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PE4304 Datasheet(PDF) 7 Page - Peregrine Semiconductor |
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PE4304 Datasheet(HTML) 7 Page - Peregrine Semiconductor |
7 / 11 page Product Specification PE4304 Page 7 of 11 Document No. 70-0066-04 │ www.psemi.com ©2003-2006 Peregrine Semiconductor Corp. All rights reserved. Programming Options Parallel/Serial Selection Either a parallel or serial interface can be used to control the PE4304. The P/S bit provides this selection, with P/S=LOW selecting the parallel interface and P/S=HIGH selecting the serial interface. Parallel Mode Interface The parallel interface consists of five CMOS- compatible control lines that select the desired attenuation state, as shown in Table 5. The parallel interface timing requirements are defined by Figure 19 (Parallel Interface Timing Diagram), Table 9 (Parallel Interface AC Characteristics), and switching speed (Table 1). For latched parallel programming the Latch Enable (LE) should be held LOW while changing attenuation state control values, then pulse LE HIGH to LOW (per Figure 19) to latch new attenuation state into device. For direct parallel programming, the Latch Enable (LE) line should be pulled HIGH. Changing attenuation state control values will change device state to new attenuation. Direct Mode is ideal for manual control of the device (using hardwire, switches, or jumpers). Table 5. Truth Table Note: Not all 64 possible combinations of C0.5-C16 are shown in table Serial Interface The serial interface is a 6-bit serial-in, parallel-out shift register buffered by a transparent latch. It is controlled by three CMOS-compatible signals: Data, Clock, and Latch Enable (LE). The Data and Clock inputs allow data to be serially entered into the shift register, a process that is independent of the state of the LE input. The LE input controls the latch. When LE is HIGH, the latch is transparent and the contents of the serial shift register control the attenuator. When LE is brought LOW, data in the shift register is latched. The shift register should be loaded while LE is held LOW to prevent the attenuator value from changing as data is entered. The LE input should then be toggled HIGH and brought LOW again, latching the new data. The timing for this operation is defined by Figure 18 (Serial Interface Timing Diagram) and Table 8 (AC Characteristics). Power-up Control Settings The PE4304 always assumes a specifiable attenuation setting on power-up. This feature exists for both the Serial and Parallel modes of operation, and allows a known attenuation state to be established before an initial serial or parallel control word is provided. When the attenuator powers up in Serial mode (P/ S=1), the six control bits are set to whatever data is present 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. When the attenuator powers 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 Table 6 (Power-Up Truth Table, Parallel Mode). Table 6. Parallel PUP Truth Table Note: Power up with LE=1 provides normal parallel operation with C0.5-C16, and PUP1 and PUP2 are not active. P/S C16 C8 C4 C2 C1 C0.5 Attenuation State 0 0 0 0 0 0 0 Reference Loss 0 0 0 0 0 0 1 0.5 dB 0 0 0 0 0 1 0 1 dB 0 0 0 0 1 0 0 2 dB 0 0 0 1 0 0 0 4 dB 0 0 1 0 0 0 0 8 dB 0 1 0 0 0 0 0 16 dB 0 1 1 1 1 1 1 31.5 dB P/S LE PUP2 PUP1 Attenuation State 0 0 0 0 Reference Loss 0 0 1 0 8 dB 0 0 0 1 16 dB 0 0 1 1 31 dB 0 1 X X Defined by C0.5-C16 |
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