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參數(shù)資料
| 型號(hào)： | U4935B-ADP |
| 英文描述： | MOSFET, N, TO-3PML; Transistor type:MOSFET; Current, Id cont:2A; Resistance, Rds on:10R; Case style:TO-3PML; Current, Idm pulse:4A; Power, Pd:50W; Transistor polarity:N; Voltage, Vds max:1500V RoHS Compliant: Yes |
| 中文描述： | SECAM制式解碼器 |
| 文件頁數(shù)： | 10/16頁 |
| 文件大小： | 183K |
| 代理商： | U4935B-ADP |
U4935B
TELEFUNKEN Semiconductors
Rev. A1, 28-Jan-97
Preliminary Information
10 (16)
Identification
The identification circuit is a quadrature-type FM
demodulator which uses the bell filter as a phase shifter.
The resonance frequency of the phase shifter is adjusted
to 4.33 MHz
i.e., the frequency between the 4.25-MHz
(B–Y) carrier and the 4.40625-MHz (R–Y) carrier
during burst gating. The output of the ACC is multiplied
with the output of the phase shifter. The sample-and-hold
circuit samples the output of the multiplier during burst
gating and maintains this value outside of the burst-gate
pulse time. The identification and killer detectors
compare the sampled-and-hold voltage with internal
detection levels. Only line identification (and no field
identification) is implemented.
The identification circuit must communicate with the
U4930B (PAL/NTSC decoder) to guarantee that the out-
put signal from the decoder is available when no PAL
signal has been identified.
If a SECAM signal has been decoded, a request for
“color on” is transmitted to Pin 1 (current sink: 180 A).
If the signal request is grated (i.e., Pin q is “HIGH”
therefore no PAL), the output signals from the U4935B
are switched on and the output pins of the U4930B have
a high impedance.
If no SECAM signal has been decoded, the outputs of the
U4935B will be blanked or have high-impedance state
depending on the logic level at Pin 1.
(see table 1)
System Identification of
the U4930B
Logic Level; Pin 1 of
the U4935B
SECAM Identification of
the U4935B
SECAM; 180 A
no SECAM; 0 A
SECAM; 180 A
no SECAM; 0 A
Output Pins 9, 10 of
the U4935B
(–R–Y), –(B–Y) signals
Blanked
No PAL
HIGH (5 0 V)
HIGH (5.0 V)
PAL
LOW (1 5 V)
LOW (1.5 V)
High impedance
9611722
Bell
filter
S / H
ACC
VBLK
BGP
fH
2
16
CVBS
in
Identification
detector
output
Killer
detector
output
Bell-filter
output
Figure 19. Block diagram of the identification
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| U4943 | 制造商:APEM 功能描述:GREEN BUTTON |
| U4944 | 制造商:APEM 功能描述:GREY BUTTON |
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