AD7877 Analog Devices, AD7877 Datasheet - Page 12

• 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

AD7877
1
Figure 24. DAC Output Settling Time (Zero Scale to Half Scale)
600
500
400
300
200
100
Figure 25. DAC Sink Current vs. Input Code with R
CH1
0
0
200mV CH2 100mV
25
50
DAC SINK CURRENT
NOTE: MAXIMUM DAC SINK CURRENT IS
SET ACCORDING TO THE EQUATION:
I
75
MAX
INPUT CODE (Decimal)
= V
100
CC
M2.00µs
/(R
125
V
TEMPERATURE = 25°C
RNG
DD
150
= 3V
× 6)
175
CH1
∆
@: 1.296V
200
: 144mV
RNG
780mV
225
= 1 kΩ
250
Rev. D | Page 12 of 44
–2
Figure 26. Typical Accuracy for Battery Channel (25°C)
–1
ERROR (%)
0
1
Data Sheet
2