Datasheet

_______________Detailed Description
The MAX4598 can be configured as a single 8-channel
or dual 4-channel multiplexer. In the single 8-to-1 multi-
plexer configuration, COMA connects to one of the
eight inputs (NO1 to NO8), GND, or V+ by the address
inputs A0 to A2 (see Truth Table ). In the dual 4-to-1
multiplexer configuration, COMA connects to one of the
four inputs (NO1, NO3, NO5, NO7), GND, or V+, and
COMB connects to one of the four inputs (NO2, NO4,
NO6, NO8) or GND by the address inputs A0 to A2
(see Truth Table ).
The MAX4598 functions as a standard multiplexer
when NLATCH is high. When NLATCH is low, the con-
dition set by A0 to A3 is activated at the rising edge of
LATCH. Otherwise, the outputs remain at the previously
set condition.
__________Applications Information
The MAX4598 construction is typical of most CMOS
analog switches. It has three supply pins: V+, V-, and
GND. The positive and negative power supplies are
used to drive the internal CMOS switches and set the
limits of the analog voltage on any switch. Reverse
ESD-protection diodes are internally connected be-
tween each analog signal pin and V+ and V-. If the volt-
age on any pin exceeds V+ or V- by 0.3V, one of the
ESD diodes starts to conduct. During normal operation
these reverse-biased ESD diodes leak, forming the only
current drawn from V-.
MAX4598
Low-Voltage, Combination Single-Ended
8-to-1/Differential 4-to-1 Multiplexer
_______________________________________________________________________________________ 7
-2
2
1
0
-1
4
3
5
6
-5 -1-2-4 -3 0 1 2 3 4 5
CHARGE INJECTION vs. V
COM
MAX4598-10
V
COM
(V)
Q (pC)
V+ = +5V
V- = -5V
V+ = +5V
V- = 0
Typical Operating Characteristics (continued)
(T
A
= +25°C, unless otherwise noted.)
Pin Description
Positive Supply VoltageV+9
Multiplexer Output ACOMA10
Data-Strobe Mode SelectNLATCH11
Latch InputLATCH12
Multiplexer EnableEN13
Channel Input 2NO25
Channel Input 3NO36
Channel Input 1NO17
Negative Supply VoltageV-8
Channel Input 4NO44
Address Bit 0A03
PIN
Address Bit 1A12
Multiplexer Output BCOMB1
FUNCTIONNAME
Channel Input 6NO616
Channel Input 8NO817
Address Bit 3A318
Address Bit 2A219
GroundGND20
Channel Input 5NO514
Channel Input 7NO715
0
-90
0.1 10 1001 1000
FREQUENCY RESPONSE
-70
-80
MAX4598-09
FREQUENCY (MHz)
LOSS (dB)
-50
-60
-40
-30
-10
-20
180
-180
-100
-140
PHASE (°C)
-20
-60
20
60
140
100
OFF-ISOLATION
INSERTION LOSS
ON-PHASE