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參數資料
| 型號： | AD7888BRU |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | ADC |
| 英文描述： | +2.7 V to +5.25 V, Micropower, 8-Channel, 125 kSPS, 12-Bit ADC in 16-Lead TSSOP |
| 中文描述： | 8-CH 12-BIT SUCCESSIVE APPROXIMATION ADC, SERIAL ACCESS, PDSO16 |
| 封裝： | TSSOP-16 |
| 文件頁數： | 12/16頁 |
| 文件大小： | 164K |
| 代理商： | AD7888BRU |
REV. 0
AD7888
–12–
CS
and the second rising edge of SCLK as shown in Figure 14a.
In microcontroller applications, this is readily achievable by
driving the
CS
input from one of the port lines and ensuring
that the serial data read (from the microcontrollers serial port) is
not initiated for 5
μ
s. In DSP applications, where the
CS
is
generally derived from the serial frame synchronization line, it is
not possible to separate the first falling edge and second rising
edge of SCLK after the
CS
falling edge by up to 5
μ
s. There-
fore, the user will need to write to the Control Register to exit
this mode and (by writing PM1 = 0 and PM0 = 0) put the part
into normal mode. A second conversion will then need to be
initiated when the part is powered up to obtain a conversion
result as shown in Figure 14b.
SCLK
4 LEADING ZEROES
+ CONVERSION RESULT
CS
DOUT
DATA IN
DIN
1
16
8
4 LEADING ZEROES
+ CONVERSION RESULT
DATA IN
1
16
8
4 LEADING ZEROES
+ CONVERSION RESULT
DATA IN
1
16
8
PM1 AND PM0 = 0 TO PLACE
PM1 = 1 AND PM0 = 0 TO
PLACE THE PART BACK IN
AUTOSHUTDOWN MODE
CONTROL REGISTER DATA IS LOADED ON
THE FIRST 8 CLOCKS. PM1 = 1 AND PM0 = 0
THE PART ENTERS
SHUTDOWN AT THE END
OF CONVERSION AS
PM1 = 1 AND PM0 = 0
THE PART REMAINS POWERED
UP AS PM1 AND PM0 = 0
THE PART BEGINS TO POWER-
UP FROM SHUTDOWN
THE PART ENTERS
SHUTDOWN AT THE END OF
CONVERSION AS PM1 = 1
AND PM0 = 0
Figure 14b. Autoshutdown Operation
SCLK
4 LEADING ZEROES + CONVERSION RESULT
CS
DOUT
DATA IN
DIN
CONTROL REGISTER DATA IS LOADED ON
THE FIRST 8 CLOCKS. PM1 = 1 AND PM0 = 1
1
16
4 LEADING ZEROES + CONVERSION RESULT
DATA IN
PM1 = 1 AND PM0 = 1 TO KEEP
THE PART IN THIS MODE
1
16
THE PART POWERS UP
FROM STANDBY ON SCLK
FALLING EDGE AS PM1 = 1
AND PM0 = 1
THE PART ENTERS
STANDBY AT THE END OF
CONVERSION AS
PM1 = 1 AND PM0 = 1
Figure 15. Autostandby Operation
Autostandby (PM1 = 1, PM0 = 1)
In this mode, the AD7888 automatically enters a standby (or
sleep) mode at the end of every conversion. In this standby
mode, all on-chip circuitry, apart from the on-chip reference, is
powered down. This mode is similar to the autoshutdown but
in this case, the power-up time is much shorter as the on-chip
reference remains powered up at all times.
Figure 15 shows the general diagram of the operation of the
AD7888 in this mode. On the first falling SCLK edge after
CS
goes low, the AD7888 comes out of standby. The AD7888
wake-up time is very short in this mode so it is possible to wake
up the part and carry out a valid conversion in the same read/
write operation. The input signal is sampled on the second
rising edge of SCLK following the
CS
falling edge. At the end
of conversion (last rising edge of SCLK) the part automatically
enters its standby mode.
相關PDF資料 |
PDF描述 |
|---|---|
| AD7889 | 12-Bit 600 kSPS ADC(單電源600kSPS12位A/D轉換器) |
| AD7890AN-10 | DIN Audio Connector; No. of Contacts:6; Contact Termination:Solder; Mounting Type:Panel; Gender:Female; Terminal Type:Solder RoHS Compliant: Yes |
| AD7890AR-4 | Circular Connector Cable Assembly; Connector Type A:Circular Receptacle; Connector Type B:Stripped End Leads; Cable Length:10ft RoHS Compliant: Yes |
| AD7890BN-10 | SECURITY GUARD BLACK LOCKDOWN |
| AD7890BN-2 | Slide Switch; Circuitry:SPDT; Contact Current Max:4A; Switch Operation:On-On; Switch Terminals:Through Hole; Actuator Style:Vertical Flush; Leaded Process Compatible:Yes; Mounting Type:PCB; Switch Features:Vertical Flush Actuator RoHS Compliant: Yes |
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| AD7888BRZ | 功能描述:IC ADC 12BIT SRL 125KSPS 16SOIC RoHS:是 類別:集成電路 (IC) >> 數據采集 - 模數轉換器 系列:- 標準包裝:1,000 系列:- 位數:12 采樣率（每秒）:300k 數據接口:并聯 轉換器數目:1 功率耗散（最大）:75mW 電壓電源:單電源 工作溫度:0°C ~ 70°C 安裝類型:表面貼裝 封裝/外殼:24-SOIC（0.295"，7.50mm 寬） 供應商設備封裝:24-SOIC 包裝:帶卷 (TR) 輸入數目和類型:1 個單端，單極；1 個單端，雙極 |
| AD7889-1ACBZ-500R7 | 功能描述:IC ADC 12BIT CTRLR TOUCH 12WLCSP RoHS:是 類別:集成電路 (IC) >> 數據采集 - 觸摸屏控制器 系列:- 標準包裝:96 系列:- 類型:- 觸摸面板接口:- 輸入數/鍵:- 分辨率（位）:- 評估套件:* 數據接口:- 數據速率/采樣率 (SPS，BPS):- 電壓基準:- 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） 供應商設備封裝:16-TSSOP 包裝:帶卷 (TR) |
| AD7889-1ACBZ-RL | 功能描述:IC ADC 12BIT CTRLR TOUCH 12WLCSP RoHS:是 類別:集成電路 (IC) >> 數據采集 - 觸摸屏控制器 系列:- 標準包裝:96 系列:- 類型:- 觸摸面板接口:- 輸入數/鍵:- 分辨率（位）:- 評估套件:* 數據接口:- 數據速率/采樣率 (SPS，BPS):- 電壓基準:- 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） 供應商設備封裝:16-TSSOP 包裝:帶卷 (TR) |
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| AD7889ACBZ-500R7 | 功能描述:IC ADC 12BIT CTRLR TOUCH 12WLCSP RoHS:是 類別:集成電路 (IC) >> 數據采集 - 觸摸屏控制器 系列:- 標準包裝:96 系列:- 類型:- 觸摸面板接口:- 輸入數/鍵:- 分辨率（位）:- 評估套件:* 數據接口:- 數據速率/采樣率 (SPS，BPS):- 電壓基準:- 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） 供應商設備封裝:16-TSSOP 包裝:帶卷 (TR) |
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