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TDA18271HD_09 데이터시트(Datasheet) 6 Page - NXP Semiconductors

부품명 TDA18271HD_09
상세내용  Silicon Tuner IC
PDF  70 Pages
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제조사  NXP [NXP Semiconductors]
홈페이지  http://www.nxp.com
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TDA18271HD_4
© NXP B.V. 2009. All rights reserved.
Product data sheet
Rev. 04 — 19 May 2009
6 of 70
NXP Semiconductors
TDA18271HD
Silicon Tuner IC
8.
Functional description
The RF input signal is driven to a low-noise amplifier. It is then band-pass filtered,
amplified and fed to the image rejection mixer. The mixer downconverts the RF signal to a
low IF depending on the channel bandwidth.
Standard IF filters are implemented for 1.5 MHz, 6 MHz, 7 MHz and 8 MHz channel
bandwidths; see Table 43.
The Silicon Tuner can be used either as TV receiver or FM radio receiver.
The TDA18271HD requires a single 16 MHz crystal for clock generation. When bit
XTOUT_ON = 1, a clock signal is available on pins XTOUTP and XTOUTN to drive a
second tuner, a channel decoder or an IF demodulator (TDA8295) for analog TV reception
and FM radio.
Remark: Most recent video decoders from NXP Semiconductors include a low IF
demodulation function.
8.1 TV and FM reception
The Silicon Tuner can be used in two modes, selectable via the I2C-bus:
TV reception: the RF signal must be connected to pin RF_IN
FM reception: the RF signal must be connected to pin FM_IN or RF_IN
The RF_IN input pin can also be used for FM reception at the cost of software
modification. The FM_IN input pin can only receive signals in the FM frequency range.
8.2 Master and slave operation
The TDA18271HD allows easy dual-tuner configuration.
Each individual tuner has to be set either to Master mode or Slave mode by applying a
specific DC voltage to the XTOUT_MS pin; see Table 4. This will decide whether the
crystal oscillator part is used as negative impedance connected to the crystal part or as a
current buffer.
In dual tuner applications:
The first tuner is set to Master mode
The second tuner has to be set to Slave mode
In single tuner applications:
The tuner must be set to Master mode
Table 4.
Master/slave selection
Voltage on pin XTOUT_MS
Tuner type
Crystal oscillator function
0 V to 0.1VCC
master
negative impedance presented to the crystal
0.4VCC to 0.6VCC
slave
current input buffer




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