THALER VRE302LS, VRE302AD, VRE302LD, VRE302KS, VRE302KD Datasheet

VRE302
Low Cost
Precision Reference

DESCRIPTION

FEATURES

The VRE302 is a low cost, high precision 2.5V
reference. Packaged in the industry standard 8
pin DIP, the device is ideal for upgrading systems
that use lower performance references.

The device provides ultrastable +2.500V output
with ±0.2500 mV (.01%) initial accuracy and a
temperature coefficient of 0.6 ppm/°C. This
improvement in accuracy is made possible by a
unique, patented multipoint laser compensation
technique developed by Thaler Corporation.
Significant improvements have been made in
other performance parameters as well, including
initial accuracy, warm-up drift, line regulation, and
long-term stability, making the VRE302 series the
most accurate reference available in the standard
8 pin DIP package.

For enhanced performance, the VRE302 has an
external trim option for users who want less than

0.01% initial error. A reference ground pin is
provided to eliminate socket contact resistance
errors.

PIN CONFIGURATION

The VRE302 is recommended for use as a
reference for 14, 16, or 18 bit D/A converters
which require an external precision reference.
The device is also ideal for calibrating scale factor
on high resolution A/D converters. The VRE302
offers superior performance over monolithic
references.

• 2.500 V OUTPUT ± 0.250 mV (.01%)

• TEMPERATURE DRIFT: 0.6 ppm/°C

• LOW NOISE: 1.5

µV

p-p

(0.1-10Hz)

• INDUSTRY STD PINOUT- 8 PIN DIP OR

SURFACE MOUNT PACKAGE

•EXCELLENT LINE REGULATION: 6ppm/V Typ.

• OUTPUT TRIM CAPABILITY

FIGURE 1

VRE302DS REV. F MAY 2001

SELECTION GUIDE

Model

Temp.
Range

°C

Temp.

Coeff.

ppm/°C

VRE302A 0.25 0.6 0°C to +70°C
VRE302B 0.40 1.0 0°C to +70°C
VRE302C 0.50 2.0 0°C to +70°C
VRE302J 0.25 0.6 -40°C to +85°C
VRE302K 0.40 1.0 -40°C to +85°C
VRE302L 0.50 2.0 -40°C to +85°C

For package option add D for DIP or S for Surface Mount
to end of model number.

Initial

Error

mV

THALER CORPORATION • 2015 N. FORBES BOULEVARD • TUCSON, AZ. 85745 • [phone]

5

6

7

8

VRE302

TOP

VIEW

1

2

3

4

N.C.

+V

IN

TEMP

GND

NOISE

REF. GND

V

OUT

TRIM

MODEL A/J B/K C/L

PARAMETER

MIN TYP MAX MIN TYP MAX MIN TYP MAX UNITS

ABSOLUTE RATINGS

Power Supply +13.5+15+22 ****** V
Operating Temp. (

A,B,C)0 +70 * * * * °C

Operating Temp. (

J,K,L)-40 +85 * * * * °C

Storage Temperature -65 +150 * * * * °C
Short Circuit Protection Continuous * *

OUTPUT VOLTAGE

VRE302 2.500 * * V
Temp. Sensor Voltage 630 * * mV

OUTPUT VOLTAGE ERRORS

Initial Error 0.25 0.40 0.50 mV
Warmup Drift 1 2 3 ppm
T

min-Tmax

0.6 1.0 2.0 ppm/°C
Long-Term Stability 6 * * ppm/1000hrs
Noise (.1-10Hz) 1.5 * * µVpp

OUTPUT CURRENT

Range ±10 * * mA

REGULATION

Line 6 10 * * * * ppm/V
Load 3 * * ppm/mA

OUTPUT ADJUSTMENT

Range 10 * * mV

POWER SUPPLY CURRENTS

VRE302 +PS 5 7 * * * * mA

VRE302

NOTES: *Same as A/J Models.

1. The temp. reference TC is 2.1mV/ °C

2. The specified values are without external trim.

3. The temperature coefficient is determined by the box
method using the following formula:

V

max-Vmin

T.C. = x 10

6

V

nominal

x (T

max-Tmin

)

(1)

(5)

(2)

(3)

VRE302DS REV. F MAY 2001

Vps =+15V, T = 25°C, RL = 10KΩ unless otherwise noted.

ELECTRICAL SPECIFICATIONS

4. The specified values are without the external
noise reduction capacitor.

5. The specified values are unloaded.

(4)