Scheda tecnica LTZ1000(A) di Analog Devices Inc.

Commenti/errori della scheda tecnica

l ’ LI” LTZ1000 LTZ1 000A TECHNOLOGY 2|]Vp.p N Am L7HEWEAR 1

LTZ1000/LTZ1000A

1000afe

For more information www.linear.com/LTZ1000

Typical applicaTion

FeaTures

applicaTions

DescripTion

Ultra Precision Reference

The LTZ1000 and LTZ1000A are ultra-stable temperature

controllable references. They are designed to provide 7V

outputs with temperature drifts of 0.05ppm/°C, about

1.2µVP-P of noise and long-term stability of 2µV/√kHr.

Included on the chip is a subsurface zener reference, a

heater resistor for temperature stabilization, and a tem-

perature sensing transistor. External circuitry is used to

set operating currents and to temperature stabilize the

reference. This allows maximum flexibility and best long-

term stability and noise.

The LTZ 1000 and LT Z1000A references can provide su-

perior performance to older devices such as the LM199,

provided that the user implements the heater control and

properly manages the thermal layout. To simplify thermal

insulation, the LT Z1000A uses a proprietary die attach

method to provide significantly higher thermal resistance

than the LTZ1000.

Low Noise Reference

n 1.2µVP-P Noise

n 2µV/√kHr Long-Term Stability

n Very Low Hysteresis

n 0.05ppm/°C Drift

n Temperature Stabilized

n 400°C/W Thermal Resistance for LTZ1000A Reduces

Insulation Requirements

n Specified for –55°C to 125°C Temperature Range

n Offered in TO-99 package

n Voltmeters

n Calibrators

n Standard Cells

n Scales

n Low Noise RF Oscillators

Long-Term Stability

L, LT, LTC , LT M , Linear Technology and the Linear logo are registered trademarks of Linear

Technology Corporation. All other trademarks are the property of their respective owners.

–

LTZ1000

OUTPUT

1N4148

LT®1006

VIN ≥ 10V

30k

0.02µF

120Ω

1000 TA01

DAYS

–2

(ppm)

LONG-TERM STABILITY OF A TYPICAL DEVICE FROM TIME = 0

WITH NO PRECONDITIONING OR AGING

1000 TA01b

3020

LTZ1000/LTZ1000A

1000afe

For more information www.linear.com/LTZ1000

absoluTe MaxiMuM raTings

Heater to Substrate ...................................................35V

Collector Emitter Breakdown Q1 ...............................15V

Collector Emitter Breakdown Q2 ...............................35V

Emitter Base Reverse Bias ..........................................2V

Operating Temperature Range .........–55°C ≤ TA ≤ 125°C

Storage Temperature Range ............–65°C ≤ TA ≤ 150°C

Substrate Forward Bias ............................................ 0.1V

(Note 1)

elecTrical characTerisTics

Note 1: Stresses beyond those listed under Absolute Maximum Ratings

may cause permanent damage to the device. Exposure to any Absolute

Maximum Rating condition for extended periods may affect device

reliability and lifetime.

PARAMETER CONDITIONS MIN TYP MAX UNITS

Zener Voltage lZ = 5mA, (VZ + VBEQ1) IQ1 = 100µA

lZ = 1mA, (VZ + VBEQ1) IQ1 = 100µA

7.0

6.9

7.2

7.15

7.5

7.45

Zener Change with Current 1mA ≤ IZ < 5mA 80 240 mV

Zener Leakage Current VZ = 5V 20 200 µA

Zener Noise lZ = 5mA, 0.1Hz < f < 10Hz

1Q1 = 100µA

1.2 2 µVP-P

Heater Resistance IL ≤ 100µA 200 300 420 Ω

Heater Breakdown Voltage 35 V

Transistor Q1 Breakdown IC = 10µA, LVCEO 15 20 V

Transistor Q2 Breakdown IC = 10µA, LVCEO 35 50 V

Q1, Q2 Current Gain IC = 100µA 80 200 450

Thermal Resistance LTZ1000 Time = 5 Minutes

LTZ1000A Time = 5 Minutes

400

°C/W

Long-Term Stability T = 65°C 2 µV√kHr

(Note 2)

Note 2: All testing is done at 25°C. Pulse testing is used for LTZ1000A to

minimize temperature rise during testing. LTZ1000 and LT Z 1000A devices

are QA tested at –55°C and 125°C.

pin conFiguraTion

BOTTOM VIEW

H8 PACKAGE

TO-5 METAL CAN

6 2

TJMAX = 150°C,

LTZ1000CH: θJA = 80°C/W

LTZ1000ACH: θJA = 400°C/W

orDer inForMaTion

LEAD FREE FINISH PART MARKING PACKAGE DESCRIPTION SPECIFIED TEMPERATURE RANGE

LTZ1000ACH#PBF LT Z 1000ACH 8-Lead TO-5 Metal Can (.200 Inch PCD) –55°C to 125°C

LTZ1000CH#PBF LT Z 1000CH 8-Lead TO-5 Metal Can (.200 Inch PCD) –55°C to 125°C

LEAD BASED FINISH PART MARKING PACKAGE DESCRIPTION SPECIFIED TEMPERATURE RANGE

LTZ1000ACH LT Z 1000ACH 8-Lead TO-5 Metal Can (.200 Inch PCD) –55°C to 125°C

LTZ1000CH LT Z 1000CH 8-Lead TO-5 Metal Can (.200 Inch PCD) –55°C to 125°C

Consult LTC Marketing for parts specified with wider operating temperature ranges.

For more information on lead free part marking, go to: http://www.linear.com/leadfree/

This product is only offered in trays. For more information go to: http://www.linear.com/packaging/

LTZ1 000/ LTZ1 000A ZNRURENT ZENER WHH K LTD [mm L7 LJUW 3

LTZ1000/LTZ1000A

1000afe

For more information www.linear.com/LTZ1000

Typical perForMance characTerisTics

Zener Voltage vs Current

Zener Voltage Noise Spectrum

Zener Noise

Die Temperature Rise

vs Heater Power

Die Temperature vs Time

Die Temperature Rise vs Time

pin FuncTions

Pin 1: Heater Positive. Must have a higher positive value

than Pin 2 and Pin 4.

Pin 2: Heater Negative. Must have a higher positive value

than Pin 4. Must have equal or lower potential than Pin 1.

Pin 3: Zener Positive. Must have a higher positive value

than Pin 4.

Pin 4: Substrate and Zener Negative. Must have a higher

positive value than Pin 7. If Q1 is zenered (about 7V) a

permanent degradation in beta will result.

Pin 5: Temperature Compensating Transistor Collector.

Pin 6: Temperature Sensing Transistor Base. If the base

emitter junction is zenered (about 7V) the transistor will

suffer permanent beta degradation.

Pin 7: Emitter of Sensing and Compensating Transistors.

Pin 8: Collector of Sensing Transistor.

ZENER CURRENT (mA)

ZENER VOLTAGE CHANGE (mV)

100

4.0

01.00.5 2.01.5 3.0 3.5 4.5

2.5 5.0

ZENER ALONE

ZENER WITH KELVIN

SENSED Q1

1000 G01

FREQUENCY (Hz)

0.1

200

ZENER VOLTAGE NOISE (nV/√Hz)

250

300

350

400

1 10 100

150

100

450

500

ZENER CURRENT = 0.5mA

ZENER CURRENT = 4mA

1000 G02

TIME (SECONDS)

ZENER VOLTAGE NOISE (2µV/D)

10 20 30 40 50 60

IZ = 4mA

IZ = 0.5mA

1000 G03

DIE TEMPERATURE ABOVE AMBIENT (°C)

HEATER POWER (W)

0.8

0.7

0.6

0.5

0.4

0.3

0.2

0.1

010545 65 85 1259535 55 75 115

LTZ1000

LTZ1000A

1000 G04

TIME (SECONDS)

DIE TEMPERATURE RISE (°C)

125

100

0.1 10 100 1000

HEATER POWER = 0.1W

HEATER POWER = 0.2W

HEATER POWER = 0.3W

LTZ1000A

1000 G05

TIME (SECONDS)

DIE TEMPERATURE RISE (°C)

125

100

0.1 10 100 1000

HEATER POWER = 0.3W

HEATER POWER = 0.7W

LTZ1000

1000 G06

HEATER POWER = 0.5W

LTZ1000/LTZ1000A L7LJCUEN2

LTZ1000/LTZ1000A

1000afe

For more information www.linear.com/LTZ1000

applicaTions inForMaTion

LTZ1000 and LTZ 1000A are capable of providing ultimate

voltage reference performance. Temperature drifts of better

than 0.03ppm/°C and long-term stability on the order of

1µV per month can be achieved. Noise of about 0.15ppm

can also be obtained. This performance is at the expense

of circuit complexity, since external influences can easily

cause output voltage shifts of more than 1ppm.

Thermocouple effects are one of the worst problems and

can give apparent drifts of many ppm/°C as well as cause

low frequency noise. The kovar input leads of the TO-5

package form thermocouples when connected to copper

PC boards. These thermocouples generate outputs of

35µV/°C. It is mandatory to keep the zener and transistor

leads at the same temperature, otherwise 1ppm to 5ppm

shifts in the output voltage can easily be expected from

these thermocouples.

Air currents blowing across the leads can also cause small

temperature variations, especially since the package is

heated. This will look like 1ppm to 5ppm of low frequency

noise occurring over a several minute period. For best

results, the device should be located in an enclosed area

and well shielded from air currents.

Certainly, any temperature gradient externally generated,

say from a power supply, should not appear across the

critical circuitry. The leads to the transistor and zener

should be connected to equal size PC traces to equalize

the heat loss and maintain them at similar temperatures.

The bottom portion of the PC board should be shielded

against air currents as well.

Resistors, as well as having resistance temperature coef-

ficients, can generate thermocouple effects. Some types of

resistors can generate hundreds of microvolts of thermo-

couple voltage. These thermocouple effects in the resistor

can also interfere with the output voltage. Wire wound

resistors usually have the lowest thermocouple voltage,

while tin oxide type resistors have very high thermocouple

voltage. Film resistors, especially Vishay precision film

resistors, can have low thermocouple voltage.

Ordinary breadboarding techniques are not good enough

to give stable output voltage with the LT Z 1000 family

devices. For breadboarding, it is suggested that a small

printed circuit board be made up using the reference, the

amplifier and wire wound resistors. Care must be taken to

ensure that heater current does not flow through the same

ground lead as the negative side of the reference (emitter

of Q1). Current changes in the heater could add to, or

subtract from, the reference voltage causing errors with

temperature. Single point grounding using low resistance

wiring is suggested.

block DiagraM

1 8

Q2 Q1

3 5

62 4 7

*SUBSTRATE DEVICES–DO NOT FORWARD BIAS 1000 TA07

LTZ1 000/ LTZ1 000A ZENER + SENSE l M%/>1T L7 LJUW 5

LTZ1000/LTZ1000A

1000afe

For more information www.linear.com/LTZ1000

Typical applicaTions

Negative Voltage Reference

–

LT1013

1N4148

ZENER – FORCE

ZENER – SENSE

ZENER + SENSE

0.022µF

0.1µF

V– ≥ 10V

6 6

400k*

R4/R5 RATIO

100ppm = ∆R(Ω)

0.012Ω

7Ω

∆R = 0.01%

∆VZ

1ppm

0.3ppm

0.2ppm

1ppm

*PROVIDES TEMPERATURE COMPENSATION, DELETE FOR LTZ1000A

BOTH A1 AND A2 CONTRIBUTE LESS THAN 2µV OF OUTPUT DRIFT OVER A 50°C RANGE

APPROXIMATE CHANGE IN REFERENCE VOLTAGE FOR A 100ppm CHANGE IN RESISTOR VALUES:

2N3904 1k

10k

1M 8

V+ 15V

GND

LT1013

70k

13k R3

70k

120

1000 TA02

Setting Control Temperature

The emitter-base voltage of the control transistor sets the

stabilization temperature for the LTZ1000. With the values

given in the applications, temperature is normally 60°C.

This provides 15°C of margin above a maximum ambient

of 45°C, for example. Production variations in emitter-base

voltage will typically cause about ±10°C variation. Since

the emitter-base voltage changes about 2mV/°C and is

very predictable, other temperatures are easily set.

Because higher temperatures accelerate aging and decrease

long-term stability, the lowest temperature consistent with

the operating environment should be used. The LTZ1000A

should be set about 10°C higher than the LT Z 1000. This

is because normal operating power dissipation in the

LTZ1000A causes a temperature rise of about 10°C. Of

course both types of devices should be insulated from

ambient. Several minutes of warm-up is usual.

For applications not requiring the extreme precision or

the low noise of the LTZ1000, Linear Technology makes a

broad line of voltage references. Devices like the LT1021

can provide drifts as low as 2ppm/°C and devices such as

the LM399A can provide drifts of 1ppm/°C. Only applica-

tions requiring the very low noise or low drift with time of

the LTZ1000 should use this device. See Application Notes

AN-82 and AN-86 for further information. Consult the Linear

Technology Applications department for additional help.

applicaTions inForMaTion

LTZ1000/LTZ1000A — mm . sans: «dww _/ now u ANDAZ mmmam LESS THAN M n; uuwm mun nvzm WC mm

LTZ1000/LTZ1000A

1000afe

For more information www.linear.com/LTZ1000

Adjusting Temperature Coefficient in Unstabilized Applications

Typical applicaTions

–

120Ω

LT1006

70k

15V

1N4148

VOUT+

0.022µF

200

Ω*

HEATER

1N4148

1 MIN

OFFON *

* PULSE HEATER ON AND OFF TO HEAT AND COOL THE REFERENCE. ADJUST

R1 FOR MINIMUM VOLTAGE CHANGE THROUGH A TEMPERATURE CYCLE.

THE –2mV/°C TEMPCO OF THE VBE CANCELS THE +2mV/°C TEMPCO OF THE ZENER.

1000 TA05

Averaging Reference Voltage for Lower Noise and Better Stability Improving Supply Rejection

1.6k

15V

0.01%

OUTPUT

1.6k

30Ω* 30Ω*

150Ω 150Ω

*R = kT

q I

1000 TA03

VIN

15V

1.5k

150Ω

SUPPLY REJECTION AT

VOUT2 = 3mV/V

SUPPLY REJECTION

AT VOUT1 = 20mV/V

VOUT2

VOUT1

50Ω

1000 TA04

7V Positive Reference Circuit

–

2N3904

1N4148

LT1013

0.1µF 0.002µF

0.1µF 400k*

10k

13k

120Ω

70k

ZENER – SENSE

ZENER + SENSE

GROUND

ZENER – FORCE

HEATER RETURN

(TIED TO GROUND)

V+ 15V

*PROVIDES TC COMPENSATION, DELETE FOR LTZ1000A

APPROXIMATE CHANGE IN REFERENCE VOLTAGE FOR A 100ppm (0.01%) CHANGE IN RESISTOR VALUES:

R4/R5 RATIO

∆R(Ω)

0.012Ω

7Ω

∆R = 0.01%

∆VZ

1ppm

0.3ppm

0.2ppm

1ppm

BOTH A1 AND A2 CONTRIBUTE LESS THAN 2µV OF OUTPUT DRIFT OVER A 50°C RANGE

1000 TA06

LTZ1 000/ LTZ1 000A L7 LJUW 7

LTZ1000/LTZ1000A

1000afe

For more information www.linear.com/LTZ1000

Information furnished by Linear Technology Corporation is believed to be accurate and reliable.

However, no responsibility is assumed for its use. Linear Technology Corporation makes no representa-

tion that the interconnection of its circuits as described herein will not infringe on existing patent rights.

revision hisTory

REV DATE DESCRIPTION PAGE NUMBER

D 4/12 Corrected thermal information on H8 package drawing

Corrected Order Information table

Updated Block Diagram to show substrate diode

Added 1N4148 label to diode in application circuit

Added LTC6655 to Related Parts table

E 11/15 Web links added

Correction to Block Diagram, resistor added to substrate diode

Pin numbers corrected on Negative Voltage Reference diagram

all

(Revision history begins at Rev D)

LTZ1000/LTZ1000A H Package 3357 370 3057335 E V‘ 1 wesims i f w + T 7 Ea } ’ 0‘07045‘ H EMU—L 0‘67 02‘“ nan A ‘6 % 0277 045 / no, we 64) (0406mm) L7LJCUEN2

LTZ1000/LTZ1000A

1000afe

For more information www.linear.com/LTZ1000

Linear Technology Corporation

1630 McCarthy Blvd., Milpitas, CA 95035-7417

 LINEAR TECHNOLOGY CORPORATION 1987

LT 1115 REV E • PRINTED IN USA

(408) 432-1900 ● FAX: (408) 434-0507 ● www.linear.com/LTZ1000

relaTeD parTs

PART NUMBER DESCRIPTION COMMENTS

LM399 7V Precision Shunt Reference 0.2% Accuracy, 0.5ppm/°C Drift, 20µVRMS Noise

LT1021 5V, 7V and 10V Precision Reference Available in T0-5, –55°C to 125°C, Series or Shunt Operation

LT1236 5V and 10V Low Drift Precision Reference 0.05% Accuracy, 5ppm/°C Drift, Series or Shunt Operation

LT1389 1.25V, 2.5V, 4V and 5V Nanopower Shunt Reference 800nA, 0.05% Accuracy, 10ppm/°C Drift

LT1634 1.25V and 2.5V Micropower Shunt Reference 0.05%, 10ppm/°C, 10µA Current

LTC6655 Precision Low Noise Reference Family 2ppm/°C, Maximum Drift, 650nVP-P Noise (0.1Hz to 10Hz)

.050

(1.270)

MAX

.016 – .021**

(0.406 – 0.533)

.010 – .045*

(0.254 – 1.143)

SEATING

PLANE

.040

(1.016)

MAX .165 – .185

(4.191 – 4.699)

GAUGE

PLANE

REFERENCE

PLANE

.500 – .750

(12.700 – 19.050)

.305 – .335

(7.747 – 8.509)

.335 – .370

(8.509 – 9.398)

DIA

.200

(5.080)

TYP

.027 – .045

(0.686 – 1.143)

.028 – .034

(0.711 – 0.864)

.110 – .160

(2.794 – 4.064)

INSULATING

STANDOFF

45°

H8(TO-5) 0.200 PCD 0204

LEAD DIAMETER IS UNCONTROLLED BETWEEN THE REFERENCE PLANE

AND THE SEATING PLANE

FOR SOLDER DIP LEAD FINISH, LEAD DIAMETER IS .016 – .024

(0.406 – 0.610)

PIN 1

H Package

8-Lead TO-5 Metal Can (.200 Inch PCD)

(Reference LTC DWG # 05-08-1320)

package DescripTion

Please refer to http://www.linear.com/product/LT Z 1000#packaging for the most recent package drawings.

Scheda tecnica LTZ1000(A) di Analog Devices Inc.

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