u2745b ATMEL Corporation, u2745b Datasheet
u2745b
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u2745b Summary of contents
Page 1
... Electrostatic sensitive device. Observe precautions for handling. Description The U2745B is a PLL transmitter IC which has been especially developed for the demands of RF low-cost data transmission systems at data rates kBaud. The transmitting frequency range is 310 MHz to 440 MHz. It can be used in ASK sys- tems ...
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... PLL Antenna Antenna XTO VCO Power amp. ASK OR EN Power up VCC VCO CLK f GND 64 LFVCC U2745B UHF ASK Remote control receiver 1...3 Demod. Control IF Amp PLL XTO LNA VCO GND PWRSET PWRVCC PA ANT PWRGND1 PWRGND2 XTO XTO1 NC 4734A–RKE–11/03 ...
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... Power GND2 12 PWRGND1 Power GND1 13 ANT RF output 14 PWRVCC Supply voltage power amplifier 15 PWRSET Applied to VCC 16 GND Ground 4734A–RKE–11/03 ASK VCC 3 14 CLK 4 13 U2745B 5 GND 12 LFVCC 6 11 LFGND GND PWRSET PWRVCC ANT PWRGND1 PWRGND2 XTO1 NC U2745B 3 ...
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... The clock of the crystal oscillator can be used for clocking the microcontroller. The ATAR090 and ATAR890 have the special feature of starting with an integrated RC oscil- lator to switch on the U2745B with V present, so that the message can be sent with crystal accuracy. The following component values are recommendations for a typical application. C and C are block capacitors ...
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... ANT ASK Power VCC up 3 CLK VCO PA 4 GND LFVCC 6 f XTO LFGND U2745B U2745B Load-opt 2.2 ... 4 GND 16 PWRSET C Loop2 15 R PWRSET PWRVCC ANT Feed PWRGND1 Loop1 12 PWRGND2 11 13 ...
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... Output power variation for f = 315 MHz compared 433.92 MHz Maximum peak output antenna voltage Spurious emission Oscillator frequency XTO Loop bandwidth Phase noise PLL Phase noise VCO U2745B ° C, unless otherwise specified = amb = 2 4 Test Conditions £ 0 ...
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... C 10 CLK 100 modASK I 150 ol I 200 ol I -150 oh I -200 100 oh V 0.3 ASKl V 1.7 ASKh I 140 ASKh 0.3 FSKl V 1.7 FSKh I 140 FSKh U2745B Unit MHz MHz pF W kHz µA µA µA µ µ µA 7 ...
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... Ordering Information Extended Type Number U2745B-MFB U2745B-MFBG3 Package Information U2745B 8 Package Remarks SSO16 Tube SSO16 Taped and reeled 4734A–RKE–11/03 ...
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... Fax: (81) 3-3523-7581 Disclaimer: Atmel Corporation makes no warranty for the use of its products, other than those expressly contained in the Company’s standard warranty which is detailed in Atmel’s Terms and Conditions located on the Company’s web site. The Company assumes no responsibility for any errors which may appear in this document, reserves the right to change devices or specifications detailed herein at any time without notice, and does not make any commitment to update the information contained herein ...