參數(shù)資料
型號(hào)： AD7873
廠商： Analog Devices, Inc.
英文描述： Touch Screen Digitizer
中文描述： 觸摸屏數(shù)字轉(zhuǎn)換器
文件頁(yè)數(shù)： 13/28頁(yè)
文件大?。?/td> 657K
代理商： AD7873
AD7873
CIRCUIT INFORMATION
The AD7873 is a fast, low-power, 12-bit, single-supply A/D
converter. The AD7873 can be operated from a 2.2 V to 5.25 V
supply. When operated from either a 5 V supply or a 3 V supply,
the AD7873 is capable of throughput rates of 125 kSPS when
provided with a 2 MHz clock.
Rev. D | Page 13 of 28
The AD7873 provides the user with an on-chip track-and-hold,
multiplexer, A/D converter, reference, temperature sensor, and
serial interface housed in a tiny 16-lead QSOP, TSSOP, or
LFCSP package, which offers the user considerable space-saving
advantages over alternative solutions. The serial clock input
(DCLK) accesses data from the part and also provides the clock
source for the successive approximation ADC. The analog input
range is 0 V to V
REF
(where the externally applied V
REF
can be
between 1 V and +V
CC
). The AD7873 has a 2.5 V reference on
board with this reference voltage available for use externally if
buffered.
The analog input to the ADC is provided via an on-chip
multiplexer. This analog input can be any one of the X, Y, and Z
panel coordinates, battery voltage, or chip temperature. The
multiplexer is configured with low-resistance switches that
allow an unselected ADC input channel to provide power and
an accompanying pin to provide ground for an external device.
For some measurements, the on-resistance of the switches could
present a source of error. However, with a differential input to
the converter and a differential reference architecture, this error
can be negated.
ADC TRANSFER FUNCTION
The output coding of the AD7873 is straight binary. The
designed code transitions occur at successive integer LSB values
(that is, 1 LSB, 2 LSBs, and so on). The LSB size is V
REF
/4096.
The ideal transfer characteristic for the AD7873 is shown in
Figure 24.
0
A
ANALOG INPUT
1LSB
0V
+V
REF
–1LSB
1LSB = V
REF
/4096
111...111
111...110
111...000
011...111
000...010
000...001
000...000
Figure 24. Transfer Characteristic
TYPICAL CONNECTION DIAGRAM
Figure 25 shows a typical connection diagram for the AD7873
in a touch screen control application. The AD7873 features an
internal reference, but this can be overdriven with an external
low impedance source between 1 V and +V
CC
. The value of the
reference voltage sets the input range of the converter. The
conversion result is output MSB first, followed by the remaining
11 bits and three trailing zeroes, depending on the number of
clocks used per conversion. (See the Serial Interface section.)
For applications where power consumption is a concern, the
power management option should be used to improve power
performance. See Table 7 for available power management
options.
0
16
15
14
13
12
11
9
8
1
2
3
4
7
6
5
10
TOUCH
SCREEN
1
μ
F TO 10
μ
F
(OPTIONAL)
2.2V TO 5V
0.1
μ
F
0.1
μ
F
AUXILIARY
INPUT
AD7873
+V
CC
X+
Y+
X–
Y–
GND
V
BAT
AUX
DCLK
CS
DIN
BUSY
DOUT
PENIRQ
+V
CC
V
REF
SERIAL/CONVERSION CLOCK
CHIP SELECT
SERIAL DATA IN
CONVERTER STATUS
SERIAL DATA OUT
PEN INTERRUPT
50k
TO BATTERY
VOLTAGE
REGULATOR
Figure 25. Typical Application Circuit
相關(guān)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(guān)代理商/技術(shù)參數(shù)
參數(shù)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(lèi)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(lèi)型:- 觸摸面板接口:- 輸入數(shù)/鍵:- 分辨率（位）:- 評(píng)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(lèi)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)
AD7873ACPZ3 制造商:AD 制造商全稱(chēng):Analog Devices 功能描述:Touch Screen Digitizer
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