LT6236 datasheet(22/50 Pages) LINER

22 / 50 page

LTC2372-16

237216f

For more information www.linear.com/LTC2372-16

Figure 8a. LT6237 Buffering a Fully Differential or Pseudo-Differential Signal Source

applicaTions inForMaTion

Driving the MUX Analog Inputs

The LTC2372-16 can be programmed to accept fully

differential or pseudo-differential input signals. In most

applications, it is recommended that the LTC2372-16 be

driven using the LT6237 ADC driver configured as two

unity-gain buffers regardless of the input range, as shown

in Figure 8a. The LT6237 combines fast settling and good

DC linearity with a 1.1nV/√Hz input-referred noise den-

sity, enabling it to achieve the full ADC data sheet SNR

and THD specifications for all input ranges, as shown in

the FFT plots in Figures 8b, 8c and 8d. The RC filter time

constant is chosen to allow for sufficient transient settling

of the LTC2372-16 MUX analog inputs during acquisition.

With a maximum supply current of 7.8mA, the LT6237

is a perfect complement to the low power LTC2372-16.

Figure 8b. 32k Point FFT fSMPL =

500ksps, fIN = 1kHz for Circuit Shown in

Figure 8a; Driven with Fully Differential

Inputs

Figure 8c. 32k Point FFT fSMPL =

500ksps, fIN = 1kHz for Circuit Shown

in Figure 8a; Driven with Unipolar

Inputs

Figure 8d. 32k Point FFT fSMPL =

500ksps, fIN = 1kHz for Circuit Shown

in Figure 8a; Driven with Bipolar

Inputs

SNR = 96.1dB

THD = –113dB

SINAD = 96dB

SFDR = 113.5dB

FREQUENCY (kHz)

100

150

200

250

–180

–160

–140

–120

–100

–80

–60

–40

–20

237216 F08b

SNR = 93.2dB

THD = –109.5dB

SINAD = 93.1dB

SFDR = 111.5dB

FREQUENCY (kHz)

100

150

200

250

–180

–160

–140

–120

–100

–80

–60

–40

–20

237216 F08c

SNR = 93.1dB

THD = –109.4dB

SINAD = 93dB

SFDR = 110.8dB

FREQUENCY (kHz)

100

150

200

250

–180

–160

–140

–120

–100

–80

–60

–40

–20

237216 F08d

CH0

CH1

CH2

CH3

CH4

CH5

CH6

CH7

COM

MUX CHANNELS

CH0 AND CH1

SELECTED

MUXOUT+/–

SHORTED TO

ADCIN+/–

LTC2372-16

16-BIT ADC CORE

–

237216 F08a

1200pF

LT6237

4.096V

–

1200pF

–

4.096V

2.048V

V+

V–

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