Document
Ordering number : EN4832B
Monolithic Linear IC
LA7356, LA7356M
For Use in VCR Products PAL/SECAM (MESECAM) Discrimination IC
Overview
The LA7356 and LA7356M are PAL/SECAM discrimination ICs. Since these products do not require external circuits such as ceramic filters and tank resonators, the number of external components is reduced. Thus they allow the discriminator block to be implemented in a smaller space and at a lower cost.
Functions
• Burst/CW switching • Limit amplifier • Frequency - phase conversion • Phase comparator • Comparator
Features
• These products enable the implementation of discrimination circuits with high sensitivity even with weak signals or with strong burst input levels.
• Ceramic capacitors are the only required external components when used in conjunction with the Sanyo LA7430 and LA7435. In particular, ceramic filters and tank circuits are not required.
• Completely adjustment-free • Low power dissipation • Compact package
Package Dimensions
unit: mm 3098B-DIP10S
[LA7356]
unit: mm 3086A-MFP10S
[LA7356M]
SANYO: DIP10S
Specifications
Maximum Ratings at Ta = 25°C
Parameter Maximum supply voltage Allowable power dissipation Operating temperature Storage temperature
Symbol VCC max Pd max
Topr Tstg
Conditions Ta ≤ +65°C
SANYO: MFP10S
Ratings 7.0 120
–10 to +65 –40 to +125
Unit V
mW °C °C
SANYO Electric Co.,Ltd. Semiconductor Bussiness Headquarters
TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110-8534 JAPAN
33195TH (OT)/61594TH No. 4832-1/6
LA7356, 7356M
Operating Conditions at Ta = 25°C
Parameter Supply voltage Operating supply voltage range
Symbol VCC
VCC op
Conditions
Operating Characteristics at Ta = 25°C, VCC = 5 V
Parameter Quiescent current (1) Quiescent current (2) BGP threshold level
SYNC threshold level
Input limit amplifier gain Input limit amplifier limit level Comparator hysteresis voltage H Comparator hysteresis voltage L DET-OUT output voltage (H) DET-OUT output voltage (L)
Symbol
Conditions
ICC1 ICC2 BTH
STH
LIMG LIMD CompH CompL DETH DETL
Pin 5 = GND, Pin 7: input current, Output: T4
Pin 5 = VCC, Pin 7: input current, Output: T4 Slowly increase the DC voltage applied to pin 5 starting at 0 V. The pin 5 voltage input signal when a signal appears on pin 2 is 300 mV p-p. Output: T2
Slowly increase the DC voltage applied to pin 5 starting at 0 V. The pin 5 voltage input signal when a signal appears on pin 2 is 300 mV p-p. Output: T2
Defined as the output ratio when a 10 mVp-p amplitude sine wave is input to pin 1. Output: T2
Observe the output amplitude when a 300 mVp-p amplitude sine wave is input to pin 1. Output: T2
The V1 voltage when T1 goes from low to high when the voltage on V1 is gradually raised from 0 V. Output: T1
The V1 voltage when T1 goes from high to low when the voltage on V1 is gradually lowered from 5 V. Output: T1
With a 2 kΩ load resistance. Output: T1 With a 2 kΩ load resistance. Output: T1
Ratings 5.0
4.8 to 5.2
Unit V V
Ratings Unit
min typ max
7.0
10.0
13.0
mA
7.5
10.5
13.5
mA
2.2 2.5 2.8 V
0.6 0.8
9 12 150 190 2.7 3.0 2.0 2.3 3.6 4.0
0 0.2
1.0 V
15 dB 230 mVp-p 3.3 V 2.6 V 4.4 V 0.4 V
Switch Conditions
Symbol
ICC1 ICC2 BTH
Input signal
S1 S2
No signal
No signal
No signal
No signal
Sig. 1
No signal
STH LIMG LIMD
Comp H
No signal Sig. 1 Sig. 1
No signal
Sig. 1 No signal No signal
No signal
Comp L
DET H DET L
No signal
Sig. 2 Sig. 3
No signal
Sig. 1 Sig. 1
Input pulse S3 S4 0V 0V 5V 5V
0V 0V
0V 5V 5V
No signal
0V 0V 0V
No signal
No signal
P2 P2
No signal
P1 P1
Applied voltage V1 V2
DC, variable
DC, variable
DC, variable
DC, variable
SW1 OFF OFF ON
ON ON ON OFF
OFF OFF OFF
SW2 OFF OFF OFF
OFF OFF OFF ON
ON OFF OFF
Switch SW3 OFF OFF ON
ON OFF OFF OFF
OFF OFF OFF
SW4 OFF OFF OFF
OFF OFF OFF OFF
OFF OFF OFF
SW5 OFF OFF OFF
OFF OFF ON ON
ON ON ON
No. 4832-2/6
LA7356, 7356M Pin Assignment and Equivalent Circuit Block Diagram
Pin Functions
Pin No.
Symbol
1 CHROMA-IN
Equivalent I/O circuit
Unit (resistance: Ω, capacitance: F) Function
This is the chroma signal input pin. It can handle burst signals (an unmodulated carrier for SECAM signals) with an amplitude of between about 50 and 800 mV p-p.
2 HPF. MONI
3 FILTER 4 GND
HPF output monitor This pin should be connected to VCC in normal operation to avoid interference between pins 1 and 3.
Phase comparator output The output is smoothed with a capacitor. The smoothed output level will be 2.0 V or lower for PAL, and 3.5 V or higher for SECAM or MESECAM.
Continued on next page. No. 4832-3/6
Continued from preceding page.
Pin No.
Symbol
5 SYNC + BGP
LA7356, 7356M
Equivalent I/O circuit
Function
Input for the BGP + SYNC signal The input level is 1.0 to 2.0 V during the SYNC period ( ) and 3.0 to 4.5 V during the BGP period. Note that when used in conjunction with Sanyo LA7430 and LA7435 single-chip Y/C products, the external circuit connected to pin 5 is unnecessary since those single-chip circuits output a combine.