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For price, delivery and to place orders: Hittite Microwave Corporation, 2 Elizabeth Drive, 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
5
HMC542ALP4 / 542ALP4E
v06.0312
0.5 dB LSB GaAs MMIC 6-BIT DIGITAL
SERIAL CONTROL ATTENUATOR, DC - 4 GHz
Pin Number
Function
Description
Interface Schematic
1, 3, 5, 14,
16-18, 23
N/C
These pins are not connected internally. However, all data
shown herein was measured with these pins connected
to RF/DC Ground.
2
Vcc
Supply Voltage.
4, 15
RF1, RF2
This pin is DC coupled and matched to 50 Ohms
Blocking capacitors are required. Select value based on
lowest frequency of operation.
6 - 11, 13
ACg1 - ACg7
External capacitor to ground is required. Select value for
lowest frequency of operation. Place capacitor as close to
pins as possible.
12
N/C
This pin is not connected internally and any connection made
to it externally will have no effect on product performance.
19
Serial Output
Serial data output. Serial input data
delayed by 8 clock cycles
20
Reset
See truth table, control voltage table and timing diagram.
21
Shift Clock
22
Latch Enable
24
Serial Input
gnD
Package bottom has an exposed metal paddle
that must be connected to RF/DC Ground.
Pin Descriptions
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