參數(shù)資料
型號(hào)： EVAL-AD7622CBZ
廠商： Analog Devices Inc
文件頁數(shù)： 10/28頁
文件大小： 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 18 of 28
DRIVER AMPLIFIER CHOICE
Although the AD7622 is easy to drive, the driver amplifier
needs to meet the following requirements:
For multichannel, multiplexed applications, the driver
amplifier and the AD7622 analog input circuit must be
able to settle for a full-scale step of the capacitor array at an
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. The
AD8021 op amp, which combines ultralow noise and high
gain bandwidth, meets this settling time requirement even
when used with gains up to 13.
The noise generated by the driver amplifier needs to be
kept as low as possible to preserve the SNR and transition
noise performance of the AD7622. The noise coming from
the driver is filtered by the AD7622 analog input circuit
1-pole, low-pass filter made by RIN and CIN or by the
external filter, if one is used. The SNR degradation due
to the amplifier is
()
()
+
=
+
2
π
2
π
45
20log
N
3dB
N
3dB
LOSS
Ne
f
Ne
f
SNR
where:
f–3dB is the input bandwidth of the AD7622 (50 MHz) or
the cutoff frequency of the input RC filter shown in Figure 24
(3.9 MHz), if one is used.
N is the noise factor of the amplifier (1 in buffer
configuration).
eN+ and eN are the equivalent input voltage noise densities
of the op amps connected to IN+ and IN, in nV/√Hz.
This approximation can be used when the resistances used
around the amplifier are small. If larger resistances are
used, their noise contributions should also be root-sum
squared.
For instance, when using op amps with an equivalent input
noise density of 2.1 nV/√Hz, such as the AD8021, with a
noise gain of 1 when configured as a buffer, degrades the
SNR by only 0.1 dB when using the RC filter in Figure 24,
and by 1.3 dB without it.
The driver needs to have a THD performance suitable to
that of the AD7622. Figure 14 gives the THD vs. frequency
that the driver should exceed.
The AD8021 meets these requirements and is appropriate for
almost all applications. The AD8021 needs a 10 pF external
compensation capacitor that should have good linearity as an
NPO ceramic or mica type. Moreover, the use of a noninverting
1 gain arrangement is recommended and helps to obtain the
best signal-to-noise ratio.
The AD8022 can also be used when a dual version is needed
and a gain of 1 is present. The AD829 is an alternative in
applications where high frequency (above 100 kHz) performance is
not required. In applications with a gain of 1, an 82 pF
compensation capacitor is required. The AD8610 is an option
when low bias current is needed in low frequency applications.
Refer to Table 8 for some recommended op amps.
Table 8. Recommended Driver Amplifiers
Amplifier
Typical Application
Very low noise, low distortion, low power,
low frequency
Very low noise, low frequency
Very low noise, high frequency
Very low noise, high frequency, dual
Low bias current, low frequency, single/dual
Single-to-Differential Driver
For applications using unipolar analog signals, a single-ended-
to-differential driver, as shown in Figure 28, allows for a
differential input into the part. This configuration, when
provided an input signal of 0 to VREF, produces a differential
±VREF with midscale at VREF/2. The 1-pole filter using R = 15 Ω
and C = 2.7nF provides a corner frequency of 3.9 MHz.
If the application can tolerate more noise, the AD8139
differential driver can be used.
AD8021
ANALOG INPUT
(UNIPOLAR 0V TO 2.048V)
AD8021
IN+
IN–
AD7622
REF
10F
15
100nF
2.7nF
U2
U1
10pF
5k
590
0
602
3-
041
Figure 28. Single-Ended-to-Differential Driver Circuit
(Internal Reference Buffer Used)
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 類別:編程器，開發(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 類別:編程器，開發(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 類別:編程器，開發(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 類型:ADC 工具用于評(píng)估:ADS130E08 接口類型: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

*
*
*