micrf112 Micrel Semiconductor, micrf112 Datasheet
micrf112
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micrf112 Summary of contents
Page 1
... General Description The MICRF112 is a high performance, easy to use, single chip ASK / FSK Transmitter IC for remote wireless applications in the 300 to 450MHz frequency band. This transmitter true “data-in, antenna-out” monolithic device. MICRF112 is high performance in three areas: delivery, operating voltage, and operating temperature. In terms of power, the MICRF112 is capable of delivering +10 dBm into a 50Ω ...
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... Micrel, Inc. Typical Application Note: Values in parenthesis are for 315MHz March 2008 Figure 1. MICRF112 ASK Key Fob Design 2 MICRF112 M9999-031008 (408) 944-0800 ...
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... ASK DATA Input Reference oscillator input connection. Reference oscillator output connection. Ground Reference oscillation modulation port for FSK operation. FSK Data Input Chip enable, active high PA Ground PA output Positive Power Supply 3 10 VDD 9 PAOUT 8 VSSPA FSK MICRF112 M9999-031008 (408) 944-0800 ...
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... EN = VDD. Bold values indicate –40°C to 125°C unless REFOSC SS = +10dBm OUT = +10dBm OUT Note 4 Note 4 Note 4 2nd harm. Note 4 3rd harm. Note 4 2nd harm. Note 4 3rd harm. 4 MICRF112 (Note 2) Min Typ Max Units .05 1µA µA 12 ...
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... Note 3. Devices are ESD sensitive. Handling precautions recommended. Human body model, 1.5k in series with 100pF. Note 4. Measured using Test Circuit in Figure 2. Note 5. Dependent on crystal Note 6. RBW = 100kHz, OBW measured at -20dBc. March 2008 ) MICRF112 Min Typ Max Units 0.8× 0.2×V DD 0.05 µA 0.05 µ ...
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... Note 1. Values without parenthesis are for 433.92 MHz and values in parenthesis are for 315MHz Note 100pF for external REF-OSC Note 3. For FSK R1 = 0Ω NP 100k, and March 2008 Figure 2. MICRF112 Test Circuit with 50Ω Output 6 MICRF112 M9999-031008 (408) 944-0800 ...
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... Micrel, Inc. Assembly Drawing MICRF112 50 Ohm Test Board Bottom Layer MICRF112 50 Ohm Test Board March 2008 Top Layer MICRF112 50 Ohm Test Board 7 MICRF112 M9999-031008 (408) 944-0800 ...
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... Micrel, Inc. Typical Characteristics Using MICRF112, 50Ω test Board 315MHz OBW, ASK = 1kHz CW Max Power @ 3V, 315MHz, ASK = 1kHz, Note Spectrum 3 Fundamental at 315 MHz Note 1. 1.2dB cable loss. March 2008 Harmonic; 8 315Mhz OBW, ASK = 50kHz nd RF Spectrum 2 Harmonic; Fundamental at 315 MHz 315MHz, Power Level at Space, VDD = 3 ...
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... Phase Noise, ASK = 1kHz, 100kHz Offset, –75.59dBc/Hz 315MHz, Phase Noise, ASK = CW, 100kHz Offset, –74.39dBc/Hz March 2008 315MHz, Zero Span, ASK = 50kHz 315MHz, Phase Noise, ASK = 1khz, 1MHz Offset, –78.99dBc/Hz 315MHz, Phase Noise, ASK = CW, 1MHz Offset, –77.28dBc/Hz 9 MICRF112 M9999-031008 (408) 944-0800 ...
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... OBW, ASK = 1kHz 433.92MHz, CW Max Power @ 3V, ASK = 1kHz, Note Spectrum 3 Fundamental at 433.92 MHz Note 1. 1.3dB cable loss. March 2008 Harmonic; 10 433.92MHz OBW, ASK = 50kHz nd RF Spectrum 2 Harmonic; Fundamental at 433.92 MHz 433.92MHz Power Level at Space, VDD = 3.0V, ASK = 1kHz MICRF112 M9999-031008 (408) 944-0800 ...
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... Phase Noise, ASK = CW, 100kHz Offset, –81.04dBc/Hz 433.92MHz Phase Noise, ASK = 1kHz, 100kHz Offset, –71.73dBc/Hz March 2008 433.92ASK Zero Span at 50kHz 433.92MHz Phase Noise, ASK = CW, 1MHz Offset, –78.76dBc/Hz 433.92MHz Phase Noise, ASK = 1kHz, 1MHz Offset, –81.04dBc/Hz 11 MICRF112 M9999-031008 (408) 944-0800 ...
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... Micrel, Inc. Functional Diagram Figure 3. Functional Block Diagram MICRF112 10 Pin ASK / FSK Version Functional Description Figure 3 shows a functional block diagram of the MICRF112 transmitter. The MICRF112 can be best described as a phase locked transmitter. The system can be partitioned into six functional blocks; crystal oscillator, PLL× ...
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... Micrel, Inc. Crystal Oscillator for FSK Operation Figure 5 shows reference oscillator circuit configuration for FSK operation. To operate the MICRF112 in FSK mode, one additional capacitor is needed between XTALOUT pin and XTALMOD pin. Crystal parameters for FSK operation are the same as ASK operation except: • ...
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... Micrel, Inc. Application Information Note: Values in parenthesis are for 315MHz The MICRF112 is well suited to drive a 50 ohms source, monopole or a loop antenna. Figure example of a loop antenna configuration. Figure 6 also shows both 315MHz and 433.92MHz ASK configurations for a loop antenna. Besides using a different crystal, Table 1 lists modified values needed for the listed frequencies ...
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... Directivity is affected by antenna trace layout. No ground plane should be under the antenna trace. For consistent performance, components should not be placed inside the loop of the antenna. Gerbers for Figure 7, with a suggested layout, can be obtained on the Micrel web site at: http://www.micrel.com. 15 MICRF112 M9999-031008 (408) 944-0800 ...
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... Micrel, Inc. PCB Board Assembly Drawing MICRF112 Demo Board Bottom Layer MICRF112 Demo Board March 2008 Figure 7. Demo Board PCB 16 MICRF112 Top Layer MICRF112 Demo Board M9999-031008 (408) 944-0800 ...
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... Micrel, Inc. Note: Configuration is for ASK operation. Values in parenthesis are for 315MHz March 2008 Figure 8. TX112-1 Demo Board Schematic 17 MICRF112 M9999-031008 (408) 944-0800 ...
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... MICRF112YMM10 13.560MHZ XTAL Table 2 18 MICRF112 Mfg P/N Manufacturer GRM21BR60J106KE01L muRata GRM1885C1H101JA01D muRata GRM1885C1H100JA01D muRata GRM1885C1H4R7JA01D muRata GRM188F51H104ZA01D muRata GRM1885C1H180JA01D muRata TSHR-114-S-02-A-GT 0805CS-680XJB Coilcraft 0603CS-082NXJB Coilcraft ANTENNA LOOP, Part of PCB CRCW0603100KFKEA Vishay CRC06030000Z0EA Vishay MICRF112YM Micrel SA-13.5600-F-10-C-3-3 M9999-031008 (408) 944-0800 HIB ...
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... Table 5: Enable Control (Shutdown) 19 MICRF112 Mfg P/N Manufacturer GRM21BR60J106KE01L GRM1885C1H101JA01D GRM1885C1H1000JA01D GRM1885C1H6R8JA01D GRM188F51H104ZA01D GRM1885C1H180JA01D TSHR-114-S-02-A-GT 0805CS-470XJB 0603CS-R15XJB ANTENNA LOOP, Part of PCB CRCW0603100KFKEA CRC06030000Z0EA MICRF112YM SA-9.84375-F-10-C-3-3 JPR2 0Ω (1)3.3pF (2)10pF R4 NP 100kΩ M9999-031008 (408) 944-0800 muRata muRata muRata muRata muRata ...
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... Purchaser’s use or sale of Micrel Products for use in life support appliances, devices or systems is at Purchaser’s own risk and Purchaser agrees to fully indemnify Micrel for any damages resulting from such use or sale. March 2008 10-Pin MSOP Package Type (YMM10) © 2007 Micrel, Incorporated. 20 MICRF112 nt M9999-031008 (408) 944-0800 ...