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Data Sheet

ADR3625/ADR3630/ADR3650

APPLICATIONS INFORMATION

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Rev. A | 22 of 26

BASIC VOLTAGE REFERENCE CONNECTION

The basic configuration for the ADR3625\ADR3630\ADR3650 refer-

ence is shown in Figure 68. For detailed information on connecting

the bypass capacitors, see the Input and Output Capacitors section.

Figure 68. Basic Reference Connection

INPUT AND OUTPUT CAPACITORS

Input Capacitors

A 1 μF to 10 μF electrolytic or ceramic capacitor can be connected

to the input to improve transient response in applications where

the supply voltage can fluctuate. It is recommended to connect an

additional 0.1 μF ceramic capacitor in parallel to reduce supply

noise.

Output Capacitors

A COUT is required for stability and to filter out low level voltage

noise. The minimum value of COUT is 0.1 μF and can go as high as

10 μF for stability.

An additional 1 μF to 10 μF electrolytic or ceramic capacitor can be

added in parallel to improve transient performance in response to

sudden changes in load current.

The larger the output capacitor, the lower the bandwidth of the

output is, thus lowering the noise. However, increasing the output

capacitor increases the settling time and decreases the response

rate.

The ADR3625\ADR3630\ADR3650 are stable with a variety of

capacitor types, including ceramic, electrolytic (including polymer),

tantalum, and film. Small surface-mount capacitors have low effec-

tive series resistance (ESR) and take up little board space. Place

and connect the output capacitor as close as possible to the VOUT

FORCE pin. Use low ESR capacitors.

START-UP TIME

The start-up time is determined by the output capacitance and

output load current. Figure 69 shows an example of the start-up

response of the ADR3625 when stepping the supply voltage and

Figure 70 shows an example of the start-up response of the

ADR3625 when stepping the enable voltage.

Figure 69. ADR3625 Start-Up Response (Input)

Figure 70. ADR3625 Start-Up Response (Enable)

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