AN501 데이터 시트보기 (PDF) - Vishay Semiconductors
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AN501 Datasheet PDF : 11 Pages
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AN501
Vishay Siliconix
DG535/536 DC Characteristics
On-Resistance
On-resistance must be low to ensure low insertion loss, especially
when the switch drives low load resistances. As shown in
Figure 4, the on-resistance remains low and fairly constant over
the usable analog signal range. This makes the DG535/536
useful for audio applications that require low harmonic distortion.
400
360
320
280
240
200
160
120
80
40
0
0
rDS(on) vs. VD and Temperature
V+ = +15 V
GND = 0 V
125_C
25_C
–55_C
2
4
6
8
10
VD (V)
FIGURE 4. On-Resistance vs. Analog Signal Characteristics
Nominal rDS(on) = 50 W
RIN
600 W
DrDS(on) v 2 W
VIN
1 Vp-p
RL
600 W
VOUT
Insertion
Loss
+
20
LOG10
VOUT
VIN
FIGURE 5. 600-W Audio System
In a 600-W audio system, such as the one represented in
Figure 5, the percentage of on-resistance change relative to the
load resistance is only 0.33%. The insertion loss due to the switch
on-resistance is 0.7dB.
Leakage Current
The DG535/536 features low off and on leakage currents,
reducing switching errors.
Document Number: 70608
03-Aug-99
Power Supply Current Consumption
Until now, most available video multiplexers or digital crosspoint
switches relied on high-level supply currents for operation. The
DG535/536 requires a total supply current of only 5 mA, typical.
This feature makes the DG535/536 ideal for systems with high
channel density, such as 32-channel crosspoint matrices used in
video mixing consoles or as ECL digital crosspoint replacements
in large data transmission systems.
The total supply current for a 32-channel crosspoint system using
the DG535/536 is approximately 320 mA, much lower than other
video multiplexers.
DG536 AC Characteristics
(Refer to the DG535 data sheet for the 28-pin DIP performance.)
Bandwidth
The “on” frequency response is expressed as the frequency
at which the insertion loss (at dc) increases by 3 dB. The
measured bandwidth of the DG536 is greater than 300 MHz.
Crosstalk
Crosstalk is the amount of unwanted signal apparent at a
particular node due to the parasitic capacitance of the device. As
the most important parameter for many applications, crosstalk is
specified in a number of ways.
1. Single-channel crosstalk is the ratio of the signal seen at
the drain (output) to the signal applied to a single off-channel
input. This is expressed by
XTALK(SC)(dB)
+
20
log10
VOUT
VIN
Most conventional multiplexers specify this parameter on the
data sheet as off-isolation. This value for the DG536 is more
than twice as good as other 16-channel analog multiplexer
ICs, proving the effectiveness of the T switch.
2. All hostile crosstalk is the ratio of the signal measured at
the drain to the signal applied simultaneously to all
15 channels (i.e., with one channel on).
3. Chip-disabled crosstalk is the drain output to signal input
ratio. The input signal is applied to all 16 off channels simulta-
neously.
4. Adjacent input crosstalk is the ratio of the signal applied
to a source (input) to the signal measured at any adjacent
source. A low adjacent input crosstalk is required for video
applications to avoid ghosting effects that may appear on
video monitors or TV screens.
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