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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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