AD7877 Analog Devices, AD7877 Datasheet - Page 9

• Manufacturer Part Number: AD7877
• Description: Touch Screen Controller
• Manufacturer: Analog Devices

Specifications of AD7877

• Resolution (bits): 12bit
• # Chan: 9
• Sample Rate: 125kSPS
• Interface: Ser
• Analog Input Type: SE-Uni
• Ain Range: Uni (Vref),Uni 2.5V
• Adc Architecture: SAR
• Pkg Type: CSP

Data Sheet
TYPICAL PERFORMANCE CHARACTERISTICS
T
A
= 25°C, V
1000
–0.1
–0.2
–0.3
–0.4
–0.5
–0.6
800
700
600
500
900
800
700
600
500
400
0.6
0.5
0.4
0.3
0.2
0.1
0
–50
–50
2.0
Figure 8. Change in ADC Gain vs. Temperature
CC
2.3
Figure 6. Supply Current vs. Temperature
= 2.7 V, V
–30
–30
2.6
Figure 7. Supply Current vs. V
–10
2.9
–10
ADC AND REF
REF
TEMPERATURE (°C)
TEMPERATURE (°C)
3.2
= 2.5 V, f
ADC, REF, AND DAC
10
0
V
3.5
CC
ADC, REF, AND DAC
(V)
ADC AND REF
3.8
30
30
SAMPLE
4.1
= 125 kHz, f
CC
50
50
4.4
4.7
70
70
5.0
DCLK
90
90
= 16 × f
Rev. D | Page 9 of 44
SAMPLE
= 2 MHz, unless otherwise noted.
–0.1
–0.2
–0.3
–0.4
–0.5
–0.6
–0.2
–0.4
–0.6
–0.8
–1.0
200
180
160
140
120
100
0.6
0.5
0.4
0.3
0.2
0.1
1.0
0.8
0.6
0.4
0.2
80
0
0
–50
–50
0
Figure 10. Change in ADC Offset vs. Temperature
Figure 9. Full Power-Down I
500
–30
–30
1000
Figure 11. ACD INL Plot
–10
–10
1500
TEMPERATURE (°C)
TEMPERATURE (°C)
10
10
2000
CODE
DD
30
30
vs. Temperature
2500
3000
50
50
3500
70
70
AD7877
4000
90
90