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參數(shù)資料
| 型號： | AD7843ARQZ-REEL |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 8/21頁 |
| 文件大小： | 0K |
| 描述： | IC ADC 12BIT TOUCHSCREEN 16-QSOP |
| 標(biāo)準(zhǔn)包裝： | 2,500 |
| 類型： | 電阻 |
| 觸摸面板接口： | 4 線 |
| 輸入數(shù)/鍵： | 1 TSC |
| 分辨率（位）： | 12 b |
| 評估套件： | 可供 |
| 數(shù)據(jù)接口： | 串行 |
| 數(shù)據(jù)速率/采樣率 (SPS，BPS)： | 125k |
| 電壓基準(zhǔn)： | 外部 |
| 電源電壓： | 2.2 V ~ 5.25 V |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 16-SSOP（0.154"，3.90mm 寬） |
| 供應(yīng)商設(shè)備封裝： | 16-QSOP |
| 包裝： | 帶卷 (TR) |
| 配用： | EVAL-AD7843EBZ-ND - BOARD EVAL FOR AD7843 |
AD7843
Rev. B | Page 15 of 20
POWER VS. THROUGHPUT RATE
By using the power-down options on the AD7843 when not
converting, the average power consumption of the device
decreases at lower throughput rates. Figure 23 shows how, as the
throughput rate is reduced while maintaining the DCLK
frequency at 2 MHz, the device remains in its power-down state
longer and the average current consumption over time drops
accordingly.
For example, if the AD7843 is operated in a 24 DCLK
continuous sampling mode, with a throughput rate of 10 kSPS
and a SCLK of 2 MHz, and the device is placed in the power-
down mode between conversions, (PD0, PD1 = 0, 0), the current
consumption is calculated as follows. The power dissipation
during normal operation is typically 210 A (VCC = 2.7 V). The
power-up time of the ADC is instantaneous, so when the part is
converting, it consumes 210 A. In this mode of operation, the
part powers up on the fourth falling edge of DCLK after the
start bit is recognized. It goes back into power-down at the end
of conversion on the 20th falling edge of DCLK. This means the
part consumes 210 A for 16 DCLK cycles only, 8 s, during
each conversion cycle. With a throughput rate of 10 kSPS, the
cycle time is 100 s and the average power dissipated during
each cycle is (8/100) × (210 A) = 16.8 A.
S
U
P
L
Y
CURRE
NT
(
A)
1
100
10
1000
0
120
THROUGHPUT (kSPS)
02144-B
-023
40
60
0
20
80
100
fDCLK = 16 × fSAMPLE
fDCLK = 2MHz
VCC = 2.7V
TA = –40°C TO +95°C
Figure 23. Supply Current vs. Throughput (A)
Table 7. Power Management Options
PD1
PD0
PENIRQ
Description
0
Enabled
This configuration results in power-down of the device between conversions. The AD7843 only powers down
between conversions. Once PD1 and PD0 are set to 0, 0, the conversion is performed first, and the AD7843
powers down upon completion of that conversion. At the start of the next conversion, the ADC instantly powers
up to full power. This means there is no need for additional delays to ensure full operation, and the very first
conversion is valid. The Y switch is on while in power-down.
0
1
Disabled
This configuration results in the same behavior as when PD1 and PD0 have been programmed with 0, 0, except
that PENIRQ is disabled. The Y switch is off while in power-down.
1
0
Enabled
This configuration results in keeping the AD7843 permanently powered up with PENIRQ enabled.
1
Disabled
This configuration results in keeping the AD7843 always powered up with PENIRQ disabled.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AD7843ARQZ-REEL2 | 制造商:AD 制造商全稱:Analog Devices 功能描述:Touch Screen Digitizer |
| AD7843ARQZ-REEL7 | 功能描述:IC ADC 12BIT TOUCHSCREEN 16-QSOP RoHS:是 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - 觸摸屏控制器 系列:- 標(biāo)準(zhǔn)包裝:96 系列:- 類型:- 觸摸面板接口:- 輸入數(shù)/鍵:- 分辨率（位）:- 評估套件:* 數(shù)據(jù)接口:- 數(shù)據(jù)速率/采樣率 (SPS，BPS):- 電壓基準(zhǔn):- 電源電壓:- 電流 - 電源:- 工作溫度:- 安裝類型:表面貼裝 封裝/外殼:16-TSSOP（0.173"，4.40mm 寬） 供應(yīng)商設(shè)備封裝:16-TSSOP 包裝:帶卷 (TR) |
| AD7843ARQZ-REEL72 | 制造商:AD 制造商全稱:Analog Devices 功能描述:Touch Screen Digitizer |
| AD7843ARU | 制造商:Analog Devices 功能描述:TOUCH SCREEN DIGITIZER 制造商:Rochester Electronics LLC 功能描述:2.7V 12-BIT ADC TOUCH SCR - Bulk 制造商:Analog Devices 功能描述:IC 12-BIT ADC |
| AD7843ARU-REEL | 制造商:Rochester Electronics LLC 功能描述:2.7V 12-BIT ADC TOUCH SCR - Tape and Reel |
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