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LMX5252 Datasheet(PDF) 7 Page - Texas Instruments |
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LMX5252 Datasheet(HTML) 7 Page - Texas Instruments |
7 / 41 page LMX5252 www.ti.com SNOSCW4A – DECEMBER 2004 – REVISED APRIL 2013 TRANSMITTER PERFORMANCE CHARACTERISTICS PARAMETER CONDITION MIN TYP(1) MAX UNIT 2.402 GHz –3 +1 +3 dBm POUTRF (2) Transmit output power 2.441 GHz –3 +1 +3 dBm 2.480 GHz –3 +1 +3 dBm Power Density(3) Power density –4 1 2 dBm MOD ∆F1AVG Data = 00001111 140 165 175 kHz MOD ∆F2MAX (4) Modulation characteristics Data = 10101010 115 125 kHz ∆F2AVG/∆F1AVG (5) 0.8 20 dB Bandwidth 1000 kHz | M - N | = 2 –48 –20 dBm ACP(3) Adjacent channel power (In-band spurious) | M - N | ≥ 3 –51 –40 dBm Maximum gain setting: POUT2×fo (6) PA 2nd Harmonic suppression f0 = 2402 MHz, –30 dBm Pout = 4804 MHz Maximum gain setting: POUT3×fo (3) PA 3rd Harmonic suppression f0 = 2402 MHz, –30 dBm Pout = 7206 MHz RF Output/Input Impedance of RF Port ZRFOUT (7) Pout at 2.4 GHz 47 Ω (RF_inout) Return Loss(3)(8) Return Loss –14 dB (1) Typical operating conditions are at VCC = 2.75V. (2) The output power is measure at the device interface. (3) Not tested in production. (4) ΔF2max > 115 kHz for at least 99.9% of all ΔF2max. (5) Modulation index set between 0.28 and 0.35. (6) Out-of-Band spurs only exist at 2nd and 3rd harmonics of the CW frequency for each channel. (7) Reference Table 1. (8) Reference Table 4. SYNTHESIZER PERFORMANCE CHARACTERISTICS PARAMETER CONDITION MIN TYP MAX UNIT fVCO VCO Frequency range 5000 MHz tLOCK Lock time f0 ± 50 kHz 120 µs ∆f0offset (1) (2) Initial carrier frequency tolerance During preamble –75 0 75 kHz ∆f0drift (1) (2) Initial carrier frequency drift DH1 data packet –25 0 25 kHz DH3 data packet –40 0 40 kHz DH5 data packet –40 0 40 kHz Drift Rate –20 0 20 kHz/50µs tD -Tx Transmitter delay time From Tx data to antenna 4 µs (1) Frequency accuracy is dependent on crystal oscillator chosen. The crystal must have a cumulative accuracy of < ±20ppm to meet Bluetooth specifications. (2) Not tested in production. CRYSTAL REQUIREMENTS The LMX5252 contains a crystal driver circuit. This circuit operates with an external crystal and capacitors to form an oscillator. Figure 1 shows the recommended crystal circuit. Figure 3 specifies system clock requirements. The RF local oscillator and internal digital clocks for the LMX5252 is derived from the reference clock at the CLK+ input. This reference may either come from an external clock or a dedicated crystal oscillator. The crystal oscillator connections require an Xtal and two grounded capacitors.Ÿ Copyright © 2004–2013, Texas Instruments Incorporated Submit Documentation Feedback 7 Product Folder Links :LMX5252 |
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