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 preamplifier with a low output impedance to drive the SAW filter directly
· Band gap voltage stabilizer for oscillator stability
· Electronic band switch
· External IF filter between the mixer output and the IF amplifier input
· Pin-to-pin compatible with TDA5636; TDA5637 family (same function with asymmetrical IF output).Application· 3-band all channel TV and VCR tuners
· Any standard.Pinout
Specifications
| 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 |
DescriptionThe TDA5636B and TDA5637B 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 of TDA5636B and TDA5637B require a power supply of 9 V and are available in a very small package.
The TDA5636B and TDA5637B give the designer the capability to design an economical and physically small 3-band tuner. They 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, TDA5636B and TDA5637B 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 TDA5636B and TDA5637B belong to the TDA5636/TDA5737 family which has exactly the same function with an IF amplifier having an asymmetrical IF output to drive a 75 W load. It is possible to build tuners with either an asymmetrical or a symmetrical IF output with one main tuner lay-out.
TDA5637B Data Sheet
