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4304-02 Datasheet(PDF) 3 Page - Peregrine Semiconductor Corp. |
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4304-02 Datasheet(HTML) 3 Page - Peregrine Semiconductor Corp. |
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3 / 11 page  Product Specification PE4304 Page 3 of 11 Document No. 70-0066-04 │ www.psemi.com ©2003-2006 Peregrine Semiconductor Corp. All rights reserved. Evaluation Kit The Digital Attenuator Evaluation Kit board was designed to ease customer evaluation of the PE4304 Digital Step Attenuator. J9 is used in conjunction with the supplied DC cable to supply VDD, GND, and –VDD. If use of the internal negative voltage generator is desired, then do not connect –VDD (Black banana plug). If an external – VDD is desired, then apply -3V. J1 should be connected to the parallel port of a PC with the supplied ribbon cable. The evaluation software is written to operate the DSA in serial mode, so Switch 7 (P/S) should be ON with all other switches off. Using the software, enable or disable each attenuation setting to the desired combined attenuation. The software automatically programs the DSA each time an attenuation state is enabled or disabled. To evaluate the Power up options, first disconnect the parallel ribbon cable from the evaluation board. The parallel cable must be removed to prevent the PC parallel port from biasing the control pins to unknown states. During power up in serial mode (P/ S=1 and LE=0) or in parallel mode with P/S=0 and LE=1, the default power-up signal attenuation is set to the value present on the six control bits on the six parallel data inputs (C0.5 to C16). This allows any one of the 64 attenuation settings to be specified as the power-up state. To power up in Parallel mode (P/S=0) with LE=0, the control bits are automatically set to one of four possible values. These four values are selected by the two power-up control bits, PUP1 and PUP2, as shown in the Parallel PUP Truth Table (Table 6). Figure 4. Evaluation Board Layout Figure 5. Evaluation Board Schematic Note: Resistors on pins 1 and 3 are required to avoid package resonance and meet error specifications over frequency. Peregrine Specification 101/0112 Peregrine Specification 102/0142 |
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