Linear Technology LT1027 Datasheet

TEMPERATURE (°C)

–50

OUTPUT VOLTAGE (V)

5.002

5.004

5.006

25 75

1027 TA02

5.000

4.998

–25 0

50 100

4.996

4.994

FEATURES

LT1027

Precision

5V Reference

U

DESCRIPTIO

■

Very Low Drift: 2ppm/°C Max TC

■

Pin Compatible with LT1021-5, REF-02,
(TO-5 and PDIP Packages Only)

■

Output Sources 15mA, Sinks 10mA

■

Excellent Transient Response Suitable for
A-to-D Reference Inputs

■

Noise Reduction Pin

■

Excellent Long Term Stability

■

Less Than 1ppm

Noise (0.1Hz to 10Hz)

P-P

U

APPLICATIO S

■

A-to-D and D-to-A Converters

■

Digital Voltmeters

■

Reference Standard

■

Precision Current Source

U

TYPICAL APPLICATIO

The LT®1027 is a precision reference with extra-low drift,
superior accuracy, excellent line and load regulation and
low output impedance at high frequency. This device is
intended for use in 12- to 16-bit A-to-D and D-to-A
systems where demanding accuracy requirements must
be met without the use of power hungry, heated substrate
references. The fast settling output recovers quickly from
load transients such as those presented by A-to-D converter
reference inputs. The LT1027 brings together both
outstanding accuracy and temperature coefficient
specifications.

The LT1027 reference is based on LTC’s proprietary
advanced subsurface Zener bipolar process which
eliminates noise and stability problems associated with
surface breakdown devices.

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

+

Supplying V

8V TO 40V

2.2µF

REF

V

IN

V

OUT

LT1027

V

TRIM

GND

and VCC to the LTC®1290 12-bit ADC

V

CC

S

CLK

A

CLK

D

OUT

D

CS

–

DGND

V

ANALOG

INPUTS

+

10k 22µF

CH0
CH1
CH2
CH3
CH4
CH5
CH6
CH7

COM

REF

REF

AGND

LTC1290

+

–

Output Voltage

TO µC

IN

1027 TA01

1

LT1027

A

W

O

LUTEXI TIS

S

A

WUW

U

(Note 1)

ARB

G

Supply Voltage (VIN)............................................... 40V

Input-Output Voltage Differential ............................ 35V

Output to Ground Voltage ......................................... 7V

V

to Ground Voltage

TRIM

Positive ................................................................ 5V

Negative .......................................................... –0.3V

Output Short-Circuit Duration

VIN > 20V........................................................ 10 sec

VIN ≤ 20V ................................................... Indefinite

WU

/

PACKAGE

V

IN

T

= 150°C, θJA = 150°C/W, θJC = 45°C/W

JMAX

O

RDER I FOR ATIO

TOP VIEW

NC*

8

1

NC*

2

3

NR

H PACKAGE

8-LEAD TO-5 METAL CAN

7

5

4

GND

6

NC*

V

V

TRIM

OUT

1

NC*

2

V

IN

3

NR

4

GND

N8 PACKAGE
8-LEAD PDIP

T

= 100°C, θJA = 130°C/W T

JMAX

Operating Temperature Range

LT1027C................................................ 0°C to 70°C

LT1027M ......................................... –55°C to 125°C

Storage Temperature Range

All Devices....................................... – 65°C to 150°C

Lead Temperature (Soldering, 10 sec)................. 300°C

U

TOP VIEW

V

GND

TRIM

V

NR

OUT

8

NC*
NC*

7

V

6

OUT

V

5

TRIM

TOP VIEW

1

2

3

4

S8 PACKAGE

8-LEAD PLASTIC SO

= 100°C, θJA = 180°C/W

JMAX

8

V

IN

NC*

7

NC*

6

NC*

5

ORDER PART NUMBER ORDER PART NUMBER

LT1027ACH-5
LT1027BCH-5
LT1027CCH-5
LT1027DCH-5

LT1027BCN8-5
LT1027CCN8-5
LT1027DCN8-5
LT1027ECN8-5

LT1027ECH-5

ORDER PART NUMBER

LT1027CCS8-5
LT1027DCS8-5
LT1027ECS8-5

S8 PART MARKING

1027C5

1027D5

1027E5

*Connected internally. Do not connect external circuitry to these pins. Consult factory for Industrial and Military grade parts.

LECTRICAL C CHARA TERIST

E

temperature range otherwise specifications are at TA = 25°C. VIN = 10V, I

SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS

V

OUT

TCV

OUT

Output Voltage (Note 2) LT1027A 4.9990 5.000 5.0010 V

Output Voltage Temperature Coefficient LT1027A, B ● 1 2 ppm/°C
(Note 3) LT1027C

The ● denotes specifications which apply over the full operating

ICS

= 0, unless otherwise specified.

LOAD

LT1027B, C, D 4.9975 5.000 5.0025
LT1027E 4.9950 5.000 5.0050

● 23

LT1027D
LT1027E

● 25

● 3 7.5

2

LT1027

TEMPERATURE (°C)

–50

OUTPUT VOLTAGE (V)

5.002

5.004

5.006

25 75

1027 G03

5.000

4.998

–25 0

50 100

4.996

4.994

LECTRICAL C CHARA TERIST

E

temperature range otherwise specifications are at TA = 25°C. VIN = 10V, I

SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS

Line Regulation (Note 4) 8V ≤ VIN ≤ 10V 6 12 ppm/V

Load Regulation (Notes 4, 6) Sourcing Current –8 –3 6 ppm/mA

Supply Current 2.2 2.7 mA

V

Adjust Range ● ±30 ±50 mV

TRIM

e

n

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

Note 2: Output voltage is measured immediately after turn-on. Changes
due to chip warm-up are typically less than 0.005%.

Note 3: Temperature coefficient is determined by the "box" method in
which the maximum ∆V

Note 4: Line and load regulation measurements are done on a pulse basis.
Output voltage changes due to die temperature change must be taken into
account separately. Package thermal resistance is 150°C/W for TO-5 (H),
130°C/W for PDIP (N8), and 180°C/W for plastic SO (SO-8).

Output Noise (Note 5) 0.1Hz ≤ f ≤ 10Hz 3 µV

Temperature Hysteresis H package; ∆T = 25°C 10 ppm
Long Term Stability H package 20 ppm/month

over the temperature range is divided by ∆T.

OUT

The ● denotes specifications which apply over the full operating

ICS

= 0, unless otherwise specified.

LOAD

● 25 ppm/V

10V ≤ VIN ≤ 40V 3 6 ppm/V

● 8 ppm/V

≤ 15mA ● – 10 8 ppm/mA

0 ≤ I

OUT

Sinking Current 30 50 ppm/mA
0 ≥ I

≥ –10mA ● 100 ppm/mA

OUT

● 3.1 mA

10Hz ≤ f ≤ 1kHz 2.0 6.0 µV

Note 5: RMS noise is measured with an 8-pole bandpass filter with a
center frequency of 30Hz and a Q of 1.5. The filter output is then rectified
and integrated for a fixed time period, resulting in an average, as opposed
to RMS voltage. A correction factor is used to convert average to RMS.
This value is then used to obtain RMS noise voltage in the 10Hz to 1000Hz
frequency band. This test also screens for low frequency "popcorn" noise
within the bandwidth of the filter. Consult factory for 100% 0.1Hz to 10Hz
noise testing.

Note 6: Devices typically exhibit a slight negative DC output impedance of
–0.015Ω. This compensates for PC trace resistance, improving regulation
at the load.

P-P

RMS

100

120

110

100

90

80

REJECTION (dB)

70

60

50

LPER

Ripple Rejection

VIN = 10V

10

100 1k 10k

FREQUENCY (Hz)

F

O

R

ATYPICA

1027 G01

UW

CCHARA TERIST

E

C

Output Impedance vs Frequency

100

∆I = ±3mA AC

= 5mA

I

SOURCE

10

1

0.1

OUTPUT IMPEDANCE (Ω)

0.01

10

100

1k

FREQUENCY (Hz)

10k

ICS

100k

Output Voltage

1M

1027 G02

3