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TDA18211HD

DVB-T Silicon Tuner IC

NXP Semiconductors. 

NXP Semiconductors

TDA18211HD

DVB-T 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, which depends on channel bandwidth (standard IF filters are implemented for

6/7/8 MHz channel bandwidths; see Table 41).

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.

8.1 Master and slave operation

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 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.

Table 4. Master and slave selection

Voltage on pin XTOUT_MS Tuner type

0 V to 0.1VCC

0.4VCC to 0.6VCC

master

slave

In dual-tuner application:

Crystal oscillator

negative impedance presented to the crystal

current input buffer

• The first tuner is set in Master mode

• The second tuner has to be set in Slave mode

In single-tuner application:

• The tuner must be set in Master mode.

8.2 Tuner outputs

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 Table 56 and Table 57)

8.2.1 Loop-through output

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.

8.2.2 Slave tuner output

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.

TDA18211HD_5

Product data sheet

Rev. 05 — 2 June 2009

© NXP B.V. 2009. All rights reserved.

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