6.4 Recommended Operating Conditions

over operating free-air temperature range, all the voltages ratings are specified with respect to REF_GND pin voltage

(unless otherwise noted)

MIN

NOM

MAX

UNIT

Voltage

VDD

10

16.5

V

REF_Z

0

8

VHET Heater voltage, V(HEATP - HEATM)

10

42

HEATP

0

42

HEATM

-42

0

OP_STBL

0

VDD

Current

OP_STBL (IOL)

0

5

mA

TA

Operating temperature

-40

70

°C

6.5 Electrical Characteristics

At VDD = 10V, VHET= 30V, TSET = 115℃, CREF_Z = 10µF, CVDD = 1µF, IL = 0mA, T-SET = Open, OP_STBL is pulled up to

5V through 10kΩ resistor, minimum and maximum specifications across supported temperature range, typical specifications

TA = 25℃; unless otherwise noted

PARAMETER

TEST CONDITION

MIN

TYP

MAX

UNIT

ACCURACY AND DRIFT

REF_Z

Output voltage

7.6

V

Output voltage

accuracy

–50

50

mV

Output voltage

temperature

coefficient(1)

TA = 0℃ to 70℃

0.05

0.2

ppm/

℃

HYSTERESIS AND LONG-TERM STABILITY

Long-term stability

1000 hours, TA = 25℃, TSET = 115℃

3

ppm

1000 hours to 5000 hours , TA = 25℃, TSET = 115℃

0.3

Output voltage

hysteresis

Cycle 1

1

ppm

Cycle 2

0.3

ppm

NOISE

enp-p

Low frequency noise

ƒ = 0.1Hz to 10Hz

0.12

ppmp-p

en

Output voltage noise

ƒ = 10Hz to 100Hz,

0.6

uVrms

LINE REGULATION

ΔVREF_Z/

ΔVDD

Line regulation

VDD = 10V to 16.5V

4

10

ppm/V

POWER SUPPLY

VDD

Input voltage

10

16.5

V

VHET

Input voltage

(HEATP - HEATM)

10

42

V

IHET

Start up current

335

mA

Quiescent current

TA = 25℃, TSET = 115℃, VHET = 10V

75

TA = 25℃, TSET = 115℃, VHEATER = 42V

18

IVDD

Quiescent current

15

mA

TURNON TIME

Start-up

VREF_Z

REF_Z settled within ±3ppm from VDD and VHET

power up time

100

sec

Heater regulation time

OP_STBL goes to logic high level form VHET power-up

time

250

ms

REF80

SNAS856A – SEPTEMBER 2024 – REVISED MARCH 2025

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