M52761SP Datasheet, PDF (1/7 Pages) Mitsubishi Electric Semiconductor – PLL-SPLIT VIF/SIF IC

MITSUBISHI ICs (TV)
M52761SP/FP
PLL-SPLIT VIF/SIF IC
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 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.
• 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.
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)
RF AGC DELAY 1
AFT OUT 2
RF AGC OUT 3
VIF IN 4
VIF IN 5
GND 6
QIF DET IN 7
IF AGC FILTER 8
NFB 9
AUDIO OUT 10
20 EQ F/B
19 APC FILTER
18 VIDEO OUT
17 Vreg. OUT
16 VCO COIL
15 VCO COIL
14 Vcc
13 QIF OUT
12 IF AGC FILTER
11 LIMITER IN
Outline 20P4B (SP)
20P2N-A (FP)
BLOCK DIAGRAM
APC FILTER
Vreg. OUT
VCO COIL
QIF OUT
LIMITER IN
EQ F/B
VIDEO OUT
VCO COIL
Vcc
IF AGC FILTER
20
19
18
17
16
15
14
13
12
11
VCO
Vcc REG
Inter
Split
LIM AMP
AFT
EQ
AMP
VIDEO
DET
APC
VIF AMP
RF AGC
QIF DET
QIF AGC
QIF AMP
FM DET
IF AGC
AF AMP
1
2
3
4
RF AGC DELAY
RF AGC OUT
AFT OUT
VIF IN
5
VIF IN
6
GND
7
8
9
QIF DET IN
NFB
IF AGC FILTER
10
AUDIO OUT
1