DIO2140

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DIO2140• Rev. 1.5

Analog signal input

For a differential input, input signals to P and N pins via DC-cut capacitors (CI). And, with an input impedance of

150 kΩ (typ.), a lower cut-off frequency of an input signal becomes 32.1 Hz at CI = 33 nF.

For a signal-ended input, input a signal to P via a DC-cut capacitor (CI). At this time, N pin should be connected to

AVSS via a DC-cut capacitor (CI) with the same capacitance. Gain and a lower Cut-off frequency are the same as

in the above case.In addition, the output impedance (ZOUT) of the former source circuit, including signal paths up

to P terminal and N terminal should be designed to become 600 Ω or lower.

Recommended Protection Diode

It is necessary to connect the backward diode with the output terminal to prevent IC destruction by the output

self-excitation phenomenon when using it on the conditions of 4.5 V < VDD ≤ 5.25 V.

Component Selection

Figure 2 shows a DIO2140 with differential inputs and input capacitors, and Figure 3 shows a DIO2140 with

single-ended inputs. Differential inputs should be used whenever possible because single-ended inputs are

much more susceptible to noise.

REF DES

Value

EIA Size

RI

150 kΩ (±5%)

0402

CI

33 nF (±10%)

0201