±80

±60

±40

±20

0

1

10

100

1 K

10 K

100 K

Frequency (Hz)

C00

±80

±70

±60

±50

±40

±30

±20

±10

0

1

10

100

1 K

10 K

100 K

1,000 K

Frequency (Hz)

C00

REF3312, REF3318, REF3320, REF3325, REF3330, REF3333

www.ti.com

SBOS392E – AUGUST 2007 – REVISED OCTOBER 2014

10.2.1.3.2

AC Performance

The ac transfer function for the attenuation and level-shifting circuit is shown in Figure 23.

The low-frequency ac CMRR performance is measured to be 62 dB, as shown in Figure 24.

Figure 23. Measured AC Transfer Function

Figure 24. Measured AC CMRR Results

11 Power-Supply Recommendations

The REF33xx family of voltage references features extremely low dropout voltage, except for the REF3312. The

REF3312 has a minimum supply requirement of 1.8 V. These references can be operated with a supply 110 mV

above the output voltage with a 5-mA load (typical). For loaded conditions, a typical dropout voltage versus load

graph is illustrated in Figure 4 of the Typical Characteristics.

If the supply voltage connected to the IN pin is rapidly moved while the REF33xx is connected to a capacitive

load, a reverse voltage may discharge through the OUT pin and into the REF33xx. This voltage will not damage

the REF33xx, provided that it is less than or equal to 5 V.

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Product Folder Links: REF3312 REF3318 REF3320 REF3325 REF3330 REF3333