MAX9144EUD 데이터 시트보기 (PDF) - Maxim Integrated

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MAX9144EUD

40ns, Low-Power, 3V/5V, Rail-to-Rail Single-Supply Comparators

Maxim Integrated 

40ns, Low-Power, 3V/5V, Rail-to-Rail

Single-Supply Comparators

DIFFERENTIAL

INPUT

VOLTAGE

tS tH

VOD

VOS

VCC

LE

VCC

2

0

tPD

VOH

VCC

OUT

2

VOL

Figure 2. MAX9141 Timing Diagram with Latch Operator

Output Stage Circuitry

The MAX9140/MAX9141/MAX9142/MAX9144 contain a

current-driven output stage as shown in Figure 4.

During an output transition, ISOURCE or ISINK is pushed

or pulled to the output pin. The output source or sink

current is high during the transition, creating a rapid

slew rate. Once the output voltage reaches VOH or

VOL, the source or sink current decreases to a small

value, capable of maintaining the VOH or VOL static

condition. This significant decrease in current con-

serves power after an output transition has occurred.

One consequence of a current-driven output stage is a

linear dependence between the slew rate and the load

capacitance. A heavy capacitive load will slow down a

voltage output transition. This can be useful in noise-

sensitive applications where fast edges may cause

interference.

Applications Information

Circuit Layout and Bypassing

The high-gain bandwidth of the MAX9140/MAX9141/

MAX9142/MAX9144 requires design precautions to

realize the full high-speed capabilities of these com-

parators. The recommended precautions are:

1) Use a PCB with a good, unbroken, low-induc-

tance ground plane.

2) Place a decoupling capacitor (a 0.1µF ceramic

capacitor is a good choice) as close to VCC as

possible.

tLPW

tLPD

MAX9140

MAX9141

4.1kΩ

MAX9142

IN+

TO INTERNAL

MAX9144

CIRCUITRY

TO INTERNAL

IN–

CIRCUITRY

4.1kΩ

Figure 3. Input Stage Circuitry

3) Pay close attention to the decoupling capacitor’s

bandwidth, keeping leads short.

4) On the inputs and outputs, keep lead lengths

short to avoid unwanted parasitic feedback

around the comparators.

5) Solder the device directly to the PCB instead of

using a socket.

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