HMC305LP4 Datasheet, PDF (3/8 Pages) Hittite Microwave Corporation – 0.5 dB LSB GaAs MMIC 5-BIT SERIAL CONTROL DIGITAL ATTENUATOR, 0.7 - 3.8 GHz

HMC305LP4 / 305LP4E
v02.0705
0.5 dB LSB GaAs MMIC 5-BIT SERIAL
CONTROL DIGITAL ATTENUATOR, 0.7 - 3.8 GHz
6
Worst Case Step Error
Between Successive Attenuation States
1.2
1
0.8
0.6
0.4
0.2
0
-0.2
-0.4
-0.6
-0.8
-1
-1.2
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
Vcc = +3V
0 to 0.7V
2.3 to 3.0V
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
Symbol
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)
ts
th
tlsup
tpd
-
fclk
Vcc = +5V
Min. Max.
20
-
0
-
40
-
-
30
20
-
-
30
Vcc = +3V Units
Min. Max.
100 -
ns
5
-
ns
100 -
ns
-
70 ns
50
-
ns
-
10 MHz
Truth Table
Serial Control Input
C 0.5 C 1
C2
C4
C8
Attenuation
Setting
RF1 - RF2
High High High High High
Reference
I.L.
Low High High High High
0.5 dB
High Low High High High
1 dB
High High Low High High
2 dB
High High High Low High
4 dB
High High High High Low
8 dB
Low Low
Low
Low
Low
15.5 dB
Max. Atten.
Any combination of the above states will provide an attenuation
approximately equal to the sum of the bits selected.
Timing Diagram
6 - 54
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