MAX314CSE データシートの表示（PDF） - Maxim Integrated

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MAX314CSE

10 / Quad / SPST / CMOS Analog Switches

Maxim Integrated 

10Ω, Quad, SPST, CMOS Analog Switches

__________Applications Information

Low-Distortion Audio

The MAX312/MAX313/MAX314, having very low RON

and very low RON variation with signal amplitude, are

well suited for low-distortion audio applications. The

Typical Operating Characteristics show Total Harmonic

Distortion (THD) vs. Frequency graphs for several sig-

nal amplitudes and impedances. Higher source and

load impedances improve THD, but reduce off isolation.

Off Isolation at High Frequencies

In 50Ω systems, the high-frequency on-response of

these parts extends from DC to above 100MHz with a

typical loss of -2dB. When the switch is turned off, how-

ever, it behaves like a capacitor, and off isolation

decreases with increasing frequency. (Above 300MHz,

the switch actually passes more signal turned off than

turned on.) This effect is more pronounced with higher

source and load impedances.

Above 5MHz, circuit board layout becomes critical, and

it becomes difficult to characterize the response of the

switch independent of the circuit. The graphs shown in

the Typical Operating Characteristics were taken using

a 50Ω source and load connected with BNC connec-

tors to a circuit board deemed “average”; that is,

designed with isolation in mind, but not using strip-line

or other special RF circuit techniques. For critical appli-

cations above 5MHz, use the MAX440, MAX441, and

MAX442, which are fully characterized up to 160MHz.

V+

NO_

Vg

V+

COM_

V-

V-

Figure 1. Overvoltage Protection Using External Blocking

Diodes

+3V

LOGIC

INPUT 0V

50%

tr < 20ns

tf < 20ns

SWITCH 0V

OUTPUT

VO 0.9V0

tON

tOFF

0.9V0

LOGIC INPUT WAVEFORMS INVERTED FOR SWITCHES

THAT HAVE THE OPPOSITE LOGIC SENSE.

+5V

+15V

MAX312

MAX313

MAX314

SWITCH

INPUT

VCOM1

VL

COM1

IN1

V+

NO1

OR NC1

SWITCH

OUTPUT

VO

RL

300Ω

CL

35pF

LOGIC

INPUT

GND

V-

0V

-15V

REPEAT TEST FOR EACH SWITCH. FOR LOAD

CONDITIONS, SEE Electrical Characteristics.

CL INCLUDES FIXTURE AND STRAY CAPACITANCE.

( ) VO = VCOM

RL

RL + RON

Figure 2. Switching-Time Test Circuit

_______________________________________________________________________________________ 7

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