Sharp 66GS-62 (serv.man2) Service Manual ▷ View online
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6
BLOCK DIAGRAM
handbook, full pagewidth
MHC108
DIGITAL VCO CONTROL
AFC DETECTOR
RC VCO
VIF-PLL
VIF-AGC
TUNER AGC
SUPPLY
SIF AGC
AUDIO PROCESSING
AND SWITCHES
NARROW-BAND
FM-PLL DEMODULATOR
SINGLE REFERENCE QSS MIXER
INTERCARRIER MIXER
AND AM DEMODULATOR
SOUND TRAPS
4.5 to 6.5 MHz
TAGC
C
VAGC(pos)
C
AGC(neg)
C
BL
VAGC
(1)
TOP
14 (15)
VPLL
19 (21)
9 (8)
16
15 (16)
21 (23)
4 (2)
10 (9)
11 (10)
12 (11)
18 (20)
20 (22)
2 (31)
1 (30)
(18) 17
(7) 8
(3) 5
(4) 6
external reference signal
or 4 MHz crystal
REF
AFC
AUD
CVBS
audio output
video output
: 2 V (p-p)
[1.1 V (p-p) without trap]
C
AF
SIOMAD
SDA
SCL
MAD
V
P
C
AGC
(6, 12, 13, 14, 17,
19, 25, 28, 29, 32)
13
n.c.
AGND
7 (5)
DGND
OUTPUT
PORTS
I
2
C-BUS TRANSCEIVER
22 (24)
3 (1)
OP1
OP2
FMPLL
DEEM
AFD
sound intercarrier output
and MAD select
FM-PLL
filter
VIF-PLL
filter
de-emphasis
network
VIF2
VIF1
24 (27)
23 (26)
SIF2
SIF1
TDA9885
TDA9886
Fig.1 Block diagram.
(1)
Not connected for TDA9885.
Pin numbers for TDA9885HN in parenthesis.
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7
PINNING
SYMBOL
PIN
DESCRIPTION
TDA9886T
TDA9886TS
TDA9885T
TDA9885TS
TDA9885HN
VIF1
1
1
30
VIF differential input 1
VIF2
2
2
31
VIF differential input 2
n.c.
−
−
32
not connected
OP1
3
3
1
output port 1; open-collector
FMPLL
4
4
2
FM-PLL for loop filter
DEEM
5
5
3
de-emphasis output for capacitor
AFD
6
6
4
AF decoupling input for capacitor
DGND
7
7
5
digital ground
n.c.
−
−
6
not connected
AUD
8
8
7
audio output
TOP
9
9
8
tuner AGC TakeOver Point (TOP) for resistor adjustment
SDA
10
10
9
I
2
C-bus data input and output
SCL
11
11
10
I
2
C-bus clock input
SIOMAD
12
12
11
sound intercarrier output and MAD select with resistor
n.c.
−
−
12
not connected
n.c.
13
13
13
not connected
n.c.
−
−
14
not connected
TAGC
14
14
15
tuner AGC output
REF
15
15
16
4 MHz crystal or reference signal input
VAGC
16
−
−
VIF-AGC for capacitor
n.c.
−
16
17
not connected
CVBS
17
17
18
composite video output
n.c.
−
−
19
not connected
AGND
18
18
20
analog ground
VPLL
19
19
21
VIF-PLL for loop filter
V
P
20
20
22
supply voltage
AFC
21
21
23
AFC output
OP2
22
22
24
output port 2; open-collector
n.c.
−
−
25
not connected
SIF1
23
23
26
SIF differential input 1 and MAD select with resistor
SIF2
24
24
27
SIF differential input 2 and MAD select with resistor
n.c.
−
−
28
not connected
n.c.
−
−
29
not connected
handbook, halfpage
TDA9885TS
TDA9886TS
TDA9886TS
MHC110
VIF1
VIF2
OP1
FMPLL
DEEM
AFD
DGND
AUD
TOP
SDA
SCL
SIOMAD
SIF2
SIF1
OP2
AFC
VP
VPLL
AGND
CVBS
VAGC
(1)
REF
TAGC
n.c.
1
2
3
4
5
6
7
8
9
10
11
12
24
23
22
21
20
19
18
17
16
15
14
13
Fig.3 Pin configuration for SSOP24.
(1) Not connected for TDA9885TS.
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ABSOLUTE MAXIMUM RATINGS
Symbol
Parameter
Value
Unit
V
CC
DC Supply Voltage
±
20
V
T
stg
, T
j
Storage and Junction Temperature
–40 to 150
°C
V
FREQ
Maximum Voltage Across VFREQ (Pin 9)
8
V
T
op
Operating Temperature Range
-20 to 70
°C
ESD
Maximum ESD on Pins
±
1.8
kV
THERMAL DATA
Symbol
Parameter
Value
Unit
R
th j-amb
Thermal Resistance Junction to ambient
80
°C/W
R
th j-pin
Thermal Resistance Junction to Pin Max.
12
°C/W
PIN FUNCTIONS
N.
Name
Function
1
2
3
4
5
6
7
8
9
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
11
12
13
14
15
16
17
18
19
20
-V
CC
-V
CC
-V
CC
OUT
BOOTDIODE
BOOT
NC
FEEDCAP
FREQUENCY
SGN-GND
IN
ST-BY-MUTE
NC
+V
CC
SIGN
VREG
+V
CC
POW
-V
CC
-V
CC
-V
CC
-V
CC
NEGATIVE SUPPLY.
NEGATIVE SUPPLY.
NEGATIVE SUPPLY.
PWM OUTPUT
BOOTSTRAP DIODE ANODE
BOOTSTRAP CAPACITOR
NOT CONNECTED
FEEDBACK INTEGRATING CAPACITANCE
SETTING FREQUENCY RESISTOR
SIGNAL GROUND
INPUT
ST-BY/ MUTE CONTROL PIN
NOT CONNECTED
POSITIVE SIGNAL SUPPLY
10V INTERNAL REGULATOR
POSITIVE POWER SUPPLY
NEGATIVE SUPPLY (TO BE CONNECTED TO PIN 16 VIA C5)
NEGATIVE SUPPLY
NEGATIVE SUPPLY
NEGATIVE SUPPLY
NEGATIVE SUPPLY.
NEGATIVE SUPPLY.
PWM OUTPUT
BOOTSTRAP DIODE ANODE
BOOTSTRAP CAPACITOR
NOT CONNECTED
FEEDBACK INTEGRATING CAPACITANCE
SETTING FREQUENCY RESISTOR
SIGNAL GROUND
INPUT
ST-BY/ MUTE CONTROL PIN
NOT CONNECTED
POSITIVE SIGNAL SUPPLY
10V INTERNAL REGULATOR
POSITIVE POWER SUPPLY
NEGATIVE SUPPLY (TO BE CONNECTED TO PIN 16 VIA C5)
NEGATIVE SUPPLY
NEGATIVE SUPPLY
NEGATIVE SUPPLY
-V
CC
OUT
BOOTDIODE
N.C.
BOOT
FEEDCAP
FREQ
1
3
2
4
5
6
7
8
9
STBY/MUTE
N.C.
+V
CC SIGN
+V
CC POW
VREG
-V
CC
-V
CC
20
19
18
17
16
14
15
13
12
D96AU537B
SGN-GND
10
IN
11
-V
CC
-V
CC
-V
CC
-V
CC
PIN CONNECTION (Top view)
0
4
8
12
Area(cm
2
)
30
40
50
60
R
thj-a
(˚C/W)
D97AU675
COPPER AREA 35
µ
THICKNESS
PC BOARD
Rth with "on board" Square Heatsink vs. cop-
per area.
per area.
TDA7480
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ELECTRICAL CHARACTERISTICS (Refer to the test circuit, V
CC
=
±
14V; R
L
= 8
Ω
; R
S
= 50
Ω
;
R
f
= 12K
Ω
; Demod.. filter L = 60
µ
H, C = 470nF; f = 1KHz; T
amb
= 25°C unless otherwise specified.)
Symbol
Parameter
Test Condition
Min.
Typ.
Max.
Unit
V
S
Supply Range
±
10
±
16
V
I
q
Total Quiescent Current
R
L
=
∞
; NO LC Filter
25
40
mA
V
OS
Output Offset Voltage
Play Condition
–50
+50
mV
P
O
Output Power
THD = 10%
THD = 1%
THD = 1%
8.5
6
10
7
W
W
W
R
L
= 4
Ω
V
CC
=
±
10.5V
THD = 10%
THD = 1%
THD = 1%
10
7
W
W
W
P
d
(*)
Dissipated Power at 1W Output
Power
Power
R
f
= 12K
Ω
P
Ο
= 1W
1
W
P
DMAX
Maximum Dissipated Power
P
Ο
= 10W THD 10%
R
th-j-amb
= 38°C/W (Area 12cm
2
)
1.8
W
η
Efficiency
≡
P
O
P
O
+
P
D
≡
P
O
P
I
(**)
THD 10%
R
R
th-j-amb
= 38°C/W (Area 12cm
2
)
80
85
%
THD
Total Harmonic Distortion
R
L
= 8
Ω
; P
O
= 0.5W
0.1
%
I
max
Overcurrent Protection
Threshold
Threshold
R
L
= 0
3.5
5
A
T
j
Thermal Shut-down Junction
Temperature
Temperature
150
°C
G
V
Closed Loop Gain
29
30
31
dB
e
N
Total Input Noise
A Curve
f = 20Hz to 22KHz
f = 20Hz to 22KHz
7
12
µ
V
µ
V
R
i
Input Resistance
20
30
K
Ω
SVR
Supply Voltage Rejection
f = 100Hz; V
r
= 0.5
46
60
dB
T
r
, T
f
Rising and Falling Time
50
ns
R
DSON
Power Transistor on Resistance
0.4
Ω
F
SW
Switching Frequency
100
120
140
KHz
F
SW_OP
Switching Frequency Operative
Range
Range
100
200
KHz
B
F
Zero Signal Frequency
Constant (***)
Constant (***)
1.4x10
9
Hz
Ω
R
F
Frequency Controller Resistor
Range (****)
Range (****)
7
12
14
K
Ω
MUTE & STAND-BY FUNCTIONS
V
ST-BY
Stand-by range
0.8
V
V
MUTE
Mute Range
1.8
2.5
V
V
PLAY
Play Range (1)
4
V
A
MUTE
Mute Attenuation
60
80
dB
I
qST-BY
Quiescent Current @ Stand-by
3
5
mA
*: The output average power when the amplifier is playing music can be considered roughly 1/10 of the maximum output power. So it is useful
to consider the dissipated power in this condition for thermal dimensioning.
to consider the dissipated power in this condition for thermal dimensioning.
**: P
O
= measured across the load using the following inductor:
COIL 58120 MPPA2 (magnetics) TURNS: 28
∅
1mm
COIL77120 KOOL M
µ
(magnetics) TURNS: 28
∅
1mm
***: The zero-signal switching frequency can be obtained using the following expression: F
SW
= B
F
/R
F
****: The maximum value of R
F
is related to the maximum possible value for the voltage drop on R
F
itself.
(1): For V
12
>5.2V, an input impedance of 10K
Ω
is to be considered.
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