VRE107C datasheet, PDF - EEWORLD Datasheet

VRE105/107

Precision

Reference Supplies

THALER CORPORATION • 2015 N. FORBES BOULEVARD • TUCSON, AZ. 85745 • (520) 882-4000

FEATURES

•

VERY HIGH ACCURACY: 5.000 V ±0.4 mV

•

EXTREMELY LOW DRIFT: 0.6 ppm/°C -55°C to +125°C

•

EXCELLENT STABILITY: 6 ppm/1000 Hrs. Typ.

•

EXCELLENT LINE REGULATION: 6 ppm/V Typ.

•

WIDE SUPPLY RANGE: ±13.5 V to ±22.0 V

•

HERMETIC 14-PIN CERAMIC DIP

•

MILITARY PROCESSING OPTION

APPLICATIONS

•

PRECISION A/D and D/A CONVERTERS

•

TRANSDUCER EXCITATION

•

ACCURATE COMPARATOR THRESHOLD

REFERENCE

•

HIGH RESOLUTION SERVO SYSTEMS

•

DIGITAL VOLTMETERS

•

HIGH PRECISION TEST and

MEASUREMENT INSTRUMENTS

DESCRIPTION

VRE105 Series Precision Voltage References

provide ultrastable +5.000 V (VRE105) and

±5.000 V (VRE107) outputs with ±0.4 mV initial

accuracy and temperature coefficient as low as

0.6 ppm/°C over the full military temperature

range. This impovement in accuracy is made

possible by a unique, proprietary 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

VRE105 series the most accurate and stable 5V

references available.

SELECTION GUIDE

Type

VRE105C

VRE105CA

VRE105M

VRE105MA

VRE107C

VRE107CA

VRE107M

VRE107MA

Output

+5V

±5V

Temperature

Max. Volt

Operating Range Deviation

-25°C to +85°C

0.4mV

-25°C to +85°C

0.2mV

-55°C to +125°C

0.6mV

-55°C to +125°C

0.3mV

-25°C to +85°C

-55°C to +125°C

0.4mV

0.2mV

0.6mV

0.3mV

VRE105 series devices are available in two operating temperature ranges, -25°C to +85°C and -55°C to

+125°C, and two performance grades. All devices are packaged in 14-pin hermetic ceramic packages for

maximum long-term stablity. "M" versions are screened for high reliability and quality.

Superior stability, accuracy, and quality make these references ideal for precision applications such as A/D

and D/A converters, high accuracy test and measurement instrumentation, and tranducer excitation.

VRE105DS REV. C SEPT 1994

4-32

ELECTRICAL SPECIFICATIONS

Vps =±15V, T = 25°C, RL = 10K

Ω

unless otherwise noted.

VRE105/107

CA

MIN

TYP MAX

MIN

MODEL

PARAMETERS

MIN

C

TYP MAX

M

MA

UNITS

TYP MAX MIN TYP MAX

ABSOLUTE MAXIMUM RATINGS

Power Supply

±13.5

±22

Operating Temperature -25

85

Storage Temperature

-65

150

Short Circuit Protection

Continuous

OUTPUT VOLTAGE

VRE105

VRE107

+5

±5

*

V

*

-55

*

125

*

-55

*

125

*

V

°C

OUTPUT VOLTAGE ERRORS

Initial Error

Warmup Drift

Tmin - Tmax

(1)

Long-Term Stability

Noise (.1-10Hz)

OUTPUT CURRENT

Range

REGULATION

Line

Load

OUTPUT ADJUSTMENT

Range

Temperature Coefficient

POWER SUPPLY CURRENTS

VRE105 +PS

VRE107 +PS

VRE107 -PS

NOTES:

*Same as C Models.

(2)

800

2

400

6

3

*

1

400

2

200

*

800

1

600

*

400

300

µV

ppm

µV

ppm/1000hr.

µVpp

±10

*

mA

6

3

10

*

ppm/V

ppm/mA

10

4

*

mV

µV/°C/mV

5

7

4

7

9

6

*

mA

1.Using the box method, the specified value is the

maximum deviation from the output voltage at 25°C

over the specified operating temperature range.

2.The specified values are unloaded.

VRE105DS REV. C SEPT 1994

4-32

TYPICAL PERFORMANCE CURVES

V

OUT

vs. TEMPERATURE

V

OUT

vs. TEMPERATURE

V

OUT

vs. TEMPERATURE

V

OUT

vs. TEMPERATURE

Temperature

o

C

VRE105/107C

Temperature

o

C

VRE105/107CA

Temperature

o

C

VRE105/107M

Temperature

o

C

VRE105/107MA

VRE105

QUIESCENT CURRENT VS. TEMP

JUNCTION TEMP. RISE VS. OUTPUT CURRENT

PSRR VS. FREQUENCY

Temperature

o

C

Output Current (mA)

Frequency (Hz)

VRE107

POSITIVE OUTPUT

QUIESCENT CURRENT VS. TEMP

JUNCTION TEMP. RISE VS. OUTPUT CURRENT

PSRR VS. FREQUENCY

Temperature

o

C

Output Current (mA)

NEGATIVE OUTPUT

Frequency (Hz)

QUIESCENT CURRENT VS. TEMP

JUNCTION TEMP. RISE VS. OUTPUT CURRENT

PSRR VS. FREQUENCY

Temperature

o

C

Output Current (mA)

Frequency (Hz)

VRE105DS REV. C SEPT.1994

4-34

DISCUSSION OF PERFORMANCE

THEORY OF OPERATION

The following discussion refers to the schematic

below. A FET current source is used to bias a 6.3V

zener diode. The zener voltage is divided by the

resistor network R1 and R2. This voltage is then

applied to the noninverting input of the operational

amplifier which amplifies the voltage to produce a

5.000V output. The gain is determined by the

resistor networks R3 and R4: G=1 + R4/R3. The

6.3V zener diode is used because it is the most

stable diode over time and temperature.

The current source provides a closely regulated

zener current, which determines the slope of the

reference's voltage vs. temperature function. By

trimming the zener current, a lower drift over

temperature can be achieved. But since the voltage

vs. temperature function is nonlinear, this method

leaves a residual error over wide temperature

ranges.

To remove this residual error, Thaler Corporation

has developed a nonlinear compensation network of

thermistors and resistors that is used in the VRE105

series references. This proprietary network

eliminates most of the nonlinearity in the voltage vs.

temperature function. By then adjusting the slope,

Thaler Corporation produces a very stable voltage

over wide temperature ranges. This network is less

than 2% of the overall network resistance so it has

a negligible effect on long term stability.

APPLICATION INFORMATION

Figure 1 shows the proper connection of the

VRE105 series voltage reference with the optional

trim resistors. When trimming the VRE107, the

positive voltage should be trimmed first since the

negative voltage tracks the positive side. Pay careful

attention to the circuit layout to avoid noise pickup

and voltage drops in the lines.

The VRE105 series voltage references have the

ground terminal brought out on two pins (pin 6 and

pin 7) which are connected together internally. This

allows the user to achieve greater accuracy when

using a socket. Voltage references have a voltage

drop across their power supply ground pin due to

quiescent current flowing through the contact

resistance. If the contact resistance was constant

with time and temperature, this voltage drop could be

trimmed out. When the reference is plugged into a

socket, this source of error can be as high as 20ppm.

By connecting pin 7 to the power supply ground and

pin 6 to a high impedance ground point in the

measurement circuit, the error due to the contact

resistance can be eliminated. If the unit is soldered

into place the contact resistance is sufficiently small

that it doesn't effect performance.

VRE105

VRE107

VRE105DS REV. C SEPT 1994

4-35

EXTERNAL CONNECTIONS

FIGURE 1

3. Optional Fine Adjust for approximately ±10mV.

PIN CONFIGURATION

TOP VIEW

NC

REF. GND

GND

FINE ADJ.

+5V

FINE ADJ.

FINE -ADJ.

-5V

FINE -ADJ.

-PS

NC

REF. GND

GND

TOP VIEW

FINE +ADJ.

+5V

FINE +ADJ.

VRE105

+PS

NC

VRE107

+PS

NC

MECHANICAL

14-PIN HYBRID

PACKAGE

INCHES

DIM

E

L

D

B

B1

B2

S

P

MIN

.480

.195

.775

.016

.038

.095

.085

.004

MAX

.500

.215

.805

.020

.042

.105

.006

MILLIMETER

MIN

12.1

4.9

19.7

0.4

0.9

2.4

2.1

0.10

MAX

12.7

5.4

20.4

0.5

1.0

2.6

0.15

DIM

A

Q

Q1

C

G1

INCHES

MIN

.120

.015

N/A

.009

.290

MAX

.155

.035

.030

.012

.310

MILLIMETER

MIN

3.0

0.4

N/A

0.2

7.3

MAX

4.0

0.9

0.7

0.3

7.8

VRE105DS REV. C SEPT 1994

4-36

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