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參數資料
| 型號： | AD7873 |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | Touch Screen Digitizer |
| 中文描述： | 觸摸屏數字轉換器 |
| 文件頁數： | 14/28頁 |
| 文件大小： | 657K |
| 代理商： | AD7873 |
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AD7873
ANALOG INPUT
Figure 26 shows an equivalent circuit of the analog input
structure of the AD7873, which contains a block diagram of the
input multiplexer, the differential input of the ADC, and the
differential reference.
Rev. D | Page 14 of 28
Table 5 shows the multiplexer address corresponding to each
analog input, both for the SER/DFR bit in the control register
set high and low. The control bits are provided serially to the
device via the DIN pin. For more information on the control
register, see the Control Register section.
When the converter enters hold mode, the voltage difference
between the +IN and –IN inputs (see Figure 26) is captured on
the internal capacitor array. The input current on the analog
inputs depends on the conversion rate of the device. During the
sample period, the source must charge the internal sampling
capacitor (typically 37 pF). Once the capacitor is fully charged,
there is no further input current. The rate of charge transfer
from the analog source to the converter is a function of
conversion rate.
0
X+ Y+
REF
INT/
EXT
X– Y– GND
6-TO-1
MUX
3-TO-1
MUX
3-TO-1
MUX
IN+
IN+
IN– REF–
REF+
ADC CORE
DATA OUT
V
CC
Y–
Y+
X+
X–
ON-CHIP SWITCHES
X+
Y+
Y–
V
BAT
AUX
TEMP
Figure 26. Equivalent Analog Input Circuit
Table 5. Analog Input, Reference, and Touch Screen Control
A2
A1
A0
SER/ DFR
0
0
0
1
0
0
1
1
0
1
0
1
0
1
1
1
1
0
0
1
1
0
1
1
1
1
0
1
1
1
1
1
0
0
0
0
0
0
1
0
0
1
0
0
0
1
1
0
1
0
0
0
1
0
1
0
1
1
0
0
1
1
1
0
Analog Input
TEMP0
X+
VBAT
X+ (Z1)
Y– (Z2)
Y+
AUX
TEMP1
Invalid Address. Test Mode: Switches out the Temp0 diode to the PENIRQ pin.
X+
OFF
Invalid Address
X+ (Z1)
X+ OFF
X– ON
Y– (Z2)
X+ OFF
X– ON
Y+
ON
Outputs Identity Code, 1000 0000 0000.
Invalid address. Test mode: Switches out the Temp1 diode to the PENIRQ pin.
X Switches
OFF
OFF
OFF
X+ OFF
X– ON
X+ OFF
X– ON
ON
OFF
OFF
Y Switches
OFF
ON
OFF
Y+ ON
Y– OFF
Y+ ON
Y– OFF
OFF
OFF
OFF
+REF
1
V
REF
V
REF
V
REF
V
REF
V
REF
V
REF
V
REF
V
REF
–REF
1
GND
GND
GND
GND
GND
GND
GND
GND
ON
Y+
Y–
Y+ ON
Y– OFF
Y+ ON
Y– OFF
OFF
Y+
Y+
X+
X–
X–
X–
1
Internal node, not directly accessible by the user.
相關PDF資料 |
PDF描述 |
|---|---|
| AD7873ACP | Touch Screen Digitizer |
| AD7873ACPZ | Touch Screen Digitizer |
| AD7873ACPZ3 | 10-Bit, 60 MSPS ADC SE/Diff, Int/Ext Ref., program. i/p range w/Pwrdown, comp. to ADS822/4/5/6/8 28-SSOP |
| AD7873ARQ | 10-Bit, 60 MSPS ADC SE/Diff, Int/Ext Ref., program. i/p range w/Pwrdown, comp. to ADS822/4/5/6/8 28-SSOP |
| AD7873ARU | Touch Screen Digitizer |
相關代理商/技術參數 |
參數描述 |
|---|---|
| AD7873ACP | 制造商:Analog Devices 功能描述:TOUCH SCREEN DIGITIZER |
| AD7873ACP-REEL | 制造商:Analog Devices 功能描述:TOUCH SCREEN DIGITIZER |
| AD7873ACP-REEL7 | 制造商:Analog Devices 功能描述:TOUCH SCREEN DIGITIZER |
| AD7873ACPZ | 功能描述:IC ADC 12BIT TOUCHSCREEN 16LFCSP 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) |
| AD7873ACPZ3 | 制造商:AD 制造商全稱:Analog Devices 功能描述:Touch Screen Digitizer |
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