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LA7337 Datasheet(PDF) 4 Page - Sanyo Semicon Device

Part No. LA7337
Description  SECAM-Format VCR Chroma Signal-Processing Circuit
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Maker  SANYO [Sanyo Semicon Device]
Homepage  http://www.ssdc-jp.com/eng/
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No. 5288-4/7
LA7337
[Record/playback mode settings]
Pin 16 = low
→ record mode
Pin 16 = high
→ playback mode
[Bell filter offset adjustment]
Increasing the pin 6 voltage increases the 1.1-MHz bell filter center frequency (f0).
Increasing the pin 5 voltage increases the 4.3-MHz bell filter center frequency (f0).
[Test mode settings]
The IC enters test mode if pin 6 is set to 5 V. The pin 5, 11, 17, and 26 outputs behave as follows in this mode.
Pin 5: The 4.43-MHz VCO output appears (However, note that a load of about 1 k
Ω is required between this pin and
VCC.)
Pin 11: The 1.1-MHz band-pass filter output appears.
Pin 17: The 4.3-MHz band-pass filter output appears.
Pin 26: The BGP (used for SECAM discrimination, playback AGC, and record killer) can be monitored.
Standard Input Signal Levels
Continued from preceding page.
Parameter
Symbol
Conditions
Ratings
Unit
min
typ
max
Playback mode phase detector output
V5 = V6 = 0 V, SW8B = on, V16 = 5 V,
difference voltage (1)
VSCPD1
S27 = composite sync., S13 = sine wave
150
180
mV
(50 mVp-p, f = 1.0625/1.1016 MHz)
Playback mode phase detector output
VSCPD2
As above, except S13 = sine wave
100
mV
difference voltage (2)
(50 mVp-p, f = 627 kHz)
Playback mode SECAM discriminator
VSCMP1
V16 = 5 V, SW23 = SW24 = On
4.5
V
characteristics (1)
Playback mode SECAM discriminator
VSCMP2
V16 = 5 V, SW23 = SW24 = On
0.5
V
characteristics (2)
SECAM discriminator comparator
VTCOMP SW25 = On
3.2
3.5
3.8
V
threshold voltage
Record/playback control threshold voltage
VTRP
2.3
2.5
2.7
V
V16 = 0 V, SW25 = on, V25 = 3 V,
Forced SECAM mode threshold voltage
VTHSM
S27 = composite sync., S15 = sine wave
4
V
(200 mVp-p, f = 4.286 MHz)
V16 = 0 V, SW25 = on, V25 = 4 V,
Forced mute mode threshold voltage
VTHMM
S27 = composite sync., S15 = sine wave
1
V
(200 mVp-p, f = 4.286 MHz)
Reference voltage
VREG
4.1
4.3
4.5
V
REC-IN (pin 15)
The 200 mVp-p ID component
PB-IN (pin 13)
50 mVp-p
Internal filter group delay times (reference values)
1.1 MHz BPF
460 ns (PB) 430 ns (REC)
2.2 MHz BPF
180 ns
4.3 MHz BPFA
230 ns
4.3 MHz BPFB
170 ns
[Muting control table]
Voltage applied to pin 1
Output signal mode (pins 17 and 11)
4 V or higher
Forced SECAM
Open
AUTO (Uses the output of the internal discriminator)
1 V or lower
Forced mute mode




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