U2741B-NFBY

U2741B-NFBY Datasheet


U2741B

Part Datasheet
U2741B-NFBY U2741B-NFBY U2741B-NFBY (pdf)
Related Parts Information
U2741B-NFB U2741B-NFB U2741B-NFB
U2741B-NFBG3 U2741B-NFBG3 U2741B-NFBG3
U2741B-NFBG3Y U2741B-NFBG3Y U2741B-NFBG3Y
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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 -20°C to 70°C

Supply Voltage V to V in the Temperature Range -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 as in Discrete Solutions Can

Be Used, Simpler Adaptation of Magnetic Loop Antennas
• Very Large FSK Frequency Deviation Achievable by ±100 ppm Pulling of the Reference

Crystal
• Enables Receivers at Lower Bandwidth than with SAW Resonators
• ESD Protection According to MIL-STD.883 4 KV HBM Except Pins XTO1/ 2,

ANT and LF

UHF ASK/FSK Transmitter

U2741B

Electrostatic sensitive device. Observe precautions for handling.

The U2741B 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 300 MHz to 450 MHz. The device can be used in both FSK and ASK systems.

Microcontroller

Figure System Block Diagram
1 Li cell

Encoder Keys ATARx9x

UHF ASK/FSK Remote control transmitter

UHF ASK/FSK Remote control receiver

U2741B

U3741BM

Demod.

Control

PLL VCO

Antenna

IF Amp PLL

Power amp.

Figure Block Diagram

ASK FSK VCC CLK GND LFVCC LFGND

Power up

U2741B

PA XTO

DIVC PWRSET PWRVCC ANT PWRGND1 PWRGND2 XTO1 XTO2
2 U2741B

Pin Configuration

Figure Pinning SSO16

ASK 1 FSK 2 VCC 3 CLK 4 GND 5 LFVCC 6 LFGND 7

U2741B
16 DIVIC 15 PWRSET 14 PWRVCC 13 ANT 12 PWRGND1 11 PWRGND2 10 XTO1 9 XTO2

Pin Description

LFVCC

LFGND

XTO2
Ordering Information

Extended Type Number U2741B-NFB U2741B-NFBG3

Package Information

Package SSO16

Remarks

Tube, optimized power-supply rejection, value of C4 differs from M-version, enhanced XTO stability

Taped and reeled, see above
8 U2741B

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Literature Requests

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Datasheet ID: U2741B-NFBY 519470