MSP430F643 Datasheet, PDF (68/106 Pages) Texas Instruments – MIXED SIGNAL MICROCONTROLLER

MSP430F643x
SLAS720B – AUGUST 2010 – REVISED AUGUST 2012
www.ti.com
REF, Built-In Reference (continued)
over recommended ranges of supply voltage and operating free-air temperature (unless otherwise noted)⁽¹⁾
t_SETTLE
PARAMETER
TEST CONDITIONS
Settling time of reference
voltage ⁽⁸⁾
AV_CC = AV_CC(min) - AV_CC(max),
REFVSEL = {0, 1, 2}, REFOUT = 0,
REFON = 0 → 1
AV_CC = AV_CC(min) - AV_CC(max),
C_VREF = C_VREF(max),
REFVSEL = {0, 1, 2}, REFOUT = 1,
REFON = 0 → 1
V_CC
MIN TYP
75
75
MAX UNIT
µs
(8) The condition is that the error in a conversion started after t_REFON is less than ±0.5 LSB. The settling time depends on the external
capacitive load when REFOUT = 1.
12-Bit DAC, Supply Specifications
over recommended ranges of supply voltage and operating free-air temperature (unless otherwise noted)
PARAMETER
AV_CC Analog supply voltage
TEST CONDITIONS
AV_CC = DV_CC, AV_SS = DV_SS = 0 V
DAC12AMPx = 2, DAC12IR = 0,
DAC12IOG = 1,
DAC12_xDAT = 0800h,
VeREF+ = VREF+ = 1.5 V
V_CC
MIN TYP
2.20
3V
65
DAC12AMPx = 2, DAC12IR = 1,
DAC12_xDAT = 0800h,
125
I_DD
Supply current, single DAC channel^{(1) (2) VeREF+ = VREF+ = AV}CC
DAC12AMPx = 5, DAC12IR = 1,
DAC12_xDAT = 0800h,
2.2 V, 3 V
250
VeREF+ = VREF+ = AV_CC
DAC12AMPx = 7, DAC12IR = 1,
DAC12_xDAT = 0800h,
750
VeREF+ = VREF+ = AV_CC
DAC12_xDAT = 800h,
VeREF+ = 1.5 V, ΔAV_CC = 100 mV
2.2 V
70
PSRR Power supply rejection ratio^{(3) (4)}
DAC12_xDAT = 800h,
VeREF+ = 1.5 V or 2.5 V,
3V
70
ΔAV_CC = 100 mV
MAX UNIT
3.60 V
110
165
µA
350
1100
dB
(1) No load at the output pin, DAC12_0 or DAC12_1, assuming that the control bits for the shared pins are set properly.
(2) Current into reference terminals not included. If DAC12IR = 1 current flows through the input divider; see Reference Input specifications.
(3) PSRR = 20 log (ΔAV_CC / ΔV_{DAC12_xOUT})
(4) The internal reference is not used.
12-Bit DAC, Linearity Specifications
over recommended ranges of supply voltage and operating free-air temperature (unless otherwise noted) (see Figure 17)
INL
DNL
PARAMETER
Resolution
Integral
nonlinearity ⁽¹⁾
Differential
nonlinearity ⁽¹⁾
TEST CONDITIONS
12-bit monotonic
VeREF+ = 1.5 V, DAC12AMPx = 7, DAC12IR = 1
VeREF+ = 2.5 V, DAC12AMPx = 7, DAC12IR = 1
VeREF+ = 1.5 V, DAC12AMPx = 7, DAC12IR = 1
VeREF+ = 2.5 V, DAC12AMPx = 7, DAC12IR = 1
V_CC
2.2 V
3V
2.2 V
3V
MIN TYP MAX UNIT
12
bits
±2 ±4⁽²⁾
LSB
±2
±4
±0.4
±0.4
±1 ⁽²⁾
LSB
±1
(1) Parameters calculated from the best-fit curve from 0x0F to 0xFFF. The best-fit curve method is used to deliver coefficients "a" and "b" of
the first-order equation: y = a + bx. V_{DAC12_xOUT} = E_O + (1 + E_G) × (VeREF+/4095) × DAC12_xDAT, DAC12IR = 1.
(2) This parameter is not production tested.
68
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