
MITSUBISHI ICs (TV)
M52761SP/FP
PLL-SPLIT VIF/SIF IC
1
DESCRIPTION
The M52761 is IF signal-processing IC for VCRs and TVs. It enable
the PLL detection system despite size as small as that of
conventional quasi-synchronous VIF/SIF detector, IF/RF AGC, SIF
limiter, FM detector, QIF AGC and EQ AMP.
FEATURES
Video detection output is 2V
The video detector uses PLL for full synchronous detection
circuit. It produces excellent characteristics of DG, DP, 920kHz
beat, and cross color.
Dynamic AGC realizes high speed response with double filter.
Video IF and sound IF signal processings are separated from
each other. VCO output is used to obtain intercarrier.
This PLL-SPLIT method and built-in QIF AGC provide good
sound sensitivity and reduces buzz.
As AFT output voltage uses the APC output voltage, VCO coil is
not used.
Audio FM demodulation uses PLL system, so it has wide
frequency range with no external parts and no adjustment.
This IC corresponds to only NTSC system.
P-P
. It has built-in EQ AMP.
APPLICATION
TV sets, VCR tuners
RECOMMENDED OPERATING CONDITION
In case of Vcc and Vreg. out short
Supply voltage range....................................................4.75 to 5.25V
Recommended supply voltage...................................................5.0V
In case of Vreg. out open
Supply voltage range......................................................8.5 to 12.5V
PIN CONFIGURATION (TOP VIEW)
Outline 20P4B (SP)
20P2N-A (FP)
20
17
18
19
1
4
3
2
16
5
15
6
14
7
13
8
12
9
11
10
VCO COIL
VIDEO OUT
Vreg. OUT
LIMITER IN
APC FILTER
VCO COIL
Vcc
RF AGC OUT
GND
VIF IN
NFB
VIF IN
AFT OUT
AUDIO OUT
IF AGC FILTER
RF AGC DELAY
EQ F/B
IF AGC FILTER
QIF DET IN
QIF OUT
M
BLOCK DIAGRAM
Split
Inter
Vcc REG
EQ
AMP
20
19
18
17
16
15
14
12
11
2
3
6
8
10
VIDEO
DET
FM DET
LIM AMP
AF AMP
QIF AMP
IF AGC
RF AGC
APC
VIF AMP
VCO
AFT
4
5
13
QIF DET
9
7
1
VCO COIL
VIDEO OUT
Vreg. OUT
LIMITER IN
APC FILTER
VCO COIL
Vcc
RF AGC OUT
GND
VIF IN
NFB
VIF IN
AFT OUT
AUDIO OUT
IF AGC FILTER
RF AGC DELAY
EQ F/B
IF AGC FILTER
QIF DET IN
QIF OUT
QIF AGC