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參數資料
| 型號： | AD7621AST |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | ADC |
| 英文描述： | 16-Bit, 1 LSB INL, 3 MSPS PulSAR ADC |
| 中文描述： | 1-CH 16-BIT SUCCESSIVE APPROXIMATION ADC, SERIAL/PARALLEL ACCESS, PQFP48 |
| 封裝： | MO-026-BBC, LQFP-48 |
| 文件頁數： | 19/26頁 |
| 文件大?。?/td> | 265K |
| 代理商： | AD7621AST |
REV. Pr D
PRELIMINARY TECHNICAL DATA
AD7621
–19–
In both cases, the voltage reference input REF has a dy-
namic input impedance and requires, therefore, an
efficient decoupling between REF and REFGND inputs.
When the internal reference buffer is used, this decoupling
consists of a 10 μF ceramic capacitor ( e.g. : Panasonic
ECJ-3xB0J106 1206 size ).
When external reference is used, the decoupling consists
of a low ESR 47 μF tantalum capacitor connected to the
REF and REFGND inputs with minimum parasitic induc-
tance.
Temperature Sensor
The TEMP pin, which measures the temperature of the
AD7621, can be used as shown in figure 9. The output of
the TEMP pin is applied to one of the inputs of the ana-
log switch (e.g. : ADG779) and the ADC itself is used to
measure its own temperature. This configuration could be
very useful to improve the calibration accuracy over the
temperature range.
To Be Supplied
Figure 9. Use of the Temperature Sensor
Power Supply
The AD7621 uses three sets of power supply pins: an ana-
log 2.5 V supply AVDD, a digital 2.5 V core supply
DVDD, and a digital input/output interface supply
OVDD. The OVDD supply allows direct interface with
any logic working between 2.3 V and 5.25 V. To reduce
the number of supplies needed, the digital core (DVDD)
can be supplied through a simple RC filter from the ana-
log supply as shown in Figure 5. The AD7621 is
independent of power supply sequencing and thus free
from supply voltage induced latchup. Additionally, it is
very insensitive to power supply variations over a wide
frequency range as shown in Figure 10.
To Be Supplied
Figure 10. PSRR vs. Frequency
POWER DISSIPATION Vs. THROUGHPUT
In Impulse mode, the AD7621 automatically reduces its
power consumption at the end of each conversion phase.
During the acquisition phase, the operating currents are
very low which allows a significant power saving when the
conversion rate is reduced as shown in Figure 11. This
feature makes the AD7621 ideal for very low-power bat-
tery applications.
It should be noted that the digital interface remains active
even during the acquisition phase. To reduce the operat-
ing digital supply currents even further, the digital inputs
need to be driven close to the power rails (i.e., DVDD
and DGND).
To Be Supplied
Figure 11. Power Dissipation vs. Sample Rate
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相關代理商/技術參數 |
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| AD7621ASTRL | 制造商:Analog Devices 功能描述:ADC Single SAR 3Msps 16-bit Parallel/Serial 48-Pin LQFP T/R |
| AD7621ASTZ | 功能描述:IC ADC 16BIT 2MSPS DIFF 48-LQFP RoHS:是 類別:集成電路 (IC) >> 數據采集 - 模數轉換器 系列:PulSAR® 標準包裝:1 系列:microPOWER™ 位數:8 采樣率（每秒）:1M 數據接口:串行，SPI? 轉換器數目:1 功率耗散（最大）:- 電壓電源:模擬和數字 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 供應商設備封裝:24-VQFN 裸露焊盤（4x4） 包裝:Digi-Reel® 輸入數目和類型:8 個單端，單極 產品目錄頁面:892 (CN2011-ZH PDF) 其它名稱:296-25851-6 |
| AD7621ASTZ1 | 制造商:AD 制造商全稱:Analog Devices 功能描述:16-Bit, 2 LSB INL, 3 MSPS PulSAR?? ADC |
| AD7621ASTZRL | 功能描述:IC ADC 16BIT 2MSPS DIFF 48LQFP RoHS:是 類別:集成電路 (IC) >> 數據采集 - 模數轉換器 系列:PulSAR® 標準包裝:1 系列:- 位數:14 采樣率（每秒）:83k 數據接口:串行，并聯 轉換器數目:1 功率耗散（最大）:95mW 電壓電源:雙 ± 工作溫度:0°C ~ 70°C 安裝類型:通孔 封裝/外殼:28-DIP（0.600"，15.24mm） 供應商設備封裝:28-PDIP 包裝:管件 輸入數目和類型:1 個單端，雙極 |
| AD7621ASTZRL1 | 制造商:AD 制造商全稱:Analog Devices 功能描述:16-Bit, 2 LSB INL, 3 MSPS PulSAR?? ADC |
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