MAX4649 Datasheet, PDF (7/10 Pages) Maxim Integrated Products – 45Ω, SPDT Analog Switch in SOT23-8

45Ω, SPDT Analog Switch in SOT23-8
leakage characteristics. Device operation is un-
changed, and the difference between V+ and V- should
not exceed 44V. These protection diodes are not rec-
ommended when using a single supply.
Off-Isolation at High Frequencies
In 50Ω systems, the high-frequency on-response of
these parts extends from DC to above 300MHz, with a
typical loss of -3.6dB. When the switch is turned off,
however, it behaves like a capacitor, and off-isolation
decreases with increasing frequency. This effect is
more pronounced with higher source and load imped-
ances. Above 5MHz, circuit board layout becomes criti-
cal. The graphs shown in the Typical Operating
Characteristics were taken using a 50Ω source and
load connected with BNC connectors.
NO_
Vg
Figure 1. Overvoltage Protection
Test Circuits/Timing Diagrams
V+
D1
V+
COM
V-
D2
V-
+3V
LOGIC
INPUT ₀
V_NO
SWITCH ^VO
OUTPUT
V_NC
t_R < 20ns
50%
t_F < 20ns
t_TRANS
t_TRANS
0.9V_NO ^0.9VNC
Figure 2. MAX4649 Transition Time
V_NC
V_NO
LOGIC
INPUT
+V
NC ^V+
NO
IN
GND
MAX4649
COM
V-
-V
V_O
R_L
C_L
1000Ω
35pF
C_L INCLUDES FIXTURE AND STRAY CAPACITANCE.
_______________________________________________________________________________________ 7