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PE4307 Datasheet(PDF) 7 Page - Peregrine Semiconductor Corp.

Part # PE4307
Description  75 廓 RF Digital Attenuator 5-bit, 15.5 dB, DC - 2.0 GHz
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Manufacturer  PEREGRINE [Peregrine Semiconductor Corp.]
Direct Link  http://www.peregrine-semi.com
Logo PEREGRINE - Peregrine Semiconductor Corp.

PE4307 Datasheet(HTML) 7 Page - Peregrine Semiconductor Corp.

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Product Specification
PE4307
Document No. 70-0161-05 │ www.psemi.com
Page 7 of 11
©2003-2013 Peregrine Semiconductor Corp. All rights reserved.
Programming Options
Parallel/Serial Selection
Either a parallel or serial interface can be used to
control the PE4307. The P/S bit provides this
selection, with P/S = LOW selecting the parallel
interface and P/S = HIGH selecting the serial
interface.
Parallel / Direct 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
Serial Interface
The PE4307’s serial interface is a 6-bit serial-in,
parallel-out shift register buffered by a transparent
latch. The latch 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 start bit (B5) of the data should
always be low to prevent an unknown state in the
device. The timing for this operation is defined by
Figure 18 (Serial Interface Timing Diagram) and
Table 8 (Serial Interface AC Characteristics).
Power-up Control Settings
The PE4307 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 five control bits are set to whatever
data is present on the five parallel data inputs (C0.5
to C8). This allows any one of the 32 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 two possible values.
These two values are selected by the power-up
control bit, PUP2, as shown in Table 6 (Power-Up
Truth Table, Parallel Mode).
Table 6. Power-Up Truth Table, Parallel
Interface Mode
Note: Power up with LE=1 provides normal parallel operation with C0.5-C8,
and PUP2 is not active
P/S
C8
C4
C2
C1
C0.5
Attenuation
State
0
0
0
0
0
0
Reference Loss
0
0
0
0
0
1
0.5 dB
0
0
0
0
1
0
1 dB
0
0
0
1
0
0
2 dB
0
0
1
0
0
0
4 dB
0
1
0
0
0
0
8 dB
0
1
1
1
1
1
15.5 dB
Note: Not all 32 possible combinations of C0.5-C8 are shown in table
P/S
LE
PUP2
Attenuation State
0
0
0
Reference Loss
0
0
1
8 dB
0
1
X
Defined by C0.5-C8


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