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參數(shù)資料
| 型號(hào)： | AD7683BRMZRL7 |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 5/16頁 |
| 文件大小： | 0K |
| 描述： | IC ADC 16BIT SAR 100KSPS 8MSOP |
| 產(chǎn)品培訓(xùn)模塊： | ADC Applications ADC Architectures ADC DC/AC Performance Power Line Monitoring |
| 標(biāo)準(zhǔn)包裝： | 1,000 |
| 系列： | PulSAR® |
| 位數(shù)： | 16 |
| 采樣率（每秒）： | 100k |
| 數(shù)據(jù)接口： | DSP，MICROWIRE?，QSPI?，串行，SPI? |
| 轉(zhuǎn)換器數(shù)目： | 1 |
| 功率耗散（最大）： | 6mW |
| 電壓電源： | 單電源 |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 8-TSSOP，8-MSOP（0.118"，3.00mm 寬） |
| 供應(yīng)商設(shè)備封裝： | 8-MSOP |
| 包裝： | 帶卷 (TR) |
| 輸入數(shù)目和類型： | 1 個(gè)偽差分，單極 |
AD7683
Rev. A | Page 13 of 16
04
30
1-
02
2
AD7683
REF
GND
VDD
–IN
+IN
DCLOCK
DOUT
CS
3-WIRE INTERFACE
100nF
2.7V TO 5.25V
CREF
2.2F TO 10F
(NOTE 2)
REF
0V TO VREF
33
2.7nF
(NOTE 3)
(NOTE 4)
(NOTE 1)
NOTES
1. SEE VOLTAGE REFERENCE INPUT SECTION FOR REFERENCE SELECTION.
2. CREF IS USUALLY A 10F CERAMIC CAPACITOR (X5R).
3. SEE DRIVER AMPLIFIER CHOICE SECTION.
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 protec-
tion 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 these diodes to become
forward-biased and start conducting current. However, these
diodes can handle a forward-biased current of 130 mA maximum.
For instance, these conditions can eventually occur when the
input buffer (U1) supplies are different from VDD. In such a
case, use an input buffer with a short-circuit current limitation
to protect the part.
04301-023
CIN
RIN
D1
D2
CPIN
+IN
OR –IN
GND
VDD
Figure 23. Equivalent Analog Input Circuit
This analog input structure allows the sampling of the differen-
tial 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
Capacitor CPIN and the network formed by the series connection
of RIN and CIN. CPIN is primarily the pin capacitance. RIN is typically
600 Ω and is a lumped component consisting of some serial
resistors and the on resistance of the switches. CIN is typically
30 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 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 to preserve the SNR and transition
noise performance of the AD7683. Note that the AD7683
has a noise figure 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 RIN
and CIN 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 vs. 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 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.
Table 10. Recommended Driver Amplifiers
Amplifier
Typical Application
Very low noise and low power
Low power, low noise, and low frequency
5 V single-supply, low power
Low power and low frequency
High frequency and low power
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AD7684 | 制造商:AD 制造商全稱:Analog Devices 功能描述:3mW, 100kSPS, 14-Bit ADC in 6-Lead SOT-23 |
| AD7684BRM | 制造商:Analog Devices 功能描述:ADC Single SAR 100ksps 16-bit Serial 8-Pin MSOP 制造商:Analog Devices 功能描述:IC 16-BIT ADC |
| AD7684BRMRL | 制造商:AD 制造商全稱:Analog Devices 功能描述:16-Bit, 100 kSPS PulSAR, Differential ADC in MSOP |
| AD7684BRMRL7 | 制造商:Analog Devices 功能描述:ADC Single SAR 100ksps 16-bit Serial 8-Pin MSOP T/R |
| AD7684BRMZ | 功能描述:IC ADC 16BIT 100KSPS DIFF 8MSOP RoHS:是 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - 模數(shù)轉(zhuǎn)換器 系列:PulSAR® 標(biāo)準(zhǔn)包裝:1 系列:microPOWER™ 位數(shù):8 采樣率（每秒）:1M 數(shù)據(jù)接口:串行，SPI? 轉(zhuǎn)換器數(shù)目:1 功率耗散（最大）:- 電壓電源:模擬和數(shù)字 工作溫度:-40°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:24-VFQFN 裸露焊盤 供應(yīng)商設(shè)備封裝:24-VQFN 裸露焊盤（4x4） 包裝:Digi-Reel® 輸入數(shù)目和類型:8 個(gè)單端，單極 產(chǎn)品目錄頁面:892 (CN2011-ZH PDF) 其它名稱:296-25851-6 |
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