U273B, U274, U2740B Selling Leads, Datasheet
MFG:TFK Package Cooled:CAN D/C:N/A
U273B, U274, U2740B
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Info of U273B
Info of U274
Info of U2740B
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About U2703
PDF/DataSheet Download
Datasheet: U2703
File Size: 182203 KB
Manufacturer: IRF [International Rectifier]
Download : Click here to Download
About U2740B
PDF/DataSheet Download
Datasheet: U2740B
File Size: 271242 KB
Manufacturer: TEMIC [TEMIC Semiconductors]
Download : Click here to Download
About U2740B
PDF/DataSheet Download
Datasheet: U2740B
File Size: 271242 KB
Manufacturer: TEMIC [TEMIC Semiconductors]
Download : Click here to Download
U2740B General 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 IC 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 is supplied to either an AM- or FM-input pin, the output power being set via the AM-input pin. A differential output enables simple applications with loop antennas. An output driver (XTO_out) can be used for clocking the microcontrolller.
U2740B Maximum Ratings
| 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 |
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 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
` 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
U2740B Typical Application
· Keyless entry (automotive, domestic,...)
· Alarm systems
· Remote control
· Communication systems
U2740B Connection Diagram
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