Toshiba 29VH27E, Service Manual

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14.12.TDA1308T
14.12.1.General Description
The TDA1308 is an integrated class AB stereo headphone driver contained in an SO8 or a DIP8 plastic
package. The device is fabricated in a 1 mm CMOS process and has been primarily developed for
portable digital audio applications. It gets its input from two analog audio outputs (DACA_L and
DACA_R) of MSP3411G. The gain of the output is adjustable by the feedback resistor between the
inputs and outputs.
14.12.2.Features
• Wide temperature range
• No switch ON/OFF clicks
• Excellent power supply ripple rejection
• Low power consumption
• Short-circuit resistant
• High performance
• high signal-to-noise ratio
• High slew rate
• Low distortion
• Large output voltage swing.
14.12.3.Pinning
SYMBOL PIN DESCRIPTION
OUTA 1 Output A
INA(neg) 2 Inverting input A
INA(pos) 3 Non-inverting input A
V
SS
4 Negative supply
INB(pos) 5 Non-inverting input B
INB(neg) 6 Inverting input B
OUTB 7 Output B
V
DD
8 Positive supply
14.13.MSP34X1G (MSP3411G)
14.13.1.Description
The MSP 34x1G family of single-chip Mullet-standard Sound Processors covers the sound processing
of all analog TV -Standards worldwide, as well as the NICAM digital sound standards. The full TV sound
processing, starting with analog sound IF signal-in, down to processed analog AF-out, is performed on
a single chip. Figure shows a simplified functional block diagram of the MSP34x1G. The MSP34x1G
has all functions of the MSP34x0G with the addition of a virtual surround sound feature. Surround
sound can be reproduced to a certain extent with two loudspeakers. The MSP34x1G includes our
virtualizer algorithm “3D-PANORAMA” which has been approved by the Dolby
1)
Laboratories for
compliance with the "Virtual Dolby Surround" technology. In addition, the MSP34x1G includes the
“PANORAMA” algorithm. These TV sound processing ICs include versions for processing the multi-
channel television sound (MTS) signal conforming to the standard recommended by the Broadcast
Television Systems Committee (BTSC). The DBX noise reduction, or alternatively, Micronas Noise
Reduction (MNR) is performed alignment free. Other processed standards are the Japanese FM -FM
multiplex standard (EIA -J) and the FM Stereo Radio standard. Current ICs have to perform adjustment
procedures in order to achieve good stereo separation for BTSC and EIA-J. The MSP34x1G has
optimum stereo performance without any adjustments. All MSP 34xxG versions are pin and software
downward compatible to the MSP 34xxD. MSP34x1G further simplifies controlling software. Standard
selection requires a singleI
2
C transmission only. The MSP34x1G has built-in automatic functions: The
IC is able to detect the actual sound standard automatically (Automatic Standard Detection).
Furthermore, pilot levels and identification signals can be evaluated internally with subsequent
switching between mono/stereo/bilingual; no I
2 C interaction is necessary (Automatic Sound Selection).