ZHCSDO6 数据表 | 德州仪器 TI.com.cn

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

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8.8.14.1 Operational Amplifier, OA0, OA1, PGA Buffers

over operating free-air temperature range (unless otherwise noted)

PARAMETER		TEST CONDITIONS	V_CC	MIN	TYP	MAX	UNIT
V_CC	Analog supply voltage	AV_CC = DV_CC, AV_SS = DV_SS = 0 V		2.2		3.6	V
C_CPCAP	External charge pump capacitor to AVSS.	Required when charge pump is enabled		20	22	24	nF
I_{CP_PEAK}	Charge pump peak current	OARRI = 0h to 1h, I_{CP_LOAD} = 0 μA			1.6		mA
I_CP	Charge pump average current	OARRI = 1h, I_{CP_LOAD} = 100 μA			570⁽¹⁾	710⁽¹⁾	μA
t_{CP_EN_fast}	Charge pump enable time fast	OARRI = 0h to 1h, I_{CP_LOAD} = 0 μA, AFE biases previously enabled and settled which can be done with REFON=1 or other modules requesting REFON.			50		μs
t_{CP_EN_slow}	Charge pump enable time slow	OARRI = 0h to 1h, I_{CP_LOAD} = 0 μA, Includes AFE bias settling			75		μs
I_OA	Supply current, per opamp	I_O = 0 mA, OARRI = 0h (charge pump disabled)			105⁽¹⁾	130⁽¹⁾	μA
V_OS	Input offset voltage	Noninverting, unity gain			±2		mV
dV_OS/dT	Input offset voltage temperature drift	Noninverting, unity gain			±1		μV/°C
dV_OS/dV	Input offset voltage voltage drift	Noninverting, unity gain			±3		μV/V
C_in	Input capacitance	Differential			4		pF
C_in	Input capacitance	Common mode			6		pF
PSRR_DC	Power supply rejection ratio, DC	Noninverting, unity gain, V_INP = positive input of OA = 1 V			50		μV/V
V_CM	Common mode voltage range⁽²⁾	OARRI = 0h, Noninverting, unity gain		0.1		V_CC - 1.0	V
V_CM	Common mode voltage range⁽²⁾	OARRI = 1h, Noninverting, unity gain		0.1		V_CC - 0.1	V
CMRR_DC	Common mode rejection ratio, DC	Over common-mode voltage range			110		dB
e_n	Input voltage noise density	f = 100 Hz, OARRI = 0h or 1h	3.0 V		90		nV/√Hz
e_n	Input voltage noise density	f = 50 kHz, OARRI = 0h or 1h	3.0 V		25		nV/√Hz
A_OL	Open-loop voltage gain, DC				95		dB
GBW	Gain-bandwidth product	C_L = 100 pF, OAM = 1h			800		kHz
SR	Slew rate	Noninverting, unity gain, C_L = 100 pF, OAM = 1h			0.4		V/μs
t_SETTLE	Settling time	Noninverting, unity gain, 2.0-V step, 0.1%, OAM = 1h	3.0 V		5.3		μs
V_O	Voltage output swing from rail	–250 μA ≤ I_O ≤ 250 μA, Noninverting, unity gain (OAM = 1h)			5	55	mV
t_{EN_FAST}	Enable time fast	Noninverting, unity gain, OAM = 0h transition to 1h, AFE biases previously enabled and settled which can be done with REFON = 1 or other modules requesting REFON⁽³⁾			3	7	μs
t_{EN_SLOW}	Enable time slow	Noninverting,unity gain, OARRI = 0h transition to 1h, OAM = 0h transition to 1h, Includes AFE bias and charge pump settling⁽³⁾			190	225	μs
t_DIS	Disable time				0.4		μs

(1) See Section 8.8.14.2 to calculate total current from OA for different use cases.

(2) The common-mode input range is measured with the OA in a unity-gain source-follower configuration. The input signal is swept from 0 V to V_CC, and the output of the OA is monitored. The minimum and maximum values represent when the input and output differ more than 10 mV, not including the offset, V_OS.

(3) The AFE bias is used by several modules including the OA charge pump, OA, and CTSD16. Any of these modules will request the AFE bias when enabled. The AFE bias is generated by the REF module, so enabling the REF module also enables the AFE bias.

Section 8.8.14.2 explains how to compute the total current, I_TOTAL, when the OA and associated modules are used. See Table 8-1 for a similar table for the CTSD16. A "yes" means it must be included in computing I_TOTAL.

As an example, assume that the application uses the CTS16D in rail-to-rail input mode (CTSD16RRI = 1) with the internal reference (CTSD16REFS = 1) and OA0 and OA1 are enabled in rail-to-rail input modes, OARRI = 1. The total current, I_TOTAL, would be computed as follows:

I_TOTAL = I_CTSD16 + I_CTSD16CLK+ I_CP + I_REFBG + 2 × I_OA

Figure 8-25 OA Offset Voltage Sample Production Distribution

Figure 8-26 OA Offset Voltage Drift Sample Production Distribution