參數(shù)資料
型號： TDA935X
廠商： NXP Semiconductors N.V.
英文描述： TV signal processor-Teletext decoder with embedded m-Controller
中文描述： 電視信號處理器與嵌入式米圖文電視解碼器控制器
文件頁數(shù)： 120/140頁
文件大小： 570K
代理商： TDA935X
1999 Sep 28
120
Philips Semiconductors
Preliminary Device Specification
TV signal processor-Teletext decoder with
embedded
μ
-Controller
TDA935X/6X/8X series
Notes
1.
When the 3.3 V supply is present and the
μ
-Controller is active a ‘low-power start-up’ mode can be activated. When
all sub-address bytes have been sent and the POR and XPR flags have been cleared the horizontal output can be
switched-on via the STB-bit (subaddress 24H). In this condition the horizontal drive signal has the nominal T
OFF
and
the T
ON
grows gradually from zero to the nominal value. As soon as the 8 V supply is present the switch-on procedure
(e.g. closing of the second loop) is continued.
On set AGC.
This parameter is not tested during production and is just given as application information for the designer of the
television receiver.
Loop bandwidth BL = 60 kHz (natural frequency fN = 15 kHz; damping factor d = 2; calculated with top sync level as
FPLL input signal level).
The IF-PLL demodulator uses an internal VCO (no external LC-circuit required) which is calibrated by means of a
digital control circuit which uses the clock frequency of the
μ
-Controller as a reference. The required IF frequency for
the various standards is set via the IFA-IFC bits in subaddress 27H. When the system is locked the resulting IF
frequency is very accurate with a deviation from the nominal value of less than 25 kHz.
This parameter is not tested during production but is guaranteed by the design and qualified by means of matrix
batches which are made in the pilot production period.
Measured at 10 mV (RMS) top sync input signal.
Via this pin (38) both the demodulated IF signal and the selected CVBS (or Y+C) signal can be supplied to the output.
The selection between both signals is realised by means of the SVO bit in subaddress 22H.
So called projected zero point, i.e. with switched demodulator.
10. Measured in accordance with the test line given in Fig.49. For the differential phase test the peak white setting is
reduced to 87%.
The differential gain is expressed as a percentage of the difference in peak amplitudes between the largest and
smallest value relative to the subcarrier amplitude at blanking level.
The phase difference is defined as the difference in degrees between the largest and smallest phase angle.
2.
3.
4.
5.
6.
7.
8.
9.
B
EAM CURRENT LIMITING
,
NOTE
55
C.7.1
contrast reduction starting
voltage
voltage difference for full
contrast reduction
brightness reduction starting
voltage
voltage difference for full
brightness reduction
internal bias voltage
detection level vertical guard
minimum input current to
activate the guard circuit
maximum allowable current
3.5
V
C.7.2
2
V
C.7.3
2.5
V
C.7.4
1
V
C.7.5
C.7.6
C.7.7
3.3
3.65
tbf
V
V
mA
C.7.8
tbf
mA
F
IXED BEAM CURRENT SWITCH
-
OFF
;
NOTE
56
C.8.1
discharge current during
switch-off
discharge time of picture tube
0.85
1.0
1.15
mA
C.8.2
38
ms
NUMBER
PARAMETER
CONDITIONS
MIN.
TYP.
MAX.
UNIT
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