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| ADS1218_14 Datasheet, PDF (4/45 Pages) Texas Instruments – 8-Channel, 24-Bit ANALOG-TO-DIGITAL CONVERTER with FLASH Memory | |||
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ADS1218
SBAS187C â SEPTEMBER 2001 â REVISED SEPTEMBER 2005
www.ti.com
ELECTRICAL CHARACTERISTICS: AVDD = 5V (continued)
All specifications TMIN to TMAX, AVDD = +5V, DVDD = +2.7V to 5.25V, fMOD = 19.2kHz, fOSC = 2.4576MHz, PGA = 1, Buffer On,
RDAC = 150kâ¦, VREF â¡ (REF IN+) â (REF INâ) = +2.5V, and fDATA = 10Hz, unless otherwise specified.
ADS1218
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNIT
ON-CHIP VOLTAGE REFERENCE
Output Voltage
REF HI = 1 at +25°C
2.495
2.50
2.505
V
REF HI = 0
1.25
V
Short-Circuit Current Source
8
mA
Short-Circuit Current Sink
50
µA
Short-Circuit Duration
Sink or Source
Indefinite
Drift
5
ppm/°C
Noise
Output Impedance
BW = 0.1Hz to 100Hz
Sourcing 100µA
10
µVPP
3
â¦
Startup Time
50
µs
IDAC
Full-Scale Output Current
Maximum Short-Circuit Current Duration
Monotonicity
Compliance Voltage
Output Impedance
RDAC = 150kâ¦, Range = 1
RDAC = 150kâ¦, Range = 2
RDAC = 150kâ¦, Range = 3
RDAC = 15kâ¦, Range = 3
RDAC = 10kâ¦
RDAC = 0â¦
RDAC = 150kâ¦
0.5
1
2
20
Indefinite
10
8
0
AVDD â 1
See Typical Characteristics
mA
mA
mA
mA
Minutes
Bits
V
PSRR
Absolute Error
VOUT = AVDD/2
Individual IDAC
400
ppm/V
5
%
Absolute Drift
Individual IDAC
75
ppm/°C
Mismatch Error
Between IDACs, Same Range and Code
0.25
%
Mismatch Drift
Between IDACs, Same Range and Code
15
ppm/°C
POWER-SUPPLY REQUIREMENTS
Power-Supply Voltage
Analog Current (IADC + IVREF + IDAC)
ADC Current (IADC)
AVDD
PDWN = 0, or SLEEP
PGA = 1, Buffer Off
PGA = 128, Buffer Off
4.75
5.25
V
1
nA
175
275
µA
500
750
µA
PGA = 1, Buffer On
250
350
µA
PGA = 128, Buffer On
900
1375
µA
VREF Current (IVREF)
IDAC Current (IDAC)
Digital Current
Excludes Load Current
Normal Mode, DVDD = 5V
SLEEP Mode, DVDD = 5V
Read Data Continuous Mode, DVDD = 5V
PDWN = Low
250
375
µA
480
675
µA
180
275
µA
150
µA
230
µA
1
nA
Power Dissipation
TEMPERATURE RANGE
PGA = 1, Buffer Off, REFEN = 0,
IDACS Off, DVDD = 5V
1.8
2.8
mW
Operating
â40
+85
°C
Storage
â60
+100
°C
4
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