NXP cable silicon tuner TDA18250

NXP cable silicon tuner
TDA18250
High-performance silicon tuner
for cost-sensitive cable zapper STB
This advanced, single-package solution reduces size and cost by integrating all the functions
for receiving an RF channel in the cable TV band from 42 to 862 MHz.
Key features
 RF input with direct cable connection
 Low IF output, connecting directly to demodulators
 RF loop-through
 Frequency coverage: 42 to 862 MHz
 High sensitivity and high power robustness
 Multistandard cable reception covering i.e. NorDig and
SARFT standards
 Suppression of third and fifth signal harmonics
 Optimum adjacent channel rejection
 Single 3.3 V supply with low power consumption
 High accuracy Received Signal Strength Indicator (RSSI)
The NXP TDA18250 supports the trend of replacing can
tuners with silicon tuners to create cost-competitive set-top
boxes (STBs). High integration reduces the size and cost of the
application.
Designed for use in the cable TV band from 42 to 862 MHz,
this single-package device builds on NXP’s proven silicon tuner
technology and has been designed to minimize the number
and cost of external components. It offers all the features
required for reception in a single-stream STB.
Applications
 Single-tuner cable STBs
 Very small cable tuner modules
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TDA18250 block diagram
OM3914: TDA18250-based front-end
with TDA10024 cable demodulator
001aao328
OM3925C: TDA18250 tuner-only board for easy STB
integration and validation
OM3948C: TDA18250 tuner in can-tuner-like
enclosure for very small applications
001aao329
001aao330
Key parameters
Parameter
Value (typical)
Sensitivity (64 QAM)
34 dBµV
Max input level (64 QAM)
110 dBµV
Input return loss
-8 dB
CSO
-60 dB
CTB
-60 dB
IF selectivity
6/7/8/9 MHz 5th order LPF
0.4/0.85/1/1.5 MHz 2nd order HPF
AGC
Free
NF
5.5 dB
RSSI accuracy (absolute)
± 3 dB
RSSI accuracy (relative)
± 0.5 dB
Power consumption
~ 850 mW
www.nxp.com
© 2011 NXP Semiconductors N.V.
All rights reserved. Reproduction in whole or in part is prohibited without the prior written consent of the copyright owner. The
Date of release: July 2011
information presented in this document does not form part of any quotation or contract, is believed to be accurate and reliable and
Document order number: 9397 750 17142
may be changed without notice. No liability will be accepted by the publisher for any consequence of its use. Publication thereof
Printed in the Netherlands
does not convey nor imply any license under patent- or other industrial or intellectual property rights.
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