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參數(shù)資料
| 型號： | EVAL-CONTROLBRD3 |
| 廠商： | Analog Devices, Inc. |
| 元件分類： | ADC |
| 英文描述： | 16-Bit, 100 kSPS PulSAR ADC in MSOP/QFN |
| 中文描述： | 16位，100 kSPS的PulSAR系列ADC的，采用MSOP / QFN封裝 |
| 文件頁數(shù)： | 13/16頁 |
| 文件大?。?/td> | 467K |
| 代理商： | EVAL-CONTROLBRD3 |
AD7683
Rev. 0 | Page 13 of 16
0
AD7683
REF
GND
VDD
–IN
+IN
DCLOCK
D
OUT
CS
3-WIRE INTERFACE
100nF
2.7V TO 5.25V
2.2 TO 10
μ
F
(NOTE 2)
REF
0 TO V
REF
33
2.7nF
(NOTE 3)
(NOTE 4)
(NOTE 1)
NOTE 1: SEE REFERENCE SECTION FOR REFERENCE SELECTION.
NOTE 2: C
IS USUALLY A 10
μ
F CERAMIC CAPACITOR (X5R).
NOTE 3: SEE DRIVER AMPLIFIER CHOICE SECTION.
NOTE 4. OPTIONAL FILTER. SEE ANALOG INPUT SECTION.
Figure 22. Typical Application Diagram
TYPICAL CONNECTION DIAGRAM
Figure 22 shows an example of the recommended application
diagram for the AD7683.
ANALOG INPUT
Figure 23 shows an equivalent circuit of the input structure of
the AD7683.
The two diodes, D1 and D2, provide ESD protection for the
analog inputs, +IN and IN. Care must be taken to ensure that
the analog input signal never exceeds the supply rails by more
than 0.3 V, because this will cause these diodes to become for-
ward-biased and start conducting current. However, these
diodes can handle a forward-biased current of 130 mA maxi-
mum. For instance, these conditions could eventually occur
when the input buffer’s (U1) supplies are different from VDD.
In such a case, an input buffer with a short-circuit current
limitation can be used to protect the part.
0
C
IN
R
IN
D1
D2
C
PIN
+IN
OR –IN
GND
VDD
Figure 23. Equivalent Analog Input Circuit
This analog input structure allows the sampling of the
differential signal between +IN and IN. By using this
differential input, small signals common to both inputs are
rejected. For instance, by using IN to sense a remote signal
ground, ground potential differences between the sensor and
the local ADC ground are eliminated. During the acquisition
phase, the impedance of the analog input +IN can be modeled
as a parallel combination of the capacitor C
PIN
and the network
formed by the series connection of R
IN
and C
IN
. C
PIN
is primarily
the pin capacitance. R
IN
is typically 600 and is a lumped com-
ponent made up of some serial resistors and the on-resistance
of the switches. C
IN
is typically 30 pF and is mainly the ADC
sampling capacitor. During the conversion phase, where the
switches are opened, the input impedance is limited to C
PIN
. R
IN
and C
IN
make a 1-pole, low-pass filter that reduces undesirable
aliasing effects and limits the noise.
When the source impedance of the driving circuit is low, the
AD7683 can be driven directly. Large source impedances signi-
ficantly affect the ac performance, especially THD. The dc
performances are less sensitive to the input impedance.
DRIVER AMPLIFIER CHOICE
Although the AD7683 is easy to drive, the driver amplifier
needs to meet the following requirements:
The noise generated by the driver amplifier needs to be
kept as low as possible in order to preserve the SNR and
transition noise performance of the AD7683. Note that the
AD7683 has a noise much lower than most other 16-bit
ADCs and, therefore, can be driven by a noisier op amp
while preserving the same or better system performance.
The noise coming from the driver is filtered by the AD7683
analog input circuit 1-pole, low-pass filter made by R
IN
and
C
IN
or by the external filter, if one is used.
For ac applications, the driver needs to have a THD
performance suitable to that of the AD7683. Figure 15
shows the THD versus frequency that the driver should
exceed.
For multichannel multiplexed applications, the driver
amplifier and the AD7683 analog input circuit must be able
to settle for a full-scale step of the capacitor array at a
16-bit level (0.0015%). In the amplifier’s data sheet, settling
at 0.1% to 0.01% is more commonly specified. This could
differ significantly from the settling time at a 16-bit level
and should be verified prior to driver selection.
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相關代理商/技術參數(shù) |
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|---|---|
| EVAL-CONTROLBRD32 | 制造商:AD 制造商全稱:Analog Devices 功能描述:16-Bit, 250 kSPS PulSAR?? ADC in MSOP |
| EVAL-CONTROLBRD33 | 制造商:AD 制造商全稱:Analog Devices 功能描述:16-Bit, 2 LSB INL, 3 MSPS PulSAR?? ADC |
| EVAL-CONTROLBRD3Z | 制造商:Analog Devices 功能描述:LINEAR ICS - EVALUATION BOARD |
| EVAL-CONTROLBRD3Z1 | 制造商:AD 制造商全稱:Analog Devices 功能描述:16-Bit, 100 kSPS PulSAR, Differential ADC in MSOP |
| EVAL-CONTROLBRD3Z3 | 制造商:AD 制造商全稱:Analog Devices 功能描述:18-Bit, 2.5 LSB INL, 800 kSPS SAR ADC |
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