Datasheet

±80
±60
±40
±20
0
1 10 100 1 K 10 K 100 K
Vout (dB)
Frequency (Hz)
C00
±80
±70
±60
±50
±40
±30
±20
±10
0
1 10 100 1 K 10 K 100 K 1,000 K
CMRR (dB)
Frequency (Hz)
C00
REF3312 , REF3318 , REF3320 , REF3325 , REF3330 , REF3333
www.ti.com SBOS392D –AUGUST 2007–REVISED JUNE 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