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No-adjustment Sync Separator MM1108
No-adjustment Sync Separator
Monolithic IC MM1108
Outline
This IC is a no-adjustment sync separator IC designed for use in VCR, TV and other video equipment.
Features
1. Low current consumption 4.4mA typ.
2. Open collector output
3. Built-in 3V regulator handles power supply ripple
4. Built-in capacitor for vertical sync separation
5. Time from vertical signal to H. SYNC output re-sync reduced (relative to LVA519)
6. Supports both PAL and NTSC formats
7. Sync separation level can be adjusted with external constants
Package
SOP-8C (MM1108XF)
SIP-8A (MM1108XS)
DIP-8B (MM1108XD)
Applications
1. TV
2. VCR
3. VCR with camera
Block Diagram
MITSUMI
Pin Description
No-adjustment Sync Separator MM1108
Pin no. Pin name
1 VCC
2 SC
3 VCO
4 LPF
Internal equivalent circuit diagram
Function
Power supply voltage pin. Impresses 5V.
VCO integration pin
Free run frequency determined by external
capacitor between Pin 2 and GND, and
external resistor between Pin 3 and GND.
VCO input pin
Pin 4 output is input via external loop filter.
Phase comparator output pin.
5 GND
6 VIN
7 V.SYNC
8 H.SYNC
GND
Signal input pin
Inputs video signal.
V. SYNC output pin
Outputs vertical sync signal separated from
input video signal.
H. SYNC output pin
Outputs horizontal sync signal synchronized
to input video signal, except for vertical
feedback interval. For no signal, outputs
free run frequency horizontal sync signal.
MITSUMI
4.7uS
Signal 1 waveform
No-adjustment Sync Separator MM1108
Absolute Maximum Ratings
Item Symbol Ratings Units
Storage temperature T
Operating temperature T
Power supply voltage V
Allowable loss Pd 300
Electrical Characteristics
Item
Operating power supply voltage
Consumption current Id Id SW1 : b 4.4 7.0 mA
Minimum sync separation
operating current
Free-running frequency f
Symbol
VCC VCC 4.5 5.0 5.5 V
SEPA IIN SW1 : c, VR1 : H L
I
(Ta=25°C)
STG
OPR
CC max. 7 V
(Except where noted otherwise, Ta=25°C, VCC=5.0V, SW1=a, SW2=a)
Measurement
Measurement conditions Min. Typ. Max. Units
circuit
O TP1 SW1 : b 14.7 15.7 16.7 kHz
-
40~+125 °C
-
20~+75 °C
*
Package : SOP-8C
*
1153060uA
*
mW
Horizontal sync signal
acquisition range SW2 : b
H. sync pulse width t
H. sync delay time t
H. sync output voltage L V
H. sync output voltage H V
V. sync pulse width t
V. sync delay time t
V. sync output voltage L V
V. sync output voltage H V
Notes :
1 Minimum sync separation operating current measurement
*
Given SW1 : c, change VR1 from high to low, and measure current flowing on I
output switches from high to low.
2 Signal 1 : Rectangular wave signal with 0.3V amplitude and pulse width 4.7µS
*
CAP TP1
f
W1 TP1 VIN : signal 1, 15.73kHz
d1 TP1 VIN : signal 1, 15.73kHz
L1 TP1 VIN : signal 1 ,15.73kHz
H1 TP1 VIN : signal 1, 15.73kHz
W2 TP2 VIN : staircase wave 1VP-P
d2 TP2 VIN : staircase wave 1VP-P
L2 TP2 VIN : staircase wave 1VP-P
H2 TP2 VIN : staircase wave 1VP-P
V
IN : signal 1, 15.73kHz
2 *3
*
2.1 2.7 kHz
4 4.3 4.7 5.1 uS
*
4
-
*
4 0.2 0.4 V
*
4 4.8 5.0 V
*
*
*
*
*
0.3 0.2 0.7 uS
5 140 200 260 uS
5 6.0 10.0 20.0 uS
5 0.2 0.4 V
5 4.8 5.0 V
IN when TP2
3 Measuring horizontal sync signal pull-in range
*
Given SW1 : a and SW2 : b, with TP1 waveform not synchronized to signal 1, adjust VR2 so that
they are synchronized. Next, switch SW1 to b, and measure TP1 output free run frequency. The
horizontal signal pull-in range is the smaller of the measured value and the difference from
15.73kHz.
MITSUMI
tw2
t
d2
V
H2
V
L2
Input video signal
(Horizontal sync
signal portion)
TP2 waveform
tw1
t
d1
V
H1
V
L1
Signal 1
TP1 waveform
4 H. SYNC measurement
*
5 V. SYNC measurement
*
No-adjustment Sync Separator MM1108
Measuring Circuit
MITSUMI
Application Circuits
Application Circuit 1
No-adjustment Sync Separator MM1108
Application Circuit 2
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