16.4.
TDA7265:
The TDA7265 is a 25W+25W stereo sound amplifier with mute/stand-by facility. STPA control signal coming
from microcontroller (when it is at high level) activates the mute function. IC is muted when mute port is at low
level. Two stereo audio signals coming from audio module is injected to the inputs of the IC and a power of
12Wrms (10%) is obtained. An external pop-noise circuitry pulls AF inputs of the IC in order to eliminate pop
noise when TV is turned on or off via mains supply connection. It is possible to adjust the gain of the amplifiers by
feedback external resistors.
16.4.1.
Features:
•
Wide supply voltage range (up to 50V ABS Max.)
•
Split supply
•
High output power: 25+25 W @ TDA = 10%, R
L
= 8ohm, V
S
= ±20V
•
No pop at turn-on / off
•
Mute (pop free)
•
Stand-By feature (low I
Q
)
•
Few external components
•
Thermal overload protection
•
Adjustable gain via an external resistor
16.4.2.
Pinning:
1. Output (1)
2. +Vs
3. Output (2)
4. Mute / St-By
5. -Vs
6. Input (2)
7. Ground
8. Input (1)
16.5.
TDA6108Q:
The TDA6108Q consists of three monolithic video output amplifiers. The amplifier can be seen as an operational
amplifier with negative feedback. The advantage of negative feedback is that the amplifier characteristics do not
play an important role up to certain frequencies. The internal flash diodes protect the amplifiers against flash over
in the picture tube. The only protections required at the cathode outputs are a flash resistor and a spark gap.
Furthermore, the device needs only one power supply voltage (Vdd). The TDA6108Q is provided with a black
current data pin.
16.5.1.
Features:
•
No external components, only the well known supply decoupling
•
Very simple application with a variety of colour decoders
•
Black-current measurement output for automatic black current stabilisation
•
Only one supply voltage needed
•
Internal protection against positive appearing CRT flash-over discharges
•
Protection against ESD
•
Internal reference voltage
•
Thermal protection
•
Controllable switch-off behaviour
•
Very small PCB dimensions
•
Very high replacement value
PINNING
PIN VALUE
1. Inverting input 1
:2Vpp
2. Inverting input 2
:2Vpp
3. Inverting input 3
:2Vpp
4. Ground
5. BSC-output
:Max:7V
