Datasheet

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LT1019

1019fd

Precision Reference

The LT

1019 is a third generation bandgap voltage refer-

ence utilizing thin film technology and a greatly improved

curvature correction technique. Wafer level trimming of

both reference and output voltage combines to produce

very low TC and tight initial output voltage tolerance.

The LT1019 can both sink and source up to 10mA and can

be used in either the series or shunt mode, allowing the

reference to operate with positive or 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 and excellent

line regulation.

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.

■

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

■

Available in 8-Lead N8 and S8 Packages

■

Negative Shunt References

■

A/D and D/A Converters

■

Precision Regulators

■

Constant Current Sources

■

V/F Converters

■

Bridge Excitation

Ultralinear Strain Gauge

Output Voltage Drift

FEATURES

DESCRIPTIO

APPLICATIO S

TYPICAL APPLICATION

–

†

LT1637

–

LT1001

20k

GAIN = 100

R6**

LT1019-5

GND

OUT

15V

357Ω*

0.5W

ACTIVE

ELEMENT

350Ω

BRIDGE

–15V

–5V

357Ω*

0.5W

REDUCES REFERENCE AND AMPLIFIER

LOADING TO ≈0.

IF R6 = R3, BRIDGE IS NOT LOADED BY R2 AND R4.

A1 V

AND DRIFT ARE NOT CRITICAL BECAUSE A2

ACTS AS A DIFFERENTIAL AMPLIFIER.

†

LT1019 • TA01

TEMPERATURE (˚C)

–50

OUTPUT VOLTAGE (NORMALIZED) (V)

1.001

1.002

1.003

25 75

1019 TA02

1.000

0.999

–25 0

50 100 125

0.998

0.997

5ppm/°C

0°C TO 70°C “BOX”

LT1019

CURVE

UNCOMPENSATED

“STANDARD” BANDGAP

DRIFT CURVE

10ppm/°C

FULL TEMP RANGE “BOX”

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

All other trademarks are the property of their respective owners.

Summary of content (12 pages)

PAGE 1
LT1019 Precision Reference U FEATURES DESCRIPTIO ■ 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 very low TC and tight initial output voltage tolerance. ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ Tight Initial Output Voltage: < 0.05% Ultralow Drift: 3ppm/°C Typical Series or Shunt Operation Curvature Corrected Ultrahigh Line Rejection: ≈ 0.
PAGE 2
LT1019 W W W AXI U U ABSOLUTE RATI GS (Note 1) Specified Temperature Range Commercial ............................................. 0°C to 70°C Industrial ............................................ – 40°C to 85°C Military ............................................. – 55°C to 125°C Trim Pin Voltage ................................................... ±30V Temp Pin Voltage .....................................................
PAGE 3
LT1019 U AVAILABLE OPTIO S OUTPUT VOLTAGE (V) TEMPERATURE (°C) ACCURACY (%) TEMPERATURE COEFFICIENT (ppm/°C) TO-5 H8 PACKAGE TYPE SO-8 S8 PDIP-8 N8 2.5 0 to 70 0.05 0.2 5 20 LT1019ACH-2.5 LT1019CH-2.5 LT1019ACS8-2.5 LT1019CS8-2.5 LT1019ACN8-2.5 LT1019CN8-2.5 – 40 to 85 0.05 0.2 10 20 LT1019AIS8-2.5 LT1019IS8-2.5 LT1019IN8-2.5 – 55 to 125 0.05 0.2 10 25 LT1019AMH-2.5 LT1019MH-2.5 0 to 70 0.05 0.2 5 20 LT1019ACH-4.5 LT1019CH-4.5 LT1019CS8-4.5 LT1019ACN8-4.5 LT1019CN8-4.
PAGE 4
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. SYMBOL PARAMETER CONDITIONS ∆VOUT ∆IOUT Load Regulation Series Mode (Notes 4, 5) 0 ≤ IOUT ≤ 10mA (Note 5) Load Regulation, Shunt Mode 1mA ≤ ISHUNT ≤ 10mA (Notes 5, 6) 2.5V, 4.
PAGE 5
LT1019 U W TYPICAL PERFOR A CE CHARACTERISTICS Quiescent Current (LT1019-4.5/LT1019-5) Quiescent Current (LT1019-10) 1.6 1.6 1.6 1.4 1.4 1.4 1.2 1.2 125°C 0.8 25°C –55°C 0.6 1.2 CURRENT (mA) 1.0 CURRENT (mA) CURRENT (mA) Quiescent Current (LT1019-2.5) 125°C 1.0 25°C 0.8 –55°C 0.6 0.4 0.2 0.2 0.
PAGE 6
LT1019 U W TYPICAL PERFOR A CE CHARACTERISTICS Temp Pin Voltage 140 120 0.75 0.70 0.65 0.60 0.55 0.50 10 IOUT TJ = 25°C 100 OUTPUT CAPACITOR (µF) OUTPUT VOLTAGE CHANGE (µV) 0.90 0.85 0.80 VOLTAGE (V) LT1019-2.5* Stability with Output Capacitance Line Regulation 80 60 LT1019-10 40 20 LT1019-2.5 LT1019-5 0 –10 1 REGION OF POSSIBLE INSTABILITY 0.1 0.01 0.001 –20 0.45 0.40 50 25 0 75 100 –50 –25 JUNCTION TEMPERATURE (°C) –30 0 125 5 10 15 20 25 30 INPUT VOLTAGE (V) 35 40 0.
PAGE 7
LT1019 U U W U APPLICATIO S I FOR ATIO the thermal regulation specification. Example: a 10V device with a nominal input voltage of 15V and load current of 5mA. Find the effect of an input voltage change of 1V and a load current change of 2mA. ∆P (line change) = (∆VIN)(ILOAD) = (1V)(5mA) = 5mW ∆VOUT = (0.5ppm/mW)(5mW) = 2.5ppm ∆P (load change) = (∆ILOAD)(VIN – VOUT) = (2mA)(5V) = 10mW ∆VOUT = (0.
PAGE 8
LT1019 U U W U APPLICATIO S I FOR ATIO The worst-case error in initial output voltage for the LT1019 is 0.2%, so a series resistor is satisfactory if the output is simply trimmed to nominal value. The maximum TC shift expected would be 1ppm/°C. Using the Temp Pin The LT1019 has a TEMP pin like several other bandgap references. The voltage on this pin is directly proportional to absolute temperature (PTAT) with a slope of approximately 2.1mV/°C. Room temperature voltage is therefore approximately (295°K)(2.
PAGE 9
LT1019 U TYPICAL APPLICATIO S Trimming LT1019-10 Output to 10.240V Trimming LT1019-5 Output to 5.120V VOUT VOUT VIN OUT IN LT1019-5 TRIM GND 41.2k 1% OUT IN LT1019-10 TRIM GND VIN 5k* ±1% TRIM 90.9k 1% 5k* ±1% TRIM 4.02k 1% 4.02k 1% *LOW TC CERMET *LOW TC CERMET Negative Series Reference Precision 1µA Current Source 15V 11.5k 1% 5k* 8.25k 1% 2.49M 1% OUT 1019 TA06 1019 TA04 V+ IN LT1019 R1* LT1019-2.
PAGE 10
R29 TRIM 80k R3 R2 R1 Q1 R14 72k Q3 5k R8 2.5k R7 1.6k R6 780Ω R4 SHORT FOR 2.5 R9 3k Q2 R5 Q4 R25 1k R37 2k R38 3.75k Q38 Q36 R36 82k Q37 R11B 1k Q7 R11A 1.9k R39 Q5 R42 4k Q6A R26 3k R12 7.2k Q8 Q9 R28 9k 1k R13 24.
PAGE 11
LT1019 U PACKAGE DESCRIPTIO H Package 8-Lead TO-5 Metal Can (0.200 PCD) (LTC DWG # 05-08-1320) 0.335 – 0.370 (8.509 – 9.398) DIA 0.305 – 0.335 (7.747 – 8.509) 0.027 – 0.045 (0.686 – 1.143) 45°TYP PIN 1 0.028 – 0.034 (0.711 – 0.864) 0.040 (1.016) MAX 0.050 (1.270) MAX SEATING PLANE 0.200 (5.080) TYP 0.165 – 0.185 (4.191 – 4.699) GAUGE PLANE 0.010 – 0.045* (0.254 – 1.143) REFERENCE PLANE 0.500 – 0.750 (12.700 – 19.050) 0.110 – 0.160 (2.794 – 4.064) INSULATING STANDOFF 0.016 – 0.021** (0.406 – 0.
PAGE 12
LT1019 U TYPICAL APPLICATION Negative 10V Reference for CMOS DAC OUT 59k 1% LT1019-10 TRIM GND 5k* FB 30pF 5.76k 1% LTC1595 IOUT REF – + 1.2k LT1007 VOUT *LOW TC CERMET, TRIM RANGE = ±1.