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U2740B

Features: ` One-chip solution with few external components` Wide frequency range (200 to 500 MHz)` Single voltage supply (2.2 to 5.5 V) with power-down feature` Adjustable output power with differential output for loop antenna` PLL lock-detect signal` XTO output for mC clock` ESD protection accord...

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U2740B: Features: ` One-chip solution with few external components` Wide frequency range (200 to 500 MHz)` Single voltage supply (2.2 to 5.5 V) with power-down feature` Adjustable output power with differen...

U2740B Data Sheet

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Part Number:
U2740B
Supply Ability:
5000

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  • 1~5000
  • Unit Price
  • Negotiable
  • Processing time
  • 15 Days
Total Cost: $ 0.00

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Product Details

Description



Features:

` One-chip solution with few external components
` Wide frequency range (200 to 500 MHz)
` Single voltage supply (2.2 to 5.5 V) with power-down feature
` Adjustable output power with differential output for loop antenna
` PLL lock-detect signal
` XTO output for mC clock
` ESD protection according to MILSTD. 883 (except Pins 1, 2, 13 and 14)
` Low standby current <0.25   A for VS = 3 V
` Single lithium-cell operation

 




Application

· Keyless entry (automotive, domestic,...)
· Alarm systems
· Remote control
· Communication systems




Pinout

Connection Diagram


Specifications

Parameters
Symbol
Min.
Max.
Unit
Supply voltage Pin 12
VS
0.3
5.5
V
Voltage at Pins 13 and 14
0.3
10
V
Input current AM_in Pin 16
0.75
mA
Output current lock detect Pin 4
1.5
mA
Output current XTO_out Pin 10  
1.5
mA
Junction temperature
Tj
125
Storage temperature
Tstg
0.3
125



Description

The U2740B-B is an one-chip multi-purpose UHF ASK/FSK transmitter IC designed for various applications within a wide frequency range. When a Chip-Select (CS) signal is supplied, the U2740B starts operation (Power-up, XTO, VCO, PD) and the VCO is then locked to 128 × f(XTO). The locked status is indicated at theLock-Detect (LD) output.

The digital data of U2740B is supplied to either an AM- or FM-input pin, the output power being set via the AM-input pin. A differential output of U2740B enables simple applications with loop antennas. An output driver (XTO_out) can be used for clocking the microcontrolller.




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