TH7122ENE Melexis Inc, TH7122ENE Datasheet
TH7122ENE
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TH7122ENETR
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TH7122ENE Summary of contents
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Features Single chip solution with only a few external components Stand-alone fixed-frequency user mode Programmable multi-channel user mode Low current consumption in active mode and very low standby current PLL-stabilized RF VCO (LO) with internal varactor diode Lock detect output ...
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Document Content 1 Theory of Operation ...................................................................................................4 1.1 General ............................................................................................................................. 4 1.2 Technical Data Overview.................................................................................................. 4 1.3 Note on ASK Modulation .................................................................................................. 4 1.4 Block Diagram .................................................................................................................. 5 1.5 User Mode Features ......................................................................................................... 5 2 Pin Definitions and Descriptions ..............................................................................6 ...
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Register Overview .......................................................................................................... 21 5.1.1 Default Register Settings for FS0, FS1...................................................................................... 21 5.1.2 A – word ..................................................................................................................................... 22 5.1.3 B – word ..................................................................................................................................... 23 5.1.4 C – word..................................................................................................................................... 24 5.1.5 D – word..................................................................................................................................... 25 6 Technical Data..........................................................................................................26 6.1 Absolute ...
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Theory of Operation 1.1 General The main building block of the transceiver is a programmable PLL frequency synthesizer that is based on an integer-N topology. The PLL is used for generating the carrier frequency during transmission and for generating ...
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Block Diagram MIX IN_LNA LNA counter ASK VCO OUT_PA PA 25 PS_PA TNK_LO 1.5 User Mode Features The transceiver can operate in two different user modes. It ...
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Pin Definitions and Descriptions Pin No. Name I/O Type 1 IN_IFA input 2 VCC_IF supply 3 IN_DEM analog I/O 4 INT2/PDO output 5 INT1 input 6 OUT_DEM analog I/O 7 RSSI output 39010 07122 Rev. 010 Functional Schematic VCC ...
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Pin No. Name I/O Type 8 OUT_DTA output 9 VEE_RO ground 10 RO analog I/O 11 FSK_SW analog I/O 12 IN_DTA input 13 ASK/FSK input 14 VCC_DIG supply 15 RE/SCLK input 16 TE/SDTA input 39010 07122 Rev. 010 FSK/FM/ASK Transceiver ...
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Pin No. Name I/O Type 17 FS0/SDEN input 18 VEE_DIG ground 19 FS1/LD input / output 20 VCC_PLL analog I/O 21 TNK_LO analog I analog I/O 22 VEE_PLL ground 24 PS_PA analog I/O 25 OUT_PA output 39010 07122 ...
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Pin No. Name I/O Type 27 VEE_LNA ground 28 OUT_LNA output 26 IN_LNA input 29 GAIN_LNA input 30 IN_MIX input 31 VEE_IF ground 32 OUT_MIX output 39010 07122 Rev. 010 FSK/FM/ASK Transceiver Functional Schematic OUT_LNA bias 28 37 VEE 3.8k ...
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Functional Description 3.1 PLL Frequency Synthesizer The TH7122 contains an integer-N PLL frequency synthesizer. A PLL circuit performs the frequency synthe- sis via a feedback mechanism. The output frequency f detector comparison frequency crystal oscillator. ...
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Reference Oscillator (XOSC) The reference oscillator is based on a Colpitts topology with two integrated functional capacitors as shown in figure 3. The circuitry is optimized for a load capacitance range pF. The equivalent ...
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Crystal Frequency frequency f resolution f RO 3.0000MHz 2.93kHz 3.0000MHz 2.93kHz 8.0000MHz 12.5kHz 8.0000MHz 25kHz 8.0000MHz 250kHz 3.1.5 Phase-Frequency Detector The phase-frequency detector creates an error voltage proportional to the phase difference between the reference signal f and f . ...
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The CNT_ER supervises the unlock condition and Down are consecutive, the counter CNT_ER will be reloaded permanently and its CARRY will not be set, otherwise the counter level of CNT_ER will be reduced by the reference oscillator clock ...
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LNA The LNA is based on a cascode topology for low-noise, high gain and good reverse isolation. The open col- lector output has to be connected to an external resonance circuit which is tuned to the receive frequency. The ...
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FSK Demodulator The implemented FSK demodulator is based on the phase-coincidence principle. A discriminator tank, which can either consist of a ceramic discriminator tank, is connected to pin IN_DEM. If FSK mode is selected SW1 is ...
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Output Power Adjustment The maximum output power is adjustable via the external resistor RPS as shown in Figure 8. There are four predefined power settings in programmable user mode which can be set in the register TXPOWER. The maxi- ...
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FSK Modulation • FSK modulation via crystal pulling FSK modulation can be achieved by pulling the crystal oscillator frequency. A CMOS-compatible data stream applied at pin IN_DTA digitally modulates the XOSC via an integrated NMOS switch. Two external pulling ...
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Description of User Modes 4.1 Stand-alone User Mode Operation After power up the transceiver is set to stand-alone user mode. In this mode, pins FS0/SDEN and FS1/LD must be connected must not be ...
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Modulation Type Modulation type ASK / FSK 4.1.4 LNA Gain Mode LNA gain GAIN_LNA 4.2 Programmable User Mode Operation The transceiver can also be used in programmable user mode. After power-up the first logic change at pin FS0/SDEN enters ...
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Due to the static CMOS design, the SCI consumes virtually no current and it can be programmed in active as well as in standby mode. If the transceiver is set from standby mode to any of the active modes (idle, ...
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Register Overview WORD MSB ...
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A – word Name Bits [9: 1023d 00 [11:10] OPMODE [12] LNAGAIN 1 [13] not used 00 [15:14] TXPOWER [16] PACTRL [17] LOCKMODE 1 [18] CPCUR ...
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B – word Name Bits [9: 1023d 000 001 010 [12:10] ROMIN 011 100 101 110 111 000 001 010 [15:13] ROMAX 011 100 101 110 111 0 [16] OA2 1 0 [17] AFC 1 [18] ...
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C – word Name Bits [16:0] NR 64d .. 131071d 0 [17] BAND 1 00 [19:18] VCOCUR [20] PFDPOL 1 0 [21] LNACTRL 1 39010 07122 Rev. 010 Description Feedback divider ratio in RX operation ...
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D – word Name Bits [16:0] NT 64d .. 131071d 00 [18:17] ERTM [20:19] LDTM [21] MODCTRL 1 39010 07122 Rev. 010 Description Feedback divider ratio in TX operation mode Set ...
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Technical Data 6.1 Absolute Maximum Ratings Operation beyond absolute maximum ratings may cause permanent damage of the device. Parameter Supply voltage Input voltage Input RF level Storage temperature Junction temperature Power dissipation Thermal Resistance Electrostatic discharge Electrostatic discharge 1) ...
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DC Characteristics all parameters under normal operating conditions, unless otherwise stated; typical values °C and V A Parameter Operating currents Standby current Reg. BAND Idle current 1 (> 500 MHz) 1 (> 500 MHz) 0 ...
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Parameter Digital pin characteristics Pull-down Resistor pins IN_DTA , RE/SCLK, TE/SDTA Low level input leakage current pins IN_DTA, ASK/FSK, RE/SCLK, TE/SDTA, FS0/SDEN, FS1/LD High level input leakage current pins ASK/FSK, FS0/SDEN, FS1/LD Analog pin characteristics MOS switch On resistance FSK_SW ...
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PLL Synthesizer Timings Parameter wide band Channel switching time narrow band TX – RX switching time 6.5 AC Characteristics of the Receiver Part all parameters under normal operating conditions, unless otherwise stated; typical values °C ...
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AC Characteristics of the Transmitter Part all parameters under normal operating conditions, unless otherwise stated; typical values °C and V a all parameters based on test circuits for FSK (Fig 15) and ASK ...
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Application Circuit Examples 7.1 FSK Application Circuit Programmable User Mode (internal AFC option) RX_IN CB2 TX_OUT LTX0 CTX0 Combining network CRX0 CB1 RB1 Fig. 14: Test circuit for FSK operation in Programmable User Mode (internal AFC ...
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FSK Application Circuit Stand-alone User Mode RX_IN CB2 TX_OUT LTX0 CTX0 Combining network CRX0 CB1 RB1 Fig. 15: Test circuit for FSK operation in Stand-alone User Mode 39010 07122 Rev. 010 CF1 CF2 RF CB6 C0 ...
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FSK Test Circuit Component List (Fig. 14 and Fig. 15) Value @ Part Size 315 MHz 433.92 MHz C0 0603 1 0603 3 0603 1 0603 0603 330 pF C5 ...
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ASK Application Circuit Programmable User Mode (normal data slicer option) RX_IN CB2 TX_OUT LTX0 CTX0 Combining network CRX0 CB1 RB1 Fig. 16: Test circuit for ASK operation in Programmable User Mode (normal data slicer option) Software ...
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ASK Test Circuit Component List (Fig. 16) Value @ Part Size 315 MHz C0 0603 1 0603 3 0603 1 0603 0603 1.5 nF CB0 1210 10 μF CB1 0603 ...
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ASK Application Circuit Programmable User Mode (peak detector option) RX_IN CB2 TX_OUT LTX0 CTX0 Combining network CRX0 CB1 RB1 Fig. 17: Test circuit for ASK operation in Programmable User Mode (internal Peak Detector option) Software Settings ...
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ASK Test Circuit Component List (Fig. 17) Value @ Part Size 315 MHz C0 0603 1 0603 3 0603 1 0603 1 0603 100 nF CB0 1210 10 μF CB1 0603 ...
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Extended Frequency Range The operating frequency range of 300 MHz to 930 MHz can be covered without the use of an additional VCO varactor diode. A frequency range extension down to 27 MHz can be realized by adding an ...
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TX/RX Combining Network 9.1 Board Component List (Fig. 19) Value @ Value @ Part Size 315 433.92 MHz MHz CRX0 0603 100 pF 100 pF CTX0 0603 CTX1 0603 10 pF 6.8 pF CTX2 0603 ...
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LNA Input Impedances in Transmit Mode Mode Frequency R S 33.6 Ω 27 MHz 33.6 Ω 40 MHz 33.6 Ω 80 MHz 34.3 Ω 170 MHz 39010 07122 Rev. 010 LNA off, Pin LNA is shorted L Frequency R ...
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Package Description The device TH7122 is RoHS compliant 12° Fig. 4: All Dimension in mm, coplanaríty < 0.1mm E1 min 7.00 9.00 max All Dimension in inch, coplanaríty < 0.004” min ...
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Reliability Information This Melexis device is classified and qualified regarding soldering technology, solderability and moisture sensitivity level, as defined in this specification, according to following test methods: Reflow Soldering SMD’s (Surface Mount Devices) • IPC/JEDEC J-STD-020 “Moisture/Reflow Sensitivity Classification ...
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Your Notes 39010 07122 Rev. 010 FSK/FM/ASK Transceiver Page TH7122 27 to 930MHz Data Sheet Feb/09 ...
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Disclaimer 1) The information included in this documentation is subject to Melexis intellectual and other property rights. Reproduction of information is permissible only if the information will not be altered and is accompanied by all associated conditions, limitations and ...