AD780AR-REEL7 Analog Devices Inc, AD780AR-REEL7 Datasheet

AD780AR-REEL7

Manufacturer Part Number

AD780AR-REEL7

Description

IC,VOLT REFERENCE,PIN-PROGRAMMABLE,2.5V/3V,BIPOLAR,SOP,8PIN,PLASTIC

Manufacturer

Analog Devices Inc

Datasheet

1.AD780ARZ.pdf (12 pages)

Specifications of AD780AR-REEL7

Rohs Status

RoHS non-compliant

Design Resources

Using AD8599 as an Ultralow Distortion Driver for the AD7991 (CN0043) Using AD8599 as an Ultralow Distortion Driver for the AD7995 (CN0044) Using AD8599 as an Ultralow Distortion Driver for the AD7999 (CN0045) Using AD7328 in Appls with Single-Ended Industrial-Level Signals (CN0047) AD5382 Channel Monitor Function (CN0012) AD5383 Channel Monitor Function (CN0015) AD5390/91/92 Channel Monitor Function (CN0030) Measuring -48 V High-Side Current Using AD629, AD8603, AD780, and AD7453 (CN0100) High Voltage, High Precision Current Sensing with Output Level Shifting Using AD8210 and AD8274 (CN0116)

Reference Type

Series and Shunt, Programmable

Voltage - Output

2.5V, 3V

Tolerance

±5mV

Temperature Coefficient

7ppm/°C

Voltage - Input

4 ~ 36 V

Number Of Channels

Current - Quiescent

1mA

Current - Output

10mA

Operating Temperature

-40°C ~ 85°C

Mounting Type

Surface Mount

Package / Case

8-SOIC (3.9mm Width)

Current - Cathode

Lead Free Status / RoHS Status

Other names

AD780AR-REEL7TR

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FEATURES

Pin programmable 2.5 V or 3.0 V output

Ultralow drift: 3 ppm/°C max

High accuracy: 2.5 V or 3.0 V ±1 mV max

Low noise: 100 nV/√Hz

Noise reduction capability

Low quiescent current: 1 mA max

Output trim capability

Plug-in upgrade for present references

Temperature output pin

Series or shunt mode operation (±2.5 V, ±3.0 V)

PRODUCT DESCRIPTION

The AD780 is an ultrahigh precision band gap reference voltage

that provides a 2.5 V or 3.0 V output from inputs between 4.0 V

and 36 V. Low initial error and temperature drift combined with

low output noise and the ability to drive any value of

capacitance make the AD780 the ideal choice for enhancing the

performance of high resolution ADCs and DACs, and for any

general-purpose precision reference application. A unique low

headroom design facilitates a 3.0 V output from a 5.0 V 10%

input, providing a 20% boost to the dynamic range of an ADC

over performance with existing 2.5 V references.

The AD780 can be used to source or sink up to 10 mA, and can

be used in series or shunt mode, thus allowing positive or

negative output voltages without external components. This

makes it suitable for virtually any high performance reference

application. Unlike some competing references, the AD780 has

no region of possible instability. The part is stable under all load

conditions when a 1 µF bypass capacitor is used on the supply.

A temperature output pin on the AD780 provides an output

voltage that varies linearly with temperature, allowing the part

to be configured as a temperature transducer while providing a

stable 2.5 V or 3.0 V output.

Rev. E

Information furnished by Analog Devices is believed to be accurate and reliable.

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.

The AD780 is a pin compatible performance upgrade for the

LT1019(A)–2.5 and the AD680. The latter is targeted toward

low power applications.

The AD780 is available in three grades in PDIP and SOIC

packages. The AD780AN, AD780AR, AD780BN, AD780BR, and

AD780CR are specified for operation from −40°C to +85°C.

PRODUCT HIGHLIGHTS

1. The AD780 provides a pin programmable 2.5 V or 3.0 V

2. Laser trimming of both initial accuracy and temperature

3. For applications that require even higher accuracy, an

4. The AD780 noise is extremely low, typically 4 mV p-p from

5. The temperature output pin enables the AD780 to be

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.

Tel: 781.329.4700

Fax: 781.326.8703

output from a 4 V to 36 V input.

coefficients results in low errors over temperature without

the use of external components. The AD780BN has a

maximum variation of 0.9 mV from −40°C to +85°C.

optional fine-trim connection is provided.

0.1 Hz to 10 Hz and a wideband spectral noise density of

typically 100 nV/√ Hz . This can be further reduced, if

desired, by using two external capacitors.

configured as a temperature transducer while providing a

stable output reference.

TEMP

NC = NO CONNECT

High Precision Reference

FUNCTIONAL BLOCK DIAGRAM

AD780

R10

GND

R11

Figure 1.

R14

O/P SELECT

2.5V – NC

3.0V – GND

2.5 V/3.0 V

R13

R15

R16

www.analog.com

AD780

TRIM

OUT

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AD780AR-REEL7 Summary of contents

Page 1

... LT1019(A)–2.5 and the AD680. The latter is targeted toward low power applications. The AD780 is available in three grades in PDIP and SOIC packages. The AD780AN, AD780AR, AD780BN, AD780BR, and AD780CR are specified for operation from −40°C to +85°C. PRODUCT HIGHLIGHTS 1. The AD780 provides a pin programmable 2 3.0 V output from input ...

Page 2

AD780 T ABLE OF CONTENTS Specifications................................. .................................................... 3 Absolute Maximum Ratings............................................................ 4 Notes............................................................................................... 4 ESD Caution.................................................................................. 4 Th eory of Operation ........................................................................ 5 Applying the AD780......................................................................... 6 Noise Performance ....................................................................... 6 Noise Comparison........................................................................ 7 Temperature Performance........................................................... 7 Temperature Output Pin ...

Page 3

... The long-term stability specification is noncumulative. The drift in subsequent 1,000 hour periods is significantly lower than in the first 1,000 hour period. 4 The operating temperature range is defined as the temperature extremes at which the device will still function. Parts may deviate from their specified performance outside their specified temperature range. AD780AN/AD780AR AD780CR Min Typ ...

Page 4

AD780 ABSOLUTE MAXIMUM RATINGS Table 2. Parameter Values +V to Ground TRIM Pin to Ground 36 V TEMP Pin to Ground 36 V Power Dissipation (25°C) 500 mW Storage Temperature −65°C to +150°C Lead Temperature 300°C (Soldering ...

Page 5

THEORY OF OPERATION Band gap references are the high performance solution for low supply voltage and low power voltage reference applications. In this technique, a voltage with a positive temperature coefficient is combined with the negative coefficient of a transistor’s ...

Page 6

AD780 APPLYING THE AD780 The AD780 can be used without any external components to achieve specified performance. If power is supplied to Pin 2 and Pin 4 is grounded, Pin 6 provides a 2 3.0 V output depending ...

Page 7

OUT NC 1 AD780 1µF TRIM TEMP 3 O/P SELECT 2.5V – 3.0V – GND GND CONNECT Figure 9. Noise Reduction Circuit NOISE COMPARISON The wideband noise ...

Page 8

AD780 Notice how sensitive the current dependent factor on V large amount of current, even in tens of microamp, drawn from the TEMP pin can cause the V and TEMP output to fail. OUT The choice of C1 and C2 ...

Page 9

IN 2 AD780 6 1µ Figure 16. Transient Resistive Load Test Circuit I LOAD 0mA 10mA 0pF) OUT L 10µs/DIV Figure 17. Settling under Transient Resistive Load The dynamic load may be resistive ...

Page 10

AD780 OUT 1µF AD780 2.5V/3.0V GND SELECT 4 8 Figure 21. Precision 3 V Reference for the AD7884 16-Bit, High Speed ADC The AD780 is also ideal for use with higher resolution converters, such ...

Page 11

OUTLINE DIMENSIONS 5.00 (0.1968) 4.80 (0.1890 6.20 (0.2440) 4.00 (0.1574) 5.80 (0.2284) 3.80 (0.1497 1.27 (0.0500) BSC 1.75 (0.0688) 1.35 (0.0532) 0.25 (0.0098) 0.10 (0.0040) 0.51 (0.0201) COPLANARITY 0.25 (0.0098) 0.31 (0.0122) SEATING 0.10 0.17 (0.0067) ...

Page 12

... AD780 ORDERING GUIDE Model Initial Error Temperature Range AD780AN ±5.0 mV −40°C to +85°C AD780AR ±5.0 mV −40°C to +85°C AD780AR-REEL7 ±5.0 mV −40°C to +85°C 1 AD780ARZ ±5.0 mV −40°C to +85°C AD780BN ±1.0 mV −40°C to +85°C AD780BR ±1.0 mV −40°C to +85°C ...

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