MT2121 MICROTUNE | Alldatasheet
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Technical content
RF SILICON AND SUBSYSTEMS SOLUTIONS FOR BROADBAND COMMUNICATIONS AND AUTOMOTIVE ELECTRONICS M I C R O T U N E M I C R O T U N E® MT2121 SINGLE-CHIP BROADBAND TUNER PRODUCT BRIEF The MT2121 has been optimized for high-performance analog and digital cable set-top boxes, supporting the
48 MHz to 1 GHz range of the cable
spectrum. The MicroTuner™ MT2121 is a fully integrated single-chip tuner, with functional blocks specifically designed to ease implementation of an OpenCable™ - compliant set-top box (STB). The MT2121 contains integrated filter components and controls that allow for a simple, alignment-free pre-select filter. This provides excellent end-to-end linearity performance for severely sloped input conditions. The tuner also has an on-chip amplifier for Forward Data Channel (FDC) applications, reducing bill of materials (BOM) and improving performance-versus-solutions based on a directional coupler.
APPLICATIONS
All cable-based applications Advanced analog/digital set-top boxes including OpenCable Residential gateways Home entertainment servers
FEATURES
- Dual-conversion architecture for consistent performance with no manual alignments
- Proven performance in dual- function analog and digital set-top box designs
- Eliminates the need for the 28V to 33V supplies typically required by traditional cable tuners
- 3.3V and 5V serial bus compatible
- Minimal external components; simple interface to external filters
- Software shutdown mode
- Small 8mm x 8mm 56-lead QFN Quad Flat package available in lead-free
- Can be used in conjunction with Microtune’s upstream amplifiers to create a complete RF front end for bi-directional set-top box applications MT2121 Single-Chip Broadband Tuner
MT2121 SINGLE-CHIP BROADBAND TUNER PRODUCT BRIEF MT2121 PB-00067 — Rev 1.2 DECEMBER 2005 Microtune, Inc., 2201 Tenth Street, Plano, TX 75074, USA Tel: +1-972-673-1600, Fax: +1-972-673-1602, E-mail: sales@microtune.com, Web site: www.microtune.com For a detailed list of design centers, sales offices, and sales representatives, visit our Web site at www.microtune.com. The information in this document is believed to be accurate and reliable. Microtune assumes no responsibility for any consequen ces arising from the use of this information, nor from any infringement of patents or the rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent o r other rights of Microtune. The information in this publication replaces and supersedes all information previously supplied, and is subject to change without notice. The customer is responsible for assuring that pro per design and operating safeguards are observed to minimize inherent and procedural hazards. Microtune assumes no responsibility for applications assistance or customer product design. The devices described in this document are not authorized for use in medical, life-support equipment, or any other application involving a potential risk of severe property or environmental damage, personal injury, or death without prior express written approval of Microtune. Any such use is understood to be entirely at the user’s risk. Microtune is a registered trademark of Microtune, Inc. MicroTuner, MicroStreamer, VideoCaster, DataCaster, and the Microtune logo are trademarks of Microtune, Inc. All other tradema rks belong to their respective companies. Microtune’s products are protected by one or more of the following U.S. patents: 5,625,325; 5,648,744; 5,717,730; 5,737,035; 5, 739,730; 5,805,988; 5,847,612; 6,100,761; 6,104,242; 6,163,684; 6,169,569; 6,784,945; 6,804,099; 6,888,406; 6,891,435; 6,906,594; 6,909,886; 6,920,182; 6,963,478; D,469,742 and additional patents pendin g or filed. Entire contents Copyright © 1996 - 2005 Microtune, Inc. 110805 RECOMMENDED OPERATING CONDITIONS
ELECTRICAL CHARACTERISTICS
PARAMETER C ONDITION T YPICAL Power supply 5.0V 270 mA 3.3V 80 mA Noise figure, max RF gain, at FGA output At max RF AGC. Measured at FGA output. FDC not used. 10.6 dB Input return loss Referred to 75Ω 9 dB RF gain range 0V to 3.3V control voltage 30 dB IF gain range 0.7V to 3.3V control voltage 30 dB Image rejection Undesired 90 MHz higher in frequency. -75 dBc 1kHz -75 dBc/Hz 10kHz -85 dBc/Hz Phase noise 100kHz -105 dBc/Hz Serial control clock frequency 400 kHz Noise figure, max RF gain and IF gain, at VGA output RFAGC at 3.3V. Measured at VGA output with FDC connected. 10.9 dB ABSOLUTE MAXIMUM RATINGS PARAMETER M IN MAX U NIT Supply voltage 5.25 V Storage temperature range -40 +150 °C Lead temperature (soldering 4 seconds) +245 °C Lead free temperature (soldering 4 seconds) +250 °C Input voltage -0.3 VCC +0.3 V 48-1000 MHz In PLL PLL OOB Tuner Pin Diode Atten Loop Filter Loop Filter Charge Pump Charge Pump 3-bit AD GPO Selectable Preslector Filter Serial Bus Mix 2 Output VGA Output 2nd IF Saw1st IF Saw FDC IF Gain Control RF Gain Control Pin Diode Controller AFC In/Temp Out Buffered Reference Output Input Balun Die Temp Sensor PARAMETER M IN TYP M AX U NIT Input range 48 1000 MHz First intermediate center frequency 1220 MHz Second intermediate center frequency (programmable) 30 57 MHz Supply voltage, 5V 4.75 5.25 V Supply voltage, 3.3V 3.15 3.45 V Supply voltage ripple 15 mV MIX 2 IF output load impedance 800 Ω Serial control clock 400 kHz MT2121 Block Diagram MT2121 Pin Diagram HBinp 1 HBshp 2 LBshp 3 LBinp 4 FDCin 5 FDCVcc 6 FDCout 7 LO1tcm1 8 LO1tcm2 9 LO1reg 10 VCCLO1 11 LO1LPF 12 GPO 13 A1 14 A0 15 DVCCLO1 16 SerCLK 17 SerData 18 SerVCC 19 XTALn 20 XTALp 21 SROVCC 22 SROOUT 23 DVCCLO2 24 VGAOUTp 25 VGAOUTn 26 VGAVCC 27 VGAVCC 28