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MAAD-000523 Datasheet(PDF) 5 Page - M/A-COM Technology Solutions, Inc. |
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MAAD-000523 Datasheet(HTML) 5 Page - M/A-COM Technology Solutions, Inc. |
5 / 7 page Digital Attenuator, 6-Bit, Serial / Parallel Control 31.5 dB, 0.7 - 6.0 GHz Rev. V2 MAAD-000523 5 • North America Tel: 800.366.2266 • Europe Tel: +353.21.244.6400 • India Tel: +91.80.43537383 • China Tel: +86.21.2407.1588 Visit www.macomtech.com for additional data sheets and product information. M/A-COM Technology Solutions Inc. and its affiliates reserve the right to make changes to the product(s) or information contained herein without notice. ADVANCED: Data Sheets contain information regarding a product M/A-COM Technology Solutions is considering for development. Performance is based on target specifications, simulated results, and/or prototype measurements. Commitment to develop is not guaranteed. PRELIMINARY: Data Sheets contain information regarding a product M/A-COM Technology Solutions has under development. Performance is based on engineering tests. Specifications are typical. Mechanical outline has been fixed. Engineering samples and/or test data may be available. Commitment to produce in volume is not guaranteed. Functionality Modes of Operation: Serial, Direct Parallel, and Latched Parallel Mode Truth Table P/S LE Mode 1 X Serial 0 Constant High Direct Parallel 0 Pulsed Latched Parallel Serial Mode Direct Parallel Mode Latched Parallel Mode The serial control interface (SERIN, CLK, LE, SEROUT) is compatible with the SPI protocol. SPI mode is activated when P/S is kept high. The 6-bit serial word must be loaded with the MSB first. After shifting in the 6 bit word, bringing LE high will set the attenuator to the desired state. While LE is high the CLK is masked to protect the data while implementing the change. SEROUT is the SERIN delayed by 6 clock cycles. When P/S is low, the serial control interface is disabled and the serial input register is loaded asynchronously with parallel digital inputs. For all modes of operations, the outputs will stay constant while LE is kept low. The parallel mode is enabled when P/S is set to low. In the direct parallel mode, the attenuator is controlled by the parallel control inputs directly. The LE must be at logic high to control the attenuator in this mode. In the latched parallel mode, the parallel control inputs will be buffered by registers, and loaded to the outputs when LE is high. The outputs shall not change states when LE is low. Power-up States The power-up (PUP) states will work in both serial and parallel modes, and initiate the attenuator according to the PUP truth table. During power up, the digital inputs shall be held constant for at least 1 μs after VCC reaches 90% of final value. For serial mode, the PUP states will only work when LE is held low. The PUP state shall be locked out after the first LE pulse. |
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