ISL54062_0911 Datasheet, PDF (11/16 Pages) Intersil Corporation – Negative Signal Swing, Sub-ohm, Dual SPDT

ISL54062
High-Frequency Performance
In 50Ω systems, the ISL54062 has an ON switch -3dB
bandwidth of 60MHz (see Figure 21). 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 22 details the high
Off-Isolation and Crosstalk rejection provided by this part. At
100kHz, Off-Isolation is about 60dB in 50Ω systems,
decreasing approximately 20dB per decade as frequency
increases. At 1MHz, Crosstalk is about -75dB in 50Ω
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.
Typical Performance Curves T_A = +25°C, Unless Otherwise Specified
2.0
1.8 ^ICOM ^{= 100mA}
V+ = 1.8V
1.6
1.4
1.2
1.0
0.8
V+ = 2.7V
0.6
V+ = 4.5V
0.4
0.2
-6 -5 -4 -3 -2 -1 0 1 2
3 45
V_COM (V)
FIGURE 11. ON-RESISTANCE vs SUPPLY VOLTAGE vs
SWITCH VOLTAGE
1.00
0.95
V+ = 4.5V
0.90
I_COM = 100mA
0.85
0.80
0.75
0.70
T = +85°C
0.65
0.60
T = +25°C
0.55
0.50
T = -40°C
0.45
0.40
0.35
0.30
-3
-2
-1
0
1
2
3
4
5
V_COM (V)
FIGURE 12. ON-RESISTANCE vs SWITCH VOLTAGE
1.00
0.95
0.90
0.85
V+ = 4.3V
I_COM = 100mA
0.80
0.75
0.70
T = +85°C
0.65
0.60
0.55
T = +25°C
0.50
0.45
T = -40°C
0.40
0.35
0.30
-3
-2
-1
0
1
2
3
4
5
V_COM (V)
FIGURE 13. ON-RESISTANCE vs SWITCH VOLTAGE
1.25
V+ = 2.7V
1.15
I_COM = 100mA
1.05
0.95
0.85
0.75
0.65
T = +85°C
0.55
T = +25°C
0.45
T = -40°C
0.35
-5 -4 -3 -2 -1 0
1
2
34
V_COM (V)
FIGURE 14. ON-RESISTANCE vs SWITCH VOLTAGE
11
FN6581.1
November 3, 2009