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AD7984 датащи(PDF) 10 Page - Analog Devices

номер детали AD7984
подробное описание детали  Devices Connected
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производитель  AD [Analog Devices]
домашняя страница  http://www.analog.com
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AD7984 датащи(HTML) 10 Page - Analog Devices

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CN-0269
Circuit Note
Rev. 0 | Page 10 of 12
Figure 19. Errors vs. Switching Rate Without Front Buffer at 16-Channel
Single-Ended, 14 V Step
Figure 20. Errors vs. Switching Rate Without Input Buffer, 8-Channel
Differential Mode, 14 V Step
Figure 21. Errors vs. Switching Rate with Input Buffer, 16-Channel
Single-Ended Mode, 14 V Step
Figure 22. Errors vs. Switching Rate with Front Buffer, 8-Channel
Differential Mode, 14 V Step
Figure 23. Errors vs. Switching Rate with Input Buffer, 8-Channel
Differential Mode, 2 V Step
From the figures above, we can see the circuit with the input
buffer has a better settling performance than the circuit without
front buffer at switching rates less than 1 MHz.
Figure 21, Figure 22, and Figure 23 show that with the input
buffer connected the circuit settles to 16 bits at channel-to-
channel switching rates up to 250 kHz.
COMMON VARIATIONS
The 18-bit AD7984 is available in a 10-lead MSOP or a 10-lead
QFN (LFCSP) package. There are a number of other PulSAR
ADCs available in the same package with 14-bit, 16-bit, and 18-
bit resolutions having various sampling rates.
Another possible choice for the buffer amplifiers is the AD8021.
If programmable gain is required, the AD8250, AD8251, and
AD8253 have 685 ns settling time to 0.001%. The ADG12xx
series of multiplexers can be used if lower capacitance is required.
80
–100
–80
–60
–40
–20
0
20
40
60
1000
0
100
200
300
400
500
600
700
800
900
SWITCHING RATE (kHz)
CH 2, 4, 6… 16 SETTLE TO –7V
CH 1, 3, 5… 15 SETTLE TO +7V
1000
0
100
200
300
400
500
600
700
800
900
30
–40
–30
–20
–10
0
10
20
SWITCHING RATE (kHz)
CH 2, 4, 6, 8 SETTLE TO –7V
CH 1, 3, 5, 7 SETTLE TO +7V
1000
0
100
200
300
400
500
600
700
800
900
SWITCHING RATE (kHz)
25
–30
–25
–20
–15
–10
–5
0
5
10
15
20
CH 2, 4, 6, ...16 SETTLE TO –7V
CH 1, 3, 5, ... 15 SETTLE TO +7V
1000
0
100
200
300
400
500
600
700
800
900
SWITCHING RATE (kHz)
25
–30
–25
–20
–15
–10
–5
0
5
10
15
20
CH 2, 4, 6, 8 SETTLE TO –7V
CH1, 3, 5, 7 SETTLE TO +7V
1000
0
100
200
300
400
500
600
700
800
900
6
–6
–4
–2
0
2
4
SWITCHING RATE (kHz)
CH 1, 3, 5, 7 SETTLE TO +1V
CH 2, 4, 6, 8 SETTLE TO –1V


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