MSP430F673x
MSP430F672x
SLAS731A –DECEMBER 2011–REVISED APRIL 2012
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REF, Built-In Reference
over recommended ranges of supply voltage and operating free-air temperature (unless otherwise noted)
PARAMETER
TEST CONDITIONS
REFVSEL = {2} for 2.5 V, REFON = 1
REFVSEL = {1} for 2.0 V, REFON = 1
REFVSEL = {0} for 1.5 V, REFON = 1
REFVSEL = {0} for 1.5 V
VCC
3 V
MIN
2.47
1.95
1.46
1.8
TYP
2.51
1.99
1.50
MAX UNIT
2.55
Positive built-in reference
voltage
VREF+
3 V
2.03
1.54
V
V
2.2 V, 3 V
AVCC minimum voltage,
Positive built-in reference
active
AVCC(min)
REFVSEL = {1} for 2.0 V
2.2
REFVSEL = {2} for 2.5 V
2.7
fADC10CLK = 5 MHz,
REFON = 1, REFBURST = 0,
REFVSEL = {2} for 2.5 V
3 V
3 V
3 V
23
21
30
27
µA
µA
µA
fADC10CLK = 5 MHz,
REFON = 1, REFBURST = 0,
REFVSEL = {1} for 2.0 V
Operating supply current
into AVCC terminal(1)
IREF+
fADC10CLK = 5 MHz,
REFON = 1, REFBURST = 0,
REFVSEL = {0} for 1.5 V
19
10
25
50
Temperature coefficient of
built-in reference(2)
ppm/
°C
TCREF+
ISENSOR
REFVSEL = {0, 1, 2}, REFON = 1
2.2 V
3 V
145
170
780
780
1.1
220
245
REFON = 1, ADC10ON = 1,
INCH = 0Ah, TA = 30°C
Operating supply current
into AVCC terminal
µA
mV
V
2.2 V
3 V
REFON = 1, ADC10ON = 1,
INCH = 0Ah, TA = 30°C
(3)
VSENSOR
See
2.2 V
3 V
1.08
1.48
1.12
1.52
ADC10ON = 1, INCH = 0Bh,
VMID is ~0.5 × VAVCC
VMID
tSENSOR(sample)
tVMID(sample)
AVCC divider at channel 11
1.5
REFON = 1, ADC10ON = 1, INCH = 0Ah,
Error of conversion result ≤ 1 LSB
Sample time required if
channel 10 is selected(4)
30
1
µs
µs
ADC10ON = 1, INCH = 0Bh,
Error of conversion result ≤ 1 LSB
Sample time required if
channel 11 is selected(5)
AVCC = AVCC (min) - AVCC(max)
TA = 25 °C
REFVSEL = {0, 1, 2}, REFON = 1
Power supply rejection ratio
(dc)
PSRR_DC
PSRR_AC
120
300 µV/V
AVCC = AVCC (min) - AVCC(max)
TA = 25 °C
f = 1 kHz, ΔVpp = 100 mV
REFVSEL = {0, 1, 2}, REFON = 1
Power supply rejection ratio
(ac)
1
mV/V
µs
AVCC = AVCC (min) - AVCC(max)
REFVSEL = {0, 1, 2}, REFON = 0 → 1
Settling time of reference
voltage(6)
tSETTLE
VSD24REF
tON
75
SD24_B internal reference
voltage
SD24REFS = 1
3 V
3 V
1.137 1.151 1.165
200
V
SD24_B internal reference
turn-on time(7)
SD24REFS = 0->1, CREF = 100 nF
µs
(1) The internal reference current is supplied via terminal AVCC. 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 tSENSOR(on)
(5) The on-time tVMID(on) is included in the sampling time tVMID(sample); no additional on time is needed.
(6) The condition is that the error in a conversion started after tREFON is ≤ 1 LSB.
.
(7) The condition is that SD24_B conversion started after tON should guarantee specified SINAD values for the selected Gain, OSR and
fSD24
.
80
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