DG612AK 데이터 시트보기 (PDF) - Vishay Semiconductors

부품명

상세내역

일치하는 목록

DG612AK

High-Speed, Low-Glitch D/CMOS Analog Switches

Vishay Semiconductors 

DG611, DG612, DG613

Vishay Siliconix

TEST CIRCUITS

+5V

+ 15 V

Rg

VL

S

V+

D

Vg

IN

5V

GND

V-

VO

CL

1 nF

-3V

Figure 3. Charge Injection

+5V

C

+ 15 V

C

VL

V+

VS

S1

D1

Rg = 50 

IN1

1 V, 4 V

S2

D2

NC

1 V, 4 V

IN2

GND

V-

C

XTA LK Isolation = 20 log

C = RF bypass

VS

VO

-3V

Figure 4. Crosstalk

50 

VO

RL

APPLICATIONS

High-Speed Sample-and-Hold

In a fast sample-and-hold application, the analog switch

characteristics are critical. A fast switch reduces aperture

uncertainty. A low charge injection eliminates offset (step)

errors. A low leakage reduces droop errors. The CLC111, a

fast input buffer, helps to shorten acquisition and settling

times. A low leakage, low dielectric absorption hold capacitor

must be used. Polycarbonate, polystyrene and

polypropylene are good choices. The JFET output buffer

reduces droop due to its low input bias current.

(see figure 5.)

Pixel-Rate Switch

Windows, picture-in-picture, title overlays are economically

generated using a high-speed analog switch such as the

DG613. For this application the two video sources must be

sync locked. The glitch-less analog switch eliminates halos.

(see figure 6.)

GaAs FET Drivers

Figure 7 illustrates a high-speed GaAs FET driver. To turn

the GaAs FET on 0 V are applied to its gate via S1, whereas

to turn it off, - 8 V are applied via S2. This high-speed,

low-power driver is especially suited for applications that

require a large number of RF switches, such as phased array

radars.

Analog

Input

Input Buffer

75 

CLC111

5 V Control

+ 5 V + 12 V

S

D

IN

1/4 DG611

Output Buffer

+

LF356

-

CHOLD

650 pF Polystyrene

-5V

Figure 5. High-Speed Sample-and-Hold

± 5 V Output

to A/D

www.vishay.com

8

Document Number: 70057

S11-0154-Rev. I, 31-Jan-11

Share Link: