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MAX4695EUB+T

P1-P3P4-P6P7-P9P10-P11
MAX4695
Low-Voltage, 60Ω Dual
SPDT Analog Switch in Thin QFN
_______________________________________________________________________________________ 7
Detailed Description
The MAX4695 is a low-voltage, dual single-pole/dou-
ble-throw (SPDT) analog switch that operates from a
single +1.8V to +5.5V supply. When powered from a
+2.7V supply, the device has a 60Ω (max) on-resis-
tance (R
ON
), with 3Ω (max) R
ON
matching and 10Ω
(max) R
ON
flatness. The digital logic inputs are 1.8V-
logic compatible from a +2.7V to +3.3V supply.
Applications Information
Digital Control Inputs
The MAX4695 logic inputs are 1.8V CMOS logic com-
patible for 3V operation and TTL compatible for 5V
operation of V+. Driving IN_ rail-to-rail minimizes power
consumption.
Analog Signal Levels
Analog signals that range over the entire supply volt-
age (V+ to GND) are passed with very little change in
on-resistance (see Typical Operating Characteristics).
The switches are bidirectional, so the NO_, NC_, and
COM_ pins can be either inputs or outputs.
Power-Supply Sequencing and
Overvoltage Protection
Caution: Do not exceed the absolute maximum rat-
ings because stresses beyond the listed ratings
may cause permanent damage to devices.
Proper power-supply sequencing is recommended for
all CMOS devices. Always apply V+ before applying
analog signals, especially if the analog signal is not
current limited. If this sequencing is not possible, and if
the analog inputs are not current limited to <20mA, add
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.
Protection diodes D1 and D2 also protect against some
overvoltage situations. In the circuit in Figure 1, if the
supply 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.
POSITIVE SUPPLY
COM
NO
D2
D1
GND
V
g
V+
MAX4695
Figure 1. Overvoltage Protection Using Two External Blocking
Diodes
Pin Description
PIN
µMAX TQFN
NAME FUNCTION
1 12 IN1 Digital Control Input Switch 1
2 1 NO1 Analog Switch 1—Normally Open Terminal
3 2 GND Ground
4 3 NO2 Analog Switch 2—Normally Open Terminal
5 4 IN2 Digital Control Input Switch 2
6 5 COM2 Analog Switch 2—Common Terminal
— 6, 10 N.C. No Connection. Not internally connected.
7 7 NC2 Analog Switch 2—Normally Closed Terminal
8 8 V+ Positive Supply Voltage Input
9 9 NC1 Analog Switch 1—Normally Closed Terminal
10 11 COM1 Analog Common Switch 1
MAX4695
Low-Voltage, 60Ω Dual
SPDT Analog Switch in Thin QFN
8 _______________________________________________________________________________________
Test Circuits/Timing Diagrams
50%
V
INH
V
INL
LOGIC
INPUT
V
OUT
0.9 × V
OUT
t
D
LOGIC
INPUT
R
L
300Ω
GND
C
L
INCLUDES FIXTURE AND STRAY CAPACITANCE.
NO_
IN_
NC_
V
OUT
V+
V+
C
L
35pF
V
N_
V
IN_
COM_
MAX4695
0.9 × V
0UT
Figure 3. Break-Before-Make Interval
V
GEN
GND
COM_
C
L
1nF
V
OUT
V+
V
OUT
IN
OFF
ON
OFF
∆V
OUT
Q = (∆V
OUT
)(C
L
)
NC_
OR NO_
IN DEPENDS ON SWITCH CONFIGURATION;
INPUT POLARITY DETERMINED BY SENSE OF SWITCH.
OFF
ON
OFF
IN
V
INL
TO V
INH
V+
R
GEN
IN
MAX4695
Figure 4. Charge Injection
t
r
< 5ns
t
f
< 5ns
50% 50%
V
INL
LOGIC
INPUT
R
L
300Ω
COM_
GND
IN_
C
L
INCLUDES FIXTURE AND STRAY CAPACITANCE.
V
OUT
= V
N_ (
R
L
)
R
L
+ R
ON
V
INH
t
OFF
0
NO_
OR NC_
0.9 × V
0UT
0.9 × V
OUT
t
ON
V
OUT
SWITCH
OUTPUT
LOGIC
INPUT
LOGIC INPUT WAVEFORMS INVERTED FOR SWITCHES
THAT HAVE THE OPPOSITE LOGIC SENSE.
V+
C
L
35pF
V+
V
OUT
MAX4695
V
N_
V
IN_
Figure 2. Switching Time
MAX4695
Low-Voltage, 60Ω Dual
SPDT Analog Switch in Thin QFN
_______________________________________________________________________________________ 9
Test Circuits/Timing Diagrams (continued)
MEASUREMENTS ARE STANDARDIZED AGAINST SHORTS AT IC TERMINALS.
OFF-ISOLATION IS MEASURED BETWEEN COM_ AND "OFF" NO_ OR NC_ TERMINAL ON EACH SWITCH.
ON-LOSS IS MEASURED BETWEEN COM_ AND "ON" NO_ OR NC_TERMINAL ON EACH SWITCH.
CROSSTALK IS MEASURED FROM ONE CHANNEL TO ALL OTHER CHANNELS.
SIGNAL DIRECTION THROUGH SWITCH IS REVERSED; WORST VALUES ARE RECORDED.
+5V
V
OUT
V+
IN_
NC_
COM_
NO_
V
IN
MAX4695
OFF-ISOLATION = 20log
V
OUT
V
IN
ON-LOSS = 20log
V
OUT
V
IN
CROSSTALK = 20log
V
OUT
V
IN
NETWORK
ANALYZER
50Ω
50Ω 50Ω
50Ω
MEAS REF
10nF
0 OR V+
50Ω
GND
Figure 5. Off-Isolation/On-Channel Bandwidth, Crosstalk
CAPACITANCE
METER
NC_ or
NO_
COM_
GND
IN_
V
INL
OR
V
INH
10nF
V+
f = 1MHz
V+
MAX4695
Figure 6. Channel Off/On-Capacitance
Chip Information
TRANSISTOR COUNT: 130
P1-P3P4-P6P7-P9P10-P11

MAX4695EUB+T

Mfr. #:
Buy MAX4695EUB+T
Manufacturer:
Maxim Integrated
Description:
Analog Switch ICs 60Ohm Dual SPDT Analog Switch
Lifecycle:
New from this manufacturer.
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