Applications Information

Circuit Layout and Bypassing

The high-gain bandwidth of the MAX49140 requires design precautions to realize the full high-speed capabilities of this

comparator. The recommended precautions are:

1) Use a PCB with a good, unbroken, low-inductance ground plane.

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 comparator.

5) Solder the device directly to the PCB instead of using a socket.

Typical Applications

Figure 4 and Figure 5 show two typical applications.

MAX512

MAX512

8-BIT DAC

VREFC

SDI

SERIAL

DIGITAL

INPUT

DACOUTC

GND

ANALOG IN

MAX49140

MAX49140

Figure 4. 3.3V Digitally Controlled Threshold Detector

20kΩ

COAX LINE

MAX49140

MAX49140

20kΩ

10kΩ

CLEAN

DIGITAL

SIGNAL

3V

0

Figure 5. Line Receiver Application

MAX49140

30ns, Low-Power, 3V/5V, Rail-to-Rail Single-

Supply Comparator

www.maximintegrated.com

19-100740

Maxim Integrated | 11