LT1004-1.2, LT1004-2.5 MICROPOWER INTEGRATED VOLTAGE REFERENCES SLVS022H – JANUARY 1989 – REVISED JULY 1999

D D D D D

Initial Accuracy – ±4 mV for LT1004-1.2 – ±20 mV for LT1004-2.5 Micropower Operation Operates up to 20 mA Very Low Reference Impedance Applications: – Portable Meter Reference – Portable Test Instruments – Battery-Operated Systems – Current-Loop Instrumentation

D PACKAGE (TOP VIEW)

NC NC NC ANODE

1

8

2

7

3

6

4

5

CATHODE NC CATHODE NC

NC – No internal connection Terminals 6 and 8 are internally connected. LP PACKAGE (TOP VIEW)

description

ANODE

The LT1004 micropower voltage reference is a two-terminal band-gap reference diode designed to provide high accuracy and excellent temperature characteristics at very low operating currents. Optimizing the key parameters in the design, processing, and testing of the device results in specifications previously attainable only with selected units.

CATHODE

The LT1004 is a pin-for-pin replacement for the LM285 and LM385 series of references, with improved specifications. It is an excellent device for use in systems in which accuracy was previously attained at the expense of power consumption and trimming. The LT1004C is characterized for operation from 0°C to 70°C. The LT1004I is characterized for operation from –40°C to 85°C.

symbol ANODE (A)

CATHODE (K)

AVAILABLE OPTIONS PACKAGED DEVICES TA

0°C to 70°C –40°C 40°C to 85°C

VZ TYP

SMALL OUTLINE (D)

PLASTIC (LP)

CHIP FORM (Y)

1.2 V

LT1004CD-1.2

LT1004CLP-1.2

LT1004Y-1.2

2.5 V

LT1004CD-2.5

LT1004CLP-2.5

LT1004Y-2.5

1.2 V

LT1004ID-1.2

LT1004ILP-1.2

—

2.5 V

LT1004ID-2.5

LT1004ILP-2.5

—

For ordering purposes, the decimal point in the part number must be replaced with a hyphen (e.g., show the -1.2 suffix as -1-2 and the -2.5 suffix as -2-5). The D package is available taped and reeled. Add the R suffix to the device type (e.g., LT1004CDR-1-2). Chip forms are tested at 25°C.

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

Copyright  1999, Texas Instruments Incorporated

PRODUCTION DATA information is current as of publication date. Products conform to specifications per the terms of Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters.

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1

LT1004-1.2, LT1004-2.5 MICROPOWER INTEGRATED VOLTAGE REFERENCES SLVS022H – JANUARY 1989 – REVISED JULY 1999

schematic LT1004-1.2 CATHODE Q12

7.5 kΩ Q3

200 kΩ

Q11 Q4

Q2 Q10 Q1

20 pF

20 pF

50 kΩ Q9

600 kΩ

300 kΩ

500 kΩ Q5

Q8

500 Ω Q6

Q13

Q7

60 kΩ ANODE LT1004-2.5 CATHODE Q12

7.5 kΩ

200 kΩ

Q11

Q3 Q4 Q2

500 kΩ

Q10 Q1

20 pF

20 pF

50 kΩ

600 kΩ

Q9

300 kΩ

500 kΩ Q5

Q8

500 Ω

Q6

Q13

Q7

500 kΩ

60 kΩ

ANODE NOTE A: All component values shown are nominal.

2

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LT1004-1.2, LT1004-2.5 MICROPOWER INTEGRATED VOLTAGE REFERENCES SLVS022H – JANUARY 1989 – REVISED JULY 1999

absolute maximum ratings over operating free-air temperature range (unless otherwise noted)† Reverse current, IR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30 mA Forward current, IF . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 mA Package thermal impedance, θJA (see Notes 1 and 2): D package . . . . . . . . . . . . . . . . . . . . . . . . . . . . 97°C/W LP package . . . . . . . . . . . . . . . . . . . . . . . . . . 156°C/W Lead temperature 1,6 mm (1/16 inch) from case for 10 seconds . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 260°C Storage temperature range, Tstg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –65°C to 150°C † Stresses beyond those listed under “absolute maximum ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated under “recommended operating conditions” is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability. NOTES: 1. Maximum power dissipation is a function of TJ(max), θJA, and TA. The maximum allowable power dissipation at any allowable ambient temperature is PD = (TJ(max) – TA)/θJA. Operating at the absolute maximum TJ of 150°C can impact reliability. 2. The package thermal impedance is calculated in accordance with JESD 51, except for through-hole packages, which use a trace length of zero.

recommended operating conditions LT1004C

Operating free free-air air temperature temperature, TA

LT1004I

MIN

MAX

0

70

–40

85

UNIT °C

electrical characteristics at specified free-air temperature PARAMETER

VZ

aV

Reference voltage

Z

∆VZ

TEST CONDITIONS IZ = 100 µA

Full range

Average temperature coefficient of reference voltage§

IZ = 10 µA

Change in reference voltage with current

IZ = IZ(min) to 1 mA

LT1004-1.2

LT1004-2.5

TA‡

MIN

TYP

MAX

MIN

TYP

MAX

25°C

1.231

1.235

2.5

2.52

1.239

2.48

LT1004C

1.225

1.245

2.47

2.53

LT1004I

1.225

1.245

2.47

2.53

UNIT

V

20 25°C

IZ = 20 µA

ppm/°C 20

IZ = 1 mA to 20 mA

∆VZ/∆t

Long-term change in reference voltage

IZ(min)

Minimum reference current

zz

Reference impedance

IZ = 100 µA

Vn

Broadband noise voltage

IZ = 100 µA, f = 10 Hz to 10 kHz

IZ = 100 µA

25°C

1

1

Full range

1.5

1.5

25°C

10

10

Full range

20

20

25°C

20

Full range

8

10

12

20

0.2

0.6

0.2

0.6

25°C Full range 25°C

20

1.5 60

ppm/khr

1.5 120

mV

µA Ω µV

‡ Full range is 0°C to 70°C for the LT1004C and –40°C to 85°C for the LT1004I. § The average temperature coefficient of reference voltage is defined as the total change in reference voltage divided by the specified temperature range.

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LT1004-1.2, LT1004-2.5 MICROPOWER INTEGRATED VOLTAGE REFERENCES SLVS022H – JANUARY 1989 – REVISED JULY 1999

electrical characteristics, TA = 25°C

VZ

aV

IZ = 100 µA IZ = 10 µA

Reference voltage Z

LT1004Y-1.2

TEST CONDITIONS

PARAMETER

Average g temperature coefficient of reference voltage†

∆VZ/∆t IZ(min)

Long-term change in reference voltage

zz

Reference impedance

Vn

Broadband noise voltage

LT1004Y-2.5

MIN

TYP

MAX

MIN

TYP

MAX

1.231

1.235

1.239

2.48

2.5

2.52

20

IZ = 20 µA IZ = 100 µA IZ = 100 µA IZ = 100 µA, f = 10 Hz to 10 kHz

V ppm/°C

20

Minimum reference current

UNIT

20

20

ppm/khr

8

12

µA

0.2

0.6

60

0.2 120

0.6

Ω µV

† The average temperature coefficient of reference voltage is defined as the total change in reference voltage divided by the specified temperature range.

TYPICAL CHARACTERISTICS Table of Graphs GRAPH TITLE

FIGURE

LT1004x-1.2 Reverse current vs Reverse voltage

1

Reference-voltage change vs Reverse current

2

Forward voltage vs Forward current

3

Reference voltage vs Free-air temperature

4

Reference impedance vs Reference current

5

Noise voltage vs Frequency

6

Filtered output noise voltage vs Cutoff frequency

7

LT1004x-2.5 Transient response

4

8

Reverse current vs Reverse voltage

9

Forward voltage vs Forward current

10

Reference voltage vs Free-air temperature

11

Reference impedance vs Reference current

12

Noise voltage vs Frequency

13

Filtered output noise voltage vs Cutoff frequency

14

Transient response

15

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LT1004-1.2, LT1004-2.5 MICROPOWER INTEGRATED VOLTAGE REFERENCES SLVS022H – JANUARY 1989 – REVISED JULY 1999

TYPICAL CHARACTERISTICS†

100

LT1004x-1.2

LT1004x-1.2

REVERSE CURRENT vs REVERSE VOLTAGE

REFERENCE-VOLTAGE CHANGE vs REVERSE CURRENT

ÎÎÎÎÎÎ ÎÎÎÎÎÎ

TA = –55°C to 125°C

∆V Z – Reference Voltage Change – mV

I R – Reverse Current – µ A

TA = –55°C to 125°C

10

1

0.2

0.4

0.6

0.8

1

1.2

12

8

4

0

–4 0.01

0.1 0

ÎÎÎÎÎÎÎ ÎÎÎÎÎÎÎ

16

1.4

0.1

Figure 1 LT1004x-1.2

LT1004x-1.2

FORWARD VOLTAGE vs FORWARD CURRENT

REFERENCE VOLTAGE vs FREE-AIR TEMPERATURE

ÎÎÎ

1.245

ÎÎÎÎ ÎÎÎÎ IZ = 100 µA

V Z – Reference Voltage – V

V F – Forward Voltage – V

100

Figure 2

TA = 25°C

1

10

IR – Reverse Current – mA

VR – Reverse Voltage – V

1.2

1

0.8

0.6

0.4

1.24

1.235

1.23

0.2 1.225 0 0.01

0.1

1

10

100

–55 –35 –15

5

25

45

65

85

105 125

TA – Free-Air Temperature – °C

IF – Forward Current – mA

Figure 3

Figure 4

†Data at high and low temperatures are applicable only within the rated operating free-air temperature ranges of the various devices.

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LT1004-1.2, LT1004-2.5 MICROPOWER INTEGRATED VOLTAGE REFERENCES SLVS022H – JANUARY 1989 – REVISED JULY 1999

TYPICAL CHARACTERISTICS† LT1004x-1.2

LT1004x-1.2

REFERENCE IMPEDANCE vs REFERENCE CURRENT

NOISE VOLTAGE vs FREQUENCY

ÎÎÎÎÎÎÎ ÎÎÎÎÎÎÎ

100

ÎÎÎÎÎ ÎÎÎÎÎ

700 600 Vn – Noise Voltage – nV/ Hz

z z – Reference Impedance – Ω

f = 25 Hz TA = –55°C to 125°C

10

1

IZ = 100 µA TA = 25°C

500 400 300 200 100

0.1 0.01

0.1

1

10

0 10

100

100

1k

10 k

100 k

f – Frequency – Hz

IZ – Reference Current – mA

Figure 5

Figure 6

TL1004x-1.2

FILTERED OUTPUT NOISE VOLTAGE vs CUTOFF FREQUENCY

60 50

ÎÎÎÎ ÎÎÎÎÎ ÎÎÎÎÎ ÎÎÎÎ ÎÎÎÎÎ

40

IZ = 100 µA TA = 25°C 100 µA R C

30 20 10 0 0.1

2

RC Low Pass

Input and Output Voltages – V

Filtered Output Noise Voltage – µV

70

LT1004x-2.5

TRANSIENT RESPONSE

ÎÎÎ

1.5

Output

1

36 kΩ VI

0.5 0

ÎÎÎ

5

Input

0 1

10

VO

100

0

100

500

t – Time – µs

Cutoff Frequency – kHz

Figure 7

Figure 8

†Data at high and low temperatures are applicable only within the rated operating free-air temperature ranges of the various devices.

6

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600

LT1004-1.2, LT1004-2.5 MICROPOWER INTEGRATED VOLTAGE REFERENCES SLVS022H – JANUARY 1989 – REVISED JULY 1999

TYPICAL CHARACTERISTICS†

100

LT1004x-2.5

LT1004x-2.5

REVERSE CURRENT vs REVERSE VOLTAGE

FORWARD VOLTAGE vs FORWARD CURRENT

ÎÎÎÎ ÎÎÎÎ

1.2

ÎÎÎÎÎÎÎ

TA = 25°C

1 V F – Forward Voltage – V

I R – Reverse Current – µ A

TA = –55°C to 125°C

10

1

0.8

0.6

0.4

0.2

0

0.1 0

0.5

1

1.5

2

2.5

0.1

0.01

3

VR – Reverse Voltage – V

1

10

100

IF – Forward Current – mA

Figure 9

Figure 10 LT1004x-2.5

REFERENCE VOLTAGE vs FREE-AIR TEMPERATURE

ÎÎÎÎÎ ÎÎÎÎÎ

2.52

IZ = 100 µA

V Z – Reference Voltage – V

2.515 2.51 2.505 2.5 2.495 2.49 2.485 2.48

2.475 –55 –35 –15

5

25

45

65

85

105 125

TA – Free-Air Temperature – °C

Figure 11 †Data at high and low temperatures are applicable only within the rated operating free-air temperature ranges of the various devices.

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LT1004-1.2, LT1004-2.5 MICROPOWER INTEGRATED VOLTAGE REFERENCES SLVS022H – JANUARY 1989 – REVISED JULY 1999

TYPICAL CHARACTERISTICS† LT1004x-2.5

LT1004x-2.5

REFERENCE IMPEDANCE vs REFERENCE CURRENT

NOISE VOLTAGE vs FREQUENCY

ÎÎÎÎÎÎÎ ÎÎÎÎÎÎÎ ÎÎÎÎÎÎÎ

1400

1000

1200

100

Vn – Noise Voltage – nV/ Hz

z z – Reference Impedance – Ω

f = 25 Hz TA = –55°C to 125°C

10

1

ÎÎÎÎÎ ÎÎÎÎÎ IZ = 100 µA TA = 25°C

1000 800 600 400

200 0.1 0.01

0.1

1

10

0 10

100

100

1k

10 k

f – Frequency – Hz

IZ – Reference Current – mA

Figure 12

Figure 13

TL1004x-2.5

FILTERED OUTPUT NOISE VOLTAGE vs CUTOFF FREQUENCY

LT1004x-2.5

TRANSIENT RESPONSE

ÎÎÎÎÎ ÎÎÎÎÎ ÎÎÎÎÎ ÎÎÎÎÎ IZ = 100 µA TA = 25°C

4

100

Input and Output Voltages – V

Filtered Output Noise Voltage –µV

120

RC Low Pass

80

100 µA R

60 C 40

20

3 Output 2 24 kΩ VI

1

VO

0

5 Input 0

0 0.1

1

10

100

0

100

500

t – Time – µs

Cutoff Frequency – kHz

Figure 14

Figure 15

†Data at high and low temperatures are applicable only within the rated operating free-air temperature ranges of the various devices.

8

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100 k

LT1004-1.2, LT1004-2.5 MICROPOWER INTEGRATED VOLTAGE REFERENCES SLVS022H – JANUARY 1989 – REVISED JULY 1999

APPLICATION INFORMATION 100 pF 24 V 24 V 600 µs RC

+ 22 kΩ Output

LM301A

12 kΩ

21 V – 16.9 kΩ†

LT1004-1.2

–5 V 0.05 µF

1.05 kن

10 kΩ 2N3904

TTL Input 56 kΩ

–5 V † 1% metal-film resistors

Figure 16. VI(PP) Generator for EPROMs (No Trim Required)

Network Detail YSI 44201 RT Network YSI 44201

15 V

6250 Ω Red

2.7 kΩ 5% – 10 kΩ 0.1% LT1004-1.2

Brown

Green

1/2 TLE2022

2765 Ω 0.1%

302 kΩ + 1/2 TLE2022

+

0–10 V 0°C–100°C

–

10 kΩ 0.1%

168.3 Ω 0.1%

10 kΩ 0.1%

Figure 17. 0°C-to-100°C Linear-Output Thermometer

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LT1004-1.2, LT1004-2.5 MICROPOWER INTEGRATED VOLTAGE REFERENCES SLVS022H – JANUARY 1989 – REVISED JULY 1999

APPLICATION INFORMATION VI = 6.5 V to 15 V

V+ R

LM334 V–

5.6 kΩ 3

7 8

+

TLC271 2

6

VO = 5 V

– 4

LT1004-1.2

3.01 MΩ 1%

150 pF

1 MΩ 1%

Figure 18. Micropower 5-V Reference

VI ≥ 5 V

9V

100 µA 22 Ω

510 kΩ Output +

1.235 V

50 µF

LT1004-1.2

LT1004-1.2

Figure 19. Low-Noise Reference

Figure 20. Micropower Reference From 9-V Battery

† 100 kΩ

R1 1684 Ω

3 V, Lithium

5 kΩ at 25°C‡

THERMOCOUPLE TYPE

R1

+

J K T S

232 kΩ 298 kΩ 301 kΩ 2.1 MΩ

LT1004-1.2 187 Ω

1800 Ω

+ –

– † Quiescent current ≅ 15 µA ‡ Yellow Springs Inst. Co., Part #44007 NOTE A: This application compensates within ±1°C from 0°C to 60°C.

Figure 21. Micropower Cold-Junction Compensation for Thermocouples

10

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LT1004-1.2, LT1004-2.5 MICROPOWER INTEGRATED VOLTAGE REFERENCES SLVS022H – JANUARY 1989 – REVISED JULY 1999

APPLICATION INFORMATION LT1084 VI ≥ 8 V

IN

5V

OUT

5V

+

ADJ 10 µF

50 kΩ

10 µF

+

301 Ω 1%

LT1004-2.5 2.5 V 100 Ω 1%

LT1004-2.5

Figure 22. 2.5-V Reference

Figure 23. High-Stability 5-V Regulator

VCC+ ≥ 5 V 250 kΩ

15 V

250 kΩ

2 kن

Output

LT1004-1.2 Input –

R1 (see Note A)

TLE2027 2N3904

+ IO (see Note A)

200 kΩ

–5 V

LT1004-1.2

60 kΩ

† May be increased for small output currents NOTE A: R1 ≈

VCC– ≤ –5 V

2V 1.235 V ,I = IO + 10 µA O R1

Figure 24. Ground-Referenced Current Source

Figure 25. Amplifier With Constant Gain Over Temperature

V+ LM334

1.5 V (see Note A)

R

6.8 kΩ

3 kΩ

R ≤ 5 kΩ 1.235 V LT1004-1.2

LT1004-1.2 IO ≈ NOTE A: Output regulates down to 1.285 V for IO = 0.

Figure 26. 1.2-V Reference From 1.5-V Battery

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1.3 V R

Figure 27. Terminal Current Source With Low Temperature Coefficient

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LT1004-1.2, LT1004-2.5 MICROPOWER INTEGRATED VOLTAGE REFERENCES SLVS022H – JANUARY 1989 – REVISED JULY 1999

APPLICATION INFORMATION Battery Output R1† 1%

1 MΩ

12 V + TLC271 –

LO = Battery Low

133 kΩ 1% LT1004-1.2

†R1 sets trip point, 60.4 kΩ per cell for 1.8 V per cell

Figure 28. Lead-Acid Low-Battery-Voltage Detector

LT1084 VI

VI

10 µF

VO

+

ADJ

VO 120 Ω +

LT1004-1.2

R1 ≤

VCC – 1 V 0.015

R1

2 kΩ

VCC–

Figure 29. Variable-Voltage Supply

12

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10 µF

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Copyright  1999, Texas Instruments Incorporated