AN207 Vishay Intertechnology, AN207 Datasheet

AN207

Manufacturer Part Number

AN207

Description

15-ns DG611 Switch Family Combines Benefits of CMOS And Dmos

Manufacturer

Vishay Intertechnology

Datasheet

1.AN207.pdf (12 pages)

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The DG611, DG612, and DG613 are extremely low-power,

high-speed analog switches designed to optimize circuit

performance in high-speed switching applications. Each of

these devices integrates low-power CMOS drivers with

high-speed DMOS FETs. The resulting switches boast some

remarkable

on-resistance, low leakage, low charge injection and low

channel capacitance, all on the same device.

By combining both CMOS and DMOS technologies on a single

chip, the DG61X family avoids the tradeoffs inherent in other

high-speed

consumption,

capacitance. The DG61X family is likewise superior to DMOS

FETs, which are fast but highly sensitive to electrostatic

discharge, as well as requiring external drivers built with a

number of external discrete components.

This application note describes the new DG61X devices in

detail and provides a series of application hints which will help

you take full advantage of this fast new family in your designs.

Document Number: 70605

03-Aug-99

All Switches Shown for Logic “0” Inputs.

1-4

analog

features:

Normally Closed

12-ns DG611 Switch Family Combines Benefits of

high

DG611

on-resistance,

switches,

high

speed,

CMOS and DMOS Technologies

1-4

such

and

FIGURE 1. Functional Diagrams (Typical Switch)

low

high

power,

1-4

channel

power

low

Normally Open

DG612

Circuit Description

Each device has four independently controlled switches. The

DG611 and DG612 respond to opposite control logic. The

DG611 has a normally closed (NC) function while the DG612

is a normally open (NO) device.

The DG613 offers a complementary function. It contains two

NO and two NC switches. This versatile device can be

configured as two single-pole single-throw (SPDT), one

double-pole double-throw (DPDT), a “T” switch, two “L”

switches, and so forth.

As illustrated in Figure 2, each analog switch channel consists

of an input stage, followed by a level translator, a driver stage,

and an n-channel MOSFET.

The input stage is a CMOS inverter powered from V

logic power supply voltage (normally +5 V). As with any classic

CMOS inverter, control input pin impedance is very high and

essentially equivalent to the logic input pin capacitance

(approximately 5 pF). This pin does not draw current (except

for leakage) when in a steady state. To change states it is

necessary to charge or discharge this input capacitance,

which requires a short current pulse from the control logic gate.

1-4

1, 4

2, 3

www.vishay.com FaxBack 408-970-5600

Vishay Siliconix

Complementary

DG613

AN207

. V

1, 4

2, 3

is the

6-1

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