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:
2.Features
• Easy on-board integration
• Drastically reduces:
– the size of the tuner function
– the power consumption
n Fully integrated IF selectivity; eliminating the need for external SAW filters
n Fully integrated oscillators with no external components
n Integrated wideband gain control
n Alignment free
n RF loop-through for easy implementation in the Set-Top Box (STB)
n Integrated die thermal sensor
n Single 3.3 V power supply
n Low power consumption (750 mW)
n Crystal oscillator output buffer (16 MHz) for single crystal applications
n I2C-bus interface compatible with 3.3 V and 5 V microcontrollers
n Three Standby modes
n RoHS packaging
3.Applications
n DVB-T Set-Top Box (STB) and TV receiver
n System application optimization is described in the application note
n Driver application is described in the application note
AN0814
AN0822
NXP Semiconductors
TDA18218HN
DVB-T Silicon Tuner IC
4.Quick reference data
Table 1.Quick reference data
T
=25°C; VCC= 3.3 V; IF output level option = 2 V (p - p); IF output load=1kΩ on each terminal
amb
Symbol ParameterConditionsMinTypMaxUnit
f
RF
NF
ϕ
n
Ppower dissipation-775-mW
V
i(max)
α
image
S
dig
[1] Measured with TDA10048 channel decoder.
RF frequencycenter of channel174-864MHz
tuner noise figurenormal mode; maximum gain-57dB
tun
phase noiseworst case in the RF frequency range
10 kHz-−85-dBc/Hz
100 kHz-−105-dBc/Hz
maximum input voltage1 dB gain compression, one analog TV signal-108-dBµV
image rejectionnormal mode-65-dB
digital sensitivityDVB-T (64QAM 2/3); BER = 2 × 10
−4[1]
-−82-dBm
5.Ordering information
Table 2.Ordering information
Type numberPackage
TDA18218HNHVQFN48plastic thermal enhanced very thin quad flat package;
RF_IN1unbalanced RF input
i.c.2internally connected; leave open
i.c.3internally connected; leave open
GND(RF)4RF ground
i.c.5internally connected; leave open
i.c6internally connected; leave open
GND(IF)7IF ground
V
CC(IF)
8IF supply voltage (3.3 V)
i.c.9internally connected; leave open
CAPREG_VCO10VCO supply decoupling
GND(VCO)11VCO ground
V
CC(PLL)
12PLL supply voltage
GND(PLL)13PLL ground
VTLO14local oscillator (LO) tuning voltage input
CPLO15charge pump of the LO synthesizer
XTAL_P16crystal oscillator input positive
XTAL_N17crystal oscillator input negative
i.c.18internally connected; leave open
XTO_P19crystal oscillator output buffer positive
XTO_N20crystal oscillator output buffer negative
XTAL_MS21XTAL out mode
AS22I
GND(IF)23IF ground
CP_K24charge pump of the calibration synthesizer
VT_K25tuning voltage of the calibration synthesizer
REG1826internal regulator decoupling
REG2827internal regulator decoupling
GND(IF)28IF ground
V
CC(IF)
IFO_N30IF output negative
IFO_P31IF output positive
VIFAGC32IF gain control input
i.c.33internally connected; leave open
GND(DIG)34digital ground
SCL35I
SDA36I
CAPRFAGC37RF AGC filtering
GND(RF)38RF ground
i.c.39internally connected; leave open
GND(RF)40RF ground
GND(RF)41RF ground
GND(RF)42RF ground
i.c.43internally connected; leave open
GND(RF)44RF ground
V
CC(RF)
LT46loop-through
V
CC(RF)
i.c.48internally connected; leave open
29IF supply voltage (3.3 V)
45RF supply voltage
47RF supply voltage
…continued
2
C-bus address selection input
2
C-bus clock input
2
C-bus data input and output
8.Functional description
The RF input signal is driven to a low-noise amplifier. It is then amplified and fed to the
image rejection mixer.The mixer down-converts the RF signal to a low IF frequency,which
depends on channel bandwidth (standard IF filters are implemented for 6 MHz, 7 MHz
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.
8.1AGC1 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.
TDA18218HN
DVB-T Silicon Tuner IC
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.
8.2AGC2 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.
8.3IF 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.
It should be noted that the level control is always operating.
The strategy of the level detection has to be adapted for each type of channel decoder. It
must be defined to satisfy ADC sampling (minimum level, ADC headroom).
All AGC amplifiers are controlled independently.
8.4Power-down mode
The TDA18218HN can be programmed in Standby mode. The following blocks are turned
off when programming a power-down:
• AGC2 and its level detector
• BP filter
• Mixer and VCO
• IF selectivity LPFc
• IF AGC
Remaining functions are:
TDA18218HN
DVB-T Silicon Tuner IC
• Loop-Through
• 16 MHz clock output (to drive a channel decoder)
2
• I
C-bus Core (to wake-up the IC later on)
9.Control interface
9.1I2C-bus format, write and read mode
I2C-bus uses two pins (SDA and SCL) to transfer information between devices connected
to the bus. The SDA pin provides bidirectional data transfer. While the SCL pin provides
the timing sequences. Data can be read and written as follows:
Write mode:
• Any register can be written to using its subaddress
• Any following (contiguous) registers can be written using the subaddress of the first
register
Read mode:
• The read after Restart mode is not allowed.In addition, registers cannot be read using
the subaddress of the register. However, registers can be read as follows:
– from 00h to 16h
– from 00h to 27h
– from 00h to 3Ah
– from 00h to any register subaddress, if MSB = 1 for the next register
The programmable module address bits MA[1:0] allow up to four tuners to be addressed
in one system. Bits MA[1:0] are programmed by applying a specific voltage (VAS) to pin
AS. The relationship between the status of bits MA[1:0] and the voltage applied to pin AS
is shown in Table 5.
Table 5.Address byte 1 bit descriptions
Legend: * power-on reset value.
BitSymbolAccessValueDescription
7 to 3-R/W1 1000*must be set to 1 1000
2 to 1MA[1:0]R/Wprogrammable address bit value set with V
0R/WR/W0write mode
TDA18218HN
DVB-T Silicon Tuner IC
00VAS= 0 V to 0.1 × V
01VAS= 0.2 × VCC to 0.3 × V
10VAS= 0.4 × VCC to 0.6 × V
11VAS= 0.9 × VCC to V
7 to 6-R/W00*must be set to 00
5 to 0AD[5:0]R/W-programmable address bits of the first
programming byte
9.2.1Device type address ID
Table 7.ID byte bit descriptions
Legend: * power-on reset value.
AddressRegisterBitSymbolAccess ValueDescription
00hID byte7-R1*must be 1
6 to 0ID[6:0]R100 0000*TDA18218HN device type address
9.3Crystal buffer output
TDA18218HN embeds a Xtal oscillator and a buffer to drive another IC. The buffer can be
configured through register XTOUT (I2C-bus sub address 19h). This buffer has been
designed to be AC coupled. This output can be used in differential or sinusoidal mode
(using XTO_N and XTO_P pins) or in asymmetrical or square mode (just leaving one pin
open).
It should be noted that TDA18218HN specification refers to differential output with no
load.
0temperature sensor switched off
1temperature sensor switched on
7TM_Range R/Wtemperature range selection
060°C to 90 °C
192°C to 122 °C
[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 = 0TM_RANGE = 1
000060 °C92°C
000162 °C94°C
001066 °C98°C
001164 °C96°C
010074 °C106 °C
010172 °C104 °C
011068 °C100 °C
011170 °C102 °C
100090 °C122 °C
100188 °C120 °C
101084 °C116 °C
101186 °C118 °C
110076 °C108 °C
04hRead byte 43 to 2 LT[1:0]R/W-sets LT gain in range: −6 dB to −15 dB; see
Table 14.RFin to LT gain control modes
Bit Manual_LT Pin XTAL_MS AGC1 and LT attenuator gain modes
0LOWAGC1 gain fixed at 6 dB; LT gain set by LT[1:0]; see
0HIGHLT gain set automatically function of AGC1 gain; see
1LOWAGC1 gain fixedat gain set by AGC1[2:0];LT gain set by LT[1:0];
Table 15
see
1HIGHAGC1 gain set automatically; LT gain set by LT[1:0]; see
Table 15
Table 14
Table 15
Table 15
Table 15
Table 15
Table 15.Loop-through attenuator gain settings
LT[1]LT[0]Loop-through gain
00−6dB
01−9dB
10−12 dB
11−15 dB
9.9PLL settings
Table 16.PLL bit descriptions
Address RegisterBitSymbolAccess Value Description
0AhMain divider byte 3 7 to 0 LO_Frac_0[31:24] R-LO frequency setting (kHz); in automatic mode
0BhMain divider byte 4 7 to 0 LO_Frac_1[23:16]
0ChMain divider byte 5 7 to 4 LO_Frac_2[15:12]
01hRead byte 16LO_LockRLO lock flag
0PLL unlocked
1PLL locked
5CAL_LockRcalibration oscillator lock flag
0PLL unlocked
1PLL locked
0FhMain divider byte 8 6Freq_prog_StartW1launch automatic mode of PLL calculation (LO
and calibration synthesizer); automatically
reset to logic 0 (internally) when LO and
calibration are completed
Table 21.General characteristics for TV reception (RF input to IF output)
T
=25°C, VCC= 3.3 V, IF output level option 2 V (p - p), IF output load = 1 kΩ on each pin; unless otherwise specified.
amb
…continued
SymbolParameterConditionsMinTypMaxUnit
t
set
f
tun(step)
V
i(max)
setting timechannel change--60ms
tuner frequency (step size)-1-kHz
maximum input voltage1 dB gain compression, one analog
-108-dBµV
TV signal
S
dig
[1] XTAL buffer off.
[2] Measured at 3.3 V.
[3] Measured at 3.47 V.
[4] Difference defined between maximum and minimum over the IF bandwidth.
[5] Measured with TDA10048 channel decoder.
[1] Typical value is HIGH impedance input.
[2] Devices that use non-standard supply voltages, which do not conform to the intended I2C-bus system levels, must relate their input
levels to the supply voltage to which the pull-up resistors are connected.
Objective [short] data sheetDevelopmentThis document contains data from the objective specification for product development.
Preliminary [short] data sheet QualificationThis document contains data from the preliminary specification.
Product [short] data sheetProductionThis document contains the product specification.
[1] Please consult the most recently issued document before initiating or completing a design.
[2] The term ‘short data sheet’ is explained in section “Definitions”.
[3] The product status of device(s) described in this documentmay havechanged since thisdocument was publishedand may differ in caseof multiple devices.The latest product status
information is available on the Internet at URL
[1][2]
Product status
18.1Definitions
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modifications or additions. NXP Semiconductors does not give any
representations or warranties as to the accuracy or completeness of
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use of such information.
Short data sheet — A short data sheet is an extract from a full data sheet
with thesame product type number(s) andtitle. A short data sheet isintended
for quickreference only and should not be relied upon to containdetailed and
full information. For detailed and full information see the relevant full data
sheet, which is available on request via the local NXP Semiconductors sales
office. In case of any inconsistency or conflict with the short data sheet, the
full data sheet shall prevail.
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General — Information in this document is believed to be accurate and
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limitation specifications and product descriptions, at any time and without
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NXP Semiconductors products in such equipment or applications and
therefore such inclusion and/or use is at the customer’s own risk.
[3]
http://www.nxp.com.
Definition
Applications — Applications that are described herein for any of these
products are for illustrative purposes only. NXP Semiconductors makes no
representation or warranty that such applications will be suitable for the
specified use without further testing or modification.
Limiting values — Stress above one or more limiting values (as defined in
the Absolute MaximumRatingsSystem of IEC 60134) may cause permanent
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the device at these or any other conditions above those given in the
Characteristics sections of this document is not implied. Exposure to limiting
values for extended periods may affect device reliability.
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Quick reference data — The Quick reference data is an extract of the
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Notice: Allreferenced brands, productnames, service names and trademarks
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