ltc5590 Linear Technology Corporation, ltc5590 Datasheet - Page 18

• Manufacturer Part Number: ltc5590
• Description: Dual 600mhz To 1.7ghz High Dynamic Range Downconverting Mixer
• Manufacturer: Linear Technology Corporation

LTC5590
APPLICATIONS INFORMATION
should occur, the supply current could be sourced through
the ESD diode, potentially damaging the IC.
The Enable pins must be pulled high or low. If left float-
ing, the on/off state of the IC will be indeterminate. If a
three-state condition can exist at the enable pins, then a
pull-up or pull-down resistor must be used.
Supply Voltage Ramping
Fast ramping of the supply voltage can cause a current
glitch in the internal ESD protection circuits. Depending on
the supply inductance, this could result in a supply volt-
Table 7. IF Output Spur Levels (dBc), High Side LO
(RF = 900MHz, P
*Less than –100dBc
Table 8. IF Output Spur Levels (dBc), Low Side LO
(RF = 1400MHz, P
*Less than –100dBc
18
M
M
10
10
0
1
2
3
4
5
6
7
8
9
0
1
2
3
4
5
6
7
8
9
RF
RF
= –3dBm, P
= –3dBm, P
–31.8
–68.6
–40.8
–77.5
0
*
*
*
*
*
*
*
*
0
*
*
*
*
*
-
-
LO
LO
= 0dBm, V
= 0dBm, V
–40.0
–63.0
–46.2
–74.4
–88.7
1
0
*
*
*
*
*
*
*
*
1
0
*
*
*
*
*
CC
CC
= V
–49.0
–78.6
–42.2
–44.5
–69.3
= V
–42
CCIF
2
*
*
*
*
*
*
*
*
2
*
*
*
*
*
*
CCIF
= 3.3V, T
= 3.3V, T
–54.8
–47.4
–73.9
–81.5
–78.0
–55.9
–52.2
–71.7
–76.8
–93.7
3
*
*
*
*
*
*
3
*
*
*
*
*
C
C
= 25°C)
= 25°C)
–55.7
–72.2
–87.7
–56.9
–75.0
–89.2
4
*
*
*
*
*
*
*
*
4
*
*
*
*
*
*
*
*
N
N
age transient that exceeds the maximum rating. A supply
voltage ramp time of greater than 1ms is recommended.
Spurious Output Levels
Mixer spurious output levels versus harmonics of the RF
and LO are tabulated in Tables 7 and 8 for frequencies up
to 10GHz. The spur levels were measured on a standard
evalution board using the test circuit shown in Figure 1.
The spur frequencies can be calculated using the follow-
ing equation:
f
SPUR
–66.5
–64.0
–87.8
–71.3
–67.5
–86.4
–95.6
–94.5
5
*
*
*
*
*
*
*
*
5
*
*
*
*
*
*
= (M • f
–81.4
–88.5
–82.3
–67.4
–78.3
–83.2
6
*
*
*
*
*
*
*
*
6
*
*
*
*
*
*
*
*
RF
) – (N • f
–73.1
–70.3
–85.3
–73.4
7
*
*
*
*
*
*
*
*
*
7
*
*
*
*
*
*
*
*
*
LO
)
–74.3
–81.6
–69.9
–93.2
8
*
*
*
*
*
*
*
*
*
8
*
*
*
*
*
*
*
*
*
–72.5
–81.2
9
*
*
*
*
*
*
*
*
*
9
*
*
*
*
*
*
*
*
*
*
10
10
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
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