- 您現在的位置：買賣IC網 > PDF目錄373926 > AD7921ARM-REEL7 (ANALOG DEVICES INC) 2-Channel, 2.35 V to 5.25 V 250 kSPS, 10-/12-Bit ADCs PDF資料下載
參數資料
| 型號： | AD7921ARM-REEL7 |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | ADC |
| 英文描述： | 2-Channel, 2.35 V to 5.25 V 250 kSPS, 10-/12-Bit ADCs |
| 中文描述： | 2-CH 12-BIT SUCCESSIVE APPROXIMATION ADC, SERIAL ACCESS, PDSO8 |
| 封裝： | MO-187AA, MSOP-8 |
| 文件頁數： | 20/28頁 |
| 文件大小： | 312K |
| 代理商： | AD7921ARM-REEL7 |
第1頁第2頁第3頁第4頁第5頁第6頁第7頁第8頁第9頁第10頁第11頁第12頁第13頁第14頁第15頁第16頁第17頁第18頁第19頁當前第20頁第21頁第22頁第23頁第24頁第25頁第26頁第27頁第28頁
AD7911/AD7921
POWER VS. THROUGHPUT RATE
By using the power-down mode on the AD7911/AD7921 when
not converting, the average power consumption of the ADC
decreases at lower throughput rates. Figure 29 shows how, as the
throughput rate is reduced, the device remains in its power-
down state longer and the average power consumption over
time drops accordingly.
Rev. 0 | Page 20 of 28
For example, if the AD7911/AD7921 are operating in a
continuous sampling mode with a throughput rate of 50 kSPS
and a SCLK of 5 MHz (V
DD
= 5 V) and the devices are placed in
power-down mode between conversions, then the power
consumption is calculated as follows. The power dissipation
during normal operation is 20 mW (V
DD
= 5 V). If one dummy
cycle powers up the part between conversions (3.2 μs), and the
remaining conversion time is another cycle (3.2 μs), then the
AD7911/AD7921 dissipate 20 mW for 6.4 μs during each
conversion cycle. If the throughput rate is 50 kSPS and the cycle
time is 20 μs, then the average power dissipated during each
cycle is
(6.4/20) × (20 mW) = 6.4 mW
If V
DD
= 3 V, SCLK= 5 MHz, and the device is again in power-
down mode between conversions, then the power dissipation
during normal operation is 6 mW. The AD7911/AD7921 now
dissipate 6 mW for 6.4 μs during each conversion cycle. With a
throughput rate of 50 kSPS, the average power dissipated during
each cycle is
(6.4/20) × (6 mW) = 1.92 mW
In the previous examples, the power dissipation when the part is
in power-down mode has not been taken into account, because
the shutdown current is so low that it does not have any effect
on the overall power dissipation value. Figure 29 shows the
power consumption versus throughput rate when using the
power-down mode between conversions with both 5 V and 3 V
supplies.
Power-down mode is intended for use with throughput rates of
approximately 120 kSPS and under, because higher sampling
rates do not have a power saving in power-down mode.
0.01
100
10
1
0.1
0
135
120
105
90
75
60
45
THROUGHPUT (kSPS)
30
15
0
P
V
DD
= 5V, SCLK = 5MHz
V
DD
= 3V, SCLK = 5MHz
Figure 29. Power Consumption vs. Throughput Rate
相關PDF資料 |
PDF描述 |
|---|---|
| AD7921AUJ-R2 | 2-Channel, 2.35 V to 5.25 V 250 kSPS, 10-/12-Bit ADCs |
| AD7921AUJ-REEL7 | 2-Channel, 2.35 V to 5.25 V 250 kSPS, 10-/12-Bit ADCs |
| AD7911 | 2-Channel, 2.35 V to 5.25 V 250 kSPS, 10-/12-Bit ADCs |
| AD7922AUJ-R2 | ER 2C 2#16S PIN RECP |
| AD7912AUJ-R2 | 2-Channel, 2.35 V to 5.25 V, 1 MSPS, 10-/12-Bit ADCs |
相關代理商/技術參數 |
參數描述 |
|---|---|
| AD7921ARMZ | 功能描述:IC ADC 12BIT DUAL LP 8-MSOP RoHS:是 類別:集成電路 (IC) >> 數據采集 - 模數轉換器 系列:- 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 |
| AD7921ARMZ-REEL | 功能描述:IC ADC 12BIT DUAL LP 8MSOP RoHS:是 類別:集成電路 (IC) >> 數據采集 - 模數轉換器 系列:- 產品培訓模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝:2,500 系列:- 位數:12 采樣率（每秒）:3M 數據接口:- 轉換器數目:- 功率耗散（最大）:- 電壓電源:- 工作溫度:- 安裝類型:表面貼裝 封裝/外殼:SOT-23-6 供應商設備封裝:SOT-23-6 包裝:帶卷 (TR) 輸入數目和類型:- |
| AD7921ARMZ-REEL7 | 功能描述:IC ADC 12BIT DUAL LP 8MSOP RoHS:是 類別:集成電路 (IC) >> 數據采集 - 模數轉換器 系列:- 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 |
| AD7921AUJ-R2 | 制造商:Analog Devices 功能描述: 制造商:Rochester Electronics LLC 功能描述:DUAL 12-BIT , 250KSPS ADC I.C. - Bulk |
| AD7921AUJ-REEL7 | 制造商:Analog Devices 功能描述:ADC Single SAR 250ksps 12-bit Serial 8-Pin TSOT T/R |
發布緊急采購，3分鐘左右您將得到回復。