Datasheet

MSP430F673x
MSP430F672x
SLAS731C –DECEMBER 2011–REVISED FEBRUARY 2013 www.ti.com
REF, Built-In Reference
over recommended ranges of supply voltage and operating free-air temperature (unless otherwise noted)
PARAMETER TEST CONDITIONS V
CC
MIN TYP MAX UNIT
REFVSEL = {2} for 2.5 V, REFON = 1 3 V 2.47 2.51 2.55
Positive built-in reference
V
REF+
REFVSEL = {1} for 2.0 V, REFON = 1 3 V 1.95 1.99 2.03 V
voltage
REFVSEL = {0} for 1.5 V, REFON = 1 2.2 V, 3 V 1.46 1.50 1.54
REFVSEL = {0} for 1.5 V 1.8
AVCC minimum voltage,
AV
CC(min)
Positive built-in reference REFVSEL = {1} for 2.0 V 2.2 V
active
REFVSEL = {2} for 2.5 V 2.7
f
ADC10CLK
= 5 MHz,
REFON = 1, REFBURST = 0, 3 V 23 30 µA
REFVSEL = {2} for 2.5 V
f
ADC10CLK
= 5 MHz,
Operating supply current
I
REF+
REFON = 1, REFBURST = 0, 3 V 21 27 µA
into AVCC terminal
(1)
REFVSEL = {1} for 2.0 V
f
ADC10CLK
= 5 MHz,
REFON = 1, REFBURST = 0, 3 V 19 25 µA
REFVSEL = {0} for 1.5 V
Temperature coefficient of ppm/
TC
REF+
REFVSEL = {0, 1, 2}, REFON = 1 10 50
built-in reference
(2)
°C
2.2 V 145 220
REFON = 1, ADC10ON = 1,
Operating supply current
I
SENSOR
µA
into AVCC terminal
INCH = 0Ah, T
A
= 30°C
3 V 170 245
2.2 V 780
REFON = 1, ADC10ON = 1,
V
SENSOR
See
(3)
mV
INCH = 0Ah, T
A
= 30°C
3 V 780
2.2 V 1.08 1.1 1.12
ADC10ON = 1, INCH = 0Bh,
V
MID
AV
CC
divider at channel 11 V
V
MID
is ~0.5 × V
AVCC
3 V 1.48 1.5 1.52
REFON = 1, ADC10ON = 1, INCH = 0Ah,
Sample time required if
t
SENSOR(sample)
30 µs
channel 10 is selected
(4)
Error of conversion result ≤ 1 LSB
ADC10ON = 1, INCH = 0Bh,
Sample time required if
t
VMID(sample)
1 µs
channel 11 is selected
(5)
Error of conversion result ≤ 1 LSB
AV
CC
= AV
CC (min)
- AV
CC(max)
Power supply rejection ratio
PSRR_DC T
A
= 25 °C 120 300 µV/V
(dc)
REFVSEL = {0, 1, 2}, REFON = 1
AV
CC
= AV
CC (min)
- AV
CC(max)
T
A
= 25 °C
Power supply rejection ratio
PSRR_AC 1 mV/V
(ac)
f = 1 kHz, ΔVpp = 100 mV
REFVSEL = {0, 1, 2}, REFON = 1
AV
CC
= AV
CC (min)
- AV
CC(max)
Settling time of reference
t
SETTLE
75 µs
voltage
(6)
REFVSEL = {0, 1, 2}, REFON = 0 → 1
SD24_B internal reference
V
SD24REF
SD24REFS = 1 3 V 1.137 1.151 1.165 V
voltage
SD24_B internal reference
t
ON
SD24REFS = 0->1, C
REF
= 100 nF 3 V 200 µs
turn-on time
(7)
(1) The internal reference current is supplied via terminal AV
CC
. Consumption is independent of the ADC10ON control bit, unless a
conversion is active. The REFON bit enables to settle the built-in reference before starting an A/D conversion.
(2) Calculated using the box method: (MAX(-40 to 85°C) – MIN(-40 to 85°C)) / MIN(-40 to 85°C)/(85°C – (–40°C)).
(3) The temperature sensor offset can be as much as ±20°C. A single-point calibration is recommended to minimize the offset error of the
built-in temperature sensor.
(4) The typical equivalent impedance of the sensor is 51 kΩ. The sample time required includes the sensor-on time t
SENSOR(on)
.
(5) The on-time t
VMID(on)
is included in the sampling time t
VMID(sample)
; no additional on time is needed.
(6) The condition is that the error in a conversion started after t
REFON
is ≤ 1 LSB.
(7) The condition is that SD24_B conversion started after t
ON
should guarantee specified SINAD values for the selected Gain, OSR and
f
SD24
.
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