TENTATIVE
TOSHIBA Bi-CMOS INTEGRATED CIRCUIT, SILICON MONOLITHIC
TB1254N
PAL / NTSC / SECAM 1CHIP (IF+VCD PROCESSOR) IC
The TB1254N is a TV signal processor IC, which contains
PIF, SIF, Video, Chroma and deflection signal processors
for worldwide Multi-color systems. Also, it has AV switch
for TV/EXT inputs.
The line-up and flexibility of this TB1251 series contributes
to reduce development costs and components in a TV
sets.
SDIP56-P-600
Weight: 5.55g (typ)
FEATURES
IF STAGE
Multi-system IF
SIF 4.5 ~ 6.5 MHz
One External BPF for Multi-SIF carrier
Inter carrier inputs
VCO tank coil alignment free
for L system,
Positive demodulation
V low Ch
TEXT STAGE
Built-in AKB
AKB on/off
AKB Color temperature control
Analog RGB interfaces
ABL / ACL
DEFLECTION STAGE
Built-in H-VCO
ramp distortion correction
Stand Along Sync in port
Sand Castle Pulse Output
(HD+VD+Gate Pulse)
AV SWITCH
VIDEO STAGE
Built-in Y delay line (8 adjustable steps)
Built in C trap filter (Switchable)
CHROMA STAGE
Multi-color Demoduration
Automatic Chroma Identification
1 Xtal for Multi-color Systems
(3.58MHz/4.43MHz/M-PAL/N-PAL)
Built-in1H Delay line
Cb/Cr input ports
Built-in BPF / TOF
Fsc Output
Two NTSC demodulation phase
Visual TV / EXT inputs
Audio TV / EXT inputs
TOSHIBA is continually working to improve the quality and the reliability of its products. Nevertheless,
semiconductor devices in general can malfunction or jail due to their inherent electrical sensitivity and
vulnerability to physical stress. It is the responsibility of the buyer, when utilizing TOSHIBA products, to
observe standards of safety, and to avoid situations in which a malfunction or failure of a TOSHIBA product could
cause loss of human life, bodily injury or damage to property. In developing your designs, please ensure that
TOSHIBA products are used within specified operating range as set forth in the most recent products specifications.
Also, please keep in mind the precautions and conditions set forth in the TOSHIBA Semiconductor Reliability
Handbook.
The products described in this document are subject to foreign exchange and foreign trade control laws.
The information contained herein is presented only as a guide for the applications of our products. No
responsibility is assumed by TOSHIBA CORPORATION for any infringements of intellectual property or other rights of
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Ver3.7
00/01/28
1
SDA
+
Dig GND
SCL
Y IN
EXT IN
BLACK Det
+
DC Restor
Dig.VDD
H.AFC
C in
Cb in
Cr in
FBP IN/SCP OUT
LOOP Filter
MONITOR OUT
YC Vcc(5V)
+
EXT AUDIO IN
IF DET OUT
AFT OUT
TV in
Sync in
DE-EMP.
DC NF
+
Hcorr IN/SIF IN
56
55
54
53
52
51
50
49
48
47
46
45
44
43
42
41
40
39
38
37
36
35
34
33
32
31
30
29
I2C Bus
IF
6dB
DEF Proc.
Y Proc.
EHT H/V
<EHT.H>
<EHT.V>
FM DEMOD.
PIF Proc.
L-SECAM
PAL/NTSC/SECAM
1H delay line
1 X'tal
<TINT>
<color system>
<F ID>
<Killer Sence>
Clamp
BBTINT
Chroma DEMOD.
H,V synchronization
<Lock det.>
<Sync det>
<AFC1 Gain>
Gain Sw
SIF
Processor
Chroma Baseband Proc.
<Color>
<Unicolor>
Mode SW
<c-trap>
<B.S.>
<DC rest>
<ƒÁ>
<DL>
<P.SHARP>
<S.CONT>
<CONT>
<BRT>
<H.T>
EW PROC.
<H.SIZE>
<EW PARA.>
<TRAPEZIUM>
<EW CONER>
6.5MHz
Uni-SIF beet up
Clamp
C-TRAP
Black Stretch
DC restore
Y-ƒÁ
Y-D.L.
A.C.
Sub-Cont
Uni-Color
Bright
WPS
Half T.
<ABL START P>
<ABL GAIN>
Matrix / SW
RGB Interface
Bright <RGB BRT>
Uni-Color<RGB CONT>
AUDIO ATT
V
Cutoff/Drive
<R.G.B.CUTTOFF>
<R.G.B.DRIVE>
<AKB SW>
<AKB W/B controle>
PROC.
<V.SIZE>
<V.LINEAR.>
<V-S CORR.>
<V.SHIFT>
<ATT>
BIAS
5
+
1
N.C.
2
3
4
6
7
8
9
10
11
+
12
13
14
+
15
Ys/Ym
16
17
18
19
20
21
22
23
24
25
26
27
28
+
+
IK IN
V NFB
G OUT
R OUT
B OUT
V OUT
EXT.G IN
EXT.B IN
EXT.R IN
IF GND
ref R
AUDIO OUT
YC GND
SIF OUT
ABCL IN
CW OUT
4.43MHz X'tal
APC Filter
RGB Vcc(9V)
Ripple F
SAW
IF IN
+
Ver3.7
TB1254N BLOCK DIAGRAM
H Vcc(9V)
TRAP
6.5MHz
‚a‚o‚e
H OUT
PIF tank
+
+
IF AGC
RF AGC
V RAMP
IF Vcc(5V)
00/01/28
2
TERMINAL INTERFACE
PIN NAME
1
2
IF VCC
RIPPLE
FILTER
FUNCTION
A Vcc terminal for the IF circuit.
Supply 5V.
A terminal to be leaded to an internal bias
filter. Put a capacitor.
INTERFACE
•
1
1kĦ
330Ħ
2kĦ
2
330Ħ
27.5kĦ
45kĦ
5
3
SIF OUT
An output terminal for a 1st SIF signal, that
beaten down by a regenerated carrier.
The SIF frequencies are able to convert into
only 6.5MHz, in order to eliminate SIF BPFs
to single 6.5MHz.
9V
100Ħ
14
500Ħ
15kĦ
3
16kĦ
16.3kĦ
5
4
AUDIO OUT
An output terminal for audio signal.
FM Det.signal or the external audio signal,
input to pin53, is output (Switched by bus).
An internal audio attenator controles the
output levelS.
•
9V
100Ħ
14
ATT
4
50kĦ
5.3V
30kĦ
5
5
6
7
IF GND
IF IN
IF IN
The GND terminal for IF circuit.
Input terminals for IF signals. Pin 6 and 7 are
the both input poles of a differential amplifier.
The norminal input level is 90dB(•V)(Pin6-7),
input impedance is 1.5 k ohms.
•
1
100kĦ
6
7
1.44kĦ
1.44kĦ
1.5V
2.75V
5
8
NC
-
Ver3.7
00/01/28
3
PIN NAME
9
RF AGC
FUNCTION
An output terminal for RF AGC.
A pull up resister is required because of its
open collector output, and also connect de-
coupling capacitor to reduce noises,.
INTERFACE
9V
14
9
300Ħ
30kĦ
30kĦ
to SELF ADJ
5
10
IF AGC
A terminal to be connected to an IF AGC
filter. Connect 2.2•F of capacitor to Vcc
1
10
2kĦ
5
11
APC FILTER
A terminal to be connected with an APC filter
for chroma demodulation.
This terminal voltage controls the frequency
of VCXO.
110kĦ
42
11
220Ħ
3.2V
19
12
X’TAL
(4.43MHZ)
A terminal to be connected with a
4.433619MHz X’tal oscillator. The oscillated
signal lead to chroma demodulation, H out
frequency tuning, AFT and so on.
42
12
2.5kƒ ¶
500ƒ ¶
13
CW OUT
An output terminal for the continuous chroma
sub-carrier frequency wave, which amplitude
is 0.7Vp-p (typ).
Also the dc level shows killer status, the level
is 1.5V for B/W and 3.5V for Color.
19
42
1kĦ
13
200Ħ
19
Ver3.7
00/01/28
4
PIN NAME
14
RGB VCC (9V)
FUNCTION
A Vcc terminal for RGB block, PIF det. Output
and sound output circuit.
Supply 9V.
A terminal for switching of EXT RGB Mode
and fast Half tone.
INTERFACE
•
15
YS/YM SW
•Spot
killer
42
15
250Ħ
3.3V
0.7V
14
16
17
18
EXT. R IN
EXT. G IN
EXT. B IN
Input terminals for EXT RGB signals. The
signals are clamped by capacitors, therefore
the input impedance should be low, 100
ohms or less is recommended.
For this input, brightness and RGB contrast
are available, also ABL/ACL eliminate the
output leval. This ABL/ACL is able to off.
OFF: for small area like OSD
ON: for large area like TELETEXT
(input level 0.7Vp-p/100IRE)
42
16
17
18
250Ħ
250Ħ
250Ħ
250Ħ
100uA
2.3V
19
19
20
21
22
Y/C GND
R OUT
G OUT
B OUT
The GND terminal for Y/C circuit.
Terminals for R/G/B signal output.
Connect resistances to GND, if through rate
is not enough. Because of source current
limitation, the resistances should be 2.0k• or
more.
•
14
20
100Ħ
21
22
19
23
IK IN
An input terminal to sense AKB cathode
current.
Connect this terminals to GND if not using
the AKB system.
42
VK
1kĦ
1kĦ
2.5kĦ
2.5kĦ
2.5kĦ
23
5kĦ
12.5kĦ
25kĦ
50kĦ
VF
soft
start
19
limitter
over circuit
Ver3.7
00/01/28
5
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