BD3825FS

TECHNICAL NOTE Video/Audio Interfaces for TV and DVD Recorders PAL Audio I/O Interface BD3825FS Description BD3825FS is an audio signal switch IC used for PAL DVD-Recorders. BD3825FS supports six input lines which are 2 controlled by the I C-BUS of video signal LSI BH7624KS2. In addition, BD3825FS has two built-in Function Switch features. Features 1) Vcc = ±5V (for Audio signal), +12V (for Function SW) Audio SW (C-MOS analog switch configuration) 2) 3 inputs - 1output SW, (2 circuits built-in with MUTE function) 3) 2 inputs - 1output SW, (2 circuits built-in with MUTE function) 4) THD (typ.) = 0.007% 5) S/N (typ.) = 90dB 6) Crosstalk (typ.) = 90dB 7) ON resistance (max.) = 300 8) 2 Function Switch outputs Applications DVD-Recorder, STB, etc. Absolute maximum ratings Ta=25°C Parameter Power Supply Voltage1 Power Supply Voltage2 Power Dissipation Operating Temperature Range Storage Temperature Range *1 Reduced by 9 mW/ C over 25 C. Operating range (Ta=25°C) Parameter Supply voltage1 Supply voltage2 Symbol Vcc1 Vcc2 Limits 4.5 5.5 Unit V V Symbol V1 V2 Pd Topr Tstg Limits 6.0 13.5 800 -25 -55 *1 +75 +125 Unit V V mW °C °C 11.5 12.5 Note: This IC is not designed to be radiation-resistant. Ver.B Oct.2005 Electrical characteristics (Unless otherwise specified, Vcc1=±5.0V, Vcc2=12V, Ta=25°C) Limit Item Symbol MIN. whole TYP. MAX. Unit Conditions Circuit Current 1 IATYP1 2.5 5.0 7.5 mA Vcc1=±5V Circuit Current 2 IATYP2 5.0 10.0 15.0 mA Vcc2=12V AUX, L1_R,L OUT Vin=2Vrms, f=20Hz/100kHz RL=47k Vin=2.2Vrms, f=1kHz RL=47k Vin=2Vrms, f=1kHz No Filter Vin=0V Vin=2Vrms, f=1kHz RL=47k Vin=2Vrms, f=1kHz Frequency Characteristic FFC -1.0 0.0 1.0 dB Distortion FDIS - 0.007 0.1 % S/N FSN 80 90 - dB ON Resistance RON - 200 300 MUTE Attenuation FMUTE - -80 -75 dB ASW1 SW Crosstalk FSWCRS1 - -90 -85 dB ASW2 SW Crosstalk Between crosstalk channel (AUX_L ch R ch) Between crosstalk channel (L1_L ch R ch) FS_AUX,FS_L1 output voltage H FSWCRS2 - -90 -85 dB Vin=2Vrms, f=1kHz FCHCRS1 - -90 -85 dB Vin=2Vrms, f=1kHz FCHCRS2 - -90 -85 dB Vin=2Vrms, f=1kHz VFSOH 10.0 11.0 12.0 V RL=10k FS_AUX,FS_L1 output voltage M VFSOM 5 5.75 6.5 V RL =10k FS_AUX,FS_L1 output voltage L VFSOL 0 0 1.5 V RL =10k ASW1,2,3,4 input voltage H VASWH 2.0 - +Vcc1 V ASW1,2,3,4 input voltage L VASWL 0 - 1.0 V FS_AUX, FS_L1 input voltage H VFSIH 3.9 - +Vcc1 V FS_AUX, FS_L1 input voltage M VFSIM 1.65 - 3.1 V FS_AUX, FS_L1 input voltage L VFSIL 0 - 0.85 V 2/8 Block diagram TU_Lch DA_Lch L1_Lch MUTE TU_Rch DA_Rch L1_Rch MUTE 1 2 3 4 1 2 3 4 SW1 TU/DA/L1 DA_Lch AUX_Lch MUTE DA_Rch AUX_Rch MUTE 1 2 3 1 2 3 SW2 DA/AUX FS_L1 OUT H M L 12V 6.7V FS_AUX OUT H M L 12V 6.7V -5V +5V +12V Fig.1 Block Diagram 3/8 Equivalent circuit PIN NO. Pin name IN OUT Referance Voltage Equivalent Circuit Function 200K SW control signal input terminal At Input open, input becomes “H” due to the pull up resistance. Input impedance is 200k SW control signal input terminal 1 7 ASW1 ASW4 Threshold 1.0 2.0V 30K 2 6 ASW2 ASW3 Threshold 1.0 2.0V 200K At input open, input becomes “L” due to the pull down resistance. Input Impedance is 200k . 3 11 13 4 5 8 9 15 17 21 23 +5V -5V +12V TU_R_IN TU_L_IN DA_R_IN DA_L_IN AUX_R_IN AUX_L_IN L1_R_IN L1_L_IN 5V -5V 12V Power supply terminal 50 Audio signal input terminal The audio signal input terminal is connected to the analog switch inside. Threshold 10 12 FS_L1_IN FS_AUX_IN 3.1 3.9V 0.85 1.65V FS control signal input terminal It has two threshold voltages. At input open, it becomes “L” input due to the pull down resistance. Input impedance is 200k 14 16 20 22 AUX_R_OUT AUX_L_OUT L1_R_OUT L1_L_OUT 50 Audio signal output terminal A chosen audio signal can be outputted using the input transfer switch. FS output terminal H:11.0V 18 24 FS_AUX_OUT M:5.75V FS_L1_OUT L:0V 12V FS output circuit has 3 6.7V output states H, M & L. Load resistance above 10k is used. Output becomes HiZ at “L” selection. 19 GND 0V GND terminal 4/8 Description of operations SW1, SW2 2 Audio input is controlled by I C-BUS of BH7624KS2. FS_L1_OUT, FS_AUX_OUT The 3 states signal (HI, MID, LOW) of the 5V standard is input into FS_L1_IN (10pin), FS_AUX_IN (12pin). Then FS_L1_OUT (24pin), FS_AUX_OUT (18pin) output standard signal of the 12V. This output becomes a Function Switch of the scart connector. SW Control truth table SW1 ASW1 L L H H ASW2 L H L H AUX_L_OUT TU_L_IN DA_L_IN L1_L_IN MUTE AUX_R_OUT TU_R_IN DA_R_IN L1_R_IN MUTE SW2 ASW3 L L H H ASW4 L H L H L1_L_OUT DA_L_IN AUX_L_IN MUTE MUTE L1_R_OUT DA_R_IN AUX_R_IN MUTE MUTE At power Activation ASW1 : H ASW2 : L ASW3 : L ASW4 : H 5/8 Application circuit ASW1 FS_L1_OUT 1 FS_L1 OUT +5V ASW2 H M L 12V 6.7V 24 FS_L1_OUT 10k L1_L_IN 2 ASW1 23 L1_L_IN 23 BH7624KS2 ASW2 +5V L1_L_OUT 21 ASW3 +5V 0.1u 47u 3 22 L1_L_OUT 47k 17 ASW4 TU_R_IN L1_R_IN 15 FSL1 TU_R_IN 4 21 L1_R_IN 5 FSAUX TU_L_IN L1_R_OUT 3 TU_L_IN 5 FS_AUX OUT ASW3 12V 20 L1_R_OUT 47k GND H M L 6.7V 6 19 GND ASW4 FS_AUX_OUT 7 18 FS_AUX_OUT 10k DA_R_IN AUX_L_IN DA_R_IN 8 17 AUX_L_IN DA_L_IN AUX_L_OUT DA_L_IN 9 16 AUX_L_OUT 47k FS_L1_IN AUX_R_IN 10 15 AUX_R_IN -5V AUX_R_OUT -5V 0.1u 47u 11 14 AUX_R_OUT 47k FS_AUX_IN +12V 12 13 0.1u 47u +12V Fig.2 2 ASW1, 2, 3, 4, FS_L1_IN, FS_AUX_IN are controlled by I C-BUS of BH7624KS2. Reference data 4.5 12 10 CIRCUIT CURRENT : I C1[mA] C CIRCUIT CURRENT:I C2[mA] C 4.4 10 0 GAIN 5.6V 4.4V 4.2 6 PHASE -20 5.6V 4.1 4 -30 5.0V 4.4V 4 2 -40 3.9 -50 0 50 100 0 -50 0 50 100 TEMPERATURE [ ] TEMPERATURE [ ] -50 1.00E+ 1.00E+ 1.00E+ 1.00E+ 1.00E+ 1.00E+ 1.00E+ 02 03 04 05 06 07 08 Fig3. Circuit Current1 Fig4. Circuit Current2 FREQUENCY[Hz] Fig5. Frequency characteristics (Supply voltage dependence) 0.1 10 0.1 0 GAIN -50C 100C -20 PHASE [deg] -10 25C GAIN [dB] 0.01 PHASE -30 -50C 25C 100C 0.01 -40 -50 1.00E+ 1.00E+ 1.00E+ 1.00E+ 1.00E+ 1.00E+ 1.00E+ 02 03 04 05 06 07 08 0.001 4.4 4.6 4.8 5 5.2 5.4 5.6 0.001 -50 0 50 100 FREQUENCY[Hz] Fig6. Frequency characteristic (Temperature dependence) Fig7. Distortion (Supply voltage dependence) Fig8. Distortion (Temperature dependence) 6/8 PHASE [deg] 4.3 8 -10 5.0V GAIN [dB] 100 100 250 98 98 200 96 96 94 94 150 92 92 90 4.4 4.6 4.8 5 5.2 5.4 5.6 90 -50 0 50 100 100 -50 0 50 100 Fig9. S/N ratio (Supply voltage Dependence) -80 Fig10. S/N ratio (Temperature dependence) -80 -80 Fig11. ON Resistance -85 -85 -85 -90 -90 -90 -95 -95 -95 -100 -50 0 50 100 -100 -50 0 50 100 -100 -50 0 50 100 Fig12. MUTE Attenuation Fig13. ASW Crosstalk Fig14. Channel Crosstalk Cautions on use 1. Numbers and data in entries are representative design values and are not guaranteed values of the items. 2. 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. 3. 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. 4. -5V pin potential Ensure a minimum -5V pin potential in all operating conditions. Make sure that no pins are at a voltage below the -5V pin at any time, regardless of whether it is a transient signal or not. 5. Thermal design Perform thermal design, in which there are adequate margins, by taking into account the permissible dissipation (Pd) in actual states of use. 6. 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. 7. Operation in strong electromagnetic field Using the ICs in a strong electromagnetic field can cause operation malfunction. 8. Supply voltage Although basic circuit function is guaranteed under normal voltage operation (5V: ±4.5 5.5V, 12V: 11.5 12.5V), ensure each parameter complies with appropriate electrical characteristics, when using this device. 9. The application circuitry example SW and FS output are controlled by BD3825FS which in turn is controlled by BH7624KS2 and therefore, BD3825FS and BH7624KS2 should be used in conjunction. Pins 18 and 24 should be pulled down by 10k resistor. Pins 1, 2, 6, 7, 10, 12 must be controlled by the microcontroller when using BD3825FS on its own. 7/8 Selection of order type B D 3 8 2 TYPE BD3825FS 5 F S E 2 Package, Foaming specification SSOP-A24