ELECTRICAL CHARACTERISTICS
At TA = –40°C to +85°C, +VCC = +2.7V, VREF = 2.5V internal voltage, fSAMPLE = 125kHz, fCLK = 16 • fSAMPLE = 2MHz, 12-bit mode, and digital inputs = GND or +VCC
,
unless otherwise noted.
ADS7846E
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
ANALOG INPUT
Full-Scale Input Span
Absolute Input Range
Positive Input-Negative Input
Positive Input
0
–0.2
–0.2
VREF
+VCC + 0.2
+0.2
V
V
V
Negative Input
Capacitance
Leakage Current
25
0.1
pF
µA
SYSTEM PERFORMANCE
Resolution
No Missing Codes
Integral Linearity Error
Offset Error
12
Bits
Bits
11
±2
±6
±4
LSB(1)
LSB
Gain Error
External VREF
LSB
Noise
Including Internal VREF
70
70
µVrms
dB
Power-Supply Rejection
SAMPLING DYNAMICS
Conversion Time
12
CLK Cycles
Acquisition Time
3
CLK Cycles
Throughput Rate
Multiplexer Settling Time
Aperture Delay
125
kHz
ns
ns
500
30
Aperture Jitter
Channel-to-Channel Isolation
100
100
ps
dB
VIN = 2.5Vp-p at 50kHz
Duration 100ms
SWITCH DRIVERS
On-Resistance
Y+, X+
Y–, X–
Drive Current(2)
5
6
Ω
Ω
mA
50
REFERENCE OUTPUT
Internal Reference Voltage
Internal Reference Drift
Quiescent Current
2.45
1.0
2.50
15
500
2.55
V
ppm/°C
µA
REFERENCE INPUT
Range
+VCC
V
Input Impedance
SER/DFR = 0, PD1 = 0,
Internal Reference Off
Internal Reference On
1
GΩ
250
Ω
BATTERY MONITOR
Input Voltage Range
Input Impedance
Sampling Battery
Battery Monitor Off
Accuracy
0.5
6.0
V
10
1
kΩ
GΩ
%
External VREF = 2.5V
Internal Reference
–2
–3
+2
+3
%
TEMPERATURE MEASUREMENT
Temperature Range
Resolution
–40
+85
°C
°C
°C
°C
°C
Differential Method(3)
TEMP0(4)
Differential Method(3)
TEMP0(4)
1.6
0.3
±2
Accuracy
±3
DIGITAL INPUT/OUTPUT
Logic Family
CMOS
Logic Levels, Except PENIRQ
VIH
VIL
VOH
VOL
PENIRQ
VOL
| IIH | ≤ +5µA
| IIL | ≤ +5µA
IOH = –250µA
IOL = 250µA
+VCC • 0.7
–0.3
+VCC • 0.8
+VCC + 0.3
+0.8
V
V
V
0.4
0.8
TA = 0°C to +85°C, 50kΩ Pull-Up
V
Data Format
Straight Binary
POWER-SUPPLY REQUIREMENTS
(5)
+VCC
Specified Performance
Operating Range
Internal Reference Off
Internal Reference On
fSAMPLE = 12.5kHz
Power-Down Mode with
CS = DCLK = DIN = +VCC
+VCC = +2.7V
2.7
2.2
3.6
5.25
650
V
V
µA
µA
µA
µA
Quiescent Current
280
780
220
3
Power Dissipation
1.8
mW
TEMPERATURE RANGE
Specified Performance
–40
+85
°C
NOTES: (1) LSB means least significant bit. With VREF 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
SBAS125H
3
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BB [ BURR-BROWN CORPORATION ]
