MSP430F2619S-HT Datasheet, PDF (61/90 Pages) Texas Instruments – MIXED SIGNAL MICROCONTROLLER

MSP430F2619S-HT
www.ti.com
SLAS697B – MARCH 2010 – REVISED JUNE 2011
12-Bit ADC Built-In Reference – Electrical Characteristics
over recommended ranges of supply voltage and operating free-air temperature (unless otherwise noted)
PARAMETER
V_REF+
Positive built-in
reference voltage
output
TEST CONDITIONS
REF2_5V = 1 (2.5 V)
I_VREF+max ≤ I_VREF+ ≤ I_VREF+min
REF2_5V = 1 (1.5 V)
I_VREF+max ≤ I_VREF+ ≤ I_VREF+min
T_A
-55°C to 85°C
150°C
-55°C to 85°C
150°C
V_CC
3V
2.2 V/3 V
MIN TYP MAX UNIT
2.4 2.5 2.6
2.37 2.5 2.64
V
1.44 1.5 1.56
1.42 1.5 1.57
AV_CC(min)
I_VREF+
AV_CC minimum
voltage, positive
built-in reference
active
Load current out of
V_REF+ terminal
REF2_5V = 0,
I_VREF+max ≤ I_VREF+ ≤ I_VREF+min
REF2_5V = 1,
–0.5 mA ≤ I_VREF+ ≤ I_VREF+min
REF2_5V = 1,
–1 mA ≤ I_VREF+ ≤ I_VREF+min
2.2
2.8
2.9
2.2 V 0.01
3V
0.01
V
–0.5
mA
–1
I_L(VREF)+ ⁽¹⁾
Load current
regulation, V_REF+
terminal
I_VREF+ = 500 μA ± 100 μA,
Analog input voltage V_Ax ≉ 0.75 V,
REF2_5V = 0
I_VREF+ = 500 μA ± 100 μA,
Analog input voltage V_Ax ≉ 1.25 V,
REF2_5V = 1
2.2 V
3V
3V
±2
±2
LSB
±2
Load current
I_DL(VREF)+ ⁽²⁾ regulation, V_REF+
terminal
I_VREF+ = 100 μA → 900 μA,
C_VREF+ = 5 μF, at ≉ 0.5 V_REF+,
Error of conversion result ≤ 1 LSB
3V
20 ns
C_VREF+
T_REF+ ⁽¹⁾
Capacitance
at pin V_REF+ ⁽³⁾
Temperature
coefficient of built-in
reference
REFON = 1,
0 mA ≤ I_VREF+ ≤ I_VREF+max
I_VREF+ is a constant in the range of
0 mA ≤ I_VREF+ ≤ 1 mA
2.2 V/3 V
2.2 V/3 V
5 10
µF
±100
ppm/°
C
t_REFON ⁽¹⁾
Settling time of
internal reference
voltage ⁽⁴⁾
(See Figure 39)
I_VREF+ = 0.5 mA, C_VREF+ = 10 μF,
V_REF+ = 1.5 V, V_AVCC = 2.2 V
17 ms
(1) Limits characterized
(2) Limits verified by design
(3) The internal buffer operational amplifier and the accuracy specifications require an external capacitor. All INL and DNL tests use two
capacitors between pins V_REF+ and AV_SS and V_REF-/V_eREF- and AV_SS: 10 μF tantalum and 100 nF ceramic.
(4) The condition is that the error in a conversion started after t_REFON or t_RefBuf is less than ±0.5 LSB.
Typical Characteristics – ADC12
C_VREF+
100 mF
10 mF
t_REFON » .6 6 x C_VREF+ [m s ] w ith CVREF+ in mF
1 mF
0
1 ms
10 ms
100 ms
t_REFON
Figure 39. Typical Settling Time of Internal Reference t_REFON vs External Capacitor on V_REF+
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