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SLAS590M – MARCH 2009 – REVISED NOVEMBER 2015
5.40 REF, External Reference
over recommended ranges of supply voltage and operating free-air temperature (unless otherwise noted)
(1)
PARAMETER
TEST CONDITIONS
V
CC
MIN
TYP
MAX
UNIT
Positive external reference
V
eREF+
V
eREF+
> V
REF–
and V
eREF–
(2)
1.4
AV
CC
V
voltage input
Negative external reference
V
REF–
, V
eREF–
V
eREF+
> V
REF–
and V
eREF–
(3)
0
1.2
V
voltage input
(V
eREF+
–
Differential external reference
V
eREF+
> V
REF–
and V
eREF–
(4)
1.4
AV
CC
V
V
REF-
or V
eREF-
)
voltage input
1.4 V
≤
V
eREF+
≤
V
AVCC
,
V
eREF–
= 0 V, f
ADC12CLK
= 5 MHz,
2.2 V, 3 V
–26
26
µA
ADC12SHTx = 1h,
Conversion rate 200 ksps
I
VeREF+,
I
VREF-,
Static input current
VeREF-
1.4 V
≤
V
eREF+
≤
V
AVCC
,
V
eREF–
= 0 V, f
ADC12CLK
= 5 MHz,
2.2 V, 3 V
–1
1
µA
ADC12SHTx = 8h,
Conversion rate 20 ksps
Capacitance at V
VREF+
, V
VREF-
C
VREF+
, C
VREF-
(5)
10
µF
terminal
(1)
The external reference is used during ADC conversion to charge and discharge the capacitance array. The input capacitance (C
i
) is also
the dynamic load for an external reference during conversion. The dynamic impedance of the reference supply should follow the
recommendations on analog-source impedance to allow the charge to settle for 12-bit accuracy.
(2)
The accuracy limits the minimum positive external reference voltage. Lower reference voltage levels may be applied with reduced
accuracy requirements.
(3)
The accuracy limits the maximum negative external reference voltage. Higher reference voltage levels may be applied with reduced
accuracy requirements.
(4)
The accuracy limits minimum external differential reference voltage. Lower differential reference voltage levels may be applied with
reduced accuracy requirements.
(5)
Two decoupling capacitors, 10 µF and 100 nF, should be connected to VREF to decouple the dynamic current required for an external
reference source if it is used for the ADC12_A. See also the
MSP430x5xx and MSP430x6xx Family User's Guide
(
SLAU208
).
5.41 REF, Built-In Reference
over recommended ranges of supply voltage and operating free-air temperature (unless otherwise noted)
(1)
PARAMETER
TEST CONDITIONS
V
CC
MIN
TYP
MAX
UNIT
REFVSEL = {2} for 2.5 V,
3 V
2.4625
2.50 2.5375
REFON = REFOUT = 1, I
VREF+
= 0 A
Positive built-in reference
REFVSEL = {1} for 2.0 V,
V
REF+
3 V
1.9503
1.98 2.0097
V
voltage output
REFON = REFOUT = 1, I
VREF+
= 0 A
REFVSEL = {0} for 1.5 V,
2.2 V, 3 V
1.4677
1.49 1.5124
REFON = REFOUT = 1, I
VREF+
= 0 A
REFVSEL = {0} for 1.5 V
2.2
AVCC minimum voltage,
AV
CC(min)
Positive built-in reference
REFVSEL = {1} for 2.0 V
2.3
V
active
REFVSEL = {2} for 2.5 V
2.8
ADC12SR = 1
(4)
, REFON = 1, REFOUT = 0,
3 V
70
100
µA
REFBURST = 0
ADC12SR = 1
(4)
, REFON = 1, REFOUT = 1,
3 V
0.45
0.75
mA
REFBURST = 0
Operating supply current into
I
REF+
AVCC terminal
(2) (3)
ADC12SR = 0
(4)
, REFON = 1, REFOUT = 0,
3 V
210
310
µA
REFBURST = 0
ADC12SR = 0
(4)
, REFON = 1, REFOUT = 1,
3 V
0.95
1.7
mA
REFBURST = 0
(1)
The reference is supplied to the ADC by the REF module and is buffered locally inside the ADC. The ADC uses two internal buffers, one
smaller and one larger for driving the VREF+ terminal. When REFOUT = 1, the reference is available at the VREF+ terminal, as well as,
used as the reference for the conversion and uses the larger buffer. When REFOUT = 0, the reference is only used as the reference for
the conversion and uses the smaller buffer.
(2)
The internal reference current is supplied by terminal AVCC. Consumption is independent of the ADC12ON control bit, unless a
conversion is active. REFOUT = 0 represents the current contribution of the smaller buffer. REFOUT = 1 represents the current
contribution of the larger buffer without external load.
(3)
The temperature sensor is provided by the REF module. Its current is supplied via terminal AVCC and is equivalent to I
REF+
with
REFON =1 and REFOUT = 0.
(4)
For devices without the ADC12, the parametrics with ADC12SR = 0 are applicable.
Copyright © 2009–2015, Texas Instruments Incorporated
Specifications
43
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