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參數(shù)資料
| 型號(hào)： | AD7873ARUZ-REEL7 |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 7/29頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC ADC 12BIT TOUCHSCREEN 16TSSOP |
| 標(biāo)準(zhǔn)包裝： | 1,000 |
| 類型： | 電阻 |
| 觸摸面板接口： | 4 線 |
| 輸入數(shù)/鍵： | 1 TSC |
| 分辨率（位）： | 12 b |
| 評(píng)估套件： | 可供 |
| 數(shù)據(jù)接口： | 串行 |
| 數(shù)據(jù)速率/采樣率 (SPS，BPS)： | 125k |
| 電壓基準(zhǔn)： | 外部，內(nèi)部 |
| 電源電壓： | 2.2 V ~ 5.25 V |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類型： | 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) |
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AD7873
Data Sheet
Rev. F | Page 14 of 28
ANALOG INPUT
Figure 26 shows an equivalent circuit of the analog input
structure of the AD7873 that contains a block diagram of the
input multiplexer, the differential input of the ADC, and the
differential reference.
Table 6 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.
Figure 26. Equivalent Analog Input Circuit
Table 6. Analog Input, Reference, and Touch Screen Control
A2
A1
A0
SER/ DFR
Analog Input
X Switches
Y Switches
–REF1
0
1
TEMP0
Off
VREF
GND
0
1
X+
Off
On
VREF
GND
0
1
0
1
VBAT
Off
VREF
GND
0
1
X+ (Z1)
X+ Off
Y+ On
VREF
GND
X– On
Y– Off
1
0
1
Y– (Z2)
X+ Off
Y+ On
VREF
GND
X– On
Y– Off
1
0
1
Y+
On
Off
VREF
GND
1
0
1
AUX
Off
VREF
GND
1
TEMP1
Off
VREF
GND
0
Invalid Address. Test Mode: Switches out the TEMP0 diode to the PENIRQ pin.
0
1
0
X+
Off
On
Y+
Y–
0
1
0
Invalid Address
0
1
0
X+ (Z1)
X+ Off
Y+ On
Y+
X–
X– On
Y– Off
1
0
Y– (Z2)
X+ Off
Y+ On
Y+
X–
X– On
Y– Off
1
0
1
0
Y+
ON
Off
X+
X–
1
0
Outputs Identity Code, 1000 0000 0000.
1
0
Invalid address. Test mode: Switches out the TEMP1 diode to the PENIRQ pin.
1
Internal node, not directly accessible by the user.
X+ Y+
REF
INT/
EXT
X– Y– GND
6-TO-1
MUX
3-TO-1
MUX
3-TO-1
MUX
IN+
IN– REF–
REF+
ADC CORE
DATA OUT
VCC
Y–
Y+
X+
X–
ON-CHIP SWITCHES
X+
Y+
Y–
VBAT
AUX
TEMP
02164-
026
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