HMC542LP4 Datasheet, PDF (3/8 Pages) Hittite Microwave Corporation – 0.5 dB LSB GaAs MMIC 6-BIT DIGITAL SERIAL CONTROL ATTENUATOR, DC - 3.0 GHz

HMC542LP4 / 542LP4E
v00.0306
0.5 dB LSB GaAs MMIC 6-BIT DIGITAL
SERIAL CONTROL ATTENUATOR, DC - 3.0 GHz
Worst Case Step Error
Between Successive Attenuation States
6
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)
CMOS Control Voltages
State
Low
High
Vcc = +5V
0 to 1.3V
3.5 to 5.0V
Serial Input Truth Table
Latch
Enable
X
X
Shift
Clock
X
Ç
Ç
X
Reset
L
H
H
Function
Shift register cleared
Shift register clocked
Contents of shift register
transferrred to Digital
Attenuator
Timing
Parameter
Serial Input Setup Time
Hold time from Serial
Input to Shift Clock
Setup time from Shift
Clock to Latch Enable
Propagation delay, Latch
Enable to C0.5 through
C8
Setup time from Reset to
Shift Clock
Clock Frequency
(1/tclk)
Symbol
ts
th
tlsup
tpd
-
fclk
Vcc = +5V
Min. Max.
20
-
0
-
40
-
-
30
20
-
-
30
Units
ns
ns
ns
ns
ns
MHz
Truth Table
Control Voltage Input
Attenua-
tion State
C16 C8
C4
C2
C1 C0.5 _{RF1 - RF2}
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.
Timing Diagram
6 - 184
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