Datasheet

INA220
www.ti.com SBOS459D –JUNE 2009–REVISED SEPTEMBER 2010
ELECTRICAL CHARACTERISTICS: V
S
= +3.3V
Boldface limits apply over the specified temperature range, T
A
= –40°C to +85°C.
At T
A
= +25°C, V
IN+
= 12V, V
SENSE
= (V
IN+
– V
IN–
) = 32mV, V
BUS
= 12V, PGA = ÷ 1, and BRNG
(1)
= 1, unless otherwise noted.
INA220A INA220B
PARAMETER TEST CONDITIONS MIN TYP MAX MIN TYP MAX UNIT
INPUT
Full-Scale Current Sense (Input) Voltage Range PGA = ÷ 1 0 ±40 0 ±40 mV
PGA = ÷ 2 0 ±80 0 ±80 mV
PGA = ÷ 4 0 ±160 0 ±160 mV
PGA = ÷ 8 0 ±320 0 ±320 mV
Bus Voltage (Input Voltage) Range
(2)
BRNG = 1 0 32 0 32 V
BRNG = 0 0 16 0 16 V
Common-Mode Rejection CMRR V
IN+
= 0V to 26V 100 120 100 120 dB
Offset Voltage, RTI
(3)
V
OS
PGA = ÷ 1 ±10 ±100 ±10 ±50
(4)
mV
PGA = ÷ 2 ±20 ±125 ±20 ±75 mV
PGA = ÷ 4 ±30 ±150 ±30 ±75 mV
PGA = ÷ 8 ±40 ±200 ±40 ±100 mV
vs Temperature 0.16 0.16 mV/°C
vs Power Supply PSRR V
S
= 3V to 5.5V 10 10 mV/V
Current Sense Gain Error ±40 ±40 m%
vs Temperature, MSOP-10 1 1 m%/°C
Input Impedance Active Mode
V
IN+
Pin 20 20 mA
V
IN–
Pin 20 20 mA
V
BUS
Pin
(5)
320 320 kΩ
Input Leakage
(6)
Power-Down Mode
V
IN+
Pin 0.1 ±0.5 0.1 ±0.5 mA
V
IN–
Pin 0.1 ±0.5 0.1 ±0.5 mA
DC ACCURACY
ADC Basic Resolution 12 12 Bits
1LSB Step Size
Shunt Voltage 10 10 mV
Bus Voltage 4 4 mV
Current Measurement Error ±0.2 ±0.5 ±0.2 ±0.3 %
over Temperature ±1 ±0.5 %
Bus Voltage Measurement Error V
BUS
= 12V ±0.2 ±0.5 ±0.2 ±0.5 %
over Temperature ±1 ±1 %
Differential Nonlinearity ±0.1 ±0.1 LSB
ADC TIMING
ADC Conversion Time 12-Bit 532 586 532 586 ms
11-Bit 276 304 276 304 ms
10-Bit 148 163 148 163 ms
9-Bit 84 93 84 93 ms
Minimum Convert Input Low Time 4 4 ms
SMBus
SMBus Timeout
(7)
28 35 28 35 ms
(1) BRNG is bit 13 of the Configuration Register.
(2) This parameter only expresses the full-scale range of the ADC scaling. In no event should more than 26V be applied to this device.
(3) Referred-to-input (RTI).
(4) Shaded cells indicate improved specifications of the INA220B.
(5) The input impedance of this pin may vary approximately ±15%.
(6) Input leakage is positive (current flowing into the pin) for the conditions shown at the top of the table. Negative leakage currents can
occur under different input conditions.
(7) SMBus timeout in the INA220 resets the interface any time SCL or SDA is low for over 28ms.
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