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ISL54059IRUZ-T Fiches technique(PDF) 9 Page - Intersil Corporation

No de pièce ISL54059IRUZ-T
Description  Negative Signal Swing, Sub-ohm, Dual SPDT Single Supply Switch
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Fabricant  INTERSIL [Intersil Corporation]
Site Internet  http://www.intersil.com/cda/home
Logo INTERSIL - Intersil Corporation

ISL54059IRUZ-T Fiches technique(HTML) 9 Page - Intersil Corporation

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9
FN6579.2
March 11, 2011
the input current below the threshold that produces
permanent damage.
This method is not acceptable for the signal path inputs.
Adding a series resistor to the switch input defeats the
purpose of using a low rON switch. Connecting external
Schottky diodes to the signal pins will shunt the fault current
to the V+ supply instead of through the internal ESD diodes
therefore protecting the switch. These Schottky diodes must
be sized to handle the expected fault current.
Power-Supply Considerations
The ISL54059 construction is typical of most single supply
CMOS analog switches, in that they have two supply pins:
V+ and GND. V+ and GND drive the internal CMOS
switches and set their analog voltage limits. Unlike switches
with a 5.5V maximum supply voltage, the ISL54059’s 6.5V
maximum supply voltage provides plenty of head room for
the 10% tolerance of 5V supplies due to overshoot and noise
spikes.
The minimum recommended supply voltage is 1.8V. It is
important to note that the input signal range, switching times,
and ON-resistance degrade at lower supply voltages. Refer
to the “Electrical Specifications” tables, beginning on page 3,
and “Typical Performance Curves”, beginning on page 10,
for details.
V+ and GND also power the internal logic and level shifters.
The level shifters convert the input logic levels to V+ and
GND signals levels to drive the analog switch gate terminals.
A high frequency decoupling capacitor placed as close to the
V+ and GND pin as possible is recommended for proper
operation of the switch. A value of 0.1µF is highly
recommended.
Negative Signal Swing Capability
The ISL54059 contains circuitry that allows the analog
switch signal to swing below ground. The device has an
analog signal range of 6.5V below V+ up to the V+ rail (see
Figure 14) while maintaining low rON performance. For
example, if V+ = 5V, then the analog input signal range is
from -1.5V to +5V. If V+ = 2.7V then the range is from -3.8V
to +2.7V.
Logic-Level Thresholds
This switch family is 1.8V CMOS compatible (0.45V VOLMAX
and 1.35V VOHMIN) over a supply range of 1.8V to 3.3V
(see Figure 16). At 3.3V the VIL level is 0.5V maximum. This
is still below the 1.8V CMOS guaranteed low output
maximum level of 0.45V, but noise margin is reduced. At
3.3V the VIH level is 1.4V minimum. While this is above the
1.8V CMOS guaranteed high output minimum of 1.35V,
under most operating conditions the switch will recognize
this as a valid logic high.
The digital input stages draw supply current whenever the
digital input voltage is not at one of the supply rails. Driving
the digital input signals from GND to V+ with a fast transition
time minimizes power dissipation. The ISL54059 has been
designed to minimize the supply current whenever the digital
input voltage is not driven to the supply rails (0V to V+). For
example, driving the device with 2.85V logic high while
operating with a 4.2V supply the device draws only 1µA of
current.
High-Frequency Performance
In 50
Ω systems, the ISL54065 has an ON switch -3dB
bandwidth of 60MHz (see Figure 19). The frequency
response is very consistent over a wide V+ range, and for
varying analog signal levels.
An OFF switch acts like a capacitor across the open
terminals and AC couples higher frequencies, resulting in
signal feed-through from a switch’s input to its output. Off
Isolation is the resistance to this feed-through. Crosstalk
indicates the amount of feed-through from one switch
channel to another switch channel. Figure 20 details the high
Off-Isolation and Crosstalk rejection provided by this part. At
100kHz, Off-Isolation is about 60dB in 50
Ω systems,
decreasing approximately 20dB per decade as frequency
increases. At 1MHz, Crosstalk is about -75dB in 50
Ω
systems, decreasing approximately 20dB per decade as
frequency increases.
Leakage Considerations
Reverse ESD protection diodes are internally connected
between each analog-signal pin, V+ and GND. One of these
diodes conducts if any analog signal exceeds the
recommended analog signal range.
Virtually all the analog switch leakage current comes from the
ESD diodes and reversed biased junctions in the switch cell.
Although the ESD diodes on a given signal pin are identical and
therefore fairly well balanced, they are reverse biased
differently. Each is biased to either the +Ring or -Ring and the
analog input signal. This means their leakages will vary as the
signal varies. The difference in the two diode leakages to the
+Ring or -Ring and the reverse biased junctions at the internal
switch cell constitutes the analog-signal-path leakage
current.
GND
VCOMx
VNCx
V+
LOGIC
INPUTS
VNOx
-RING
+RING
CLAMP
1k
Ω
FIGURE 8. OVERVOLTAGE PROTECTION
ISL54059


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