ADS7846NG4 Datasheet, PDF (3/30 Pages) Burr-Brown (TI) – TOUCH SCREEN CONTROLLER

ELECTRICAL CHARACTERISTICS
At T_A = –40°C to +85°C, +V_CC = +2.7V, V_REF = 2.5V internal voltage, f_SAMPLE = 125kHz, f_CLK = 16 • f_SAMPLE = 2MHz, 12-bit mode, and digital inputs = GND or +V_CC,
unless otherwise noted.
ADS7846E
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
ANALOG INPUT
Full-Scale Input Span
Absolute Input Range
Capacitance
Leakage Current
Positive Input-Negative Input
0
Positive Input
–0.2
Negative Input
–0.2
V_REF
V
+V_CC + 0.2
V
+0.2
V
25
pF
0.1
µA
SYSTEM PERFORMANCE
Resolution
No Missing Codes
Integral Linearity Error
Offset Error
Gain Error
Noise
Power-Supply Rejection
External V_REF
Including Internal V_REF
12
11
70
70
Bits
Bits
±2
LSB⁽¹⁾
±6
LSB
±4
LSB
µVrms
dB
SAMPLING DYNAMICS
Conversion Time
Acquisition Time
Throughput Rate
Multiplexer Settling Time
Aperture Delay
Aperture Jitter
Channel-to-Channel Isolation
SWITCH DRIVERS
On-Resistance
Y+, X+
Y–, X–
Drive Current⁽²⁾
V_IN = 2.5Vp-p at 50kHz
Duration 100ms
12
CLK Cycles
3
CLK Cycles
125
kHz
500
ns
30
ns
100
ps
100
dB
5
Ω
6
Ω
50
mA
REFERENCE OUTPUT
Internal Reference Voltage
Internal Reference Drift
Quiescent Current
2.45
2.50
15
500
2.55
V
ppm/°C
µA
REFERENCE INPUT
Range
Input Impedance
1.0
SER/DFR = 0, PD1 = 0,
+V_CC
V
1
GΩ
Internal Reference Off
Internal Reference On
250
Ω
BATTERY MONITOR
Input Voltage Range
Input Impedance
Sampling Battery
Battery Monitor Off
Accuracy
External V_REF = 2.5V
Internal Reference
0.5
6.0
V
10
kΩ
1
GΩ
–2
+2
%
–3
+3
%
TEMPERATURE MEASUREMENT
Temperature Range
Resolution
Accuracy
DIGITAL INPUT/OUTPUT
Logic Family
Logic Levels, Except PENIRQ
V_IH
V_IL
V_OH
V_OL
PENIRQ
V_OL
Data Format
Differential Method⁽³⁾
TEMP0⁽⁴⁾
Differential Method⁽³⁾
TEMP0⁽⁴⁾
–40
+85
°C
1.6
°C
0.3
°C
±2
°C
±3
°C
CMOS
| I_IH | ≤ +5µA
| I_IL | ≤ +5µA
I_OH = –250µA
I_OL = 250µA
+V_CC • 0.7
–0.3
+V_CC • 0.8
+V_CC + 0.3
+0.8
V
V
0.4
V
T_A = 0°C to +85°C, 50kΩ Pull-Up
0.8
V
Straight Binary
POWER-SUPPLY REQUIREMENTS
+V_CC(5)
Quiescent Current
Power Dissipation
TEMPERATURE RANGE
Specified Performance
Specified Performance
2.7
3.6
V
Operating Range
2.2
5.25
V
Internal Reference Off
280
650
µA
Internal Reference On
780
µA
f_SAMPLE = 12.5kHz
Power-Down Mode with
220
µA
3
µA
CS = DCLK = DIN = +V_CC
+V_CC = +2.7V
1.8
mW
–40
+85
°C
NOTES: (1) LSB means least significant bit. With V_REF equal to +2.5V, one LSB is 610µV. (2) Ensured by design, but not tested. Exceeding 50mA source current
may result in device degradation. (3) Difference between TEMP0 and TEMP1 measurement. No calibration necessary. (4) Temperature drift is –2.1mV/°C.
(5) ADS7846 operates down to 2.2V.
ADS7846
3
SBAS125H
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