AN207 View Datasheet(PDF) - Vishay Semiconductors
Part Name
Description
Manufacturer
AN207 Datasheet PDF : 12 Pages
| |||
AN207
Vishay Siliconix
Ref
RFB
DAC
IOUT
T/H
1/2 DG613
VOUT
VOUT
T/H
Deglitched
VOUT
FIGURE 18. DAC Deglitcher
DG612
R
V1
V2
RF
V3
V4
VOUT
VOUT
+
–
RF
R
(V1
) ...
)
V4)
a) On-State
"1 pA
ID(on)
rDS(on)
S
D
18 W
CS(on)
10 pF
b) Off-State
"1 pA
IS(off)
S
CS(off)
3 pF
"1 pA
CSD(off)
0.5 pF
ID(off)
D
CD(off)
2 pF
FIGURE 19. Low Distortion Audio Mixer Eliminates
Switching Noise
FIGURE 20. Static Switch Models
Audio Mixer
Switching audio inputs at the summing junction of an op amp
eliminates audio distortion due to on-resistance modulation.
This is because when turned on, the analog switch channel
stays at a constant 0 V. Unfortunately, any charge injection
Document Number: 70605
03-Aug-99
present during switching at the high impedance Op Amp input
gets amplified and can cause large output spikes. These
switching spikes usually cause clicking and/or popping noises.
Thanks to its low charge injection properties, the DG61X family
virtually eliminates this type of switching noise. A small
snubber network connected across the op amp inputs further
reduces any high-speed glitches.
www.vishay.com S FaxBack 408-970-5600
6-11
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