Sanyo LA7668N Specifications
Monolithic Linear IC
Ordering number : EN5097
61595HA (OT) No. 5097-1/11
SANYO Electric Co.,Ltd. Semiconductor Bussiness Headquarters
TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110-8534 JAPAN
Video Signal Auto-White Processing IC
LA7668N
Overview
The LA7668N is a low-cost video signal auto-white
processing IC that provides brightness adapted
compression and expansion functions. Furthermore, the
LA7668N incorporates on-chip a Sanyo developed
vertical line saturation suppression function for image
quality enhancement.
Features and Functions
• APL; frequency adaptive Y/C correction
• Vertical line saturation suppression function
• Correction circuit on/off function
• Built-in synchronization/burst gate separation circuit
• 4.0 V band gap Zener output
• Variable correction curve (using an external resistor)
Package Dimensions
unit: mm
3067-DIP24S
Specifications
Maximum Ratings at Ta = 25°C
Operating Conditions at Ta = 25°C
Electrical Characteristics at Ta = 25°C, VCC= 5.0 V
Parameter Symbol Conditions Ratings Unit
Maximum supply voltage V
CC
max 7.0 V
Allowable power dissipation Pd max Ta ≤ 65°C 200 mW
Operating temperature Topr –10 to +65 °C
Storage temperature Tstg –55 to +125 °C
Parameter Symbol Conditions Ratings Unit
Recommended supply voltage V
CC
5.0 V
Operating supply voltage range V
CC
op 4.5 to 5.5 V
Parameter Symbol Conditions min typ max Unit
Current drain (off) I
OFF
Pin 17 = 5 V, no input 16.0 20.0 25.0 mA
Current drain (on) I
ON
Pin 17 = 0 V, no input 18.0 22.0 28.0 mA
BGZ output 1 V
BGZ1IOUT
= 3 mA 3.7 4.0 4.3 V
BGZ output 2 V
BGZ2IOUT
= 3 mA, VCC= 4.5 V 3.65 4.0 4.3 V
BGZ maximum output current I
OMAXVCC
= 4.5 V 5.0 8.0 mA
Continued on next page.
[LA7668N]
SANYO: DIP24S
Continued from preceding page.
Pin Functions
No. 5097-2/11
LA7668N
Parameter Symbol Conditions min typ max Unit
[Luminance Signal System]
Voltage gain VG
Y
VIN= 1.0 Vp-p 6.0 6.5 7.0 dB
Frequency characteristics f
Y
When 3 dB down from the 1 MHz output level 7.0 8.5 MHz
Signal input level V
IY
1.0 1.2 Vp-p
Output DC level V
OYDC
Pedestal level 0.7 0.9 1.1 V
Pin 18 output V
18
1.75 2.0 2.25 V
γ characteristics 90 ∆
γ90
APL = 90%, VIN= 100 IRE 101 105 109 IRE
γ characteristics 50 ∆
γ50
APL = 50%, VIN= 40 IRE 41 45 49 IRE
γ characteristics 10-1 ∆
γ10-1
APL = 10%, VIN= 80 IRE 81 85 89 IRE
γ characteristics 10-2 ∆
γ10-2
APL = 10%, VIN= 40 IRE 43 47 52 IRE
[Chrominance Signal System]
Voltage gain VG
C
VIN= 0.66 Vp-p 6.3 6.8 7.2 dB
Maximum gain VG
MAX
When f = 3.58 MHz, APL = 0% 7.3 7.8 8.3 dB
Minimum gain VG
MIN
When f = 3.58 MHz, APL = 100% 5.7 6.2 6.7 dB
Frequency characteristics f
C
When 3 dB down from the 1 MHz output level 4.0 5.0 MHz
Signal input level V
IC
0.66 0.8 Vp-p
Output DC level V
OCDC
1.1 1.4 1.7 V
[Control System]
Mute on voltage V
ON
1.0 V
CC
V
Mute off voltage V
OFF
0 0.5 V
Pin 2 voltage V2 2.81 3.2 3.61 V
Pin 4 voltage V3 2.72 3.1 3.50 V
Pin 11 voltage V11 2.19 2.5 2.82 V
Pin 14 voltage V14 2.29 2.6 2.94 V
Pin 15 voltage V15 2.11 2.4 2.71 V
Pin 16 voltage V16 2.02 2.3 2.60 V
Pin 21 voltage V21 2.54 2.9 3.27 V
Pin 23 voltage V23 2.02 2.3 2.60 V
Pin No. Symbol Function
1 LPF
D
Correction signal frequency control
2 H
U
Correction reference voltage (3.2 V)
3 Y
IN
Luminance signal input
4 H
D
Correction reference voltage (3.1 V)
5 SYNC Sync separator input
6 V
CC
Power supply
7 BGP BGP delay time constant
8 APL
DET
APL level detection filter
9 HPF
IN
High-frequency detection filter (input)
10 HPF
OUT
High-frequency detection filter (output)
11 HE
DET
High-frequency detection circuit control voltage
12 C
IN
Chrominance signal input
13 C
OUT
Chrominance signal output
14 APL
H
APL discrimination reference voltage (high)
15 APL
L1
APL discrimination reference voltage (low)
16 APL
L2
APL discrimination reference voltage (for the high-frequency detection circuit)
17 MUTE Correction circuit muting
18 2.0VBIAS Luminance signal system bias
19 GND Ground
20 BGZ
OUT
4.0 V BGZ voltage output
21 L
D
Correction reference voltage (2.9 V)
22 Y
OUT
Luminance signal output
23 L
U
Correction reference voltage (2.3 V)
24 LPF
U
Correction signal frequency control
Application Circuit Diagram
No. 5097-3/11
LA7668N
Pin Descriptions
• Pins 1 and 24
Pins 1 and 24 are frequency control pins for the correction signal. If the capacitors C1 and C2 were not connected to pins
1 and 24, when correction was applied to signals that include noise as shown in the figure below, the noise level would
increase. Accordingly, the capacitors C1 and C2 are used to reduce the high frequencies so that high-frequency noise
levels are not aggravated. (frequency-adaptive type circuit)
C1 is provided for when the gain is increased, and C2 for when the gain is decreased. About 2 MHz when C = 82 pF.
No. 5097-4/11
LA7668N
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