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 Multimedia ICs
Input selector switch for high definition displays
BA7658AFS
The BA7658AFS is an IC designed for high definition displays, and has an internal selector circuit for broadband RGB signals and HD / VD signals, a synchronization separator circuit, and a NUTEK signal detector circuit. This IC chip simplifies the configuration of input blocks for high-end displays.
*Applications HDTV, video board for personal computer, etc. CRT displays, *Features on a single 5V power supply. 1) Operates
2) Internal broadband RGB selector with a frequency characteristic of 230MHz ( - 3dB) 3) Internal HD / VD selector. 4) Internal separator for synchronization signal superimposed on the G signal. 5) Internal detector for NUTEK power saving signals.
*Absolute maximum ratings (Ta = 25C)
Parameter Power supply voltage Power dissipation Operating temperature Storage temperature Symbol VCC Pd Topr Tstg Limits 7.0 850 - 25 ~ + 75 - 55 ~ + 125 Unit V mW C C
Reduced by 8.5mW for each increase in Ta of 1C over 25C.
*Recommended operating conditions (Ta = 25C)
Parameter Power supply voltage Symbol VCC Min. 4.5 Typ. 5.0 Max. 5.5 Unit V
1
Multimedia ICs
BA7658AFS
*Block diagram
Blue 1 input
1
32
HD 1 input
Ground
2
1 2
31
HD 2 input
Green 1 input
3
1
30
HD output
Ground
4
2
29
Blue output
Red 1 input
5
28
Signal detector input
Ground
6
1
27
VCC
Blue 2 input
7
2
26
Green output
Ground
8 Signal DET
25
Composite video input (sync on green) Setting of time constant
Green 2 input
9
1
24
Ground
10
2
23 DET
Signal detector output
Red 2 input
11
22
Blanking pulse input
N.C.
12
Sync Sepa
21
N.C.
Ground
13
20
HD Sync signal detector
VD 1 input
14
2
1
19
Composite sync output
VD 2 input
15
Logic
18
Control
VD output
16
17
Red output
2
Multimedia ICs
BA7658AFS
*Pin descriptions
Pin No. Pin name 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 Function Pin No. 20 21 22 23 24 25 26 27 28 29 30 31 32 Pin name Function Blue 1 input B1 color signal input Ground GND HD Sync signal Synchronization signal detector detector N.C. N.C. Green 1 input G1 color signal input Ground GND
Blanking pulse Blanking pulse input input Signal detector Signal detector output output Setting of time Setting of time constant constant Composite video Composite video input input Green output G signal output VCC VCC
Red 1 input R1 color signal input Ground GND
Blue 2 input B2 color signal input Ground GND
Green 2 input G2 color signal input Ground GND
Red 2 input R2 color signal input N.C. Ground N.C. GND
Signal detector Signal detector input input Blue output HD output HD 2 input HD 1 input B signal output Horizontal synchronization signal HD output Horizontal synchronization signal HD2 input Horizontal synchronization signal HD1 input
VD 1 input Vertical synchronization signal VD1 input VD 2 input Vertical synchronization signal VD2 input VD output Vertical synchronization signal VD output
Red output R color signal output Control CTL (H = IN1, L = IN2)
Composite sync Synchronization signal output output
*Output selection setting table
CTL H L B IN1 IN2 G IN1 IN2 R IN1 IN2 HD IN1 IN2 VD IN1 IN2
3
Multimedia ICs
BA7658AFS
*Input / output circuits
R. G. B. input
VCC 50 6.8k
R. G. B. output
VCC
1, 3, 5 7, 9, 11pin
100
21k 1k 400 5mA
17, 26, 29pin
Control
VCC
35k
1k 18pin
50k
15k
Composite video input
VCC from DET out 25k
Composite sync output
VCC
Setting of time constant
VCC
25pin
100 25k 50A
19pin
24pin
4
Multimedia ICs
Signal detector output
VCC
BA7658AFS
Signal detector input
VCC
10k 100 23pin 28pin
7k
6k
F.F. 6k 6k
HD. VD input HD. VD input
VCC 2.7k 100
VCC
35k 1k 14, 15 31, 32pin 50k 15k 16, 30pin
HD sync signal detector
from HD out to sync sepa VCC
25k
670
20pin 25k
5
Multimedia ICs
BA7658AFS
*Electrical characteristics (unless otherwise noted, Ta = 25C, Vcc = 5.0V)
Parameter Quiescent current
Analog switches
Symbol ICC
Min. 26
Typ. 37
Max. 48
Unit mA
Conditions
Measurement circuit Fig. 1
Maximum output level Voltage gain Voltage gain differential (Input pin) Voltage gain differential (Block) Input pin crosstalk 1 Block crosstalk 1
Digital switches
Vom GV GVI GVB CTI1 CTB1
2.8 - 1.0 - 0.2 - 0.2 -- --
-- - 0.5 0 0 - 50 - 50
-- 0 0.2 0.2 - 40 - 40
VP-P dB dB dB dB dB
f = 1kHz f = 1MHz, VIN = 1VP-P f = 1MHz, VIN = 1VP-P f = 1MHz, VIN = 1VP-P f = 10MHz, VIN = 1VP-P f = 10MHz, VIN = 1VP-P
Fig. 1 Fig. 1 Fig. 1 Fig. 1 Fig. 2 Fig. 2
Input voltage "H" level Input voltage "L" level Input current "H" level Input current "L" level Rising time Falling time Rising delay time Falling delay time Output voltage "H" level Output voltage "L" level Output current "H" level Output current "L" level
SYNC separation unit
VIH VIL IIH IIL TR TF TRD TFD VOH VOL IOH IOL
1.8 -- 80 -3 -- -- -- -- 3.8 -- - 400 4
-- -- 100 -1 30 30 30 40 4.2 0.2 -- --
-- 1.2 130 -- 50 50 50 60 -- 0.4 -- --
V V A A ns ns ns ns V V A mA VIN = 5.0V VIN = 0V
Fig. 1 Fig. 1 Fig. 1 Fig. 1 Fig. 1 Fig. 1 Fig. 1 Fig. 1 Fig. 1 Fig. 1 Fig. 1 Fig. 1
Minimum SYNC separation level Output voltage "H" level Output voltage "L" level Output current "H" level Output current "L" level Rising time Falling time Rising delay time Falling delay time
VSMin. VOH VOL IOH IOL TR TF TRD TFD
-- 4.5 -- - 1.8 3.6 -- -- -- --
-- 4.8 0.2 -- -- 60 50 100 150
50 -- 0.5 -- -- 110 100 150 200
mVP-P V V mA mA ns ns ns ns
Fig. 1 Fig. 1 Fig. 1 Fig. 1 Fig. 1 Fig. 1 Fig. 1 Fig. 1 Fig. 1
6
Multimedia ICs
Parameter Signal detection block Minimum signal detection level Minimum signal detection time Blanking input Input voltage "H" level Input voltage "L" level Input current "H" level Input current "L" level Signal detection output Output voltage "H" level Output voltage "L" level Output current "L" level Pull-up resistance Control block Input voltage "H" level Input voltage "L" level Input current "H" level Input current "L" level VIH VIL VIH VIL 1.8 -- 80 -3 -- -- 100 -1 -- 1.2 130 -- V V A A VIN = 5.0V VIN = 0V VOH VOL IOL RL 4.5 -- 1.2 7 5.0 0.2 -- 10 -- 0.5 -- 13 V V mA k Io = 0 VIH VIL IIH IIL 3 -- -- -3 -- -- 120 0 -- 1.5 180 -- V V A A VIN = 5.0V VIN = 0V VDMin. TDMin. 320 -- 400 -- 480 30 mVP-P ns Symbol Min. Typ. Max. Unit Conditions
BA7658AFS
Measurement circuit
Fig. 1 Fig. 1
Fig. 1 Fig. 1 Fig. 1 Fig. 1
Fig. 1 Fig. 1 Fig. 1 Fig. 1
Fig. 1 Fig. 1 Fig. 1 Fig. 1
*Guaranteed design parameters (unless otherwise noted, Ta = 25C, Vcc = 5.0V)
Parameter Analog switch unit Frequency characteristics Input pin frequency characteristic deviation Block frequency characteristic deviation Input pin crosstalk 2 Block crosstalk 2 Gf GfI GfB CTIZ CTBZ -6 -1 -1 -- -- -3 0 0 - 30 - 30 -1 +1 +1 - 15 - 15 dB dB dB dB dB 1MHz / 230MHz, VIN = 1VP-P 1MHz / 100MHz, VIN = 1VP-P 1MHz / 230MHz, VIN = 1VP-P f = 230MHz, VIN = 1VP-P f = 230MHz, VIN = 1VP-P Fig. 2 Fig. 2 Fig. 2 Fig. 2 Fig. 2 Symbol Min. Typ. Max. Unit Conditions Measurement circuit
7
Multimedia ICs
BA7658AFS
*Measurement circuit
1.2V 5 1.8V 4 SW20 3
A
OSC5 75 5V A Oscilloscope
2 1 C1 C2 C1 C2
+ +
1 SW1 2 1 32 2 2 31 1 SW19 3 SW18 2 3 30 1
V V
Oscilloscope Spectrum Analyzer SW16 1 2 3
C1 C2 C1 C1 = 0.01F C2 = 47F C2
+
1 SW2 2
+
75 4 29 SW17 2 SW3 2 5 28 47F 1 SW4 2 0.01F 7 26 SW15 2 1 8 25 Oscilloscope 220k 5V SW5 2 9 24 4.7F 3 SW14 10 23 2 1 11 22 4 3V 3
A V A
+
C1 1 OSC1 75 2 3 SW7 4 5 6 C2 C1 C2
+ +
1F OSC4 1F 20A 75 1F OSC3 1F
1
+ +
C2 C1 C2
1 Vcc = 5V 3
A
6 C1
27
C1 C2 C1 C2
+ +
1
4
V
C1 C2 C1 C2
+ +
1 SW6 2
1.5V
1
A
N. C. 12
21 N. C. 470k
SW13 2 1
A
5V
5V
A
2 3 2 4 5 SW9 SW8 1 15 18 14 19 13 20
470pF
75 OSC5 1.8 1.2
Oscilloscope 3 SW12 2 1
V V
1
V
16
17 3
2 SW10
V
SW11 2 1
1.2V 1.8V
3 Oscilloscope
Fig. 1
8
Multimedia ICs
BA7658AFS
*Measurement circuit for frequency characteristics and crosstalk characteristics
C1 C2
+
1
Terminating resistor 2
C1 C2
+
3
Terminating resistor C1: 0.01F C2: 47F
270 4 29
Network Analyzer
C1 C2
+
5
Terminating resistor
6
27
+
VCC = 5V
0.01F C1 C2
+
47F
7
Terminating resistor 8 26
270
Network Analyzer
C1 C2
+
9
Terminating resistor 10 1.8V C1 C2
+
SW 11 18
1 1.2V 2
Terminating resistor 13
270 17
Network Analyzer
Fig. 2
9
Multimedia ICs
BA7658AFS
*Procedure for measurement of frequency characteristics and crosstalk characteristics
(1) Frequency characteristics 1 Use an oscilloscope to input a sine wave (VIN = 1.0VP-P, f = 1MHz / 150MHz) to the color signal input pins. Set the switch to 1 to select B1, G1 and R1, or to 2 to select B2, G2 and R2. Gf1 = Gv (f = 1MHz) - Gv (150MHz) [dB] (2) Frequency characteristic 2 Use an oscilloscope to input a sine wave (VIN = 1.0VP-P, f = 1MHz / 230MHz) to the color signal input pins. Set the switch to 1 to select B1, G1 and R1, or to 2 to select B2, G2 and R2. Gf1 = Gv (f = 1MHz) - Gv (250MHz) [dB] (3) Input pin crosstalk 1 Use an oscilloscope to input a sine wave (VIN = 1.0VP-P, f = 10MHz) to IN1. Connect IN2 to the ground through a capacitor. Set the switch to 2, input to IN2, then measure. CTI1 = 20log (VOUT / VIN) [dB] (4) Input pin crosstalk 2 Use an oscillator to input a sine wave (VIN = 1.0VP-P, f = 230MHz) to IN1. Connect IN2 to the ground through a capacitor. Set the switch to 2, input to IN2, then measure. CTI2 = 20log (VOUT / VIN) [dB] (5) Block crosstalk 1 Use an oscillator to input a sine wave (VIN = 1.0VP-P, f = 10MHz) to G1 and R1. Connect B1 to the ground through a capacitor. Set the switch to 1 and measure the B output. CTB1B = 20log (VOUTB / VING1) [dB] Similarly, CTB1G = 20log (VOUTG / VINR1) [dB] CTB1R = 20log (VOUTR / VINB1) [dB] (6) Block crosstalk 2 Use an oscillator to input a sine wave (VIN = 1.0VP-P, f = 230MHz) to G1 and R1. Connect B1 to the ground through a capacitor. Set the switch to 1 and measure the B output. CTB2B = 20log (VOUTB / VING1) [dB] Similarly, CTB2G = 20log (VOUTG / VINR1) [dB] CTB2R = 20log (VOUTR / VINB1) [dB]
10
Multimedia ICs
BA7658AFS
*Circuit operation (1) Analog switches
Switch between the two sets of R, G and B color signals. IN1 is selected by impressing the high level voltage on the CTL pin, IN2 by impressing the low level voltage. (2) Digital switches These switch between the two sets of HD and VD synchronization signals. HD and VD synchronization signals for IN1 are output by impressing the high level voltage on the CTL pin, HD and VD synchronization signals for IN2 by impressing the low level voltage. (3) Synchronization separation block Outputs the synchronization signals by separating them from composite signals (Sync on Green). When HD signals are being input, the synchronization signal detector stops the synchronization separator. The low
level voltage is output. The time that the synchronization separator is stopped can be set by changing the time constant attached to the synchronization signal detection pin. (4) Signal detection block When the signal input exceeds the level set inside the IC (typically 400mVP-P, VCC = 5.0V), the high level voltage is output to the color signal detection output pin. The low level voltage is output when the signal input is lower than the set level. The quiescent circuit reaction time can be set by changing the time constant attached to pin used to set the time constant for color signal detection. The signal detector stops while the high level is being input to the blanking pulse input pin, thereby preventing malfunctioning due setup signal block during the synchronization signal period.
The relationship between inputs and outputs
Input HD -- VD -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- Sync on Green HD -- VD -- -- -- Output Composite Sync
11
Multimedia ICs
BA7658AFS
*Application example
0.01F
+
1
32
IN1 B G R H V
47F / 6.3V 75 2
1 2
31
0.01F
+
3
30
HD OUT
47F / 6.3V 75
1
Ro 29 B OUT 1F 28 VCC 5V
4
2
0.01F
+
5
47F / 6.3V 75 6 0.01F
1
+
27 0.01F 26
2
+
47F / 6.3V G OUT
7
IN2 B G R H V
47F / 6.3V 75 8 0.01F
+
Ro 1F
25 Signal DET 24 4.7F
1
VCC 5V 220k
9
47F / 6.3V 75 10 0.01F
+
2
23 DET 22
Signal DET OUT Signal: H No Signal: L
11
47F / 6.3V 75 N. C. 12 Sync Sepa
Blanking pulse
21 N. C.
13
20 470k 470pF
14
2
1
19 Syncsepa out
15
Logic
18
CTL IN1: H IN2: L Ro R OUT
VD OUT
16
17
Fig. 3
12
Multimedia ICs
BA7658AFS
*Electrical characteristic curves
4 2 0 VOLTAGE GAIN: GV (dB) -2 -4 -6 -8 - 10 - 12 - 14 1M 10M FREQUENCY: f (Hz) 100M 300M CROSSTALK: CT (dB)
10 0 - 10 - 20 - 30 - 40 - 50 - 60 - 70 - 80 - 90 1M 10M FREQUENCY: f (Hz) 100M 300M
Fig. 4 Frequency characteristics
Fig. 5 Interchannel crosstalk characteristics
*Operation notes to the analog switch block output Resistors attached
Frequency characteristics of the analog switches vary according to the output load capacity. Set the attached resistor so that frequency characteristics remain flat. A too-large resistance will lower the characteristics peak.
*External dimensions (Units: mm)
13.6 0.2 32 7.8 0.3 5.4 0.2 17
1 1.8 0.1
16
0.11
0.8
0.36 0.1
0.3Min. 0.15
SSOP-A32
0.15 0.1
13


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