28JW-74H (serv.man11). ICs additional information - Sharp TV Service Manual (repair manual)

28jw-74h (serv.man11) service manual
Model
28JW-74H (serv.man11)
Pages
15
Size
163.55 KB
Type
PDF
Document
Service Manual
Brand
Device
TV / CTR / ICs additional information
File
28jw-74h-sm11.pdf
Date

Read Sharp 28JW-74H (serv.man11) Service Manual online

21
28JW-74H
ICs ADDITIONAL INFORMATION
TDA9885 (IC201)
5
QUICK REFERENCE DATA
SYMBOL
PARAMETER
CONDITIONS
MIN.
TYP.
MAX.
UNIT
V
P
supply voltage
notes 1 and 2
4.5
5.0
5.5
V
I
P
supply current
52
63
70
mA
Video part
V
i(VIF)(rms)
VIF input voltage sensitivity
(RMS value)
1 dB video at output
60
100
µ
V
G
VIF(cr)
VIF gain control range
see Fig.7
60
66
dB
f
VIF
vision carrier operating frequencies
see Table 14
33.4
MHz
33.9
MHz
38.0
MHz
38.9
MHz
45.75
MHz
58.75
MHz
f
VIF
VIF frequency window of digital
acquisition help
related to f
VIF
; see Fig.10
±
2.3
MHz
V
o(video)(p-p)
video signal output voltage
(peak-to-peak value)
see Fig.5
normal mode
1.7
2.0
2.3
V
trap bypass mode
0.95
1.10
1.25
V
G
dif
differential gain
“CCIR 330”; note 3
B/G standard
5
%
L standard
7
%
ϕ
dif
differential phase
“CCIR 330”
2
4
deg
B
video(
1dB)
1 dB video bandwidth
trap bypass mode; AC load;
C
L
< 20 pF; R
L
> 1 k
5
6
MHz
B
video(
3dB)(trap)
3 dB video bandwidth including
sound carrier trap
note 4
f
trap
= 4.5 MHz
3.95
4.05
MHz
f
trap
= 5.5 MHz
4.90
5.00
MHz
f
trap
= 6.0 MHz
5.40
5.50
MHz
f
trap
= 6.5 MHz
5.50
5.95
MHz
α
SC1
trap attenuation at first sound
carrier
M/N standard
30
36
dB
B/G standard
30
36
dB
S/N
W(video)
weighted signal-to-noise ratio of
video signal
see Fig.11; note 5
56
59
dB
PSRR
CVBS
power supply ripple rejection at
pin CVBS
f
ripple
= 70 Hz; see Fig.6;
note 6
20
25
dB
AFC
stps
AFC control steepness
definition:
I
AFC
/
f
VIF
0.85
1.05
1.25
µ
A/kHz
Audio part
V
o(AF)(rms)
AF output voltage (RMS value)
27 kHz FM deviation;
50
µ
s de-emphasis
430
540
650
mV
THD
total harmonic distortion of audio
signal
FM: 27 kHz FM deviation;
50
µ
s de-emphasis
0.15
0.50
%
AM: m = 54%
0.5
1.0
%
22
28JW-74H
TDA9885 (IC201)
Notes
1. Values of video and sound parameters can be decreased at V
P
= 4.5 V.
2. For applications without I
2
C-bus, the time constant (R
×
C) at the supply must be >1.2
µ
s (e.g. 1
 and 2.2
µ
F).
3. Condition: luminance range (5 steps) from 0% to 100%.
4. AC load: C
L
< 20 pF and R
L
> 1 k
. The sound carrier frequencies (depending on the TV standard) are attenuated
by the integrated sound carrier traps (see Figs 13 to 18;
H (s)
 is the absolute value of transfer function).
5. S/N
W(video)
 is the ratio of the black-to-white amplitude to the black level noise voltage (RMS value measured on
pin CVBS). B = 5 MHz weighted in accordance with
“CCIR 567”.
6. Conditions: video signal, grey level, positive and negative modulation.
7. The intercarrier output signal at pin SIOMAD can be calculated by the following formula taking into account the
internal video signal with 1.1 V (p-p) as a reference:
 (RMS), where:
 is the correction term for RMS value,
is the sound-to-picture carrier ratio at pins VIF1 and VIF2 in dB, 6 dB is the correction term of internal
circuitry and
±
3 dB is the tolerance of video output and intercarrier output V
o(intc)(rms)
.
8. Pin REF is able to operate as a 1-pin crystal oscillator input as well as an external reference signal input, e.g. from
the tuning system.
B
AF(
3dB)
3 dB AF bandwidth
without de-emphasis;
dependent on FM-PLL filter
80
100
kHz
S/N
W(AF)
weighted signal-to-noise ratio of
audio signal
FM: 27 kHz FM deviation;
50
µ
s de-emphasis;
vision carrier unmodulated
52
56
dB
AM: m = 54%
45
50
dB
α
AM(sup)
AM suppression of
FM demodulator
50
µ
s de-emphasis;
AM: f = 1 kHz and m = 54%;
referenced to 27 kHz
FM deviation
40
46
dB
PSRR
AUD
power supply ripple rejection on
pin AUD
f
ripple
= 70 Hz; see Fig.6
for AM
20
26
dB
for FM
14
20
dB
V
o(intc)(rms)
IF intercarrier output level
(RMS value)
QSS mode; SC
1
; SC
2
off
90
140
180
mV
L standard;
without modulation
90
140
180
mV
intercarrier mode;
SC
1
; SC
2
off; note 7
mV
Reference frequency
f
ref
reference signal frequency
note 8
4
MHz
V
ref(rms)
reference signal voltage
(RMS value)
operation as input terminal
80
400
mV
SYMBOL
PARAMETER
CONDITIONS
MIN.
TYP.
MAX.
UNIT
V
o(intc)
1.1 V (p-p)
1
2 2
-----------
×
10
V
i SC
(
)
V
i PC
(
)
--------------- dB
(
)
6 dB
3 dB
±
+
20
----------------------------------------------------------------
×
=
1
2 2
-----------
V
i SC
(
)
V
i PC
(
)
--------------- dB
(
)
23
28JW-74H
TDA9885 (IC201)
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.
24
28JW-74H
TDA9885 (IC201)
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
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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