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MAX9030/MAX9031/MAX9032/MAX9034

Detailed Description

The MAX9030/MAX9031/MAX9032/MAX9034 are sin-

gle/dual/quad low-cost comparators. They have an

operating supply voltage from +2.5V to +5.5V when

operating from a single supply and from ±1.25V to

±2.75V when operating from dual power supplies, and

consume only 35µA. Their common-mode input voltage

range extends from the negative supply to within 1.1V

of the positive supply. Internal hysteresis ensures clean

output switching, even with slow-moving input signals.

Shutdown Mode

The MAX9030 comparator comes with a power-saving

shutdown mode. When in shutdown, the supply current

drops from a typical 35µA to 0.05µA, and the outputs

become high impedance. SHDN has a high input imped-

ance and typically draws 0.1µA when connected to V

or V

. A maximum logic low voltage of 0.3V

applied to SHDN places the device in the shutdown

mode. A minimum logic high voltage of 0.7V

applied to SHDN will enable normal operation. To dis-

able shutdown, connect SHDN to V

Applications Information

Adding Hysteresis

Hysteresis extends the comparator’s noise margin by

increasing the upper threshold and decreasing the

lower threshold. A voltage-divider from the output of the

comparator sets the trip voltage. Therefore, the trip volt-

age is related to the output voltage.

These comparators have 4mV internal hysteresis.

Additional hysteresis can be generated with two resis-

tors using positive feedback (Figure 1). Use the follow-

ing procedure to calculate resistor values:

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

Single-Supply Comparators

6 _______________________________________________________________________________________

Pin Description

M A X9 0 3 0 M A X9 0 3 1 M A X9 0 3 2 M A X9 0 3 4

NAME FUNCTION

11—— IN+ Comparator Noninverting Input

224 11V

N eg ati ve S up p l y V ol tag e. Byp ass w i th a 0.1µF cap aci tor .

33—— IN- Comparator Inverting Input

44——OUT Comparator Output

5 —— —SHDN Shutdown

658 4 V

P osi ti ve S up p l y V ol tag e. Byp ass w i th a 0.1µF cap aci tor .

—— 1 1 OUTA Comparator A Output

—— 2 2 INA- Comparator A Inverting Input

—— 3 3 INA+ Comparator A Noninverting Input

—— 5 5 INB+ Comparator B Noninverting Input

—— 6 6 INB- Comparator B Inverting Input

—— 7 7 OUTB Comparator B Output

——— 8 OUTC Comparator C Output

——— 9 INC- Comparator C Inverting Input

——— 10 INC+ Comparator C Noninverting Input

——— 12 IND+ Comparator D Noninverting Input

——— 13 IND- Comparator D Inverting Input

——— 14 OUTD Comparator D Output