Features: · Balanced mixer with a common emitter input for band A (single input)· 2-pin oscillator for bands A and B· Balanced mixer with a common base input for bands B and C (balanced input)· 4-pin oscillator for band C· Local oscillator buffer output for external prescaler· SAW filter preamplif...
TDA5637: Features: · Balanced mixer with a common emitter input for band A (single input)· 2-pin oscillator for bands A and B· Balanced mixer with a common base input for bands B and C (balanced input)· 4-pi...
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SYMBOL | PARAMETER | MIN. | MAX. | UNIT |
VP | supply voltage | -0.3 | +10.5 | V |
VSW | switching voltage | 0 | 10.5 | V |
IO | output current of each pin to ground | - | -10 | mA |
tsc(max) | maximum short-circuit time (all pins) | - | 10 | s |
Tstg | IC storage temperature | 55 | +150 | °C |
Tamb | operating ambient temperature | -10 | +80 | °C |
Tj | junction temperature | - | +150 | °C |
The TDA5636 and TDA5637 are monolithic integrated circuits that perform the mixer/oscillator functions for bands A, B and C in TV and VCR tuners. These low-power mixer/oscillators require a power supply of 9 V and are available in a very small package.
The TDA5636 and TDA5637 give the designer the capability to design an economical and physically small 3-band tuner.
TDA5636 and TDA5637 are suitable for European standards, as illustrated in Fig.17, with the following RF bands:
· 48.25 to 168.25 MHz
· 175.25 to 447.25 MHz
· 455.25 to 855.25 MHz.
With an appropriate tuned circuit, TDA5636 and TDA5637 are also suitable for NTSC all-channel tuners (USA and Japan). The tuner development time can be drastically reduced by using these devices.
These circuits of TDA5636 and TDA5637 belong to the TDA5636B/TDA5637B family which has exactly the same function with an IF amplifier having a symmetrical IF output to drive a SAW filter directly. It is possible to build tuners with either an asymmetrical or a symmetrical IF output with one main tuner lay-out.