TA1383AFG Datasheet, PDF (29/47 Pages) Toshiba Semiconductor – NTSC Chroma Decoder, Multi-Point Scan Sync Processor, H/V Frequency Counter IC for Color TV

Note No.
Chroma block
Characteristic
CH1 ACC characteristic
CH2 Identification sensitivity
CH3 APC frequency control sensitivity
TA1383AFG
SW Mode
SW2 SW30
Test Method
Chroma block common test conditions
(1) Write data: Transmit PREST DATA. Read data: Read DATA.
(2) Set SW2 to B, SW4 to C, SW6 to B, SW9 to On, SW12 to A, SW16 to A, SW19 to A, SW22 to B, SW23 to B, and SW24 to B,
SW28 to C, SW29 to C, and SW30 to C. Input sync signal (15.734 kHz) to TP2.
B
C (1) Input rainbow signal to the C1 IN pin (burst: chroma = 1:1).
(2) Adjust burst phase so that the lower extremity of the TP23A (Cb/Pb OUT) output waveform is at the second bar; the upper
extremity, at the 7^th bar.
(3) Change the chroma input signal amplitudes to 10, 30, 300, and 600 mVp-p and measure the TP23A (Cb/Pb OUT) output
amplitudes F11, F31, F301, and F601.
(4) Determine A2 = F31/F601 according to the measurement result in (3) above.
8
79
6
1
3 ⁴⁵
10
2
TA23A output signal waveform
F30, F300,
F600
F10
TA23A (Cb/Pb OUT) output signal waveform
10 30 300
600
C1 IN signal amplitude [mV_p-p]
B
C (1) Input rainbow signal to the C1 IN pin (burst: chroma = 1:1).
(2) Monitor TP26 (CW OUT) DC voltage.
(3) Increase input signal amplitude from 0. When TP26 (CW OUT) DC voltage reaches High (3.2 V), measure input signal
amplitude VCI.
(4) Decrease input signal amplitude from 100 mVp-p. When TP26 (CW OUT) DC voltage drops Low (1.4 V), measure input signal
amplitude VBI.
C
C (1) Connect #20 (APC FILTER) to external power supply (V20).
(2) Change external power supply (V20) voltage. When #26 (CW OUT) output frequency matches 3.579545 MHz, voltage is
referred to as Vf.
(3) Measure #26 (CW OUT) output frequency Xf (+100) and Xf (−100) in relation to Vf ± ∆Vf (±100 mVp-p). Determine free-running
sensitivity βf using the following equation.
βf = (Xf (+100) − Xf (−100))/200 [Hz/mV]
29
2005-09-05