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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
3
HMC542ALP4 / 542ALP4E
v06.0312
0.5 dB LSB GaAs MMIC 6-BIT DIGITAL
SERIAL CONTROL ATTENUATOR, DC - 4 GHz
Worst Case Step Error
Between Successive Attenuation States
-1
-0.8
-0.6
-0.4
-0.2
0
0.2
0.4
0.6
0.8
1
0
0.5
1
1.5
2
2.5
3
3.5
4
FREQUENCY (GHz)
Timing Diagram
Truth Table
Control Voltage Input
Attenuation
State
RF1 - RF2
C16
C8
C4
C2
C1
C0.5
High
High
High
High    High
High
Reference
i.l.
High
High
High
High    High
Low
0.5 dB
High
High
High
High
Low
High
1 dB
High
High
High
Low
High
High
2 dB
High
High
Low
High    High
High
4 dB
High
Low
High
High    High
High
8 dB
Low
High
High
High    High
High
16 dB
Low
Low
Low
Low
Low
Low
31.5 dB
Any combination of the above states will provide an attenuation
approximately equal to the sum of the bits selected.
Digital Control Voltages
State
Vcc = +5V
Low
0 to 1.3V
High
3 to 5V
Parameter
Symbol
Vcc = +5V
Units
Min.
Max.
Serial Input Setup Time
ts
20
-
ns
Hold time from Serial
Input to Shift Clock
th
0
-
ns
Setup time from Shift
Clock to Latch Enable
tlsup
40
-
ns
Latch Enable Window,
Latch Enable to C0.5
through C8
tpd
-
30
ns
Setup time from Reset to
Shift Clock
-
20
-
ns
Clock Frequency
(1/tclk)
fclk
-
30
MHz
Timing
Serial Input Truth Table
Latch
Enable
Shift
Clock
Reset
Function
X
X
l
Shift register cleared
X
?/DIV>
H
Shift register clocked
?/DIV>
X
H
Contents of shift register
transferred to Digital
Attenuator
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