TUA2009X Datasheet | Siemens Semiconductor Group

Features q Few external ponents q Frequency and amplitude-stable unbalanced oscillator for the VHF I-frequency range q Frequency and amplitude-stable balanced oscillators for the VHF II- and UHF-frequency range q Optimum decoupling of input frequency from oscillator q Double balanced mixer with wide dynamic range and highimpedance inputs for the VHF I-frequency range q Double balanced mixer with wide dynamic range and lowimpedance inputs for the VHF II- and UHF-frequency range q Low-impedance SAW-filter driver output q SAW-filter driver with high signal-handling capability q Internal band switch q Low-noise, internal reference voltage q Integrated 1st IF-bandpass filter TUA 2009X TUA 2009XS Bipolar IC P-DSO-24-1 P-SSOP-24-1 Type TUA 2009X TUA 2009X TUA 2009XS Ordering Code Q67000-A5113 Q67006-A5113 Q67006-A5202 Package P-DSO-24-1 (SMD) P-DSO-24-1 Tape & Reel P-SSOP-24-1 Tape & Reel Circuit Description This integrated circuit permits the design of TV-tuners covering the entire frequency range from 48 … 900 MHz split into 3 frequency bands. The application is suitable for all tuners in TV- and VCR-sets. The integrated circuit includes 3 balanced mixers (double balanced mixer/ring mixer), one unbalanced oscillator for VHF I and two balanced oscillators for VHF II and UHF, a SAW-filter driver amplifier as well as a reference voltage source and a band switch. Filters between tuner input and IC separate the TV-frequency signal into three bands. The band switch ensures that only one band at a time is activated. In the activated band the signal passes a frontend stage with MOSFETamplifier, a double-tuned bandpass filter and is then fed to the balanced mixer input of the IC which is a high-impedance stage for the VHF I-range and a low-impedance stage for the VHF II- and UHFrange, respectively. The input signal is mixed there with the oscillator signal from the activated oscillator section and fed into mon IF-stage for all bands. The IF-signal is further amplified in...