ELECTRICAL CHARACTERISTICS: AVDD = 5V (Cont.)
All specifications TMIN to TMAX, AVDD = +5V, DVDD = +2.7V to 5.25V, fMOD = 19.2kHz, fOSC = 2.4576MHz, PGA = 1, Buffer ON, RDAC = 150kΩ, fDATA =10Hz,
VREF ≡ (REF IN+) – (REF IN–) = +2.5V, unless otherwise specified.
ADS1218
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
VOLTAGE REFERENCE INPUT
Reference Input Range
VREF
Common-Mode Rejection
Common-Mode Rejection
Bias Current(3)
REF IN+, REF IN–
VREF ≡ (REF IN+) – (REF IN–)
at DC
fVREFCM = 60Hz, fDATA = 60Hz
VREF = 2.5V
0
0.1
AVDD
2.6
V
V
dB
dB
µA
2.5
120
120
1.3
ON-CHIP VOLTAGE REFERENCE
Output Voltage
REF HI = 1 at 25°C
2.495
2.50
1.25
2.505
V
V
REF HI = 0
Short-Circuit Current Source
Short-Circuit Current Sink
Short-Circuit Duration
Drift
Noise
Output Impedance
Startup Time
8
50
Indefinite
mA
µA
Sink or Source
5
10
3
ppm/°C
µVp-p
Ω
BW = 0.1Hz to 100Hz
Sourcing 100µA
50
µs
IDAC
Full-Scale Output Current
RDAC = 150kΩ, Range = 1
RDAC = 150kΩ, Range = 2
RDAC = 150kΩ, Range = 3
RDAC = 15kΩ, Range = 3
RDAC = 10kΩ
0.5
1
2
20
mA
mA
mA
mA
Maximum Short-Circuit Current Duration
Indefinite
RDAC = 0Ω
10
Minutes
Monotonicity
RDAC = 150kΩ
8
0
Bits
V
Compliance Voltage
Output Impedance
PSRR
Absolute Error
Absolute Drift
Mismatch Error
Mismatch Drift
AVDD – 1
see Typical Characteristics
VOUT = AVDD /2
Individual IDAC
Individual IDAC
400
5
75
0.25
15
ppm/V
%
ppm/°C
%
Between IDACs, Same Range and Code
Between IDACs, Same Range and Code
ppm/°C
POWER-SUPPLY REQUIREMENTS
Power-Supply Voltage
AVDD
4.75
5.25
V
Analog Current (IADC + IVREF + IDAC
ADC Current (IADC
)
PDWN = 0, or SLEEP
PGA = 1, Buffer OFF
PGA = 128, Buffer OFF
PGA = 1, Buffer ON
PGA = 128, Buffer ON
1
nA
µA
µA
µA
µA
µA
µA
)
175
500
250
900
250
480
275
750
350
1375
375
675
VREF Current (IVREF
)
IDAC Current (IDAC
)
Excludes Load Current
Digital Current
Normal Mode, DVDD = 5V
SLEEP Mode, DVDD = 5V
Read Data Continuous Mode, DVDD = 5V
PDWN= LOW
180
150
230
1
275
µA
µA
µA
nA
Power Dissipation
PGA = 1, Buffer OFF, REFEN = 0,
IDACS OFF, DVDD = 5V
1.8
2.8
mW
TEMPERATURE RANGE
Operating
Storage
–40
–60
+85
+100
°C
°C
NOTES: (1) Calibration can minimize these errors. (2) ∆ VOUT is change in digital result. (3) 12pF switched capacitor at fSAMP clock frequency.
ADS1218
3
SBAS187
BB [ BURR-BROWN CORPORATION ]
