MXB7846 查看數據表（PDF） - Maxim Integrated
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MXB7846 Datasheet PDF : 24 Pages
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2.375V to 5.25V, 4-Wire Touch-Screen Controller
with Internal Reference and Temperature Sensor
Typical Operating Characteristics (continued)
(VDD = 2.7V, VREF = 2.5VEXTERNAL, fDCLK = 2MHz, fSAMPLE = 125kHz, CLOAD = 50pF, 0.1µF capacitor at REF, TA = +25°C, unless
otherwise noted.)
INTERNAL REFERENCE VOLTAGE
vs. TEMPERATURE
2.6
INTERNAL VOLTAGE REFERENCE
vs. TURN-ON TIME
2.5
INTERNAL VOLTAGE REFERENCE
vs. TURN-ON TIME
3.0
2.5
2.4
2.3
2.2
2.1
VDD = 2.7V
CL = 0.1μF
2.0
-40 -25 -10 5 20 35 50 65 80
TEMPERATURE (°C)
REFERENCE CURRENT
vs. SUPPLY VOLTAGE
8.3
CL = 0.1μF
8.2
fSAMPLE = 125kHz
EXTERNAL REFERENCE
8.1
8.0
7.9
7.8
7.7
2.5 3.0 3.5 4.0 4.5 5.0 5.5
SUPPLY VOLTAGE (V)
TEMP DIODE VOLTAGE
vs. TEMPERATURE
1.0
0.9
0.8
TEMP1
0.7
0.6
TEMP2
0.5
0.4
0.3
0.2
0.1
0
-40 -25 -10 5 20 35 50 65 80
TEMPERATURE (°C)
2.0
1.5
1.0
0.5
0
0
CL = 1μF
(1060μs) 12-BIT SETTLING
200 400 600 800 1000 1200
TURN-ON TIME (μs)
REFERENCE CURRENT vs. TEMPERATURE
8.3
8.2
8.1
8.0
7.9
VDD = 2.7V
7.8 CL = 0.1μF
fSAMPLE = 125kHz
EXTERNAL REFERENCE
7.7
-40 -25 -10 5 20 35 50 65 80
TEMPERATURE (°C)
TEMP0 DIODE VOLTAGE
vs. SUPPLY VOLTAGE
590
589
TEMP0
588
587
586
585
2.7 3.2 3.7 4.2 4.7 5.2
SUPPLY VOLTAGE (V)
2.5
2.0
1.5
1.0
0.5
0
0
NO CAPACITOR
(30μs) 12-BIT SETTLING
5 10 15 20 25 30 35 40
TURN-ON TIME (μs)
REFERENCE CURRENT vs. SAMPLE RATE
10
EXTERNAL REFERENCE
9
8
7
6
5
4
3
2
1
0
0
25
50
75
100 125
SAMPLE RATE (kHz)
TEMP1 DIODE VOLTAGE
vs. SUPPLY VOLTAGE
705
704
703
TEMP1
702
701
700
699
698
2.7 3.2 3.7 4.2 4.7 5.2
SUPPLY VOLTAGE (V)
6 _______________________________________________________________________________________
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