MAX40016 datasheet(21/22 Pages) MAXIM

21 / 22 page

The next step is to choose the value of RF. Two charac-

teristics of the ADC should be considered when calculat-

ing RF: the acquisition time of converter (TACQ) and the

ADC sampling capacitance (CIN). In addition, the RC

network will require several time constants to settle once

the sampling switch is closed. If the ADC’s resolution is

12 bits, and the input needs to settle to less than 0.5LSB,

then 9 time constants will be required. Because settling

must occur during the acquisition period, RF * CF * 9 must

be less than or equal to TACQ if the error introduced by

the external RC network is to be less than 0.5LSB. This

results in a value of 139Ω or less for RF.

Finally, to ensure stability, the cutoff frequency of the

RF-CF low-pass filter should be smaller than the gain-

bandwidth product of the amplifier. Choosing 130Ω

and 1.2nF yields about 1MHz which is smaller than the

1.5MHz gain-bandwidth product of the amplifier. Note

that Voltage at ISH, ISM, ISL pins should not exceed

1.1V for proper operation (see Input Voltage Range Under

Amplifier section of the Electrical Characteristics table).

PART

TEMP RANGE

PIN-

PACKAGE

TOP

MARK

MAX40016ANL+T -40°C to +125°C

15 WLP

+AAB

MAX40016ATE+T -40°C to +125°C

16 TQFN

—

+Denotes a lead(Pb)-free/RoHS-compliant package.

T = Denotes tape-and-reel.

Ordering Information

www.maximintegrated.com

Maxim Integrated │ 21

MAX40016

4-Decade Current Sense Amplifier

with Integrated Current Sense Element

MAX40016 Datasheet(PDF) 21 Page - Maxim Integrated Products