MAX9034AUD datasheet(7/9 Pages) MAXIM

Part #	MAX9034AUD

Description	Low-Cost, Ultra-Small, Single/Dual/Quad Single-Supply Comparators

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Manufacturer	MAXIM [Maxim Integrated Products]

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MAX9030/MAX9031/MAX9032/MAX9034

Low-Cost, Ultra-Small, Single/Dual/Quad

Single-Supply Comparators

7

Maxim Integrated

1) Find the trip points of the comparator using these

formulas:

VTH = VREF + [((VDD - VREF)R2) / (R1 + R2)

VTL = VREF(1 - (R2 / (R1 + R2))]

where VTH is the threshold voltage at which the com-

parator switches its output from high to low as VIN

rises above the trip point. VTL is the threshold volt-

age at which the comparator switches its output from

low to high as VIN drops below the trip point.

2) The hysteresis band will be:

VHYS = VTH - VTL = VDD(R2 / (R1 + R2))

3) In this example, let VDD = +5V and VREF = +2.5V.

VTH = 2.5V + 2.5(R2 / (R1 + R2))V

and

VTL = 2.5[1 - (R2 / (R1 + R2))]

4) Select R2. In this example, we will choose 1k

Ω.

5) Select VHYS. In this example, we will choose 50mV.

6) Solve for R1.

VHYS = VDD(R2 / (R1 + R2))

0.050V = 5(1000

Ω/(R1 + 1000Ω))V

where R1

≈ 100kΩ, VTH = 2.525V, and VTL = 2.475V.

The above-described design procedure assumes rail-

to-rail output swing. If the output is significantly loaded,

the results should be corrected.

Board Layout and Bypassing

Use 100nF bypass as a starting point. Minimize signal

trace lengths to reduce stray capacitance. Minimize the

capacitive coupling between IN- and OUT. For slow-

moving input signals (rise-time > 1ms), use a 1nF

capacitor between IN+ and IN-.

Biasing for Data Recovery

Digital data is often embedded into a bandwidth and

amplitude-limited analog path. Recovering the data can

be difficult. Figure 2 compares the input signal to a

time-averaged version of itself. This self-biases the

threshold to the average input voltage for optimal noise

margin. Even severe phase distortion is eliminated from

the digital output signal. Be sure to choose R1 and C1

so that:

ƒCAR >> 1 / (2

πR1C1)

where ƒCAR is the fundamental carrier frequency of the

digital data stream.

MAX9031

OUT

IN+

IN-

R2

R1

VIN

VREF

VDD

VSS

VDD

Figure 1. Additional Hysteresis

MAX9031

OUT

IN+

IN-

10k

Ω

0.1

µF

VDD

VIN

VSS

VDD

Figure 2. Time Averaging of the Input Signal for Data Recovery

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