ADA4945-1ACPZ-R2 datasheet(54/57 Pages) AD

номер детали	ADA4945-1ACPZ-R2

подробное описание детали	High Speed, ±0.1 μV/˚C Offset Drift, Fully Differential ADC Driver

PDF	57 Pages

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производитель	AD [Analog Devices]

домашняя страница	http://www.analog.com

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54 / 57 page

Data Sheet

ADA4945-1

analog.com

Rev. A

54 of 57

source of the AD7768 to 2.5 V. With an output common-mode voltage of 2.5 V, each ADA4945-1 output swings

between 0.5 V and 4.5 V, opposite in phase, providing a gain of 1 and a 8 V p-p differential signal to the ADC input. The

differential RC section between the ADA4945-1 output and the ADC input provides a single-pole, low-pass filter to

help reduce current spikes due to ADC input switching.

Table 14 shows the SNR and total distortion (THD) of the ADA4945-1 driving the AD7768 and AD4003 for various input

frequencies at a near full-scale signal. The RC filter values in Figure 116 are also shown, as well as the reference

voltage (REF) level.

Figure 116. ADA4945-1 Driving Precision ADC

Table 14.SNR and THD for ADA4945-1 Driving AD7768 and AD4003

ADC

Frequency

(kHz)

Signal Level

(V p-p)

REF (V)

R (Ω) C (pF)

CDIFF (pF)

SNR (dB)

THD (dB)

AD7768 1

8.0

4.096

270

680

106.7

−115.9

8.0

4.096

270

680

106.5

−115.5

8.0

4.096

270

680

105.8

−116.9

7.98

4.096

270

680

104.7

−116.2

AD4003 1

9.5

5.0

200

180

Not

applicable

98.5

−123.5

9.5

5.0

200

180

Not

applicable

98.3

−117.0

100

9.1

5.0

200

180

Not

applicable

96.3

−100.3

ADA4945-1

+7V

–2V

1kΩ

+2.5V

ADC

–IN

+IN

VREF

+VCLAMP

–VCLAMP

CDIFF

REF

+DIN

–DIN

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