_______________Detailed Description

The MAX4526/MAX4527 are phase-reversal analog

switches, consisting of two normally open and two nor-

mally closed CMOS analog switches arranged in a

bridge configuration. Analog signals are put into two

input pins and taken out of two output pins. A logic-

level signal controls whether the input signal is routed

through normally or inverted. A low-resistance DC path

goes from inputs to outputs at all times, yet isolation

between the two signal paths is excellent. Analog sig-

nals range from V- to V+.

These parts are characterized and optimized with ±15V

supplies, and they can operate from a single supply.

The MAX4526 is optimized for high-frequency opera-

tion, and has a higher-speed logic-level translator and

switch driver. The MAX4527 has identical analog switch

characteristics, but has a slower logic-level translator

and switch driver for lower current consumption.

The MAX4526/MAX4527 are designed for DC and low-

frequency-signal phase-reversal applications, such as

chopper amplifiers, modulator/demodulators, and self-

zeroing or self-calibrating circuits. Unlike conventional

CMOS switches externally wired in a bridge configura-

tion, both DC and AC symmetry are optimized with a

small 8-pin configuration that allows simple board lay-

out and isolation of logic signals from analog signals.

Phase-Reversal Analog Switches

6

_______________________________________________________________________________________

NAME

FUNCTION

PIN

1

A

Analog-Switch Input Terminal A.

Connected to Y when IN is low; con-

nected to X when IN is high.

2

B

Analog-Switch Input Terminal B.

Connected to X when IN is low; con-

nected to Y when IN is high.

4

IN

Logic-Level Control Inputs (see

Truth

Table).

3

GND

Ground. Connect GND to digital

ground. (Analog signals have no

ground reference; they are limited to

V+ and V-.)

5

V-

Negative Analog Supply-Voltage

Input. Connect V- to GND for single-

supply operation.

6

Y

Analog-Switch Output Terminal Y.

7

X

Analog-Switch Output Terminal X.

8

V+

Positive Analog/Digital Supply-Voltage

Input. Internally connected to sub-

strate.

__________________Pin Configuration

Note: A, B, X and Y pins are identical and interchangeable.

Either may be considered as an input or output; signals pass

equally well in either direction. However, AC symmetry is best

when A and B are the input, and X and Y are the output.

Reduce AC balance in critical applications by using A and X or

A and Y as the input, and B and Y or B and X as the output.

Y

IN

LOGIC LO

GND

X

B

A

MAX4526

MAX4527

MAX4526

MAX4527

TRUTH TABLE

IN

O

1

A

Y

X

B

X

Y

V-

INPUTS

V+

V+

V-

OUTPUTS

Y

IN

LOGIC HI

X

B

A

GND

V-

V-

INPUTS

V+

V+

OUTPUTS

Figure 1. Typical Application Circuits