ZHCSDO6 数据表 | 德州仪器 TI.com.cn

ZHCSDO6B May 2015 – September 2020 MSP430FG6425 , MSP430FG6426 , MSP430FG6625 , MSP430FG6626

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8.8.13.2 12-Bit DAC, Linearity Specifications

over recommended ranges of supply voltage and operating free-air temperature (unless otherwise noted) (see Figure 8-19)

PARAMETER		TEST CONDITIONS		V_CC	MIN	TYP	MAX	UNIT
	Resolution	12-bit monotonic			12			bits
INL	Integral nonlinearity⁽¹⁾	V_eREF+ = 1.16 V, DAC12AMPx = 7, DAC12IR = 1		2.2 V, 3 V		±2	±4	LSB
INL	Integral nonlinearity⁽¹⁾	V_eREF+ = 2.5 V, DAC12AMPx = 7, DAC12IR = 1		2.2 V, 3 V		±2	±4	LSB
DNL	Differential nonlinearity⁽¹⁾	V_eREF+ = 1.16 V, DAC12AMPx = 7, DAC12IR = 1		2.2 V, 3 V		±0.4	±1	LSB
DNL	Differential nonlinearity⁽¹⁾	V_eREF+ = 2.5 V, DAC12AMPx = 7, DAC12IR = 1		2.2 V, 3 V		±0.4	±1	LSB
E_O	Offset voltage	Without calibration⁽¹⁾ ⁽²⁾	V_eREF+ = 1.16 V, DAC12AMPx = 7, DAC12IR = 1	2.2 V, 3 V			±21	mV
		Without calibration⁽¹⁾ ⁽²⁾	V_eREF+ = 2.5 V, DAC12AMPx = 7, DAC12IR = 1	2.2 V, 3 V			±21
		With calibration⁽¹⁾ ⁽²⁾	V_eREF+ = 1.16 V, DAC12AMPx = 7, DAC12IR = 1	2.2 V, 3 V			±1.5
		With calibration⁽¹⁾ ⁽²⁾	V_eREF+ = 2.5 V, DAC12AMPx = 7, DAC12IR = 1	2.2 V, 3 V			±1.5
d_E(O)/d_T	Offset error temperature coefficient⁽¹⁾	With calibration		2.2 V, 3 V		±10		µV/°C
E_G	Gain error	V_eREF+ = 1.16 V		2.2 V, 3 V			±2.5	%FSR
E_G	Gain error	V_eREF+ = 2.5 V		2.2 V, 3 V			±2.5	%FSR
d_E(G)/d_T	Gain temperature coefficient⁽¹⁾			2.2 V, 3 V		10		ppm of FSR/ °C
t_{Offset_Cal}	Time for offset calibration⁽³⁾	DAC12AMPx = 2		2.2 V, 3 V			165	ms
		DAC12AMPx = 3, 5					66
		DAC12AMPx = 4, 6, 7					16.5

(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) × (Ve_REF+/4095) × DAC12_xDAT, DAC12IR = 1.

(2) The offset calibration works on the output operational amplifier. Offset Calibration is triggered setting bit DAC12CALON

(3) The offset calibration can be done if DAC12AMPx = {2, 3, 4, 5, 6, 7}. The output operational amplifier is switched off with DAC12AMPx = {0, 1}. TI recommends configuring the DAC12 module before initiating calibration. Port activity during calibration may affect accuracy and is not recommended.

Section 8.8.13.3 lists the output specifications of the DAC.