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MAX19794
10MHz to 500MHz Dual Analog Voltage Variable
Attenuator with On-Chip 10-Bit SPI-Controlled DAC
5V AC ELECTRICAL CHARACTERISTICS (continued)
(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)
Note 5: Production tested at T
C
= +100癈. All other temperatures are guaranteed by design and characterization.
Note 6: Recommended functional range. Not production tested. Operation outside this range is possible, but with degraded per-
formance of some parameters.
Note 7: All limits include external component losses, connectors and PCB traces. Output measurements taken at the RF port of the
typical application circuit.
Note 8: f
RF1
 = 56MHz, f
RF2
 = 55MHz, P
RF
 = 0dBm/tone applied to attenuator input.
Note 9: Switching time is measured from 50% of the CTRL signal to when the RF output settles to ?dB. R3 = 0I
Note 10: Switching time is measured from when CS is asserted to when the RF output settles to ?dB.
Note 11: Switching time is measured from when MODE is asserted to when the RF output settles to ?dB.
Note 12: Typical minimum time for proper SPI operation.
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNIT
CTRL Switching Time
(Note 9)
15dB to 0dB range
390
ns
0dB to 15dB range
780
CS Switching Time
(Note 10)
15dB to 0dB range
700
ns
0dB to 15dB range
2600
MODE Switching Time (Note 11)
15dB to 0dB range (MODE 1 to 0)
700
ns
0dB to 15dB range (MODE 0 to 1)
2600
Input Return Loss
31
dB
Output Return Loss
28
dB
Group Delay
40
ps
Group Delay Flatness
f
RF
= 30MHz to 88MHz
25
ps
Group Delay Change
V
CTRL
 = 1.0V to 4.0V
-400
ps
Insertion Phase Change vs.
Attenuation Control
V
CTRL
 = 1.0V to 4.0V
5
deg
S21 Attenuation Deviation from a
Straight Line
V
CTRL
 = 1.5V to 3.1V
?.35
dB
SERIAL PERIPHERAL INTERFACE (SPI)
Maximum Clock Speed
20
MHz
Data-to-Clock Setup Time
t
CS
(Note 12)
2
ns
Data-to-Clock Hold Time
t
CH
(Note 12)
2.5
ns
CS to CLK Setup Time
t
EWS
(Note 12)
3
ns
CS Positive Pulse Width
t
EW
(Note 12)
7
ns
Clock Pulse Width
t
CW
(Note 12)
5
ns
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