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250MHz to 4000MHz Dual,
Analog Voltage Variable Attenuator
3
AC ELECTRICAL CHARACTERISTICS
(MAX19790 Evaluation Kit, line and connector losses included, two attenuators in cascade, V
CC
 = 4.75V to 5.25V, RF ports are
driven from 50I sources, input P
RF
 = -10dBm, f
RF
 = 950MHz to 2150MHz, V
CTRL
 = +1.0V, T
C
 = -40癈 to +85癈. Typical values are
for T
C
 = +25癈, V
CC
 = +5.0V, input P
RF
 = -10dBm, f
RF
 = 1500MHz, V
CTRL
 = +1.0V, unless otherwise noted.)
Note 5: Operating outside this range for extended periods may affect device reliability. Limit pin input current to 40mA when V
CC
 
is not present (see Table 1 for R4 value).
Note 6: Operation outside this range is possible, but with degraded performance of some parameters. See the Typical Operating
Characteristics.
Note 7: f
1
 = 1500MHz, f
2
 = 1501MHz, -10dBm/tone at attenuator input.
Note 8: Guaranteed by design and characterization.
Note 9: Switching time is measured from 50% of the control signal to when the RF output settles to Q1dB.
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAx
uNITS
Insertion Loss
IL
T
C
 = +25NC
950MHz to 1500MHz
4.4
6.3
dB
950MHz to 2150MHz
4.4
7.0
Loss Variation Over Temperature
T
C
 = -40NC to +85NC
0.6
dB
Input P
1dB
IP
1dB
23.1
dBm
Input Second-Order Intercept
Point
IIP2
f
RF1
 + f
RF2
 term, f
RF1
 - f
RF2
 = 1MHz
(Note 7)
69.6
dBm
Input Third-Order Intercept Point
IIP3
f
RF1
 - f
RF2
 = 1MHz (Note 7)
36.3
dBm
Second Harmonic
2f
IN
72
dBc
Third Harmonic
3f
IN
77
dBc
Attenuation-Control Range
A
R
One attenuator, V
CTRL
 = +1.0V
to +4.0V, T
C
 = +25NC
22
dB
Two attenuators,
V
CTRL
 = +1.0V
to +4.0V,
T
C
 = +25NC
950MHz to 1500MHz
36
44.7
950MHz to 2150MHz
33
44.7
Average Attenuation-Control
Slope
V
CTRL
 = +1.0V to +3.5V
20.0
dB/V
Maximum Attenuation-Control
Slope
V
CTRL
 = +1.0V to +3.5V
30.4
dB/V
Attenuation Flatness Over
125MHz Bandwidth (Note 8)
Peak-to-peak for V
CTRL
 = +1.0V to +3.1V,
T
C
 = +25NC
0.13
0.89
dB
Switching Time
From 15dB to 0dB attenuation (Note 9)
500
ns
Input Return Loss
All gain settings
25
dB
Output Return Loss
All gain settings
21
dB
Group Delay
Input/output 50I lines deembedded
190
ps
Group-Delay Flatness Over
125MHz Bandwidth
Peak-to-peak
10
ps
Group-Delay Change vs.
Attenuation Control
V
CTRL
 = +1.0V to +4.0V
-175
ps
Insertion Phase Change vs.
Attenuation Control
V
CTRL
 = +1.0V to +4.0V
82
Degrees
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