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p-dip-18-5 p-dso-28-1 7 x 5 video matrix switch tda 6920 semiconductor group 1 12.96 1 overview 1.1 features l fast i 2 c bus controlled (max. 400 khz) l cascadable (2 bus addresses) l 7 cvbs inputs, 5 outputs 3 inputs with clamp disable by bus l 1 input selectable as y-input (s-vhs) l 1 additional c-input (s-vhs) l y+c operation for s-vhs selected by bus l fully esd protected l C 60 db max. crosstalk at 5 mhz (p-dso-28-1 only) l low operating voltage of 7.5 v l 5 v operation is possible with reduced output signals of max. 2 vpp l 15 mhz minimum bandwidth l noise insensitive clamping inputs l low impedance off condition separate for each output 1.2 general description the tda 6920 switches 7 video input sources to 5 outputs. each output can be switched to only one input, but one input can be switched to all outputs. the c-input may be combined with one cvbs input as y for y+c (s-vhs) operation. y+c operation is selected by bus. 1.3 application l television sets l satellite receivers l video mixing desks type ordering code package tda 6920 q67000-a5200 p-dip-18-5 tda 6920x q67007-a5225 geg p-dso-28-1
tda 6920 semiconductor group 2 1.4 pin configuration (top view) figure 1 p-dip-18-5 p-dso-28-1
tda 6920 semiconductor group 3 1.5 pin definitions and functions pin no. symbol function p-dip-18-5 p-dso-28-1 C 1 gnd signal and power supply ground 2 2 in1 cvbs input 1 C 3 gnd signal and power supply ground 3 4 in2 cvbs input 2 C 5 gnd signal and power supply ground 4 6 in3 cvbs input 3 C 7 gnd signal and power supply ground 5 8 in4 cvbs input 4 C 9 gnd signal and power supply ground 6 10 in5 cvbs input 5 C11 v ref reference voltage for external use 7 12 in6 cvbs input 6 9 13 gnd power supply groung 8 14 in7 cvbs input 7 10 15 scl i 2 c-bus clock 11 16 sda i 2 c-bus data 12 17 address address selection 13 18 out5 cvbs output 5 C 19 gnd signal and power supply ground 14 20 out4 cvbs output 4 C 21 gnd signal and power supply ground 15 22 out3 cvbs output 3 C 23 gnd signal and power supply ground 16 24 out2 cvbs output 2 C 25 gnd signal and power supply ground 17 26 out1 cvbs output 1 18 27 v cc positive power supply voltage 1 28 c separate color adding input for input 1
tda 6920 overview semiconductor group 4 1.6 pin description c (color input) in 2, 3, 4 (cvbs input) in 2, 5, 6, 7 (cvbs input) scl, address
tda 6920 overview semiconductor group 5 sda v ref (so-28 only) out 1-5 (cvbs output)
tda 6920 semiconductor group 6 1.7 functional block diagram figure 2 block diagram (p-dso-28-1)
tda 6920 semiconductor group 7 2 functional description the main function of the ic is to switch 7 input video sources to 5 outputs. each output can be switched to only one input. it is possible to have the same input connected to several outputs. 3 of the inputs can be used as non-clamping-input, switching is controlled by bus. the clamping function of the other 4 inputs can be overriden by external resistor divider. the other 4 inputs can be switched to non-clamping mode with external r/c network. all switching possibilities are controlled by the i 2 c bus. all outputs can be switched to low impedance off condition by the i 2 c bus. driving 75 w load requires external transistors for best performance. the recommended coupling capacitor at each input is 47 nf. each clamping input requires a 75 w (max. 500 w ) termination resistor. operation without or with a termination resistor greater than 500 w causes malfunction of the new high performance clamping circuit. unused inputs should be directly grounded. 6 8 bits are necessary to determine one complete configuration change. (1 addressbyte, 5 databytes) minimum configuration change for 1 output needs 2 8 bit (1 addressbyte, 1 databyte). power on reset state: all 5 outputs switched to input 1, all inputs clamped, y+c off. l address selection (fast i 2 c bus) 1st byte of transmisson (8 bit) hex binary address pin msb lsb 96 1001 0110 v cc (min. 3 v) 94 1001 0100 gnd
tda 6920 semiconductor group 8 l data mode selections (fast i 2 c bus) 2nd byte of transmission (8 bit) 1) ..x = dont care 1) ..x = dont care output selection (3 bit, bit 7 must always be 0) b7 b6 1) b5 b4 b3 b2 b1 b0 1) selected output 0x 000 xxx - not used 0x 001 xxx out1 0x 010 xxx out2 0x 011 xxx out3 0x 100 xxx out4 0x 101 xxx out5 0x 110 xxx - not used 0x 111 xxx - not used input selection clamped (3 bit, bit 7 must always be 0) b7 b6 b5 b4 b3 1) b2 b1 b0 selected input 0x xxx 000 output off condition 00 xxx 001 in1 00 xxx 010 in2 00 xxx 011 in3 00 xxx 100 in4 0x xxx 101 in5 0x xxx 110 in6 0x xxx 111 in7
tda 6920 semiconductor group 9 l data mode selections (fast i 2 c bus) continued 2nd byte of transmission (8 bit) l bus protocol (fast i 2 c bus) programming example: sda sequence 1) x = dont care (if only input operation mode change is requested, b5, b4 b3 should be 0, 0, 0: no output configuration is changed.) input selection non clamped / y+c (y: always clamped. c: non clamped) (3 bit, bit 7 must always be 0) b7 b6 b5 b4 b3 1) b2 b1 b0 selected input 00 xxx 001 in1, (y+c) off 00 xxx 010 in2, clamp on 00 xxx 011 in3, clamp on 00 xxx 100 in4, clamp on 01 xxx 001 in1, (y+c) on 01 xxx 010 in2, clamp off 01 xxx 011 in3, clamp off 01 xxx 100 in4, clamp off start condition address 96 h 1st data: output 4 connect to input 3 clamped msb lsb ..... mode output input 10 1001 0110 00 100 011 data: output 5 connect to input 1 (y+c) last data: output 1 connect to input 4 not clamped stop condition ..... mode output input ..... mode output input 01 101 001 01 001 100 01 serial data stream
tda 6920 semiconductor group 10 3 electrical characteristics note: maximum ratings are absolute ratings; exceeding only one of these values may cause irreversible damage to the integrated circuit. 3.1 absolute maximum ratings parameter symbol limit values unit test condition min. max. supply voltage ( v cc ) v cc 014v reference voltage (p-dso-28-1 only) v ref 05v reference current ( r lmin = 1 k w) i ref 3.5 ma output voltage v out1 - out5 0 v cc v output current ( r lmin = 500 w) i out1 - out5 5ma input voltage v c 0 v cc v input voltage v in1 - in7 0 v cc v scl, sda, address input voltage v sda, scl, address 0 v cc v esd-voltage all pins hbm ( r = 1.5 k w , c = 100 pf) v esd C 6 6 kv junction temperature t j 150 c storage temperature t stg C 40 125 c thermal resistance (system - air) r th sa 75 k/w
tda 6920 semiconductor group 11 note: in the operating range the functions given in the circuit description are fulfilled. 3.2 operating range parameter symbol limit values unit test condition min. max. supply voltage v cc 7.5 13.2 v absolute minimum supply voltage (only usable with reduced output signals of max. 2 vpp) v cc 4.5 v reference voltage (p-dso-28-1 only) v ref 3.3 3.9 v video-input frequency range C 3db | in in1 - in7, c 0 20 mhz video-input ac-voltage (color) v c 1.0 vpp video-input ac-voltage (y, cvbs) v in1 - in7 1.7 vpp video-output ac-voltage v out1 - out5 3.4 vpp input dc-voltage v c 1.3 2.3 v input dc-voltage (clamping) v in1 - in7 1.8 3.5 v input dc-voltage (non clamping) v in2, 3, 4 1.5 3.2 v input source-impedance (clamping) ri in1 - in7 0 500 w i 2 c-bus clock | in sda, scl 0 500 khz ambient temperature during operation t a C 10 85 c
tda 6920 semiconductor group 12 3.3 dc characteristics t a = 25 c, v cc = 8.5 v parameter symbol limit values unit test condition min. typ. max. total current consumption i cc 42 58 ma r l = reference voltage (p-dso-28-1 only) v ref 3.4 3.6 3.8 v r l = output dc-voltage (clamping) v out1 - out5 1.8 v v c, in1 - in7 = 0 vpp output dc-voltage (output off) v out1 - out5 0.8 v v c, in1 - in7 = 0 vpp output current i out1 - out5 0.5 1.0 2.0 ma v out = 2 v, in = 0 vpp input dc-voltage v c 1.8 v v c = 0 vpp input dc-voltage (clamping) v in1 - in7 1.8 v v in1 - in7 = 0 vpp input current (clamping) i in1 - in7 0.33 1 m a i in1 - in7 = 0 vpp input dc-voltage (for ext. clamping override) v in1 - in7 2.4 v v in1 - in7 = 0 vpp input dc-voltage (non- clamping, bus controlled) v in2, 3, 4 2.4 v v in2, 3, 4 = 0 vpp input current (scl, sda, address) i sda, scl i address 0.1 0.4 m a v sda, scl = 0 v v address = 0 v output current (sda) i sda 6ma v sda = 0.6 v output voltage low (sda) v sda v sda 0 0 0.2 0.3 0.4 0.6 v v i sda = 3 ma sink i sda = 3 ma sink scl, sda, address (96 hex) : high v sda, scl v address 3.0 v cc v scl, sda, address (94 hex) : low v sda, scl v address 0 1.5 v scl, sda, address (hysteresis) v sda, scl v address 0.2 1 v dependant on input frequency
tda 6920 semiconductor group 13 note: the listed characteristics are ensured over the operating range of the integrated circuit. typical characteristics specify mean values expected over the production spread. if not otherwise specified, typical characteristics apply at t a =25 c and the given supply voltage. 3.4 ac characteristics t a = 25 c, v cc = 8.5 v parameter symbol limit values unit test condition min. typ. max. video bandwidth p out/in 15 20 mhz C 3 db point video gain v out/in 1.9 2.0 2.1 crosstalk (0 - 5 mhz) p-dso-28-1 a C 65 C 60 db inputs 75 w to gnd crosstalk (0 - 5 mhz) p-dso-28-1 a C 55 C 50 db inputs 500 w to gnd crosstalk (0 - 5 mhz) p-dip-18-5 a C 62 C 60 db inputs 75 w to gnd crosstalk (0 - 5 mhz) p-dip-18-5 a C 45 C 50 db inputs 500 w to gnd input ac-voltage v c 0.75 1 vpp sinus input ac-voltage v in1 - in7 1 1.5 vpp clamped input ac-voltage (sinus) v in2, 3, 4 1 1.5 vpp non clamped output ac-voltage v out1 - out5 2 3 vpp i 2 c-bus clock | in sda, scl 400 500 khz output linearity dg out1- out5 0.2 1 % r l = input resistance (non-clamping) r c, in2, 3, 4 40 50 k w input source-impedance (clamping) r in1 - in7 0 75 500 w input coupling-capacitor (clamping) c in1 - in7 47 10 nf m f cvbs-signal > 20 hz audiosignal output dyn. impedance r out1 - out5 50 75 w
tda 6920 semiconductor group 14 4 test circuits figure 3 test circuit (p-dso-28-1)
tda 6920 semiconductor group 15 figure 4 test circuit (p-dip-18-5)
tda 6920 semiconductor group 16 5 application circuits figure 5 application circuit p-dso-28-1 (clamping inputs)
tda 6920 semiconductor group 17 figure 6 application circuit p-dso-28-1 (no clamping inputs with clamping overide)
tda 6920 semiconductor group 18 figure 7 application circuit (p-dip-18-5)
tda 6920 semiconductor group 19 6 electrical diagrams typical frequency response and crosstalk (simulated) for p-dso-28-1 package conditions: v cc = 8.5 v, all outputs selected to one different input; response: the measured output has max. signal on the selected input; crosstalk: the measured output has no signal on the selected input, another input has max. signal
tda 6920 semiconductor group 20 7 package outlines p-dip-18-5 (plastic dual in-line package) gpd05586 p-dso-28-1 (plastic dual small outline package) gps05123 sorts of packing package outlines for tubes, trays etc. are contained in our data book package information. dimensions in mm smd = surface mounted device

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