Linear Technology LT1019 Datasheet

FEATURES

■Tight Initial Output Voltage: <0.05%

■Ultralow Drift: 3ppm/°C Typical

■Series or Shunt Operation

■Curvature Corrected

■Ultrahigh Line Rejection: ≈0.5ppm/V

■Low Output Impedance: ≈0.02Ω

■Plug-In Replacement for Present References

■Available at 2.5V, 4.5V, 5V, and 10V

■100% Noise Tested

■Temperature Output

■Industrial Temperature Range in SO-8

APPLICATIOUS

■Negative Shunt References

■A/D and D/A Converters

■Precision Regulators

■Constant Current Sources

■V/F Converters

■Bridge Excitation

LT1019

Precision Reference

DESCRIPTIOU

The LT®1019 is a third generation bandgap voltage reference utilizing thin film technology and a greatly improved curvature correction technique. Wafer level trimming of both reference and output voltage combines to produce units with high yields to very low TC and tight initial tolerance of output voltage.

The LT1019 can both sink and source up to 10mA and can be used in either the series or shunt mode. This allows the reference to be used for both positive and negative output voltages without external components. Minimum input/ output voltage is less than 1V in the series mode, providing improved tolerance of low line conditions.

The LT1019 is available in four voltages: 2.5V, 4.5V, 5V and 10V. It is a direct replacement for most bandgap references presently available including AD580, AD581, REF-01, REF-02, MC1400, MC1404 and LM168.

, LTC and LT are registered trademarks of Linear Technology Corporation.

TYPICAL APPLICATIOUN

Ultralinear Strain Guage

15V	357Ω*	5V
	0.5W
IN	OUT			R3
		350Ω		2M
LT1019-5
		BRIDGE
	GND		R2
		+	20k
			–
		A1†	R4	A2	GAIN = 100
		LT1637	20k	LT1001
		–	+
		ACTIVE
		ELEMENT	R5
			2M	R6**
				2M
		–5V		LT1019 • TA01
		357Ω*	*REDUCES REFERENCE AND AMPLIFIER
		0.5W	LOADING TO ≈0.

	–15V	**IF R6 = R3, BRIDGE IS NOT LOADED BY R2 AND R4.
		†A1 VOS AND DRIFT ARE NOT CRITICAL BECAUSE A2
		ACTS AS A DIFFERENTIAL AMPLIFIER.

Output Voltage Drift

	1.003
(V)	1.002			10ppm/°C
(NORMALIZED)
			FULL TEMP RANGE “BOX”
	1.001
							LT1019
	1.000						CURVE
VOLTAGE
	0.999			5ppm/°C
OUTPUT			0°C TO 70°C “BOX”
	0.998		UNCOMPENSATED
			“STANDARD” BANDGAP
	0.997			DRIFT CURVE
				25	50	75	100	125
	–50	–25	0

TEMPERATURE (˚C)

1019 TA02

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LT1019

ABSOLUTE

WAXIWUW

RATIUGS (Note 1)

Input Voltage ..........................................................	40V	Specified Temperature Range	0°C to 70°C
Output Voltage (Note 2)		Commercial .............................................
LT1019-5, LT1019-10 ........................................	16V	Industrial ............................................	– 40°C to 85°C
LT1019-2.5, LT1019-4.5 ......................................	7V	Military .............................................	– 55°C to 125°C
Output Short-Circuit Duration (Note 2)		Trim Pin Voltage ...................................................	±30V
VIN < 20V ....................................................	Indefinite	Temp Pin Voltage .....................................................	5V
20V ≤ VIN ≤ 35V .............................................	10 sec	Storage Temperature Range (Note 11)	– 65°C to 150°C
		Lead Temperature (Soldering, 10 sec).................	300°C

PACKAGE/ORDER IUFORWATIOU

	TOP VIEW	TOP VIEW	TOP VIEW
	DNC*

DNC*		8	7	DNC*	DNC*	1	8	DNC*	DNC*	1	8	DNC*
		1			INPUT	2	7	DNC*
									INPUT	2	7	DNC*
INPUT	2		6	OUTPUT	TEMP	3	6	OUTPUT	TEMP	3	6	OUTPUT
TEMP		3	5	TRIM	GND	4	5	TRIM	GND	4	5	TRIM
		4

	GND (CASE)		N8 PACKAGE		S8 PACKAGE
			8-LEAD PDIP		8-LEAD PLASTIC SO
	H PACKAGE
			*INTERNALLY CONNECTED. DO NOT		*INTERNALLY CONNECTED. DO NOT
	8-LEAD TO-5 METAL CAN
			CONNECT EXTERNALLY.		CONNECT EXTERNALLY.
	*INTERNALLY CONNECTED. DO NOT
	CONNECT EXTERNALLY		TJMAX = 100°C, θJA = 130°C/ W		TJMAX = 100°C, θJA = 130°C/ W
	TJMAX = 150°C, θJA = 150°C/ W, θJC = 45°C/W
	ORDER PART		ORDER PART		ORDER PART		S8 PART
	NUMBER		NUMBER		NUMBER		MARKING
	LT1019ACH-2.5	LT1019CH-2.5	LT1019ACN8-2.5 LT1019CN8-5		LT1019ACS8-2.5		19A25
	LT1019ACH-4.5	LT1019CH-4.5	LT1019ACN8-4.5	LT1019CN8-10	LT1019ACS8-5		19A05
	LT1019ACH-5	LT1019CH-5	LT1019ACN8-5	LT1019IN8-2.5	LT1019AIS8-2.5		19AI2
	LT1019ACH-10	LT1019CH-10	LT1019ACN8-10 LT1019IN8-4.5		LT1019AIS8-5		19AI5
	LT1019AMH-2.5	LT1019MH-2.5	LT1019CN8-2.5 LT1019IN8-5		LT1019CS8-2.5		1925
	LT1019AMH-4.5	LT1019MH-4.5	LT1019CN8-4.5	LT1019IN8-10	LT1019CS8-4.5		1945
	LT1019AMH-5	LT1019MH-5			LT1019CS8-5		1905
	LT1019AMH-10	LT1019MH-10			LT1019CS8-10		1910
					LT1019IS8-2.5		19I25
					LT1019IS8-5		19I05

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								LT1019
AVAILABLE OPTIOUS
	OUTPUT			TEMPERATURE			PACKAGE TYPE
	VOLTAGE	TEMPERATURE	ACCURACY	COEFFICIENT		TO-5	SO-8	PDIP-8
	(V)	(°C)	(%)	(ppm/°C)		H8	S8	N8
2.5		0 to 70	0.05	5		LT1019ACH-2.5	LT1019ACS8-2.5	LT1019ACN8-2.5
			0.2	20		LT1019CH-2.5	LT1019CS8-2.5	LT1019CN8-2.5
		– 40 to 85	0.05	10			LT1019AIS8-2.5
			0.2	20			LT1019IS8-2.5	LT1019IN8-2.5
		– 55 to 125	0.05	10		LT1019AMH-2.5
			0.2	25		LT1019MH-2.5
4.5		0 to 70	0.05	5		LT1019ACH-4.5		LT1019ACN8-4.5
			0.2	20		LT1019CH-4.5	LT1019CS8-4.5	LT1019CN8-4.5
		– 40 to 85	0.2	20				LT1019IN8-4.5
		– 55 to 125	0.05	10		LT1019AMH-4.5
			0.2	25		LT1019MH-4.5
5		0 to 70	0.05	5		LT1019ACH-5	LT1019ACS8-5	LT1019ACN8-5
			0.2	20		LT1019CH-5	LT1019CS8-5	LT1019CN8-5
		– 40 to 85	0.05	10			LT1019AIS8-5
			0.2	20			LT1019IS8-5	LT1019IN8-5
		– 55 to 125	0.05	10		LT1019AMH-5
			0.2	25		LT1019MH-5
10		0 to 70	0.05	5		LT1019ACH-10		LT1019ACN8-10
			0.2	20		LT1019CH-10	LT1019CS8-10	LT1019CN8-10
		– 40 to 85	0.2	20				LT1019IN8-10
		– 55 to 125	0.05	10		LT1019AMH-10
			0.2	25		LT1019MH-10

ELECTRICAL CHARACTERISTICS

The ● denotes specifications which apply over the full operating temperature range, otherwise specifications are TA = 25°C.

VIN = 15V, IOUT = 0 unless otherwise noted.

					LT1019A			LT1019
SYMBOL	PARAMETER	CONDITIONS		MIN	TYP	MAX	MIN	TYP	MAX	UNITS
	Output Voltage Tolerance				0.02	0.05		0.02	0.2	%
TC	Output Voltage	LT1019C (0°C to 70°C)	●		3	5		5	20	ppm/°C
	Temperature Coefficient	LT1019I (– 40°C to 85°C)	●		3	10		5	20	ppm/°C
	(Note 3)	LT1019M (– 55°C to 125°C)	●		5	10		8	25	ppm/°C
VOUT	Line Regulation (Note 4)	(VOUT + 1.5V) ≤ VIN ≤ 40V			0.5	3		0.5	3	ppm/V
VIN			●		1.0	5		1.0	5	ppm/V
RR	Ripple Rejection	50Hz ≤ f ≤ 400Hz		90	110		90	110		dB
			●	84			84			dB

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LT1019

ELECTRICAL CHARACTERISTICS

The ● denotes specifications which apply over the full operating temperature range, otherwise specifications are TA = 25°C.

VIN = 15V, IOUT = 0 unless otherwise noted.

					LTC1019A			LTC1019
SYMBOL	PARAMETER	CONDITIONS		MIN	TYP	MAX	MIN	TYP	MAX	UNITS
VOUT	Load Regulation Series	0 ≤ IOUT ≤ 10mA (Note 5)			0.02	0.05		0.02	0.05	mV/mA (Ω)
IOUT	Mode (Notes 4, 5)		●			0.08			0.08	mV/mA (Ω)
	Load Regulation,	1mA ≤ ISHUNT ≤ 10mA (Notes 5, 6)			0.1	0.4		0.1	0.4	mV/mA (Ω)
	Shunt Mode	2.5V, 4.5V, 5V	●
		10V	●			0.8			0.8	mV/mA (Ω)
	Thermal Regulation (Note 7)	P = 200mW, t = 50ms			0.1	0.5		0.1	0.5	ppm/mW
IQ	Quiescent Current				0.65	1.0		0.65	1.2	mA
	Series Mode		●			1.3			1.5	mA
	Minimum Shunt Current	(Note 8)	●		0.5	0.8		0.5	0.8	mA
	Minimum Input/Output	IOUT ≤ 1mA	●		0.9	1.1		0.9	1.1	V
	Voltage Differential	IOUT = 10mA	●			1.3			1.3	V
	Trim Range	LT1019-2.5		±3.5	±6		±3.5	±6		%
		LT1019-5		±3.5	5, – 13		±3.5	5, – 13		%
		LT1019-10		±3.5	5, – 27		±3.5	5, – 27		%
ISC	Short-Circuit Current	2V ≤ VIN ≤ 35V		15	25	50	15	25	50	mA
	Output Connected to GND		●	10			10			mA
en	Output Voltage Noise	10Hz ≤ f ≤ 1kHz			2.5	4		2.5	4	ppm (RMS)
	(Note 10)	0.1Hz ≤ f ≤ 10Hz			2.5			2.5		ppm (P-P)

Note 1: Absolute Maximum Ratings are those values beyond which the life of a device may be impaired.

Note 2: These are high power conditions and are therefore guaranteed only at temperatures equal to or below 70°C. Input is either floating, tied to output or held higher than output.

Note 3: Output voltage drift is measured using the box method. Output

voltage is recorded at TMIN, 25°C and TMAX. The lowest of these three readings is subtracted from the highest and the resultant difference is

divided by (TMAX – TMIN).

Note 4: Line regulation and load regulation are measured on a pulse basis with low duty cycle. Effects due to die heating must be taken into account separately. See thermal regulation and application section.

Note 5: Load regulation is measured at a point 1/8" below the base of the package with Kelvin contacts.

Note 6: Shunt regulation is measured with the input floating. This parameter is also guaranteed with the input connected (VIN – VOUT) > 1V, 0mA ≤ ISINK ≤ 10mA. Shunt and sink current flow into the output.

Note 7: Thermal regulation is caused by die temperature gradients created by load current or input voltage changes. This effect must be added to normal line or load regulation.

Note 8: Minimum shunt current is measured with shunt voltage held 20mV below the value measured at 1mA shunt current.

Note 9: Minimum input/output voltage is measured by holding input voltage 0.5V above the nominal output voltage, while measuring VIN – VOUT.

Note 10: RMS noise is measured with a single pole highpass filter at 10Hz and a 2-pole lowpass filter at 1kHz. The resulting output is full-wave rectified and then integrated for a fixed period, making the final reading an average as opposed to RMS. A correction factor of 1.1 is used to convert from average to RMS, and a second correction of 0.88 is used to correct the nonideal bandpass of the filters.

Note 11: If the part is stored outside of the specified temperature range, the output may shift due to hysteresis.

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