5
MAX19794
10MHz to 500MHz Dual Analog Voltage Variable
Attenuator with On-Chip 10-Bit SPI-Controlled DAC
5V AC ELECTRICAL CHARACTERISTICS
(Typical Application Circuit, one attenuator, V
CC
= 4.75V to 5.25V, RF ports are driven from 50I sources and loaded into 50I, input
P
RF
= 0dBm, f
RF
= 10MHz to 500MHz, V
CTRL
= 1V to 4V, V
DAC_LOGIC
= 0V, RDBK_EN (D9, REG3) = Logic 0, T
C
= -40NC to +100NC.
Typical values are for T
C
= +25NC, V
CC
= 5.0V, input P
RF
= 0dBm, f
RF
= 55MHz, V
CTRL
= 1.0V, V
DAC_LOGIC
= 0V, RDBK_EN (D9,
REG3) = Logic 0, unless otherwise noted.) (Notes 5, 7)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNIT
Insertion Loss
IL
One attenuator
1.5
dB
Two attenuators
3.0
5.0
dB
Loss Variation Over Temperature
T
C
= -40NC to +100NC
0.29
dB
Input P
1dB
IP
1dB
21.8
dBm
Minimum Input Second-Order
Intercept Point Over Full
Attenuation Range (Note 8)
IIP2
One attenuator
f
RF1
+ f
RF2
term,
f
RF1
- f
RF2
= 1MHz
V
CTRL
= 1.0V to 4.0V
P
RF
= 0dBm/tone applied to attenuator input
48.1
dBm
Two attenuators
f
RF1
+f
RF2
term,
f
RF1
- f
RF2
= 1MHz
V
CTRL
= 1.0V to 4.0V
P
RF
= 0dBm/tone applied to attenuator input
46.5
Minimum Input Third-Order
Intercept Point
Over Full Attenuation Range
(Note 8)
IIP3
One attenuator
V
CTRL
from 1.0V to 4.0V
f
RF1
- f
RF2
= 1MHz
P
RF
= 0dBm/tone applied to attenuator input
34.4
dBm
Two attenuators
V
CTRL
from 1.0V to 4.0V
f
RF1
- f
RF2
= 1MHz
P
RF
= 0dBm/tone applied to attenuator input
32.3
Second Harmonic
63
dBc
Third Harmonic
97
dBc
Attenuation Control Range
One attenuator, V
CTRL
= 1.0V to 4.0V,
f
RF
= 55MHz
22.4
dB
Two attenuators V
CTRL
= 1.0V to 4.0V,
f
RF
= 55MHz
38.5
44.7
dB
Average Attenuation-Control
Slope
V
CTRL
= 1.5V to 3.1V
8.0
dB/V
V
CTRL
= 1.5V to 3.5V
9.4
Maximum Attenuation-Control
Slope
V
CTRL
= 1.5V to 3.5V
30
dB/V
Attenuation Flatness over
any 125MHz band
V
CTRL
= 1.0V to 3.1V,
f
RF
= 10MHz to 250MHz
0.15
dB
V
CTRL
= 1.0V to 3.1V,
f
RF
= 250MHz to 500MHz
0.2
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