MAX4625 Maxim, MAX4625 Datasheet - Page 7

• Manufacturer Part Number: MAX4625
• Description: The MAX4624/MAX4625 are low-on-resistance, low-voltage single-pole/double-throw (SPDT) analog switches that operate from a single +1
• Manufacturer: Maxim

a small-signal diode (D1) as shown in Figure 1. If the
analog signal can dip below GND, add D2. Adding
protection diodes reduces the analog range to a diode
drop (about 0.7V) below V+ (for D1), and a diode drop
above ground (for D2). On-resistance increases slightly
at low supply voltages. Maximum supply voltage (V+)
must not exceed +6V.
Adding protection diode D2 causes the logic threshold
to be shifted relative to GND. TTL compatibility is not
guaranteed when D2 is added.
Figure 2. Switching Time
Figure 3a. Break-Before-Make Interval (MAX4624 only)
MAX4624
MAX4624
MAX4625
LOGIC
INPUT
LOGIC
INPUT
V
N_
V
IN_
_______________________________________________________________________________________
C
C
V
OUT
L
L
NC
NO
IN
INCLUDES FIXTURE AND STRAY CAPACITANCE.
INCLUDES FIXTURE AND STRAY CAPACITANCE.
NO
OR NC
IN
= V
GND
N_
(
R
GND
L
R
+ R
L
ON
V+
V+
)
V+
V+
COM
COM
1Ω, Low-Voltage, Single-Supply
R
50Ω
L
R
50Ω
L
V
OUT
C
35pF
C
35pF
L
L
V
OUT
Protection diodes D1 and D2 also protect against some
overvoltage situations. With Figure 1’s circuit, if the sup-
ply voltage is below the absolute maximum rating, and
if a fault voltage up to the absolute maximum rating is
applied to an analog signal pin, no damage will result.
SPDT Analog Switches
OUTPUT
SWITCH
LOGIC
INPUT
Test Circuits/Timing Diagrams
LOGIC
INPUT
V
OUT
V
V
INH
INL
0V
V
V
INH
INL
LOGIC INPUT WAVEFORMS INVERTED FOR SWITCHES
THAT HAVE THE OPPOSITE LOGIC SENSE.
V
50%
t
50%
OUT
ON
0.9 · V
t
D
0UT
t
OFF
0.9 · V
t r < 5ns
t f < 5ns
0.9 · V
OUT
OUT
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