AD7877 Analog Devices, AD7877 Datasheet - Page 4

• 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
Parameter
DAC
LOGIC INPUTS
LOGIC OUTPUTS
CONVERSION RATE
POWER REQUIREMENTS
1
2
3
4
See the Terminology section.
Difference between Temp0 and Temp1 measurement. No calibration necessary.
Temperature drift is −2.1 mV/°C.
Sample tested @ 25°C to ensure compliance.
Resolution
Integral Nonlinearity
Differential Nonlinearity
Voltage Mode
Current Mode
Input High Voltage, V
Input Low Voltage, V
Input Current, I
Input Capacitance, C
Output High Voltage, V
Output Low Voltage, V
Floating-State Leakage Current
Floating-State Output Capacitance
Output Coding
Conversion Time
Throughput Rate
V
V
I
CC
CC
DRIVE
Output Voltage Range
Slew Rate
Output Settling Time
Capacitive Load Stability
Output Impedance
Short-Circuit Current
Output Current Range
Output Impedance
Converting Mode
Static
Shutdown Mode
(Specified Performance)
IN
INL
IN
INH
4
OL
OH
4
Min
0
0.7 V
V
2.7
1.65
DRIVE
DRIVE
− 0.2
Typ
8
±1
±1
0 − V
0 − V
−0.4, +0.5
12
50
75
21
8
125
240
650
900
150
CC
CC
/2
Rev. D | Page 4 of 44
Max
15
100
1000
Open
0.3
V
±1
10
0.4
±10
10
3.6
V
380
900
1
DRIVE
CC
Unit
Bits
Bits
V
V
V/µs
µs
pF
kΩ
mA
µA
V
V
µA
pF
V
V
µA
pF
µs
kSPS
V
V
µA
µA
µA
µA
µA
Test Conditions/Comments
Guaranteed monotonic by design
DAC register Bit 2 = 0, Bit 0 = 0
DAC register Bit 2 = 0, Bit 0 = 1
0 to 3/4 scale, R
R
Power-down mode
DAC register, Bit 2 = 1; full-scale current is set by R
Power-down mode
Typically 10 nA, V
I
I
Straight (natural) binary
CS high to DAV low
Functional from 2.2 V to 5.25 V
Digital inputs = 0 V or V
ADC on, internal reference off, V
ADC on, internal reference on, V
ADC on, internal reference on, DAC on
ADC on, but not converting, internal reference off,
V
SOURCE
SINK
LOAD
CC
= 3.6 V
= 250 µA
= 10 kΩ
= 250 µA, V
LOAD
IN
CC
= 0 V or V
/V
= 10 kΩ, C
DRIVE
CC
= 2.7 V to 5.25 V
CC
LOAD
CC
CC
= 50 pF
= 3.6 V
= 3.6 V
Data Sheet
RNG