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TX0
TX1
HITEMP
TXON
7.1.2 Front end amplifier
Between duplex filters X1 and X2 is a one transistor stage Q7 which amplifies a RX
signal to a proper level to the phone. It compensates losses generated in the duplex
filters and RF cables. The amplifier is operational as long as the phone is fixed in the
phone holder.
7.1.3 DC power and control logic
DC power from the vehicle's battery is fed to connector V2. The specified voltage
range is 10.8 V to 15.6 V. A 3.3 V regulator I5 gets a power directly. After the phone
is placed in the phone holder, a risen voltage level at I2C bus is detected by diode
pair D5 and FET Q8 which activates the regulator. A booster detection control
BODET rises up and an I2C remote I/O IC I6 will be ready to communicate with the
phone.
7.1.4 Testpoint levels
Voltage levels at testpoints are measured in middle channel and using 13.6 V power
supply voltage. Levels will vary because of component tolerances.
Testpoint
TP1
TP2
TP3
TP4
V6
V7
V8
V9
V10
V11
V12
V13
V14
V15
V16
8tdb60gb.fm
Power OFF
PL1 150 mW
x
LOW
x
LOW
x
HIGH
HIGH
LOW
low power
mid. power
3.5
3.5
9.6
9.6
13.6
13.5
13.6
13.5
0.25
0.74
129
142
0.49
0.51
4.88
5.41
0.7
0.7
0.7
0.7
0
0.7
0
0
0
0
5.17
5.70
13.6
13.5
Product: TDB-60-N/B /
1.3.1999
PL2 1.5 W
HIGH
LOW
HIGH
LOW
high power
high power unit
- 3 dB
3.5
3.5
9.6
9.6
13.5
13.4
13.5
13.4
1.68
2.48
167
190
0.53
0.56
6.21
6.94
0.7
0.7
0.7
0.3
0
0
0.7
0.7
0
0.7
6.50
7.23
13.5
13.4
PL3 15W
PL3 7W
LOW
LOW
HIGH
HIGH
LOW
HIGH
LOW
LOW
V
V
V
V
V
mV
V
V
V
V
V
V
V
V
V
3
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