器件名称: U2740B
功能描述: UHF AM/FM Transmitter
文件大小: 264.88KB 共10页
简 介:U2740B
UHF AM/FM Transmitter
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 the Lock-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.
Features
D One-chip solution with few external components D Wide frequency range (200 to 500 MHz) D Single voltage supply (2.2 to 5.5 V) with power-down D D D D D D
feature Adjustable output power with differential output for loop antenna PLL lock-detect signal XTO output for C clock ESD protection according to MIL–STD. 883 (except Pins 1, 2, 13 and 14) Low standby current <0.25 mA for VS = 3 V Single lithium-cell operation
Applications
D D D D
Keyless entry (automotive, domestic,...) Alarm systems Remote control Communication systems
Ordering Information
Extended Type Number U2740B-BFP Package SO16 Remarks
System Block Diagram
1 Li cell VCO
U2740B
Antenna
Encoder
Keys
M44Cx9x
PLL
Power ampl.
XTO
RF–Transmitter
13350
Figure 1. System block diagram
TELEFUNKEN Semiconductors Rev. A3, 24-Feb-97
1 (10)
Preliminary Information
U2740B
Pin Descript……