LM7332

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SNOSAV4B – APRIL 2008 – REVISED JANUARY 2016

Typical Application (continued)

8.2.2 Detailed Design Procedure

The LM7332 can be used as a drive amplifier for SAR ADCs as shown in Figure 50.

signals up to half of the supply voltage with low distortion.

To determine whether or not the LM7332 is a suitable driver for this application, one must compare the settling

time of the amplifier to the acquisition time of the ADC with Equation 1:

where

•

•

N: Number of bits in ADC

•

(1)

GBWP of 21 MHz so it is indeed a suitable driver for this application.

where

•

•

(2)

the nearest common capacitor value within the range.

where

•

•

•

•

table

(3)

to be 617.5

(4)

Figure 51 shows the THD+N response of the LM7332 with a single supply voltage of 5 V. The LM7332 can

met, and the LM7332 is a suitable drive amplifier for the 12-bit SAR ADC in this design example.

Driving two independent channels of the SAR ADC within minimal crosstalk between the channels may also be

required. Figure 52 shows the crosstalk rejection over frequency. The LM7332 achieves 105 dB of crosstalk

rejection up to 20 kHz and greater than 75 dB up to 1MHz which demonstrates the suitability of measuring very

large input signals without interfering with adjacent channels.

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