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AD7877 Datasheet(PDF) 5 Page - Analog Devices

No. de pieza AD7877
Descripción Electrónicos  Touch Screen Controller
Download  46 Pages
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Fabricante Electrónico  AD [Analog Devices]
Página de inicio  http://www.analog.com
Logo AD - Analog Devices

AD7877 Datasheet(HTML) 5 Page - Analog Devices

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AD7877
Data Sheet
Parameter
Min
Typ
Max
Unit
Test Conditions/Comments
DAC
Resolution
8
Bits
Integral Nonlinearity
±1
Bits
Differential Nonlinearity
±1
Guaranteed monotonic by design
Voltage Mode
Output Voltage Range
0 − VCC/2
V
DAC register Bit 2 = 0, Bit 0 = 0
0 − VCC
V
DAC register Bit 2 = 0, Bit 0 = 1
Slew Rate
−0.4, +0.5
V/µs
Output Settling Time
12
15
µs
0 to 3/4 scale, RLOAD = 10 kΩ, CLOAD = 50 pF
Capacitive Load Stability
50
100
pF
RLOAD = 10 kΩ
Output Impedance
75
kΩ
Power-down mode
Short-Circuit Current
21
mA
Current Mode
Output Current Range
0
1000
µA
DAC register, Bit 2 = 1; full-scale current is set by RRNG
Output Impedance
Open
Power-down mode
LOGIC INPUTS
Input High Voltage, VINH
0.7 VDRIVE
V
Input Low Voltage, VINL
0.3
VDRIVE
V
Input Current, IIN
±1
µA
Typically 10 nA, VIN = 0 V or VCC
Input Capacitance, CIN4
10
pF
LOGIC OUTPUTS
Output High Voltage, VOH
VDRIVE − 0.2
V
ISOURCE = 250 µA, VCC/VDRIVE = 2.7 V to 5.25 V
Output Low Voltage, VOL
0.4
V
ISINK = 250 µA
Floating-State Leakage Current
±10
µA
Floating-State Output Capacitance4
10
pF
Output Coding
Straight (natural) binary
CONVERSION RATE
Conversion Time
8
µs
CS high to DAV low
Throughput Rate
125
kSPS
POWER REQUIREMENTS
VCC (Specified Performance)
2.7
3.6
V
Functional from 2.2 V to 5.25 V
VDRIVE
1.65
VCC
V
ICC
Digital inputs = 0 V or VCC
Converting Mode
240
380
µA
ADC on, internal reference off, VCC = 3.6 V
650
900
µA
ADC on, internal reference on, VCC = 3.6 V
900
µA
ADC on, internal reference on, DAC on
Static
150
µA
ADC on, but not converting, internal reference off,
VCC = 3.6 V
Shutdown Mode
1
µA
1
See the Terminology section.
2
Difference between Temp0 and Temp1 measurement. No calibration necessary.
3
Temperature drift is −2.1 mV/°C.
4
Sample tested @ 25°C to ensure compliance.
Rev. E | Page 4 of 45


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