CWB308CY Просмотр технического описания (PDF) - Calogic, LLC

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CWB308CY

CMOS/DMOS Quad Monolithic SPST Wide Band Analog Switches

Calogic, LLC 

CORPORATION

CWB308 / CWB309

APPLICATIONS

LOW DISTORTION, RAIL-TO-RAIL ANALOG SWITCH

Features very low distortion for low frequency and large

signal applications.

C1

R3

R4

R5

+V

C2

R1

V+

ANALOG IN

ANALOG OUT

R6

R2

V-

-V

VERY LOW DISTORTION CIRCUIT FOR LOW

FREQUENCY AND LARGE SIGNAL APPLICATIONS

This circuit provides very low distortion ( <0.1%) and

high off isolation ( >90 dB) at signal levels equal to the

supply voltage. The signal passes through a T switch

configuration and at the same time is modulating the

power supply. This modulation maintains a constant on

resistance rDS(on) which in turn reduces the distortion.

R5 is for bypassing the power supply and has a typical

value of 1K ohm, R4 should be a value that can be

accommadated by the signal source as load, R3 is only

necessary at loads lower than 100 ohms and should be

selected during the initial design of the circuit, C1 has

to be large enough for the lowest signal to pass and C2

will have to bypass all signals. R1 and R2 set up the

one logic level for the control input and should be set to

5 volts.

LOGIC INVERTER

V+

R1

ANALOG IN

5V

R2

ANALOG OUT

This circuit provides logic inversion with two resistors

and one switch. It does not require additional logic

parts. The resistors divide the supply voltage down to

a 5 volt level when high and are switched to a low level

via the switch. This configuration allows a single pole,

single throw switch to be changed into a single pole,

double throw switch.

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