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參數資料
| 型號： | AD7873BCP |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | 消費家電 |
| 英文描述： | Touch Screen Digitizer |
| 中文描述： | SPECIALTY CONSUMER CIRCUIT, QCC16 |
| 封裝： | 4 X 4 MM, MO-220VGGC, LFCSP-16 |
| 文件頁數： | 13/28頁 |
| 文件大?。?/td> | 657K |
| 代理商： | AD7873BCP |
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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PDF資料 |
PDF描述 |
|---|---|
| AD7873BRQ | Touch Screen Digitizer |
| AD7874 | 4-Channel, 12-Bit Simultaneous Sampling Data Acquisition System(LC2MOS 4通道,12位同時采樣DAS) |
| AD7878SQ | IC 1:10 CLOCK DRIVER 20-QSOP |
| AD7878 | LC2MOS Complete 12-Bit 100 kHz Sampling ADC with DSP Interface |
| AD7878AQ | LC2MOS Complete 12-Bit 100 kHz Sampling ADC with DSP Interface |
相關代理商/技術參數 |
參數描述 |
|---|---|
| AD7873BCP-REEL | 制造商:Analog Devices 功能描述:TOUCH SCREEN DIGITIZER |
| AD7873BCP-REEL7 | 制造商:Analog Devices 功能描述:TOUCH SCREEN DIGITIZER 制造商:Analog Devices 功能描述:2.7V 12-BIT TOUCH SCREEN DIGITIZER I.C. - Tape and Reel |
| AD7873BCPZ | 制造商:Analog Devices 功能描述:TOUCH SCREEN DIGITIZER |
| AD7873BRQ | 制造商:Analog Devices 功能描述:TOUCH SCREEN DIGITIZER |
| AD7873BRQ-REEL | 制造商:Analog Devices 功能描述:TOUCH SCREEN DIGITIZER |
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