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U2740B

器件名称: U2740B
功能描述: UHF AM/FM Transmitter
文件大小: 264.88KB    共10页
生产厂商: TEMIC
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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……
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