for any infringements of intellectual property or other rights of the third parties which may result from its
use. No license is granted by implication or otherwise under any intellectual property or other rights of TOSHIBA CORPORATION or
others.
·
The information contained herein is subject to change without notice.
2001-01-15
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TA8776N
PIN
No.
NAME
FUNCTION
INTERFACE CIRCUIT
Input terminal for muting.
12
Mute
Applied voltage more than 2V to this
terminal, Muting is active.
13
14
L
−
R Filter
L + R Filter
Terminals for level control blocks.
Control current is smoothed by external
capacitors.
15
16
17
V
CC
12V
V
CC
9V
GND (Analogue)
V
CC
(12V)
V
CC
(9V)
Gnd for Analogue
―
―
―
19
20
21
22
R Out.
L Out.
L
−
R Out.
L + R Out.
Output terminals.
23
24
DAC 1
DAC 2
Open collector switches controlled by I C
bus.
2
Terminal for surround L.P.F. block.
Cut-off frequency of the surround L.P.F. is
set by external capacitor.
25
Sorround L.P.F.
fc
=
1
Hz
2
F
RC
R is registance of internal register (10kΩ
(Typ.)). C is capacitance of external
capacitor.
2001-01-15
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TA8776N
PIN
No.
NAME
FUNCTION
INTERFACE CIRCUIT
26
Balance Filter
Terminal for balance control block. Control
current is smoothed by external capacitor.
Terminal for volume control block.
27
Volume Filter
Control current is smoothed by external
capacitor.
28
SDA
Terminal for SDA.
29
SCL
Terminal for SCL.
30
GND (Digital)
Gnd for Digital.
―
2001-01-15
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TA8776N
I C BUS CONTROL
l
Main Address 80 (h) : (h) = Hexa Decimal
l
Sub Address
2
Function-sub address reference table
FUNCTION
BASS
Treble
Volume
L
−
R
L+R
Balance
Surround / DAC Input
Mode
Mute
Filter Adjustment
SUB ADDRESS
01 (h)
02 (h)
03 (h)
04 (h)
05 (h)
06 (h)
07 (h)
08 (h)
09 (h)
32 (h)
32 (h)
0 (h)
0 (h)
0 (h)
32 (h)
F0 (h)
3 (h)
0 (h)
POWER ON DEFAULT
(Center)
(Center)
(Minimum)
(Minimum)
(Minimum)
(Center)
(Normal / DAC1, 2 L / Surr. Off)
(L
−
R Mute, L + R Mute)
(Minimum)
―
―
0~0F (h)
0~64 (h)
EFFECTIVE DATA RANGE
Mode explanation (Input mode : normal)
MODE
OFF
MONO B1
STEREO A1
STEREO B1
DOLBY
MONO B2
STEREO A2
STEREO B2
MONO B3
STEREO A3
STEREO B3
OUTPUT
Lout
L
M
−
k (M) 4φ
L+k (L
−
R)
φ
L+k (L
−
R) 4φ
L
M
−
(M) 4φ
L + (L−R)
φ
L + (L−R) 4φ
M
L
L
Rout
R
M + k (M) 4φ
R
−
k (L
−
R)
φ
R
−
k (L
−
R) 4φ
R
M + (M) 4φ
R
−
(L
−
R)
φ
R
−
(L
−
R) 4φ
M
R
R
(L−R) out
―
−k
(M) 4φ
k (L
−
R)
φ
k (L
−
R) 4φ
k·D
−k
(M) 4φ
k (L
−
R)
φ
k (L
−
R) 4φ
−k
(M) 4φ
k (L
−
R)
φ
k (L
−
R) 4φ
(L+R) out
L+R
M
L+R
L+R
L+R
M
L+R
L+R
M
L+R
L+R
M
D
k
()
φ
( ) 4φ
:
:
:
:
:
Monoural Input Signal
Dolby Surround Input Signal
Co-efficient
Phase Shifted
φ
Phase Shifted 4φ
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