PPC405EX-SPC600T - APPLIED MICRO CIRCUITS CORPORATION

High Precision,

2.5 V IC Reference

AD580

Rev. B

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However, no responsibility is assumed by Analog Devices for its use, nor for any

infringements of patents or other rights of third parties that may result from its use.

Specifications subject to change without notice. No license is granted by implication

or otherwise under any patent or patent rights of Analog Devices. Trademarks and

registered trademarks are the property of their respective owners.

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Tel: 781.329.4700 www.analog.com

FEATURES

Laser-trimmed to high accuracy: 2.500 V ±0.4%

3-terminal device: voltage in/voltage out

Excellent temperature stability: 10 ppm/°C (AD580M, U)

Excellent long-term stability: 250 μV (25 μV/month)

Low quiescent current: 1.5 mA maximum

Small, hermetic IC package: TO-52 can

MIL-STD-883 compliant versions available

FUNCTIONAL BLOCK DIAGRAM

–E

EOUT

00525-B-001

BOTTOM

VIEW

Figure 1.

GENERAL DESCRIPTION

The AD580 is a 3-terminal, low cost, temperature-compensated,

bandgap voltage reference, which provides a fixed 2.5 V output

for inputs between 4.5 V and 30 V. A unique combination of

advanced circuit design and laser-wafer trimmed thin film

resistors provide the AD580 with an initial tolerance of ±0.4%, a

temperature stability of better than 10 ppm/°C, and long-term

stability of better than 250 μV. In addition, the low quiescent

current drain of 1.5 mA maximum offers a clear advantage over

classical Zener techniques.

The AD580 is recommended as a stable reference for all 8-, 10-,

and 12-bit D/A converters that require an external reference. In

addition, the wide input range of the AD580 allows operation

with 5 volt logic supplies, making the AD580 ideal for digital

panel meter applications or whenever only a single logic power

supply is available.

The AD580J, K, L, and M are specified for operation over the

0°C to +70°C temperature range; the AD580S, T, and U are

specified for operation over the extended temperature range of

–55°C to +125°C.

PRODUCT HIGHLIGHTS

1. Laser-trimming of the thin film resistors minimizes the

AD580 output error. For example, the AD580L output

tolerance is ±10 mV.

2. The three-terminal voltage in/voltage out operation of the

AD580 provides regulated output voltage without any

external components.

3. The AD580 provides a stable 2.5 V output voltage for input

voltages between 4.5 V and 30 V. The capability to provide

a stable output voltage using a 5 V input makes the AD580

an ideal choice for systems that contain a single logic

power supply.

4. Thin film resistor technology and tightly controlled bipolar

processing provide the AD580 with temperature stabilities

to 10 ppm/°C and long-term stability better than 250 μV.

5. The low quiescent current drain of the AD580 makes it

ideal for CMOS and other low power applications.

6. The AD580 is available in versions compliant with MIL-

STD-883. Refer to the Analog Devices Military Products

Data Book or the current AD580/AD883B data sheet for

detailed specifications.

AD580

Rev. B | Page 2 of 8

TABLE OF CONTENTS

Specifications..................................................................................... 3

Absolute Maximum Ratings............................................................ 4

AD580 Chip Dimensions And Pad Layout............................... 4

ESD Caution.................................................................................. 4

Theory of Operation ........................................................................ 5

Voltage Variation versus Temperature ....................................... 5

Noise Performance ....................................................................... 6

The AD580 as a Current Limiter.................................................6

The AD580 as a Low Power, Low Voltage, Precision Reference

for Data Converters.......................................................................7

Outline Dimensions..........................................................................8

Ordering Guide .............................................................................8

REVISION HISTORY

8/04—Changed from Rev. A to Rev. B

Updated Format................................................................Universal

AD580

Rev. B | Page 3 of 8

SPECIFICATIONS

Table 1. VIN = 15 V and 25°C

AD580J AD580K AD580L AD580M

Model Min Typ Max Min Typ Max Min Typ Max Min Typ Max Units

OUTPUT VOLTAGE TOLERANCE

Error from Nominal 2.500 V Output ±75 ±25 ±10 ±10 mV

OUTPUT VOLTAGE CHANGE

TMIN to TMAX 15 7 4.3 1.75 mV

85 40 25 10 ppm/°C

LINE REGULATION

7 V ≤ VIN ≤ 30 V 1.5 61 1.5

4 2 2 mV

4.5 V ≤ VIN ≤ 7 V 0.3 3 0.3

2 1 1 mV

LOAD REGULATION

∆I = 10 mA 10 10 10 10 mV

QUIESCENT CURRENT 1.0 1.5 1.0

1.5 1.0

1.5 mA

NOISE (0.1 Hz to 10 Hz) 8 8 8 8 µV p-p

STABILITY

Long Term 250 250 250 250 µV

Per Month 25 25 25 25 µV

TEMPERATURE PERFORMANCE

Specified 0 +70 0 +70 0 +70 0 +70 °C

Operating –55 +125 –55 +125 –55 +125 –55 +125 °C

Storage –65 +175 –65 +175 –65 +175 –65 +175 °C

PACKAGE OPTION2 TO-52 (H-03A) AD580JH AD580KH AD580LH AD580MH

Table 2.

AD580S AD580T AD580U

Model Min Typ Max Min Typ Max Min Typ Max Units

OUTPUT VOLTAGE TOLERANCE

Error from Nominal 2.500 V Output ±251 ±10 ±10 mV

OUTPUT VOLTAGE CHANGE

TMIN to TMAX 25 11 4.5 mV

55 25 10 ppm/°C

LINE REGULATION

7 V ≤ VIN ≤ 30 V 1.5 6 2 2 mV

4.5 V ≤ VIN ≤ 7 V 0.3 3 1 1 mV

LOAD REGULATION

∆I = 10 mA 10 10 10 mV

QUIESCENT CURRENT 1.0 1.5 1.0

1.5 1.0

1.5 mA

NOISE (0.1 Hz to 10 Hz) 8 8 8 µV p-p

STABILITY

Long Term 250 250 250 µV

Per Month 25 25 25 µV

TEMPERATURE PERFORMANCE

Specified –55 +125 –55 +125 –55 +125 °C

Operating –55 +150 –55 +150 –55 +150 °C

Storage –65 +175 –65 +175 –65 +175 °C

PACKAGE OPTION2 TO-52 (H-03A) AD580SH AD580TH AD580UH

1 Specifications shown in boldface are tested on all production units at final electrical test. Results from those tests are used to calculate outgoing quality levels. All min

and max specifications are guaranteed, although only those shown in boldface are tested on all production units.

2 H = Metal Can.

AD580

Rev. B | Page 4 of 8

ABSOLUTE MAXIMUM RATINGS

Table 3.

Parameter Rating

Input Voltage 40 V

Power Dissipation @ 25°C

Ambient Temperature 350 mW

Derate above 25°C 2.8 mW/°C

Lead Temperature (Soldering

10 sec)

300°C

Thermal Resistance

Junction-to-Case 100°C

Junction-to-Ambient 360°C/W

Stresses above those listed under Absolute Maximum Ratings

may cause permanent damage to the device. This is a stress

rating only; functional operation of the device at these or any

other conditions above those listed in the operational sections

of this specification is not implied. Exposure to absolute

maximum rating conditions for extended periods may affect

device reliability.

AD580 CHIP DIMENSIONS AND PAD LAYOUT

Dimensions shown in inches and (millimeters).

00525-B-002

*BOTH E

OUT

PADS MUST BE CONNECTED TO THE OUTPUT.

0.075 (1.90)

OUT

*–E

0.046

(1.16)

Figure 2.

The AD580 is also available in chip form. Consult the factory

for specifications and applications information.

ESD CAUTION

ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily accumulate on

the human body and test equipment and can discharge without detection. Although this product features

proprietary ESD protection circuitry, permanent damage may occur on devices subjected to high energy

electrostatic discharges. Therefore, proper ESD precautions are recommended to avoid performance

degradation or loss of functionality.

AD580

Rev. B | Page 5 of 8

THEORY OF OPERATION

The AD580 family (AD580, AD581, AD584, AD589) uses the

bandgap concept to produce a stable, low temperature coef-

ficient voltage reference suitable for high accuracy data acqui-

sition components and systems. The device makes use of the

underlying physical nature of a silicon transistor base-emitter

voltage in the forward-biased operating region. All such tran-

sistors have approximately a –2 mV/°C temperature coefficient,

unsuitable for use directly as a low TC reference. Extrapolation

of the temperature characteristic of any one of these devices to

absolute zero (with an emitter current propor-tional to the

absolute temperature), however, reveals that it will go to a VBE of

1.205 V at 0 K, as shown in Figure 3. Thus, if a voltage could be

developed with an opposing temperature coefficient to sum

with VBE to total 1.205 V, a 0 TC reference would result and

operation from a single, low voltage supply would be possible.

The AD580 circuit provides such a compensating voltage, V1 in

Figure 4, by driving two transistors at different current densities

and amplifying the resulting VBE difference (∆VBE—which now

has a positive TC). The sum, VZ, is then buffered and amplified

up to 2.5 V to provide a usable reference-voltage output. Figure

5 shows the schematic diagram of the AD580.

The AD580 operates as a 3-terminal reference, meaning that no

additional components are required for biasing or current

setting. The connection diagram, Figure 6, is quite simple.

1.5

1.0

1.205

0.5

–273°C –200°C –100°C 100°C0°C

0K 73K 173K 373K273K

00525-B-003

TEMPERATURE

JUNCTION VOLTAGE (V)

FOR BOTH

DEVICES

REQUIRED

COMPENSATION

VOLTAGE–

SAME DEVICES

VS. TEMPERATURE

FOR TWO TYPICAL

DEVICES (I

CONSTANT SUM = 1.205V

Figure 3. Extrapolated Variation of Base-Emitter Voltage with Temperature

(IEαT), and Required Compensation, Shown for Two Different Devices

00525-B-004

R7R8

≅

= I

+ I

COM

8A Q1

= 2

∆

(Q1)

OUT

= V

1 + = 2.5V

= V

+ 2

∆

= V

+ 2 ln

= 1.205V

= V

+ V

Figure 4. Basic Bandgap-Reference Regulator Circuit

00525-B-005

COM

R12 R13

Q14

Q13

Q10 Q11 Q12

Q15 Q5

Q8 Q9

8A Q1

R11 R5

R10

–E

2.5V

OUT

Figure 5. Schematic Diagram

00525-B-006

4.5

≤

VIN

≤

30V

–E

EOUT

LOAD

AD580

Figure 6. Connection Diagram

VOLTAGE VARIATION VERSUS TEMPERATURE

Some confusion exists in the area of defining and specifying

reference voltage error over temperature. Historically, references

are characterized using a maximum deviation per degree

Centigrade; i.e., 10 ppm/°C. However, because of the

inconsistent nonlinearities in Zener references (butterfly or S

type characteristics), most manufacturers use a maximum limit

error band approach to characterize their references. This

technique measures the output voltage at 3 to 5 different

temperatures and guarantees that the output voltage deviation

will fall within the guaranteed error band at these discrete

temperatures. This approach, of course, makes no mention or

guarantee of performance at any other temperature within the

operating temperature range of the device.

AD580

Rev. B | Page 6 of 8

The consistent voltage versus temperature performance of a

typical AD580 is shown in Figure 7. Note that the characteristic

is quasi-parabolic, not the possible S type characteristics of

classical Zener references. This parabolic characteristic permits

a maximum output deviation specification over the device’s full

operating temperature range, rather than just at 3 to 5 discrete

temperatures.

2.51

2.50

2.49

2.48

2.47

2.46

–55 –30 0 25 50 75 100 125

00525-B-007

TEMPERATURE (°C)

OUTPUT VOLTAGE (V)

MAXIMUM

VOLTAGE CHANGE

FROM 0°C TO 70°C

Figure 7. Typical AD580K Output Voltage vs. Temperature

The AD580M guarantees a maximum deviation of 1.75 mV

over the 0°C to 70°C temperature range. This can be shown to

be equivalent to 10 ppm/°C average maximum; i.e.,

averageCppm

max/10

5.2

75.1 °=×

The AD580 typically exhibits a variation of 1.5 mV over the

power supply range of 7 V to 30 V. Figure 8 is a plot of AD580

line rejection versus frequency.

NOISE PERFORMANCE

Figure 9 represents the peak-to-peak noise of the AD580 from

1 Hz (3 dB point) to a 3 dB high end shown on the horizontal

axis. Peak-to-peak noise from 1 Hz to 1 MHz is approximately

600 µV.

140

130

100

110

120

10 100 1k 10k 100k

00525-B-008

LINE FREQUENCY (Hz)

OUT

, p-p (mV)

AD580

k e OUT p-p

e = 23V p-p

E = 18.5V

E IN COMPOSITE (17V

≤

30V)

Figure 8. AD580 Line Rejection Plot

1mV

100µV

10µV

100 1k 10k 100k 1M

00525-B-009

FREQUENCY (Hz)

PEAK-TO-PEAK NOISE

Figure 9. Peak-to-Peak Output Noise vs. Frequency

00525-B-010

500µA

Figure 10. Input Current vs. Input Voltage (Integral Loads)

THE AD580 AS A CURRENT LIMITER

The AD580 represents an excellent alternative to current limiter

diodes that require factory selection to achieve a desired

current. This approach often results in temperature coefficients

of 1%/C. The AD580 approach is not limited to a specially

selected factory set current limit; it can be programmed from

1 mA to 10 mA with the insertion of a single external resistor.

The approximate temperature coefficient of current limit for the

AD580 used in this mode is 0.13%/°C for ILIM = 1 mA and

0.01%/°C for ILIM = 13 mA (see Figure 11). Figure 10 displays

the high output impedance of the AD580 used as a current

limiter for ILIM = 1, 2, 3, 4, and 5 mA.

00525-B-011

BOTTOM VIEW OF

2.5V PRECISION

REFERENCE CIRCUIT

IN TO-52 CASE

AD580

V+

V–

OUTPUT

LOAD

2.5V 2.5V

≅

+ 1mA

Figure 11. A Two-Component Precision Current Limiter

AD580

Rev. B | Page 7 of 8

THE AD580 AS A LOW POWER, LOW VOLTAGE,

PRECISION REFERENCE FOR DATA CONVERTERS

The AD580 has a number of features that make it ideally suited

for use with A/D and D/A data converters used in complex

microprocessor-based systems. The calibrated 2.500 V output

minimizes user trim requirements and allows operation from a

single, low voltage supply. Low power consumption (1 mA

quiescent current) is commensurate with that of CMOS-type

devices, while the low cost and small package complements the

decreasing cost and size of the latest converters.

Figure 12 shows the AD580 used as a reference for the AD7542

12-bit CMOS DAC with complete microprocessor interface.

The AD580 and the AD7542 are specified to operate from a

single 5 V supply, thus eliminating the need to provide a 15 V

power supply for the sole purpose of operating a reference. The

AD7542 includes three 4-bit data registers, a 12-bit DAC

directly to a 4-, 8- or 16-bit data bus. Only 8 mA of quiescent

current from the single 5 volt supply is required to operate the

AD7542 which is packaged in a small, 16-pin DIP. The AD544

output amplifier is also low power, requiring only 2.5 mA

quiescent current. Its laser-trimmed offset voltage preserves the

±1/2 LSB linearity of the AD7542KN without user trims, and it

typically settles to ±1/2 LSB in less than 3 µs. It will provide the

0 V to –2.5 V output swing from ±5 V supplies.

00525-B-012

AD7542

CLR

FROM SYSTEM RESET

FROM ADDRESS BUS

FROM WR

812 3

1514 16

FROM ADDRESS DECODER

AD7 AD0

SYSTEM

8-BIT DATA BUS

AD544L

DGND

–5V

ANALOG

INPUT

AGND

OUT2

OUT1

RFB

REF

22pF

200Ω

500ΩGAIN

ADJUST

OUT

+5V

–E

AD580

Figure 12. Low Power, Low Voltage Reference for the AD7542

Microprocessor-Compatible, 12-Bit DAC

AD580

Rev. B | Page 8 of 8

OUTLINE DIMENSIONS

CONTROLLING DIMENSIONS ARE IN INCHES; MILLIMETERS DIMENSIONS

(IN PARENTHESES) ARE ROUNDED-OFF INCH EQUIVALENTS FOR

REFERENCE ONLY AND ARE NOT APPROPRIATE FOR USE IN DESIGN

0.250 (6.35) MIN

0.150 (3.81)

0.115 (2.92)

0.050 (1.27) MAX

0.019 (0.48)

0.016 (0.41)

0.021 (0.53) MAX

0.030 (0.76) MAX

BASE & SEATING PLANE

0.195 (4.95)

0.178 (4.52)

0.230 (5.84)

0.209 (5.31)

0.500 (12.70)

MIN

0.046 (1.17)

0.036 (0.91)

0.048 (1.22)

0.028 (0.71)

0.050 (1.27) T.P.

0.100

(2.54)

T.P.

0.050

(1.27)

T.P. 45° T.P.

Figure 13. TO–52 Package

Dimensions shown in inches and (millimeters)

ORDERING GUIDE

Model

Output Voltage

Tolerance

Temperature

Coefficient

Operating

Temperature Range Package Option

Package

Description

AD580JH ±75 mV 85 ppm/°C –55°C to +125°C TO–52 H (Metal Can)

AD580KH ±25 mV 40 ppm/°C –55°C to +125°C TO–52 H (Metal Can)

AD580LH ±10 mV 25 ppm/°C –55°C to +125°C TO–52 H (Metal Can)

AD580LMH ±10 mV 10 ppm/°C –55°C to +125°C TO–52 H (Metal Can)

AD580SH ±25 mV 55 ppm/°C –55°C to +125°C TO–52 H (Metal Can)

AD580SH/883B ±25 mV 55 ppm/°C –55°C to +125°C TO–52 H (Metal Can)

AD580TH ±10 mV 25 ppm/°C –55°C to +125°C TO–52 H (Metal Can)

AD580UH ±10 mV 10 ppm/°C –55°C to +125°C TO–52 H (Metal Can)

AD580UH/883B ±10 mV 10 ppm/°C –55°C to +125°C TO–52 H (Metal Can)

AD580TCHIPS ±10 mV DIE

registered trademarks are the property of their respective owners.

C00525-0-8/04(B)