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PDF TDA18218HN Data sheet ( Hoja de datos )
| Número de pieza | TDA18218HN | |
| Descripción | DVB-T Silicon Tuner IC | |
| Fabricantes | NXP Semiconductors | |
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TDA18218HN
DVB-T Silicon Tuner IC
Rev. 01 — 8 July 2009
www.DataSheet4U.com
Product data sheet
1. General description
The TDA18218HN is a Silicon Tuner IC designed for digital terrestrial (DVB-T) TV
reception. The TDA18218HN integrates the overall tuning function, including selectivity
and provides a low-IF output signal.
The TDA18218HN uses integrated IF filters to support 6 MHz, 7 MHz or 8 MHz channel
bandwidths. The TDA18218HN requires only one single 16 MHz crystal for clock
generation. A clock signal is available on crystal oscillator output pins (XTO_P / XTO_N)
to synchronize the channel decoder.
The TDA18218HN is a low cost Silicon Tuner targeting digital terrestrial applications. The
TDA18218HN matches the performance of the conventional can tuners. Additionally, the
following benefits can be stated:
• Easy on-board integration
• Drastically reduces:
– the size of the tuner function
– the power consumption
2. Features
I Fully integrated IF selectivity; eliminating the need for external SAW filters
I Fully integrated oscillators with no external components
I Integrated wideband gain control
I Alignment free
I RF loop-through for easy implementation in the Set-Top Box (STB)
I Integrated die thermal sensor
I Single 3.3 V power supply
I Low power consumption (750 mW)
I Crystal oscillator output buffer (16 MHz) for single crystal applications
I I2C-bus interface compatible with 3.3 V and 5 V microcontrollers
I Three Standby modes
I RoHS packaging
3. Applications
I DVB-T Set-Top Box (STB) and TV receiver
I System application optimization is described in the application note AN0814
I Driver application is described in the application note AN0822
1 page  
NXP Semiconductors
TDA18218HNwww.DataSheet4U.com
DVB-T Silicon Tuner IC
and 8 MHz channel bandwidths). The TDA18218HN requires a single 16 MHz crystal for
clock generation, a 16 MHz differential sine wave clock reference is available to drive a
channel decoder.
8.1 AGC1 stage
The TDA18218HN embeds 2 different RF amplifiers with internal gain control.
The first stage, AGC1, behaves like a LNA (Low noise amplifier); its gain can take 4
different values (15 dB, 12 dB, 9 dB and 6 dB). Purpose of this amplifier is to ensure a low
noise figure for the tuner.
In order to optimize noise and linearity performances an internal level detector selects the
appropriate gain:
• If the signal level at the tuner is low, the gain is set to the maximum value (15 dB).
• If the signal level at the tuner input is high, the gain is set to the minimum value (6 dB).
• In between the gain is set to an intermediate value 12 dB or 9 dB.
The strategy of the level detection is a proprietary algorithm from NXP, managed by the
driver.
It should be noted that:
1. The level detector measures the signal level within the complete RF frequency range,
i.e. from 50 MHz to 870 MHz. Consequently, AGC1 gain is adapted to the complete
RF power. If a strong signal is present at the tuner input, it will determine AGC1 gain
(even if it is not the wanted signal). This concept prevents the tuner from overloading.
2. The level control is always operating.
8.2 AGC2 stage
The second stage, AGC2, is also an amplifier with a gain controlled thanks to a level
detector.
The gain is controlled between −12 dB and +16.4 dB, it is adapted by steps of 0.2 dB.
It should be noted that:
1. The level control is always operating. Consequently, this amplifier is responsible for
adapting the daily level changes.
2. The level detector measures the signal level within the complete RF frequency range
(same as AGC1)
The strategy of the level detection is a proprietary algorithm from NXP, managed by the
driver.
8.3 IF AGC
Finally, in order to adapt the tuner output level, a last amplifier is used (IF AGC). This
amplifier delivers the appropriate level to the DVB-T channel decoder. The output level is
therefore controlled thanks to the DC voltage applied on VIFAGC pin. This voltage is
commonly delivered by the channel decoder.
TDA18218HN_1
Product data sheet
Rev. 01 — 8 July 2009
© NXP B.V. 2009. All rights reserved.
5 of 25
5 Page 
NXP Semiconductors
TDA18218HNwww.DataSheet4U.com
DVB-T Silicon Tuner IC
Table 8.
Address
19h
Crystal buffer output register bit descriptions
Register
Bit Symbol Access Value
XTOUT byte 3 to 0 XtOut[3:0] R/W
0
1
2
7
8
9
10
other
Description
crystal buffer output
XTAL off
XTOUT off
square wave 16 MHz
sine wave 200 mV
sine wave 400 mV
sine wave 800 mV
sine wave 1200 mV
not applicable
9.4 Temperature sensor
Table 9. Temperature sensor bit descriptions
Address Register Bit Symbol Access Value Description
1Dh
PSM byte 2 6
TM_ON W
temperature sensor on or off
0 temperature sensor switched off
1 temperature sensor switched on
7 TM_Range R/W
temperature range selection
0 60 °C to 90 °C
1 92 °C to 122 °C
01h Read byte 1 3 to 0 TM_D[3:0] R
- die temperature[1]
[1] The die temperature can be read as shown in Table 10.
Table 10. Die temperature values
TM_D[3:0]
Temperature range selection (die temperature)
TM_RANGE = 0
TM_RANGE = 1
0000
60 °C
92 °C
0001
62 °C
94 °C
0010
66 °C
98 °C
0011
64 °C
96 °C
0100
74 °C
106 °C
0101
72 °C
104 °C
0110
68 °C
100 °C
0111
70 °C
102 °C
1000
90 °C
122 °C
1001
88 °C
120 °C
1010
84 °C
116 °C
1011
86 °C
118 °C
1100
76 °C
108 °C
TDA18218HN_1
Product data sheet
Rev. 01 — 8 July 2009
© NXP B.V. 2009. All rights reserved.
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