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參數資料
| 型號： | AD7922AUJ-R2 |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | ADC |
| 英文描述： | ER 2C 2#16S PIN RECP |
| 中文描述： | 2-CH 12-BIT SUCCESSIVE APPROXIMATION ADC, SERIAL ACCESS, PDSO8 |
| 封裝： | MO-193BA, TSOT-8 |
| 文件頁數： | 24/32頁 |
| 文件大小： | 386K |
| 代理商： | AD7922AUJ-R2 |
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AD7912/AD7922
POWER VS. THROUGHPUT RATE
By using the power-down mode on the AD7912/AD7922 when
not converting, the average power consumption of the ADC
decreases at lower throughput rates. Figure 36 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.
Rev. 0 | Page 24 of 32
For example, if the AD7912/AD7922 are operating in a continu-
ous sampling mode with a throughput rate of 100 kSPS and a
SCLK of 18 MHz (V
DD
= 5 V), and the devices are placed in the
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 the power-up
time is one dummy cycle (1 μs), and the remaining conversion
time is another cycle (1 μs), then the AD7912/AD7922 dissipate
20 mW for 2 μs during each conversion cycle. If the throughput
rate is 100 kSPS and the cycle time is 10 μs, then the average
power dissipated during each cycle is
(2/10) × (20 mW) = 4 mW
If V
DD
= 3 V, SCLK = 18 MHz, and the device is again in power-
down mode between conversions, then the power dissipation
during normal operation is 6 mW. The AD7912/AD7922 now
dissipate 6 mW for 2 μs during each conversion cycle. With a
throughput rate of 100 kSPS, the average power dissipated
during each cycle is
(2/10) × (6 mW) = 1.2 mW
In the previous calculations, the power dissipation when the
part is in power-down mode has not been taken into account.
By placing the parts into power-down mode between conver-
sions, the average power consumed by the ADC decreases as
the throughput rate decreases, because the ADC remains in a
power-down state for a longer time.
Figure 36 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 330 kSPS and under, because at higher sampling
rates the short time spent in power-down does not affect the
average power consumed by the ADC.
100
0.01
0.1
1
10
0
50
100
150
200
250
300
350
0
THROUGHPUT (kSPS)
P
V
DD
= 5V, SCLK = 18MHz
V
DD
= 3V, SCLK = 18MHz
Figure 36. Power Consumption vs. Throughput Rate
相關PDF資料 |
PDF描述 |
|---|---|
| AD7912AUJ-R2 | 2-Channel, 2.35 V to 5.25 V, 1 MSPS, 10-/12-Bit ADCs |
| AD7922AUJ-REEL7 | Circular Connector; No. of Contacts:7; Series:; Body Material:Aluminum Alloy; Connecting Termination:Solder; Connector Shell Size:16S; Circular Contact Gender:Socket; Circular Shell Style:Wall Mount Receptacle |
| AD7912AUJ-REEL7 | Circular Connector; No. of Contacts:5; Series:; Body Material:Aluminum Alloy; Connecting Termination:Solder; Connector Shell Size:16S; Circular Contact Gender:Pin; Circular Shell Style:Wall Mount Receptacle; Insert Arrangement:16S-8 RoHS Compliant: No |
| AD7912 | 2-Channel, 2.35 V to 5.25 V, 1 MSPS, 10-/12-Bit ADCs |
| AD7912ARM | 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 |
|---|---|
| AD7922AUJ-REEL | 制造商:Analog Devices 功能描述:ADC Single SAR 1Msps 12-bit Serial 8-Pin TSOT T/R |
| AD7922AUJ-REEL7 | 制造商:Analog Devices 功能描述:ADC Single SAR 1Msps 12-bit Serial 8-Pin TSOT T/R 制造商:Rochester Electronics LLC 功能描述:DUAL 12-BIT, 1MSPS, ADC I.C - Tape and Reel |
| AD7922AUJZ-REEL7 | 功能描述:IC ADC DUAL 12BIT 2CH TSOT-23-8 RoHS:是 類別:集成電路 (IC) >> 數據采集 - 模數轉換器 系列:- 其它有關文件:TSA1204 View All Specifications 標準包裝:1 系列:- 位數:12 采樣率（每秒）:20M 數據接口:并聯 轉換器數目:2 功率耗散（最大）:155mW 電壓電源:模擬和數字 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:48-TQFP 供應商設備封裝:48-TQFP（7x7） 包裝:Digi-Reel® 輸入數目和類型:4 個單端，單極；2 個差分，單極 產品目錄頁面:1156 (CN2011-ZH PDF) 其它名稱:497-5435-6 |
| AD7923 | 制造商:AD 制造商全稱:Analog Devices 功能描述:4-Channel, 200 kSPS, 12-Bit ADC with Sequencer in 16-Lead TSSOP |
| AD7923_11 | 制造商:AD 制造商全稱:Analog Devices 功能描述:4-Channel, 200 kSPS 12-Bit ADC with Sequencer in 16-Lead TSSOP |
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