Datasheet

ADS1217
SBAS260C
3
www.ti.com
ELECTRICAL CHARACTERISTICS: AV
DD
= 5V (Cont.)
All specifications at –40°C to +85°C, AV
DD
= +5V, DV
DD
= +2.7V to 5.25V, f
MOD
= 19.2kHz, PGA = 1, Buffer ON, R
DAC
= 150kΩ, f
DATA
= 10Hz, and V
REF
= +2.5V,
unless otherwise specified.
ADS1217
PARAMETER CONDITIONS MIN TYP MAX UNITS
VOLTAGE REFERENCE INPUT
Reference Input (V
REF
)V
REF
≡ (V
REF+
) – (V
REF–
) 0.1 2.5 2.6 V
Negative Reference Input (V
REF–
) AGND – 0.1 (V
REF+
) – 0.1 V
Positive Reference Input (V
REF+
)(V
REF–
) + 0.1 AV
DD
+ 0.1 V
Common-Mode Rejection at DC 120 dB
Common-Mode Rejection f
VREFCM
= 60Hz, f
DATA
= 60Hz 120 dB
Bias Current
(3)
V
REF
= 2.5V, PGA = 1 1.3 µA
ON-CHIP VOLTAGE REFERENCE
Output Voltage REF HI = 1 2.4 2.5 2.6 V
REF HI = 0 1.25 V
Short-Circuit Current Source 8mA
Short-Circuit Current Sink 50 µA
Drift 15 ppm/°C
Noise V
RCAP
= 0.1µF, BW = 0.1Hz to 100Hz 10 µVrms
Output Impedance Sourcing 100µA3Ω
Startup Time 5ms
IDAC
Full-Scale Output Current R
DAC
= 150kΩ, Range = 1 0.5 mA
R
DAC
= 150kΩ, Range = 2 1 mA
R
DAC
= 150kΩ, Range = 3 2 mA
R
DAC
= 15kΩ, Range = 3 20 mA
Current Setting Resistance (R
DAC
)10kΩ
Monotonicity R
DAC
= 150kΩ 8 Bits
Compliance Voltage 0AV
DD
– 1V
Output Impedance See Typical Characteristics
PSRR V
OUT
= AV
DD
/2, Code > 16 400 ppm/V
Gain Error Individual IDAC 5 %
Gain Error Drift Individual IDAC 75 ppm/°C
Gain Error Mismatch
Between IDACs, Same Range and Code 0.25 %
Gain Error Mismatch Drift
Between IDACs, Same Range and Code 15 ppm/°C
POWER-SUPPLY REQUIREMENTS
Power-Supply Voltage AV
DD
4.75 5.25 V
Analog Current (I
ADC
+ I
VREF
+ I
IDAC)
PDWN = 0, or SLEEP 1 nA
A/D Converter Current (I
ADC
) PGA = 1, Buffer OFF 175 275 µA
PGA = 128, Buffer OFF 500 750 µA
PGA = 1, Buffer ON 250 350 µA
PGA = 128, Buffer ON 900 1375 µA
V
REF
Current (I
VREF
) 250 375 µA
I
IDAC
Current (I
IDAC
) Excludes Load Current 480 675 µA
Digital Current Normal Mode, DV
DD
= 5V 180 275 µA
SLEEP Mode, DV
DD
= 5V 150 µA
Read Data Continuous Mode, DV
DD
= 5V 230 µA
PDWN = 0 1 nA
Power Dissipation PGA = 1, Buffer OFF, REFEN = 0, 1.8 2.8 mW
IDACs OFF, DV
DD
= 5V
NOTES: (1) FSR is Full-Scale Range. (2) ∆V
OUT
is change in digital result. (3) 12pF switched capacitor at f
SAMP
clock frequency.