DG401/DG403/DG405
Improved, Dual, High-Speed Analog Switches
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__________Applications Information
_____________________Pin Description
Figure 1. Overvoltage Protection Using External Blocking Diodes
Operation with Supply Voltages
Other than ±15V
The DG401/DG403/DG405 switches operate with
±4.5V to ±20V bipolar supplies or with a +10V to +30V
single supply. In either case, analog signals ranging
from V+ to V- can be switched. The Typical Operating
Characteristics graphs illustrate typical analog-signal
and supply-voltage on-resistance variations. The usual
on-resistance temperature coefficient is 0.5%/°C (typ).
Logic Inputs
These devices operate with a single positive supply or
with bipolar supplies. They maintain TTL compatibility
with supplies anywhere in the ±4.5V to ±20V range as
long as V
L
= +5V. If V
L
is connected to V+ or another
supply at voltages other than +5V, the devices will
operate at CMOS-logic-level inputs.
Overvoltage Protection
Proper power-supply sequencing is recommended for
all CMOS devices. Do not exceed the absolute
maximum ratings because stresses beyond the listed
ratings may cause permanent damage to the devices.
Always sequence V+ on first, followed by V
L
, V-, and
logic inputs. If power-supply sequencing is not
possible, add two small, external signal diodes in
series with supply pins for overvoltage protection
(Figure 1). Adding diodes reduces the analog-signal
range to 1V below V+ and 1V below V-, without affect-
ing low switch resistance and low leakage
characteristics. Device operation is unchanged, and
the difference between V+ and V- should not exceed
+44V.
DG401
DIP/SO LCC
NAME FUNCTION
1, 8 2, 10 D1, D2 Drain (Analog Signal)
2-7
1, 3-9,
11, 16
N.C. Not internally connected
9, 16 12, 20 S2, S1 Source (Analog Signal)
10, 15 13, 19 IN2, IN1 Digital Logic Inputs
11 14 V+
Positive Supply-Voltage
Input—connected to
substrate
12 15 V
L
Logic Supply-Voltage Input
13 17 GND Ground
14 18 V-
Negative Supply-Voltage
Input
DG403
DIP/SO LCC
NAME FUNCTION
1, 8, 3, 6 2, 10, 4, 8 D1-D4 Drain (Analog Signal)
2, 7
1, 3, 6, 9,
11, 16
N.C. Not internally connected
11 14 V+
Positive Supply-Voltage
Input—connected to
substrate
12 15 V
L
Logic Supply-Voltage Input
13 17 GND Ground
14 18 V-
Negative Supply-Voltage
Input
DG405
DIP/SO LCC
NAME FUNCTION
1, 8, 3, 6 2, 10, 4, 8 D1-D4 Drain (Analog Signal)
2, 7
1, 3, 6, 9,
11, 16
N.C. Not internally connected
11 14 V+
Positive Supply-Voltage
Input—connected to
substrate
12 15 V
L
Logic Supply-Voltage Input
13 17 GND Ground
14 18 V- Negative Supply Voltage
