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TECHNICAL NOTE
High-performance Video Signal Switchers
Single Circuit Video Signal Switcher
BA7654F, BA7653AF/AFV ,BA7652AF
Description The BA7654F, BA7653AF/AFV, or BA7652AF is a video signal (display signal) switch containing one 2-input or 3-input circuit. Each of the input pin formats is "sync-tip clamp input" that matches the synchronous tips of video signals (display signals) to the same potential. The inputs have an high input impedance configuration, in which they can utilize a small clamp capacitor (0.01 F (FZ) ceramic capacitor is recommended).
Features 1) Low value clamp capacitance can be used (Min. 3000 pF Recommended 0.01 F (FZ) ceramic capacitor) 2) Low voltage operation is possible (Operating range 4.0 7.0V) 3) Superimposed can be applied since switching speed of SW is fast and there is little switching noise (Typ. 70ns) 4) Low power consumption (Typ. 25mW when Vcc=5V) 5) Large dynamic range (Typ. 3.1VP-P when Vcc=5V) 6) Good frequency characteristics (Typ. 10 MHz 0 dB) 7) Low interchannel crosstalk (Typ. -70 dB) 8) Voltage can be applied to the CTL pin without a VCC voltage. 9) Built-in mute function (BA7652AF)
Applications VCR, TV, and other applications that use display signals.
Product lineup Part No. BA7654F BA7653AF/AFV BA7652AF Input type 2 in 1 Circuit 3 in 1 Circuit 3 in 1 Circuit Mute Supply voltage(V) 4.0 7.0
Aug.2008
Absolute maximum ratings Ta=25 Limits BA7653AF BA7653AFV 9
Parameter Supply voltage
Symbol VCC
BA7654F
BA7652AF
Unit V
Power dissipation Pd 500*1 500*1 350*2 500*1 mW Operating temperature Topr -25 +75 -30 +80 -30 +80 -30 +80 Storage temperature Tstg -55 +125 *1 Reduce by 5.0mW/qC over 25qC, when mounted on a 50mm50mm PCB board.(BA7654F, BA7653AF, BA7652AF) 2 * Reduce by 3.5mW/qC over 25qC, when mounted on a 50mm50mm PCB board.(BA7653AFV)
Operating range Ta=25 Parameter Symbol Limits Unit V
Supply voltage VCC 4.0 7.0 Note: This IC is not designed to be radiation-resistant.
Electrical characteristics
Unless otherwise noted, Symbol ICC Vom GV Cta Cf VTH L VTH H Min. 2.7 2.6 -0.5 -3.0 2.5
Ta=25 , Vcc=5.0V Typ. 5.0 3.1 0 -70 0 Max. 8.2 +0.5 +1.0 1.0 Unit mA VP-P dB dB dB V Conditions f=1kHz, THD=1.0 f=1MHz, VIN=1.0VP-P f=4.43MHz, VIN=1.0VP-P f=10MHz/1MHz, VIN=1.0VP-P VTH = Vcc-0.75 0.44
Parameter Circuit current Maximum output level Voltage gain Inter channel crosstalk Frequency characteristics CTL switching voltage
Guaranteed design parameters (Unless otherwise noted, Ta=25 , Vcc=5.0V Parameter Differential phase Differential gain Symbol DG DP Min. Typ. 0 0.5 Max. 0.5 1.0 Unit deg Conditions VIN=1.0VP-P, standard staircase signal VIN=1.0VP-P, standard staircase signal
2/8
Block diagram
IN1
1
8
GND
CTL
2
7
OUT
IN2
3 Logic
6
VCC
GND
4
5
Open.
Fig.1
BA7654F
Fig.2
BA7653AF/AFV
Fig.3
BA7652AF
Control Pin Settings BA7654F CTL L H OUT IN1 IN2 CTLa L H L H BA7653AF/AFV CTLb L L H H OUT IN1 IN2 IN3 IN3 CTLa L H L H BA7652AF CTLb L L H H OUT IN1 IN2 IN3 MUTE
3/8
Pin descriptions 1/2 (BA7654F)
BA7654F Pin No. Pin name DC voltage Vcc=5V Input/output impedance Equivalent circuit
1 (3)
IN1 1.65V (IN2) 10M or more
IN1 (IN2)
2
CTL
CTL
4 GND (8) 0V
5
N.C.
open
open
6
Vcc
5V
7
OUT
0.95V
26
4/8
Pin descriptions 2/2 (BA7653AF/53AFV/52AF)
BA7653AF/53AFV/52AF Pin No. Pin name DC voltage Vcc=5V Input/output impedance Equivalent circuit
1 (3) (5)
IN1 (IN2) (IN3)
1.65V
10M
or more
IN1 (IN2) (IN3)
2
CTLa
CTLa
4
CTLb
6
Vcc
5.0V
7
OUT
0.95V
26
8
GND
0V
5/8
Application circuit 1/2
BA7654F
BA7654F BA7654F
0.01 0.01uF C.Video IN C.Video IN 1 1 IN 1 IN1 Vcc Vcc 6 6
Vcc Vcc
0.01 0.01uF C.Video IN C.Video IN IN 2 3 3 IN2
47 47uF
0.1 0.1u
Open 5 5 Open
OUT OUT
7 7
C.Video OUT C.Video OUT
Logic Logic
2 2
CTL CTL
4 4
GND GND
GND GND
8 8
Fig.4 When superimpossion is used
BA7654F
0.01uF C.Video IN 1 IN1 Vcc 6 Vcc
47u 3
DC1.7V or more
0.1u
IN2
5
Open
OUT
7
C.Video OUT/DC OUT
Logic
2
CTL
4
GND
GND 8
Fig.5 Cautions on use 1. 2. Numbers and data in entries are representative design values and are not guaranteed values of the items. Although ROHM is confident that the example application circuit reflects the best possible recommendations, be sure to verify circuit characteristics for your particular application. Modification of constants for other externally connected circuits may cause variations in both static and transient characteristics for external components as well as this Rohm IC. Allow for sufficient margins when determining circuit constants. Absolute maximum ratings Use of the IC in excess of absolute maximum ratings, such as the applied voltage or operating temperature range (Topr), may result in IC damage. Assumptions should not be made regarding the state of the IC (short mode or open mode) when such damage is suffered. A physical safety measure, such as a fuse, should be implemented when using the IC at times where the absolute maximum ratings may be exceeded. GND potential Ensure a minimum GND pin potential in all operating conditions. Make sure that no pins are at a voltage below the GND at any time, regardless of whether it is a transient signal or not. Thermal design Perform thermal design, in which there are adequate margins, by taking into account the permissible dissipation (Pd) in actual states of use. Short circuit between terminals and erroneous mounting Pay attention to the assembly direction of the ICs. Wrong mounting direction or shorts between terminals, GND, or other components on the circuits, can damage the IC. Operation in strong electromagnetic field Using the ICs in a strong electromagnetic field can cause operation malfunction. For clamp operation stability Set the output impedance of the stage before a BA7654AF input pin no more than 1 k.
3.
4.
5.
6.
7. 8.
6/8
An input clamp capacitor will cause delay in operation at power on. Therefore, it is recommended to use a clamp capacitor no larger than 0.1 F ( A 0.01 F (FZ) ceramic capacitor is recommended). 10. CTL pin is in indeterminate status when left Open. Set it at "H" or "L" level. 11. For superimposed, a 1.7v DC voltage should be applied directly to an input pin. Application circuit 2/2 BA7653AF/53AFV/52AF BA7653AF/53AFV/52AF
9.
Fig.6 When superimpossion is used BA7653AF/53AFV/52AF
DC1.7V or more
DC1.7V
or
Fig.7 Cautions on use 1. 2. Numbers and data in entries are representative design values and are not guaranteed values of the items. Although ROHM is confident that the example application circuit reflects the best possible recommendations, be sure to verify circuit characteristics for your particular application. Modification of constants for other externally connected circuits may cause variations in both static and transient characteristics for external components as well as this Rohm IC. Allow for sufficient margins when determining circuit constants. Absolute maximum ratings Use of the IC in excess of absolute maximum ratings, such as the applied voltage or operating temperature range (Topr), may result in IC damage. Assumptions should not be made regarding the state of the IC (short mode or open mode) when such damage is suffered. A physical safety measure, such as a fuse, should be implemented when using the IC at times where the absolute maximum ratings may be exceeded. GND potential Ensure a minimum GND pin potential in all operating conditions. Make sure that no pins are at a voltage below the GND at any time, regardless of whether it is a transient signal or not. Thermal design Perform thermal design, in which there are adequate margins, by taking into account the permissible dissipation (Pd) in actual states of use. Short circuit between terminals and erroneous mounting Pay attention to the assembly direction of the ICs. Wrong mounting direction or shorts between terminals, GND, or other components on the circuits, can damage the IC. Operation in strong electromagnetic field Using the ICs in a strong electromagnetic field can cause operation malfunction. For clamp operation stability Set the output impedance of the stage before a BA7653AF/53AFV/52AF input pin no more than 1 k. An input clamp capacitor will cause delay in operation at power on. Therefore, it is recommended to use a clamp capacitor no larger than 0.1 F ( A 0.01 F (FZ) ceramic capacitor is recommended). 7/8
3.
4.
5.
6.
7. 8. 9.
10. The BA7653AF/53AFV/52AF is a 3-input, 1-output switch. If it is used as a 2-input, 1-output switch, by leaving one input Open and unused, the Open input pin will oscillate. However, this does not affect other pins and is not particularly a problem for operation. If necessary, connect the input pin to GND via a capacitor or connect the input pin directly to VCC to stop oscillation. 11. CTL pin is in indeterminate status when left Open. Set it at "H" or "L" level. 12. For superimposed, a 1.7v DC voltage should be applied directly to an input pin.
7
6
5
Part No.
4
2
Tape and Reel information
BA7654F BA7653AF/AFV BA7652AF
SOP8

Tape Quantity
5.00.2
8 5
Embossed carrier tape 2500pcs E2
(The direction is the 1pin of product is at the upper left when you hold reel on the left hand and you pull out the tape on the right hand)
6.20.3 4.40.2
1
4
0.150.1 0.1
1.50.1 0.11
1.27 0.40.1
0.3Min.
Direction of feed
1234
(Unit:mm)
Reel
1234
1234
1Pin
When you order , please order in times the amount of package quantity.
1234
1234
1234
1234
1234
SSOP-B8

Tape Quantity
3.00.2
8 5
Embossed carrier tape 2500pcs E2
(The direction is the 1pin of product is at the upper left when you hold reel on the left hand and you pull out the tape on the right hand)
6.40.3 4.40.2
1
4
0.150.1 0.1
1.150.1 0.1
0.3Min.
Direction of feed
1234
1234
1234
1234
1234
1234
1234
1234
0.220.1 0.65
(0.52)
Reel
1Pin
When you order , please order in times the amount of package quantity.
8/8
Catalog No.08T298A '08.8 ROHM

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