AD7843 查看數據表（PDF） - Analog Devices

零件编号

产品描述 (功能)

比赛名单

AD7843

Touch Screen Digitizer

Analog Devices 

AD7843

SPECIFICATIONS

VCC = 2.7 V to 3.6 V, VREF = 2.5 V, fSCLK = 2 MHz, TA = −40°C to +85°C, unless otherwise noted.

Table 1.

Parameter

DC ACCURACY

Resolution

No Missing Codes

Integral Nonlinearity2

Offset Error2

Offset Error Match3

Gain Error2

Gain Error Match3

Power Supply Rejection

SWITCH DRIVERS

On-Resistance2

Y+, X+

Y−, X−

ANALOG INPUT

Input Voltage Ranges

DC Leakage Current

Input Capacitance

REFERENCE INPUT

VREF Input Voltage Range

DC Leakage Current

VREF Input Impedance

VREF Input Current3

LOGIC INPUTS

Input High Voltage, VINH

Input Low Voltage, VINL

Input Current, IIN

Input Capacitance, CIN4

LOGIC OUTPUTS

Output High Voltage, VOH

Output Low Voltage, VOL

PENIRQ Output Low Voltage, VOL

Floating-State Leakage Current

Floating-State Output Capacitance4

Output Coding

CONVERSION RATE

Conversion Time

Track-and-Hold Acquisition Time

Throughput Rate

Footnotes on next page.

AD7843A1

12

11

±2

±6

1

0.1

±4

1

0.1

70

5

6

0 to VREF

±0.1

37

1.0/+VCC

±1

5

20

1

1

2.4

0.4

±1

10

VCC − 0.2

0.4

0.4

±10

10

Straight (Natural) Binary

12

3

125

Unit

Bits

Bits min

LSB max

LSB max

LSB max

LSB typ

LSB max

LSB max

LSB typ

dB typ

Test Conditions/Comments

VCC = 2.7 V

Ω typ

Ω typ

V

µA typ

pF typ

V min/max

µA max

GΩ typ

µA max

µA typ

µA max

V min

V max

µA max

pF max

V min

V max

V max

µA max

pF max

CS = GND or +VCC

8 µA typ

fSAMPLE = 12.5 kHz

CS = +VCC; 0.001 µA typ

Typically 10 nA, VIN = 0 V or +VCC

ISOURCE = 250 µA; VCC = 2.2 V to 5.25 V

ISINK = 250 µA

ISINK = 250 µA; 100 kW pull-up

DCLK Cycles max

DCLK Cycles min

kSPS max

Rev. B | Page 3 of 20

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