SD210DE View Datasheet(PDF) - Linear Technology

Part Name

Description

Manufacturer

SD210DE

N-CHANNEL LATERAL DMOS SWITCH

Linear Technology 

VGATE

(a) TOP: 5 V/div

BOT: 50 mV/div

HOR: 0.5 µs/div

POINT (1)

(b) TOP: 5 V/div

BOT: 50 mV/div

∆V

HOR: 0.5 µs/div

POINT (2)

Figure 10. Waveforms for Points (1) and (2) of Figure 9

capacitances to the signal of an adjacent channel

can form ghosts and signal interference. To

help obtain high degrees of isolation, it becomes

necessary to exercise careful circuit layout,

reducing parasitic capacitive and inductive

couplings, and to use proper shielding and

bypassing techniques. Figure 11 shows the

excellent off-isolation and crosstalk

performance typical of this family of DMOS

analog switches.

Insertion Loss

At low frequencies, the attenuation caused by

the switch is a function of its on-resistance and

the load impedance. They form a simple series

voltage divider network. As an example, for a

600 Ω load impedance the insertion loss for

voice signals (1 Vrms at 3 kHz) is less than 0.3

dB. Thus, the SD5000 series make good audio

crosspoint switches.

1 Vrms

600 Ω

600 Ω

600 Ω 600 Ω

Crosstalk

1 Vrms

600 Ω

600 Ω

Off Isolation

160

140

Crosstalk

120

100

Off Isolation

80

60

40

1k

10 k 100 k 1 M 10 M 100 M

Frequency (Hz)

Figure 11. SD5000 Crosstalk and Off Isolation vs Frequency

6

Linear Integrated Systems, Inc. ● 4042 Clipper Ct. ● Fremont, CA 94538 ● Tel: 510 490-9160 ● Fax: 510 353-0261

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