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Ordering number : EN5693
Monolithic Linear IC
LA7642N
SECAM Format Color TV Chrominance Circuit
Overview
The LA7642N integrates the chrominance circuit for a SECAM format TV in a single 16-pin DIP (300 mil) package and provides an adjustment-free discriminator circuit. In combination with the Sanyo LA7687, LA7688, this IC can implement a multi-format color TV signalprocessing system.
Package Dimensions
unit: mm 3006B-DIP16
[LA7642N]
Features
* Adjustment-free discriminator circuit * On-chip bell filter
SANYO: DIP16
Specifications
Maximum Ratings at Ta = 25C
Parameter Maximum supply voltage Allowable power dissipation Operating temperature Storage temperature Symbol VCC max Pd max Topr Tstg Ta 65C Conditions Ratings 9 400 -10 to +65 -55 to +125 Unit V mW C C
Operating Conditions at Ta = 25C
Parameter Recommended operating voltage Operating voltage range Symbol VCC VCC op Conditions Ratings 7.8 7.0 to 8.5 Unit V V
Operating Characteristics at Ta = 25C, VCC = 7.8 V, with pin 13 pulled up to VCC through a 20-k resistor
Parameter [Circuit Voltage and Current] Circuit current [Filter Block] Input impedance The pin 14 input impedance. For reference only (design value) 15 k ICC Chrominance system. Measure the current flowing into pin 15; With no signal applied to pin 14. 28 35 42 mA Symbol Conditions Ratings min typ max Unit
Continued on next page.
SANYO Electric Co.,Ltd. Semiconductor Bussiness Headquarters
TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110 JAPAN
73097HA(OT) No. 5693-1/6
LA7642N
Continued from preceding page.
Parameter Symbol Conditions Ratings min typ max Unit
Bell filter frequency characteristics 4.086 MHz
Referenced to 4.286 MHz. For reference only. EQU = off. Input a 20 mV p-p, f = 4.286 MHz CW signal to pin 14 and, measure the pin 16 output BEL4.086 (f = 4.286 MHz). Next, input a CW of 20 mV p-p, f = 4.086 MHz and measure the pin 16 output (f = 4.086 MHz) and calculate the frequency characteristics. Referenced to 4.286 MHz. For reference only. EQU = off. Input a 20 mV p-p, f = 4.286 MHz CW signal to pin 14 and, measure the pin 16 output BEL4.486 (f = 4.286 MHz). Next, input a CW of 20 mV p-p, f = 4.486 MHz and measure the pin 16 output (f = 4.486 MHz) and calculate the frequency characteristics. Referenced to 4.286 MHz. For reference only. EQU = on. Input a 20 mV p-p, f = 4.286 MHz CW signal to pin 14 and, measure the pin 16 output EQU4.086 (f = 4.286 MHz). Next, input a CW of 20 mV p-p, f = 4.086 MHz and measure the pin 16 output (f = 4.086 MHz) and calculate the frequency characteristics. Referenced to 4.286 MHz. For reference only. EQU = on. Input a 20 mV p-p, f = 4.286 MHz CW signal to pin 14 and measure the pin 16 output EQU4.486 (f = 4.286 MHz). Next, input a CW of 20 mV p-p, f = 4.486 MHz and measure the pin 16 output (f = 4.486 MHz) and calculate the frequency characteristics. Referenced to 4.35 MHz. For reference only. EQU = off. Input a 20 mV p-p CW signal to pin 14 and modify the frequency of that signal. Measure the deviation from 4.35 MHz of the frequency (the center frequency) for which the pin 16 output is maximized. Referenced to 4.35 MHz. For reference only. EQU = off. Measure the gain at the BELF0 500 kHz, and calculate the difference.
-9
-6
-3
dB
Bell filter frequency characteristics 4.486 MHz
-5
-2
-0.5
dB
EQU frequency characteristics 4.086 MHz
-10.5
-7.5
-4.5
dB
EQU frequency characteristics 4.486 MHz
-3
0
+3
dB
Bell filter frequency deviation from center frequency
BELF0
-50
0
+50
kHz
Bell filter gain difference at f0 500 kHz
BELdG
-1
0
+1
dB
[Chrominance Block] Let 0 dB = 200 mV p-p. Input a color bar signal to pin 14 and gradually lower the input signal level. Measure the input level at the point the pin 13 DC voltage falls below 1/2* VCC. The pin 7 B-Y amplitude for a color bar signal. Let 0 dB = 200 mV p-p. Input a color bar signal (0 dB) to pin 14, and measure the B-Y amplitude at pin 7. The pin 6 R-Y amplitude for a color bar signal. Let 0 dB = 200 mV p-p. Input a color bar signal (0 dB) to pin 14, and measure the R-Y amplitude at pin 6. VRY/VBY. Calculate the ratio of the values measured above. RATRB = VRY/VBY Input a color bar signal (0 dB) to pin 14. In the pin 7 (B-Y) output waveform measure the amplitude of the blue (+230 kHz) and yellow (-230 kHz) components (A) and measure the amplitude of the blue green (+78 kHz) and red (-78 kHz) components (B). Calculate the value of LINBY from the following formula. LINBY = (A/B) x (156/460) x 100 (%)
Killer operating point
KILL
-42
-36
-33
dB
B-Y output amplitude
VBY
0.60
0.75
0.90
Vp-p
R-Y output amplitude
VRY
0.74
0.92
1.10
Vp-p
R-Y/B-Y output ratio
RATRB
1.1
1.23
1.35
B-Y linearity
LINBY
85
100
115
%
Continued on next page. No. 5693-2/6
LA7642N
Continued from preceding page.
Parameter Symbol Conditions Input a color bar signal (0 dB) to pin 14. In the pin 6 (R-Y) output waveform measure the amplitude of the blue green (+280 kHz) and red (-280 kHz) components (A) and measure the amplitude of the blue (+45 kHz) and yellow (-45 kHz) components (B). Calculate the value of LINRY from the following formula. LINRY = (A/B) x (90/560) x 100 (%) Measure the peak value of the pin 7 ALC pulse signal. Referenced to the blanking period DC level. The pin 7 blanking period DC level. The pin 6 blanking period DC level. The pin 7 output impedance. For reference only. Input a color bar signal (0 dB) to pin 14 and measure the pin 7 B-Y amplitude Vb (V p-p). Next, connect a 2-k resistor between pin 7 and ground and measure the pin 7 B-Y amplitude Vwrb (V p-p). Derive ZBYS from the following formula. ZBYS = (Vb - Vwrb)/Vwrb x 2k (). The pin 6 output impedance. For reference only. Input a color bar signal (0 dB) to pin 14 and measure the pin 6 R-Y amplitude Vr (V p-p). Next, connect a 2-k resistor between pin 6 and ground and measure the pin 6 R-Y amplitude Vwrr (V p-p). Derive ZRYS from the following formula. ZRYS = (Vr - Vwrr)/Vwrr x 2k (). The pin 7 output impedance. For reference only. Apply a 4-V signal to pin 7 (B-Y), measure the influx current Ib, and derive ZBY from the following formula. ZBY = 4/Ib (M) The pin 6 output impedance. For reference only. Apply a 4-V signal to pin 6 (R-Y), measure the influx current Ir, and derive ZRY from the following formula. ZRY = 4/Ir (M) The DC difference between the pin 7 no signal period DC level and the signal period DC level for a black-and-white signal. Measure DBY (V) and calculate BBBY from the following formula. BBBY = DBY x 460/VBY kHz The DC difference between the pin 6 no signal period DC level and the signal period DC level for a black-and-white signal. Measure DRY (V) and calculate BBRY from the following formula. BBRY = DRY x 460/VRY kHz Input a signal to which a 63-kHz modulation has been applied to pin 14 and measure the pin 7 B-Y amplitude Vbon (V p-p) when preemphasis is on. Next, turn off preemphasis, measure the pin 7 B-Y amplitude Vboff (V p-p), and calculate DE63B from the following formula. DE63B = 20 x log (Vboff/Vbon) (dB) Ratings min typ max Unit
R-Y linearity
LINRY
85
100
115
%
ALC pulse height Blanking period B-Y DC voltage Blanking period R-Y DC voltage
VALC VALC VRYBLK
180 3.8 3.8
200 4.1 4.1
220 4.4 4.4
mVp-p V V
SECAM output impedance: B-Y
ZBYS
150
SECAM output impedance: R-Y
ZRYS
150
Output impedance Non-SECAM: B-Y
ZBY
10
M
Output impedance Non-SECAM: R-Y
ZRY
10
M
Black level error B-Y
BBBY
-5
0
+5
kHz
Black level error R-Y
BBRY
-5
0
+5
kHz
[De-Emphasis Characteristics]
De-emphasis 63k B-Y
DE63B
-1.0
-2.6
-4.0
dB
Continued on next page.
No. 5693-3/6
LA7642N
Continued from preceding page.
Parameter Symbol Conditions Input a signal to which a 63-kHz modulation has been applied to pin 14 and measure the pin 6 R-Y amplitude Vron (V p-p) when preemphasis is on. Next, turn off preemphasis, measure the pin 6 R-Y amplitude Vroff (V p-p), and calculate DE63R from the following formula. DE63R = 20 x log (Vroff/Vron) (dB) Input a signal to which a 250-kHz modulation has been applied to pin 14 and measure the pin 7 B-Y amplitude Vbon (V p-p) when preemphasis is on. Next, turn off preemphasis, measure the pin 7 B-Y amplitude Vboff (V p-p), and calculate DE250B from the following formula. DE250B = 20 x log (Vboff/Vbon) (dB) Input a signal to which a 250-kHz modulation has been applied to pin 14 and measure the pin 6 R-Y amplitude Vron (V p-p) when preemphasis is on. Next, turn off preemphasis, measure the pin 6 R-Y amplitude Vroff (V p-p), and calculate DE250R from the following formula. DE250R = 20 x log (Vroff/Vron) (dB) Apply at least 16 pulses with an amplitude of 0 V to VCC and then take the following measurement. Apply a DC voltage to pin 10 and slowly increase this voltage starting at 0 V. Measure the DC voltage applied to pin at the point the pin 3 DC voltage exceeds 3 V. Apply at least 16 pulses with an amplitude of 0 V to VCC and then take the following measurement. Apply a pulse signal with a 12-s high period and a 52-s low period (for a 64-s cycle) and slowly increase the amplitude of that signal starting at 0. Measure the wave height of that pulse signal at the point the pin 7 (B-Y) DC voltage exceeds VBYBLK + 100 mV. Apply at least 16 pulses with an amplitude of 0 V to VCC and then take the following measurement. Apply a pulse signal with a 12-s high period and a 52-s low period (for a 64-s cycle) and slowly increase the amplitude of that signal starting at 0. Measure the wave height of that pulse signal at the point the pin 4 (IDF) DC voltage becomes higher than it was at the point the pulse signal wave height was 0. Ratings min typ max Unit
De-emphasis 63k R-Y
DE63R
-1.0
-2.6
-4.0
dB
De-emphasis 250k B-Y
DE250B
-4.5
-7.0
-9.5
dB
De-emphasis 250k R-Y
DE250R
-6.5
-9.0
-11.5
dB
[Sandcastle Pulse]
V threshold voltage
VBLK
1.0
1.3
1.6
V
H threshold voltage
HBLK
2.5
3.0
3.5
V
BGP threshold voltage
BGP
4.5
5.0
5.5
V
[System Switching] SECAM threshold voltage 1 Slowly increase the pin 12 DC voltage from SESWLO 0 V and measure that voltage at the point the mode switches to a non-SECAM mode. SESWHI Slowly increase the pin 12 DC voltage from 3 V and measure that voltage at the point the mode switches to SECAM mode. 1.0 1.3 1.6 V
SECAM threshold voltage 2 [Killer Output: Pin 13] Killer on output level Killer off output level [Reference Frequency Input Block] 4.00-MHz input level variations 1
3.6
3.9
4.3
V
VKILON VKILOF
Measure the pin 13 voltage when the killer circuit is on. Measure the pin 13 voltage when the killer circuit is off.
0.0 7.3
0.2 7.8
0.5 7.8
V V
V5DS4
Measure the variation in the pin 5 DC voltage when the 4.00-MHz input level is changed from 200 mV p-p to 100 mV p-p.
-50
0
+50
mV
No. 5693-4/6
LA7642N
Continued from preceding page.
Parameter Symbol Conditions Measure the variation in the pin 5 DC voltage when the 4.00-MHz input level is changed from 200 mV p-p to 300 mV p-p. Measure the variation in the pin 3 DC voltage when the 4.43-MHz input level is changed from 200 mV p-p to 100 mV p-p. Measure the variation in the pin 3 DC voltage when the 4.43-MHz input level is changed from 200 mV p-p to 300 mV p-p. The pin 9 input impedance. For reference only (design value) The pin 11 input impedance. For reference only (design value) Ratings min -50 typ 0 max +50 Unit
4.00-MHz input level variations 2
V5DB4
mV
4.43-MHz input level variations 1
V3DS44
-50
0
+50
mV
4.43-MHz input level variations 2
V3DB44
-50
0
+50
mV
4.00-MHz input impedance 4.43-MHz input impedance [VCC Dependency]
Z9 Z11
15 15
k k
ALC pulse wave height
dVALC
The percentage change in the ALC pulse peak value when VCC changes by 1 V. Measure the ALC pulse peak value when VCC = 9 V and record this value as VALC9. Calculate dVALC from the following formula. (VALC9 - VALC)/1.2/VALC x 100 (%)
10
15
20
%
Notes: EQU = off: Pull pin 16 to ground through a 4.7-k resistor. EQU = on: Leave pin 16 open.
Block Diagram
No. 5693-5/6
LA7642N
s No products described or contained herein are intended for use in surgical implants, life-support systems, aerospace equipment, nuclear power control systems, vehicles, disaster/crime-prevention equipment and the like, the failure of which may directly or indirectly cause injury, death or property loss. s Anyone purchasing any products described or contained herein for an above-mentioned use shall: Accept full responsibility and indemnify and defend SANYO ELECTRIC CO., LTD., its affiliates, subsidiaries and distributors and all their officers and employees, jointly and severally, against any and all claims and litigation and all damages, cost and expenses associated with such use: Not impose any responsibility for any fault or negligence which may be cited in any such claim or litigation on SANYO ELECTRIC CO., LTD., its affiliates, subsidiaries and distributors or any of their officers and employees jointly or severally. s Information (including circuit diagrams and circuit parameters) herein is for example only; it is not guaranteed for volume production. SANYO believes information herein is accurate and reliable, but no guarantees are made or implied regarding its use or any infringements of intellectual property rights or other rights of third parties. This catalog provides information as of July, 1997. Specifications and information herein are subject to change without notice. No. 5693-6/6

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