Sharp 28JF-73H (serv.man21) Service Manual ▷ View online
21
28JF-73H
PWB B CHASSIS LAYOUT (CRT SOCKET UNIT, FB218N2).
PWB C CHASSIS LAYOUT (FRONTAL POWER-CONTROL UNIT, FB270ZZ).
PWB D CHASSIS LAYOUT (DOUBLE FOCUS UNIT, FB220ZZ).
22
28JF-73H
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)
(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
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)
(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
C
L
< 20 pF; R
L
> 1 k
Ω
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
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
video signal
see Fig.11; note 5
56
59
−
dB
PSRR
CVBS
power supply ripple rejection at
pin CVBS
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
50
µ
s de-emphasis
430
540
650
mV
THD
total harmonic distortion of audio
signal
signal
FM: 27 kHz FM deviation;
50
50
µ
s de-emphasis
−
0.15
0.50
%
AM: m = 54%
−
0.5
1.0
%
23
28JF-73H
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
Ω
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
Ω
. 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
dependent on FM-PLL filter
80
100
−
kHz
S/N
W(AF)
weighted signal-to-noise ratio of
audio signal
audio signal
FM: 27 kHz FM deviation;
50
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
FM demodulator
50
µ
s de-emphasis;
AM: f = 1 kHz and m = 54%;
referenced to 27 kHz
FM deviation
referenced to 27 kHz
FM deviation
40
46
−
dB
PSRR
AUD
power supply ripple rejection on
pin AUD
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)
(RMS value)
QSS mode; SC
1
; SC
2
off
90
140
180
mV
L standard;
without modulation
without modulation
90
140
180
mV
intercarrier mode;
SC
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)
(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
(
)
24
28JF-73H
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.
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