Datasheet

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SBAS203J − MARCH 2002 − REVISED JANUARY 2008
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6
ELECTRICAL CHARACTERISTICS: AV
DD
= 3V (continued)
All specifications from T
MIN
to T
MAX
, DV
DD
= +2.7V to 5.25V, f
MOD
= 15.625kHz, PGA = 1, Buffer ON, f
DATA
= 10Hz, Bipolar, and V
REF
≡ (REF IN+) − (REF IN−) = +1.25V,
unless otherwise noted.
MSC1210Yx
PARAMETER UNITSMAXTYPMINCONDITIONS
VOLTAGE REFERENCE INPUT
Reference Input Range REF IN+, REF IN− AGND AV
DD
(2)
V
V
REF
V
REF
≡ (REF IN+) − (REF IN−) 0.1 1.25 AV
DD
V
V
REF
Common-Mode Rejection
At DC 130 dB
V
REF
Common-Mode Rejection
f
CM
= 60Hz, f
DATA
= 60Hz 120 dB
Input Current
(4)
V
REF
= 1.25V 1.5 µA
ON-CHIP VOLTAGE REFERENCE
Output Voltage VREFH = 0 at +25°C, ACLK = 1MHz 1.245 1.25 1.255 V
Power-Supply Rejection Ratio 65 dB
Short-Circuit Current Source 8 mA
Short-Circuit Current Sink 50 µA
Short-Circuit Duration Sink or Source Indefinite
Drift 5 ppm/°C
Output Impedance Sourcing 100µA 3 Ω
Startup Time from Power OFF C
REF
= 0.1µF 8 ms
Temperature Sensor Voltage T = +25°C 115 mV
Temperature Sensor Coefficient 375 µV/°C
ANALOG POWER-SUPPLY REQUIREMENTS
Analog Power-Supply Voltage AV
DD
2.7 3.6 V
Analog Current
(I
ADC
+ I
VREF
)
PDADC = 1, ALVDIS = 1, DAB = 1 < 1 nA
PGA = 1, Buffer OFF 200 µA
Analog
Power-Supply
ADC Current
PGA = 128, Buffer OFF 500 µA
Power-Supply
Current
ADC Current
(I
ADC
)
PGA = 1, Buffer ON 240 µA
Current
ADC
PGA = 128, Buffer ON 850 µA
V
REF
Supply Current
(I
VREF
)
ADC ON, , V
REF
= 1.25V 240 µA
(1)
Calibration can minimize these errors.
(2)
The self-gain calibration cannot have a REF IN+ of more than AV
DD
−1.5V with Buffer ON. To calibrate gain, turn Buffer OFF.
(3)
∆V
OUT
is change in digital result.
(4)
9pF switched capacitor at f
SAMP
clock frequency (see Figure 14).
(5)
The input impedance for PGA = 128 is the same as that for PGA = 64 (that is, 7MΩ/64).