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TUA2009XS Datasheet

  • TUA2009XS

  • VHF I / VHF II / UHF-Tuner IC

  • 16頁

  • INFINEON   INFINEON

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VHF I / VHF II / UHF-Tuner IC
Preliminary Data
Features
q
Few external components
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 high-
impedance inputs for the VHF I-frequency range
q
Double balanced mixer with wide dynamic range and low-
impedance 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 鈥?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 MOSFET-
amplifier, 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 UHF-
range, respectively. The input signal is mixed there with the oscillator signal from the activated
oscillator section and fed into common IF-stage for all bands. The IF-signal is further amplified in a
SAW-filter driver section in order to drive the SAW-filter with a low impedance.
Semiconductor Group
1
12.94

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