參數(shù)資料
型號(hào)： EVAL-AD7622CBZ
廠商： Analog Devices Inc
文件頁(yè)數(shù)： 9/28頁(yè)
文件大?。?/td> 0K
描述： BOARD EVALUATION FOR AD7622
標(biāo)準(zhǔn)包裝： 1
系列： PulSAR®
ADC 的數(shù)量： 1
位數(shù)： 16
采樣率（每秒）： 2M
數(shù)據(jù)接口： 串行，并聯(lián)
輸入范圍： ±VREF
在以下條件下的電源（標(biāo)準(zhǔn)）： 70mW @ 2MSPS
工作溫度： -40°C ~ 85°C
已用 IC / 零件： AD7622
已供物品： 板
相關(guān)產(chǎn)品： AD7622BSTZ-ND - IC ADC 16BIT DIFFERENTIAL 48LQFP
AD7622BCPZ-ND - IC ADC 16BIT DIFFERENTL 48-LFCSP
AD7622BSTZRL-ND - IC ADC 16BIT DIFFERENTL 48-LQFP
AD7622BCPZRL-ND - IC ADC 16BIT DIFFERENTL 48-LFCSP
AD7622
Rev. 0 | Page 17 of 28
TYPICAL CONNECTION DIAGRAM
Figure 24 shows a typical connection diagram for the AD7622.
Different circuitry shown in this diagram is optional and is
discussed in the following sections.
ANALOG INPUTS
Figure 25 shows an equivalent circuit of the input structure of
the AD7622.
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 causes the diodes to become forward-
biased and to start conducting current. These diodes can handle
a forward-biased current of 100 mA maximum. For instance,
these conditions could eventually occur when the input buffer’s
U1 or U2 supplies are different from AVDD. In such a case, an
input buffer with a short-circuit current limitation can be used
to protect the part.
D1
RIN
CIN
D2
IN+ OR IN–
AGND
AVDD
CPIN
06
02
3-
02
4
Figure 25. AD7622 Simplified Analog Input
The analog input of the AD7622 is a true differential structure.
By using this differential input, small signals common to both
inputs are rejected, as shown in Figure 26, representing the
typical CMRR over frequency with internal and external references.
75
45
1
10000
FREQUENCY (kHz)
CM
R
(
d
B)
10
100
1000
50
55
60
65
70
06
02
3-
02
5
INT REF
EXT REF
Figure 26. Analog Input CMRR vs. Frequency
During the acquisition phase for ac signals, the impedance of
the analog inputs, IN+ and IN, can be modeled as a parallel
combination of capacitor CPIN and the network formed by the
series connection of RIN and CIN. CPIN is primarily the pin
capacitance. RIN is typically 175 Ω and is a lumped component
comprised of some serial resistors and the on resistance of the
switches. CIN is typically 12 pF and is mainly the ADC sampling
capacitor. During the conversion phase, when the switches are
opened, the input impedance is limited to CPIN. RIN and CIN
make a 1-pole, low-pass filter that has a typical 3 dB cutoff
frequency of 50 MHz, thereby reducing an undesirable aliasing
effect and limiting the noise coming from the inputs.
Because the input impedance of the AD7622 is very high, the
AD7622 can be directly driven by a low impedance source
without gain error. To further improve the noise filtering achieved
by the AD7622’s analog input circuit, an external 1-pole RC
filter between the amplifier’s outputs and the ADC analog
inputs can be used, as shown in Figure 24. However, large source
impedances significantly affect the ac performance, especially
the total harmonic distortion (THD). The maximum source
impedance depends on the amount of THD that can be
tolerated. The THD degrades as a function of the source
impedance and the maximum input frequency, as shown in
–60
–105
1
1000
T
HD
(
d
B)
10
100
–95
–85
–75
–65
–100
–90
–80
–70
06
02
3-
0
26
INPUT FREQUENCY (kHz)
RS = 500
RS = 100
RS = 50
RS = 15
Figure 27. THD vs. Analog Input Frequency and Source Resistance
MULTIPLEXED INPUTS
When using the full 2 MSPS throughput in multiplexed
applications for a full-scale step, the RC filter, as shown in
Figure 24, does not settle in the required acquisition time, t8.
These values are chosen to optimize the best SNR performance
of the AD7622. To use the full 2 MSPS throughput in multiplexed
applications, the RC should be adjusted to satisfy t8 (which is
~ 7 × RC time constant). However, lowering R and C increases
the RC filter bandwidth and allows more noise into the AD7622,
which degrades SNR. To preserve the SNR performance in these
applications using the RC filter shown in Figure 24, the AD7622
should be run with t8 > 280 ns; or approximately 1/(t7 + t8) ~
1.55 MSPS in wideband and warp modes.
相關(guān)PDF資料
PDF描述
RBC08DREN-S93 CONN EDGECARD 16POS .100 EYELET
RSC05DREH-S93 CONN EDGECARD 10POS .100 EYELET
0210490995 CABLE JUMPER 1.25MM .127M 29POS
RMC05DREH-S93 CONN EDGECARD 10POS .100 EYELET
MLG1005SR20J INDUCTOR MULTILAYER .20UH 0402
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
EVAL-AD7622EDZ 功能描述:BOARD EVAL FOR AD7622 RoHS:是 類(lèi)別:編程器，開(kāi)發(fā)系統(tǒng) >> 評(píng)估板 - 模數(shù)轉(zhuǎn)換器 (ADC) 系列:* 產(chǎn)品培訓(xùn)模塊:Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:1 系列:- ADC 的數(shù)量:1 位數(shù):12 采樣率（每秒）:94.4k 數(shù)據(jù)接口:USB 輸入范圍:±VREF/2 在以下條件下的電源（標(biāo)準(zhǔn)）:- 工作溫度:-40°C ~ 85°C 已用 IC / 零件:MAX11645 已供物品:板，軟件
EVAL-AD7623CB 制造商:Analog Devices 功能描述:EVAL KIT FOR 16BIT, 1.33 MSPS PULSAR ADC - Trays
EVAL-AD7623CBZ 功能描述:BOARD EVALUATION FOR AD7623 RoHS:是 類(lèi)別:編程器，開(kāi)發(fā)系統(tǒng) >> 評(píng)估板 - 模數(shù)轉(zhuǎn)換器 (ADC) 系列:PulSAR® 產(chǎn)品培訓(xùn)模塊:Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:1 系列:- ADC 的數(shù)量:1 位數(shù):12 采樣率（每秒）:94.4k 數(shù)據(jù)接口:USB 輸入范圍:±VREF/2 在以下條件下的電源（標(biāo)準(zhǔn)）:- 工作溫度:-40°C ~ 85°C 已用 IC / 零件:MAX11645 已供物品:板，軟件
EVAL-AD7623EDZ 功能描述:BOARD EVAL FOR AD7623 RoHS:是 類(lèi)別:編程器，開(kāi)發(fā)系統(tǒng) >> 評(píng)估板 - 模數(shù)轉(zhuǎn)換器 (ADC) 系列:* 產(chǎn)品培訓(xùn)模塊:Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:1 系列:- ADC 的數(shù)量:1 位數(shù):12 采樣率（每秒）:94.4k 數(shù)據(jù)接口:USB 輸入范圍:±VREF/2 在以下條件下的電源（標(biāo)準(zhǔn)）:- 工作溫度:-40°C ~ 85°C 已用 IC / 零件:MAX11645 已供物品:板，軟件
EVAL-AD7625EDZ 功能描述:數(shù)據(jù)轉(zhuǎn)換 IC 開(kāi)發(fā)工具 Eval Board 16-BIT 5MSPS ADC I.C RoHS:否 制造商:Texas Instruments 產(chǎn)品:Demonstration Kits 類(lèi)型:ADC 工具用于評(píng)估:ADS130E08 接口類(lèi)型:SPI 工作電源電壓:- 6 V to + 6 V
發(fā)布緊急采購(gòu)，3分鐘左右您將得到回復(fù)。

采購(gòu)需求

(若只采購(gòu)一條型號(hào)，填寫(xiě)一行即可)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

*型號(hào) *數(shù)量 廠商 批號(hào) 封裝
添加更多采購(gòu)

我的聯(lián)系方式

*
*
*