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HMC743LP6CE Datasheet(PDF) 10 Page - Hittite Microwave Corporation |
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HMC743LP6CE Datasheet(HTML) 10 Page - Hittite Microwave Corporation |
10 / 14 page 12 - 10 For price, delivery and to place orders: Hittite Microwave Corporation, 20 Alpha Road, Chelmsford, MA 01824 Phone: 978-250-3343 Fax: 978-250-3373 Order On-line at www.hittite.com Application Support: Phone: 978-250-3343 or apps@hittite.com 12 Serial Control Interface The HMC743LP6C(E) contains a 3-wire SPI compatible digital interface (SERIN, CLK, LEA (or LEB)) that is used to control the input and output gain control elements (digital attenuators). The input (IN) and output (OUT) attenuators can be individually controlled thru the latch enable pins. The LEA pin latches the serial 6-bit control word to the output attenuator. The LEB pin latches the serial 6-bit control word to the input attenuator. The 6-bit serial word can be loaded either MSB first or LSB first depending on the state of the BO (bit order) pin. Setting BO to high configures the serial controller to operate in LSB first mode. Setting BO to low configures the serial controller to operate in MSB first mode. When LEA or LEB (or both) is raised to a logic high, 6-bit data in the serial input register is transferred to the input attenuator or the output attenuator (or both). While either LEA or LEB are high, CLK signal must be masked or stopped to prevent data transition during output loading. Parameter Typ. Min. serial period, t SCK 100 ns Control set-up time, t Cs 20 ns Control hold-time, t CH 20 ns LE setup-time, t ln 10 ns Min. LE pulse width, t LEW 10 ns Min LE pulse spacing, t les 630 ns Serial clock hold-time from LE, t CKN 10 ns HMC743LP6C / 743LP6CE v04.0311 0.5 dB LSB GaAs MMIC DUAL 6-BIT DIGITAL VARIABLE GAIN AMPLIFIER, DC - 4 GHz PUP Truth Table le (A and B) pUp1 pUp2 Gain Relative to Max Setting 0 0 0 -63 db 0 1 1 0 db Power-Up States The HMC743LP6C offers two different power up states, either full attenuation or maximum gain mode. See truth table. Power-On Sequence The ideal power-up sequence is: GND, Vdd, digital inputs, RF inputs. The relative order of the digital inputs are not important as long as they are powered after Vdd / GND Timing Diagram Timing diagram is used for either input or output digital gain control. Control word is shown with MSB first (BO = Low) configuration. |
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