U2745B-MFB

U2745B-MFB Datasheet


U2745B

Part Datasheet
U2745B-MFB U2745B-MFB U2745B-MFB (pdf)
Related Parts Information
U2745B-MFBG3 U2745B-MFBG3 U2745B-MFBG3
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• Very High Transmitting Frequency Accuracy Compared to SAW Solutions Enables Receivers at Lower Bandwidth than with SAW Resonators
• Lower Cost than the Usual Discrete Solutions Using SAW and Transistors
• Supply Voltage V to V in the Temperature Range of -40°C to 85°C
• XTO Output for Clocking the Microcontroller, Thereby Together with the ATAR090 or

ATAR890 Results in the Optimum System Cost-effectiveness
• One-chip Solution with Minimum External Circuitry
• Very Small SSO16 Package, Pitch 150 mil
• “Single-ended Open-collector” Output Same Antennas Can Be Used as in Discrete

Solutions, Simpler Adaptation of Magnetic Loop Antennas
• ESD Protection According to MIL-STD.883 4 KV HBM Except Pins XTO1/ 2,

ANT and LF

Electrostatic sensitive device. Observe precautions for handling.

UHF ASK Transmitter

U2745B

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 up to 20 kBaud.

The transmitting frequency range is 310 MHz to 440 MHz. It can be used in ASK systems. The main applications of the U2745B are in the areas of outside temperature metering, socket control, garage door opener, consumption metering, light/fan or aircondition control, jalousies, wireless keyboard and various other consumer market applications.

Microcontroller

Figure System Block Diagram
1 Li cell

Encoder Keys ATARx9x

UHF ASK Remote control transmitter

UHF ASK Remote control receiver

U2745B

U3745BM

Demod.

Control

PLL VCO

Antenna

IF Amp PLL

Power amp.

Figure Block Diagram

ASK EN

VCC CLK GND LFVCC LFGND

Power up

U2745B

PA XTO

GND PWRSET PWRVCC ANT PWRGND1 PWRGND2 XTO1 NC
2 U2745B

Pin Configuration

Figure Pinning SSO16

ASK 1 EN 2

VCC 3 CLK 4 GND 5 LFVCC 6 LFGND 7
16 GND
15 PWRSET
14 PWRVCC

U2745B
13 ANT 12 PWRGND1 11 PWRGND2
Ordering Information

Extended Type Number U2745B-MFB U2745B-MFBG3

Package Information

Package SSO16

Remarks Tube Taped and reeled
8 U2745B

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Literature Requests

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Datasheet ID: U2745B-MFB 519471