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參數資料
| 型號： | AD7843 |
| 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： | 5/16頁 |
| 文件大小： | 193K |
| 代理商： | AD7843 |
REV. 0
AD7843
–5–
PIN FUNCTION DESCRIPTIONS
Pin
No.
Mnemonic
Function
1, 10
+V
CC
Power Supply Input. The +V
CC
range for the AD7843 is from 2.2 V to 5.25 V. Both +V
CC
pins should
be connected directly together.
X+ Position Input. ADC Input Channel 1.
Y+ Position Input. ADC Input Channel 2.
X– Position Input.
Y– Position Input.
Analog Ground. Ground reference point for all circuitry on the AD7843. All analog input signals and
any external reference signal should be referred to this GND voltage.
Auxiliary Input 1. ADC Input Channel 3.
Auxiliary Input 2. ADC Input Channel 4.
Reference Input for the AD7843. An external reference must be applied to this input. The voltage
range for the external reference is 1.0 V to +V
CC
. For specified performance it is 2.5 V.
Pen Interrupt. CMOS Logic open drain output (requires 10 k
to 100 k
pull-up resistor externally).
Data Out. Logic Output. The conversion result from the AD7843 is provided on this output as a
serial data stream. The bits are clocked out on the falling edge of the DCLK input. This output is
high impedance when
CS
is high.
BUSY Output. Logic Output. This output is high impedance when
CS
is high.
Data In. Logic Input. Data to be written to the AD7843’s Control Register is provided on this input
and is clocked into the register on the rising edge of DCLK (see Control Register section).
Chip Select Input. Active Low Logic Input. This input provides the dual function of initiating con-
versions on the AD7843 and also enables the serial input/output register.
External Clock Input. Logic Input. DCLK provides the serial clock for accessing data from the part.
This clock input is also used as the clock source for the AD7843’s conversion process.
2
3
4
5
6
X+
Y+
X–
Y–
GND
7
8
9
IN3
IN4
V
REF
11
12
PENIRQ
DOUT
13
14
BUSY
DIN
15
CS
16
DCLK
TERMINOLOGY
Integral Nonlinearity
This is the maximum deviation from a straight line passing
through the endpoints of the ADC transfer function. The end-
points of the transfer function are zero scale, a point 1 LSB
below the first code transition, and full scale, a point 1 LSB
above the last code transition.
Differential Nonlinearity
This is the difference between the measured and the ideal 1 LSB
change between any two adjacent codes in the ADC.
Offset Error
This is the deviation of the first code transition (00 . . . 000) to
(00 . . . 001) from the ideal, i.e., AGND + 1 LSB.
Gain Error
This is the deviation of the last code transition (111 . . . 110) to
(111 . . . 111) from the ideal (i.e., V
REF
– 1 LSB) after the offset
error has been adjusted out.
Track/Hold Acquisition Time
The track/hold amplifier enters the acquisition phase on the fifth
falling edge of DCLK after the START bit has been detected.
Three DCLK cycles are allowed for the Track/Hold acquisition
time and the input signal will be fully acquired to the 12-bit
level within this time even with the maximum specified DCLK
frequency. See Analog Input section for more details.
On-Resistance
This is a measure of the ohmic resistance between the drain and
source of the switch drivers.
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| AD7843ARQ | Touch Screen Digitizer |
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| AD7843ARQ-REEL | Touch Screen Digitizer |
| AD7843ARQ-REEL7 | Touch Screen Digitizer |
相關代理商/技術參數 |
參數描述 |
|---|---|
| AD7843ARQ | 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 TOUCH SCREN DIGITIZER I.C. - Bulk 制造商:Analog Devices 功能描述:IC 12-BIT ADC |
| AD7843ARQ-REEL | 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 TOUCH SCREN DIGITIZER I.C. - Tape and Reel |
| AD7843ARQ-REEL7 | 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 TOUCH SCREN DIGITIZER I.C. - Tape and Reel |
| AD7843ARQZ | 功能描述:IC ADC 12BIT TOUCHSCREEN 16-QSOP 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) |
| AD7843ARQZ2 | 制造商:AD 制造商全稱:Analog Devices 功能描述:Touch Screen Digitizer |
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