MITSUBISHI ICs (TV)
M52761SP/FP
PLL-SPLIT VIF/SIF IC
DESCRIPTION
PIN CONFIGURATION (TOP VIEW)
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.
RF AGC DELAY
AFT OUT
RF AGC OUT
VIF IN
EQ F/B
1
2
20
19
APC FILTER
3
18 VIDEO OUT
17 Vreg. OUT
FEATURES
4
• Video detection output is 2VP-P. It has built-in EQ AMP.
• The video detector uses PLL for full synchronous detection
circuit. It produces excellent characteristics of DG, DP, 920kHz
beat, and cross color.
5
16
VIF IN
VCO COIL
GND
VCO COIL
Vcc
6
15
14
13
12
QIF DET IN
IF AGC FILTER
NFB
7
• 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.
QIF OUT
IF AGC FILTER
8
9
10
11 LIMITER IN
AUDIO OUT
• As AFT output voltage uses the APC output voltage, VCO coil is
not used.
Outline 20P4B (SP)
• Audio FM demodulation uses PLL system, so it has wide
20P2N-A (FP)
frequency range with no external parts and no adjustment.
• This IC corresponds to only NTSC system.
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
BLOCK DIAGRAM
APC FILTER
Vreg. OUT
17
VCO COIL
15
QIF OUT
LIMITER IN
11
EQ F/B
20
VIDEO OUT
VCO COIL
16
Vcc
14
IF AGC FILTER
19
18
13
12
Vcc REG
VCO
LIM AMP
Inter
Split
AFT
QIF DET
EQ
AMP
VIDEO
DET
QIF AGC
APC
QIF AMP
FM DET
AF AMP
RF AGC
IF AGC
8
VIF AMP
10
1
2
3
4
5
6
7
9
RF AGC DELAY
RF AGC OUT
VIF IN
QIF DET IN
NFB
AFT OUT
VIF IN
GND
IF AGC FILTER
AUDIO OUT
1