SIEMENS TUA2000-4 BASED TUNER (For VST)
The TUA 2000-4 is a monolithically integrated circuit and suitable as a tuner for the VHF
range up to 400 Mkz, e.g. for TV tuners.
RF section
Few externa! components
Stable oscillator frequency and amplitude with very low interference radiation
Optimal rejection of oscillator and input frequencies at the IF output due to a decoupled
active ring mixer circuit
High interference voltage resistance
High-impedance mixer input, for symmetrical and asymmetrical connections
IF post-amplifier for the UHF IF signal
IF section
@
Optimal cross-talk rejection
@
Large signal-modulation range
@
Low noise figure with wide minimum over large load-impedance range
Circuit description
The TUA 2000-4 contains a symmetrical mixer input, as well as a multiplicative mixer. The
oscillator amplitude is regulated. All oscillator operating currents and voltages are stabilized,
so that the oscillator’s amplitude and frequency are largely independent of temperature
and operating voltage changes.
The IF amplifier has been provided with a high impedance input.
The output has two open collector connections.
During UHF operation, oscillator and mixer are switched off and the UHF IF input coupling
stage is activated.
RF section
Few external components
Stable oscillator frequency and amplitude with very low interference radiation
Optimal rejection of oscillator and input frequencies at the iF output due to a decoupled
active ring mixer circuit
High interference voltage resistance
High-impedance mixer input, for symmetrical and asymmetrical connections
IF post-amplifier for the UHF IF signa!
IF section
@
Optima! cross-talk rejection
@
Large signal-modulation range
@
Low noise figure with wide minimum over large load-impedance range
Pin description
- “Open collector” output of the IF SAW driver
- “Open collector” output of the IF SAW driver
- Input for external reference voltage
- Low-ohmic collector output to the high reference point of a parallel resonant circuit
- High-ohmic base input to the high reference point of a parallel resonant circuit
- Oscillator signal output for counter connection
- GND
- “Open collector” output of the mixer
- “Open collector” output of the mixer
- Supply voltage
- Asymmetrical IF signal input for the UHF IF signal
- Mixer high-impedance differential input
- Mixer high-impedance differential input
- Switching voltage input for the VHF-UHF switch selection
- Asymmetrical signal input of the IF SAW amplifier
- GND
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