Variable Reluctance Sensor Interfaces with

Differential Input and Adaptive Peak Threshold

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7

Pin Description

PIN

MAX9924

MAX9925

MAX9926

MAX9927

NAME

FUNCTION

1

1

—

—

IN+

Noninverting Input

2

2

—

—

IN-

Inverting Input

—

3

—

—

OUT

Amplifier Output

3

—

—

—

N.C.

No Connection. Not internally connected.

4

4

—

—

BIAS

Input Bias. Connect to an external resistor-divider and bypass

to ground with a 0.1µF and 10µF capacitor.

5

5

11

11

GND

Ground

6

6

13

—

ZERO_EN

Zero-Crossing Enable. Mode configuration pin, internally

Ω resistor.

7

7

—

—

COUT

Comparator Output. Open-drain output, connect a 10k

Ω pullup

8

8

—

—

EXT

External Reference Input. Leave EXT unconnected in Modes

A1, A2. Apply an external voltage in Modes B, C.

9

9

—

—

INT_THRS

Internal Adaptive Threshold. Mode configuration pin.

10

10

14

14

Power Supply

—

—

1

1

INT_THRS1

Internal Adaptive Threshold 1. Mode configuration pin.

—

—

2

2

EXT1

External Reference Input 1. Leave EXT unconnected in Modes

A1, A2. Apply an external voltage in Modes B, C.

—

—

3

3

BIAS1

Input Bias 1. Connect to an external resistor-divider and

bypass to ground with a 0.1µF and 10µF capacitor.

—

—

4

4

COUT1

Comparator Output 1. Open-drain output, connect a 10k

Ω

—

—

5

5

COUT2

Comparator Output 2. Open-drain output, connect a 10k

Ω

—

—

6

6

BIAS2

Input Bias 2. Connect to an external resistor-divider and

bypass to ground with a 0.1µF and 10µF capacitor.

—

—

7

7

EXT2

External Reference Input 2. Leave EXT unconnected in Modes

A1, A2. Apply an external voltage in Modes B, C.

—

—

8

8

INT_THRS2

Internal Adaptive Threshold 2. Mode configuration pin.

—

—

9

9

IN2+

Noninverting Input 2

—

—

10

10

IN2-

Inverting Input 2

—

—

12

—

DIRN

Rotational Direction Output. Open-drain output, connect a

—

—

—

12

OUT2

Amplifier Output 2

—

—

—

13

OUT1

Amplifier Output 1

—

—

15

15

IN1-

Noninverting Input 1

—

—

16

16

IN1+

Inverting Input 1