Datasheet

ManualsBrandsLINEAR TECHNOLOGY ManualsPMICsPMIC - voltage reference Series Adjustable SOIC 8

LT1027

sn1027 1027fcs

Precision

5V Reference

ANALOG

INPUTS

OUT

TRIM

GND

10k 22µF

8V TO 40V

LT1027

TO µC

CH0

CH1

CH2

CH3

CH4

CH5

CH6

CH7

REF

–

COM

AGND

–

DGND

LTC1290

1027 TA01

CLK

OUT

2.2µF

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

Output Voltage

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

Supplying V

REF

and V

to the LTC

1290 12-bit ADC

■

Very Low Drift: 2ppm/°C Max TC

■

Pin Compatible with LT1021-5, REF-02,

(PDIP Package)

■

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

P-P

Noise (0.1Hz to 10Hz)

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.

■

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

■

Digital Voltmeters

■

Reference Standard

■

Precision Current Source

FEATURES

DESCRIPTIO

APPLICATIO S

TYPICAL APPLICATIO

Summary of content (8 pages)

PAGE 1
LT1027 Precision 5V Reference U FEATURES ■ ■ ■ ■ ■ ■ ■ DESCRIPTIO Very Low Drift: 2ppm/°C Max TC Pin Compatible with LT1021-5, REF-02, (PDIP Package) 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 P-P Noise (0.1Hz to 10Hz) 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.
PAGE 2
LT1027 W W W AXI U U ABSOLUTE RATI GS (Note 1) Supply Voltage (VIN) ............................................... 40V Input-Output Voltage Differential ............................ 35V Output to Ground Voltage ......................................... 7V VTRIM to Ground Voltage Positive ................................................................ 5V Negative .......................................................... – 0.3V Output Short-Circuit Duration VIN > 20V ................................
PAGE 3
LT1027 ELECTRICAL CHARACTERISTICS The ● denotes specifications which apply over the full operating temperature range otherwise specifications are at TA = 25°C. VIN = 10V, ILOAD = 0, unless otherwise specified. SYMBOL PARAMETER CONDITIONS Line Regulation (Note 4) 8V ≤ VIN ≤ 10V MIN TYP MAX UNITS 6 12 25 ppm/V ppm/V 3 6 8 ppm/V ppm/V –3 6 8 ppm/mA ppm/mA 30 120 ppm/mA 2.2 3.1 3.
PAGE 4
LT1027 U W TYPICAL PERFOR A CE CHARACTERISTICS Start-Up and Turn-Off (No Load) Start-Up and Turn-Off Quiescent Current 2.5 SUPPLY CURRENT (mA) 2.0 VOUT 1V/DIV VOUT 1V/DIV 10V 10V VIN VIN RL = 1k, CL = 4.7µF 1µs/DIV 1027 G04 500µs/DIV 1027 G05 1.5 1.0 0.
PAGE 5
LT1027 U W U UO APPLICATI S I FOR ATIO MAXIMUM TEMPERATURE COEFFICIENT FOR 0.5LSB ERROR (ppm/°C) Effect of Reference Drift on System Accuracy A large portion of the temperature drift error budget in many systems is the system reference voltage. Figure 1 indicates the maximum temperature coefficient allowable if the reference is to contribute no more than 0.5LSB error to the overall system performance. The example shown is a 12-bit system designed to operate over a temperature range from 25°C to 65°C.
PAGE 6
LT1027 W U U UO APPLICATI S I FOR ATIO INPUT R1 91Ω KEEP THIS LINE RESISTANCE LOW INPUT LT1027 IN 2N4403 OUT + IN LOAD GND LT1027 GROUND RETURN OUT R2* 2.4k GND 1027 F02 + 4.7µF LOAD Figure 2. Standard Hook-Up GROUND RETURN 1027 F03 *OPTIONAL–REDUCES CURRENT IN OUTPUT SENSE LEAD Figure 3. Driving Higher Load Currents U TYPICAL APPLICATIONS 10V Reference 10V Reference VIN VIN IN VIN + OUT 7 10.
PAGE 7
LT1027 U W EQUIVALE T SCHE ATIC VIN VOUT NR VADJ 1027 ES OUTPUT CURRENT LIMIT AND BIAS CIRCUITS NOT SHOWN GND U PACKAGE DESCRIPTIO H Package 8-Lead TO-5 Metal Can (.230 Inch PCD) (Reference LTC DWG # 05-08-1321) 0.335 – 0.370 (8.509 – 9.398) DIA 0.305 – 0.335 (7.747 – 8.509) 0.040 (1.016) MAX 0.050 (1.270) MAX SEATING PLANE 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) 0.016 – 0.021** (0.406 – 0.533) 0.027 – 0.045 (0.
PAGE 8
LT1027 U PACKAGE DESCRIPTIO N8 Package 8-Lead PDIP (Narrow .300 Inch) (Reference LTC DWG # 05-08-1510) 0.300 – 0.325 (7.620 – 8.255) 0.009 – 0.015 (0.229 – 0.381) ( 0.130 ± 0.005 (3.302 ± 0.127) 0.045 – 0.065 (1.143 – 1.651) 0.065 (1.651) TYP 8 7 6 5 1 2 3 4 0.255 ± 0.015* (6.477 ± 0.381) +0.035 0.325 –0.015 +0.889 8.255 –0.381 0.400* (10.160) MAX ) 0.125 (3.175) 0.020 MIN (0.508) MIN 0.018 ± 0.003 (0.457 ± 0.076) 0.100 (2.