TDA18271HD/C2,557 NXP Semiconductors, TDA18271HD/C2,557 Datasheet - Page 6

• Manufacturer Part Number: TDA18271HD/C2,557
• Description: IC TV SILICON TUNER 64-HLQFN
• Manufacturer: NXP Semiconductors
• Type: Silicon Tunerr

Specifications of TDA18271HD/C2,557

• Applications: Set-Top Boxes
• Mounting Type: Surface Mount
• Package / Case: *
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 935285058557; TDA18271HD/C2; TDA18271HD/C2

NXP Semiconductors
8. Functional description
TDA18211HD_5
Product data sheet
8.2.1 Loop-through output
8.2.2 Slave tuner output
8.1 Master and slave operation
8.2 Tuner outputs
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, which depends on channel bandwidth (standard IF filters are implemented for
6/7/8 MHz channel bandwidths; see
The gain between the antenna pin (pin RF_IN) and the loop-through pin (pin LT) is 0 dB.
The TDA18211HD requires a single 16 MHz crystal for clock generation.
When bit XTOUT_ON = 1, a differential sine wave clock reference is available on pins
XTOUTP and XTOUTN to drive a channel decoder.
The TDA18211HD allows easy dual-tuner configuration.
Each individual tuner has to be set either in Master mode or Slave mode by applying a DC
voltage on the XTOUT_MS pin; see
part is used as negative impedance connected to the crystal part or as a current buffer.
Table 4.
In dual-tuner application:
In single-tuner application:
The tuner provides a slave tuner output (pin STO) and a loop-through output (pin LT).
Those outputs are used to transmit the antenna signal to other tuners. Each output has its
own characteristics (see
The gain between the antenna connector and the loop-through pin (pin LT) equals 0 dB.
This pin can be connected to any consumer electronic equipment.
The slave tuner output (pin STO) must be connected to the RF input of the slave tuner
TDA18211HD in case of dual-tuner applications.
The gain between the antenna connector and the slave tuner output can change
according to the input level. The slave tuner will automatically compensate the gain
change, using the MASTERSYNC and FREEZE signals.
Voltage on pin XTOUT_MS
0 V to 0.1V
0.4V
•
•
•
The first tuner is set in Master mode
The second tuner has to be set in Slave mode
The tuner must be set in Master mode.
CC
to 0.6V
CC
Master and slave selection
CC
Rev. 05 — 2 June 2009
Table 56
Tuner type
master
slave
and
Table
Table
Table
4. This will decide whether the crystal oscillator
41).
57)
Crystal oscillator
negative impedance presented to the crystal
current input buffer
TDA18211HD
DVB-T Silicon Tuner IC
© NXP B.V. 2009. All rights reserved.
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