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• 16C554的PDF下载
• 16C554的说明(Description)
• 16C554的全国供应商
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The 7B33 is a single-channel signal conditioning module that interfaces, amplifies and filters unipolar voltage inputs and provides a protected precision output of either +1 V to +5V or 0 V to +10 V. To measure a process current input, a plug-on 250Ω current sensing resistor, Model AC1391, may be installed directly on the 7B backplane, using available pin sockets. The external current sense resistor allows the current loop to be maintained even when the module is removed from the backplane. Model 7B33 features a nonlinearity of +0.02% maximum and an accuracy of +0.1% maximum (+0.01% typical). To accurately measure low level signals in electrically noisy environments, 1500 V rms of galvanic transformer-based isolation with a common mode rejection (CMR) of 105 dB @ 50/60 Hz is provided. Rated to operate with a nominal +24 VDC supply, Model 7B33 is mix-and-match and hot-swappable with other 7B Series input modules, so it can be inserted or removed from any socket in the same backplane without disturbing system power.

The two input pins of Model 7B33 are fully protected up to 120 V rms line voltage. A one-pole 100 Hz filter preconditions the input signal prior to amplification by a low drift input amplifier.

Amplitude modulation is used to implement transformer isolation (1500 V rms input-to-output and power). Isolated front-end circuitry power is supplied by a DC/DC converter. The output section contains a two-pole low pass filter (-3 dB @ 100 Hz), a buffer amplifier and a power oscillator. The two-pole output filter and subsequent buffer ensures that a low noise, low impedance (<1Ω) signal is available at the output to drive loads of 2 kΩ minimum.

The LMX2240 is a monolithic, integrated intermediate frequency receiver suitable for use in Digital European Cordless
Telecommunications (DECT) systems as well as other mobile telephony and wireless communications applications. It is fabricated using National's ABiCTM IV BiCMOS process (fT = 15 GHz).

The LMX2240 consists of a high gain limiting amplifier, a frequency discriminator, and a received signal strength indicator (RSSI). The high gain limiting amplifier and discriminator operate in the 40 MHz to 150 MHz frequency range, and the limiter has approximately 70 dB of gain.

The use of the limiter and the discriminator provides a low cost, high performance demodulator for communications systems.

The RSSI output can be used for channel quality monitoring.

The LMX2240 is intended to support single conversion receivers.
This device saves power, size, and cost by eliminating the second local oscillator (LO), second converter (mixer), and additional filters. The LMX2240 is recommended for systems with channel bandwidths of 300 kHz to 2.5 MHz.

The LMX2240 is available in a 16-pin JEDEC surface mount plastic package.