AD7877ACPZ-500RL7 Просмотр технического описания (PDF) - Analog Devices

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AD7877ACPZ-500RL7

Touch Screen Controller

Analog Devices 

Data Sheet

AD7877

SPECIFICATIONS

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

Table 1.

Parameter

Min

Typ

Max

Unit

Test Conditions/Comments

DC ACCURACY

Resolution

12

Bits

No Missing Codes

11

12

Bits

Integral Nonlinearity (INL)1

±2

LSB

LSB size = 610 µV

Differential Nonlinearity (DNL)1

Minimum LSB size = 610 µV

Negative DNL

−0.99 LSB

Positive DNL

+2

LSB

Offset Error1

±5

LSB

Specified for 11bits

Gain Error1

±3

LSB

Specified for 11 bits; external reference

Noise

70

µV rms

Power Supply Rejection

70

dB

Internal Clock Frequency

2

MHz

SWITCH DRIVERS

On Resistance1

Y+, X+

14

Ω

Y−, X−

14

Ω

ANALOG INPUTS

Input Voltage Ranges

0

VREF

V

DC Leakage Current

±0.1

µA

Input Capacitance

30

pF

Accuracy

0.3

%

All channels, internal VREF

REFERENCE INPUT/OUTPUT

Internal Reference Voltage

2.44

2.55

V

Internal Reference Tempco

±50

ppm/°C

VREF Input Voltage Range

1

VCC

V

DC Leakage Current

±1

µA

VREF Input Impedance

1

GΩ

CS = GND or VCC; typically 25 Ω when the on-board

reference is enabled

TEMPERATURE MEASUREMENT

Temperature Range

−40

+85

°C

Resolution

Differential Method2

1.6

°C

Single Conversion Method3

0.3

°C

Accuracy

Differential Method2

±4

°C

0°C to 70°C

Single Conversion Method3

±2

°C

Calibrated at 25°C

BATTERY MONITOR

Input Voltage Range

0.5

5

V

@ VREF = 2.5 V

Input Impedance

14

kΩ

Sampling, 1 GΩ when the battery monitor is off

Accuracy

1

3.2

%

External/internal reference, see Figure 26

Rev. E | Page 3 of 45

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