Datasheet
AMC7812
www.ti.com
SBAS513E –JANUARY 2011–REVISED SEPTEMBER 2013
ELECTRICAL CHARACTERISTICS (continued)
At T
A
= –40°C to +105°C, AV
DD
= DV
DD
= 4.5V to 5.5V, AV
CC
= +15V, AGND = DGND = 0V, IOV
DD
= 2.7V to 5.5V, internal
2.5V reference, and the DAC output span = 0V to 5V, unless otherwise noted.
AMC7812
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
ADC REFERENCE INPUT
Reference input voltage range 1.2 AV
DD
V
Input current V
REF
= 2.5V 145 µA
INTERNAL ADC REFERENCE BUFFER
Offset T
A
= +25°C ±5 mV
INTERNAL TEMPERATURE SENSOR
Operating range –40 +125 °C
AV
DD
= 5V, T
A
= –40°C to +125°C ±1.25 ±2.5 °C
Accuracy
AV
DD
= 5V, T
A
= 0°C to +100°C ±1.5 °C
Resolution Per LSB 0.125 °C
Conversion rate External temperature sensors are disabled 15 ms
EXTERNAL TEMPERATURE SENSOR (Using 2N3906 external transistor)
Operating range Limited by external diode –40 +150 °C
AV
DD
= 5V, T
A
= 0°C to +100°C,
±1.5 °C
T
D
= –40°C to +150°C
Accuracy
(6)(7)
AV
DD
= 5V, T
A
= –40°C to +100°C,
±2 °C
T
D
= –40°C to +150°C
Resolution Per LSB 0.125 °C
With resistance cancellation
72 93 100 ms
(RC bit = '1')
Conversion rate per sensor
Without resistance cancellation
33 44 47 ms
(RC bit = '0')
DIGITAL LOGIC: GPIO
(8)(9)
and ALARM
IOV
DD
= +5V 2.1 0.3 + IOV
DD
V
V
IH
Input high voltage
IOV
DD
= +3.3V 2.1 0.3 + IOV
DD
V
IOV
DD
= +5V –0.3 0.8 V
V
IL
Input low voltage
IOV
DD
= +3.3V –0.3 0.8 V
IOV
DD
= +5V, sinking 5mA 0.4 V
V
OL
Output low voltage
IOV
DD
= +3.3V, sinking 2mA 0.4 V
High-impedance leakage 5 µA
High-impedance output capacitance 10 pF
(6) T
D
is the external diode temperature.
(7) Auto conversion mode disabled
(8) For pins GPIO0-3, the external pull up resistor must be connected to a voltage less than or equal to 5.5V.
(9) For pins GPIO4-7, the external pull up resistor must be connected to a voltage less than or equal to AV
DD
.
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