AD420ANZ-32 Analog Devices Inc, AD420ANZ-32 Datasheet

AD420ANZ-32

Manufacturer Part Number

AD420ANZ-32

Description

IC DAC SRL 16BIT 24-DIP

Manufacturer

Analog Devices Inc

Datasheets

1.AD420ANZ-32.pdf (16 pages)

2.AD420ANZ-32.pdf (11 pages)

Specifications of AD420ANZ-32

Data Interface

Serial

Settling Time

2.5µs

Number Of Bits

Number Of Converters

Voltage Supply Source

Single Supply

Power Dissipation (max)

176mW

Operating Temperature

-40°C ~ 85°C

Mounting Type

Through Hole

Package / Case

24-DIP (0.300", 7.62mm)

Resolution (bits)

16bit

Sampling Rate

400SPS

Input Channel Type

Serial

Supply Current

4.2mA

Digital Ic Case Style

DIP

No. Of Pins

Lead Free Status / RoHS Status

Lead free / RoHS Compliant

Lead Free Status / RoHS Status

Lead free / RoHS Compliant, Lead free / RoHS Compliant

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PRODUCT DESCRIPTION

The AD420 is a complete digital to current loop output con-

verter, designed to meet the needs of the industrial control

market. It provides a high precision, fully integrated, low cost

single-chip solution for generating current loop signals in a

compact 24-lead SOIC or PDIP package.

The output current range can be programmed to 4 mA–20 mA,

0 mA–20 mA or an overrange function of 0 mA–24 mA. The

AD420 can alternatively provide a voltage output from a sepa-

rate pin that can be configured to provide 0 V–5 V, 0 V–10 V,

amplifier.

The 3.3M Baud serial input logic design minimizes the cost of

galvanic isolation and allows for simple connection to com-

monly used microprocessors. It can be used in three-wire or

asynchronous mode and a serial-out pin is provided to allow

daisy chaining of multiple DACs on the current loop side of the

isolation barrier.

The AD420 uses sigma-delta (

16-bit monotonicity at very low cost. Full-scale settling to 0.1%

occurs within 3 ms. The only external components that are re-

quired (in addition to normal transient protection circuitry) are

two low cost capacitors which are used in the DAC output filter.

If the AD420 is going to be used at extreme temperatures and

supply voltages, an external output transistor can be used to

minimize power dissipation on the chip via the “BOOST” pin.

The FAULT DETECT pin signals when an open circuit occurs

in the loop. The on-chip voltage reference can be used to supply

a precision +5 V to external components in addition to the

AD420 or, if the user desires temperature stability exceeding

25 ppm/ C, an external precision reference such as the AD586

can be used as the reference.

SPI is a registered trademark of Motorola.

MICROWIRE is a registered trademark of National Semiconductor.

REV. F

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

which may result from its use. No license is granted by implication or

otherwise under any patent or patent rights of Analog Devices.

5 V or 10 V with the addition of a single external buffer

FEATURES

4 mA–20 mA, 0 mA–20 mA or 0 mA–24 mA Current Output

16-Bit Resolution and Monotonicity

Flexible Serial Digital Interface (3.3 MBPS)

On-Chip Loop Fault Detection

On-Chip 5 V Reference (25 ppm/ C Max)

Asynchronous CLEAR Function

Maximum Power Supply Range of 32 V

Output Loop Compliance of 0 V to V

24-Lead SOIC and PDIP Packages

0.012% Max Integral Nonlinearity

0.05% Max Offset (Trimmable)

0.15% Max Total Output Error (Trimmable)

) DAC technology to achieve

– 2.5 V

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

Tel: 781/329-4700

Fax: 781/326-8703

The AD420 is available in a 24-lead SOIC and PDIP over the

industrial temperature range of –40 C to +85 C.

PRODUCT HIGHLIGHTS

1. The AD420 is a single chip solution for generating 4 mA–

2. The AD420 is specified with a power supply range

3. The flexible serial input can be used in three-wire mode

4. The serial data out pin can be used to daisy chain any num-

5. At power-up the AD420 initializes its output to the low end

6. The AD420 has an asynchronous CLEAR pin which sends

7. The AD420 BOOST pin accommodates an external transis-

8. The offset of 0.05% and total output error of 0.15% can

4 mA–20 mA, 0 mA–20 mA DAC

DATA OUT

SELECT 1

SELECT 2

REF OUT

DATA IN

20 mA or 0 mA–20 mA signals at the “controller end” of the

current loop.

from 12 V to 32 V. Output loop compliance is 0 V to

with SPI

chronous mode which minimizes the number of control

signals required.

ber of AD420s together in three-wire mode.

of the selected range.

the output to the low end of the selected range (0 mA,

4 mA, or 0 V).

tor to off-load power dissipation from the chip.

be trimmed if desired, using two external potentiometers.

CLEAR

CLOCK

RANGE

LATCH

REF IN

– 2.5 V.

FUNCTIONAL BLOCK DIAGRAM

DATA I/P

or MICROWIRE

World Wide Web Site: http://www.analog.com

REFERENCE

OFFSET

CLOCK

16-BIT

TRIM

DAC

AD420

Serial Input 16-Bit

CAP 1

SWITCHED

FILTERING

CURRENT

SOURCES

microcontrollers, or in asyn-

AND

CAP 2

GND

1.25k

AD420

BOOST

FAULT

DETECT

OUT

Related parts for AD420ANZ-32

AD420ANZ-32 Summary of contents

Page 1

FEATURES 4 mA–20 mA, 0 mA– mA–24 mA Current Output 16-Bit Resolution and Monotonicity 0.012% Max Integral Nonlinearity 0.05% Max Offset (Trimmable) 0.15% Max Total Output Error (Trimmable) Flexible Serial Digital Interface (3.3 MBPS) On-Chip Loop ...

Page 2

AD420–SPECIFICATIONS Parameter RESOLUTION I CHARACTERISTICS OUT Operating Current Ranges Current Loop Voltage Compliance 2 Settling Time (to 0.1% of FS) Output Impedance (Current Mode) 3 Accuracy Monotonicity Integral Nonlinearity Offset ( mA + ...

Page 3

ABSOLUTE MAXIMUM RATINGS GND CC AD420AR/AN- ...

Page 4

AD420 Timing Requirements (T = – + THREE-WIRE INTERFACE CLOCK WORD "N" DATA LATCH WORD "N – 1" DATA OUT t CK ...

Page 5

Pin # Symbol 1, 12, 13 FAULT DETECT 4 RANGE SELECT 2 5 RANGE SELECT 1 6 CLEAR 7 LATCH 8 CLOCK 9 DATA IN 10 DATA OUT 11 GND 14 REF OUT 15 ...

Page 6

AD420 THEORY OF OPERATION The AD420 uses a sigma-delta ( ) architecture to carry out the digital-to-analog conversion. This architecture is particularly well suited for the relatively low bandwidth requirements of the industrial control environment because of its inherent monoto- ...

Page 7

APPLICATIONS CURRENT OUTPUT The AD420 can provide 4 mA–20 mA, 0 mA–20 mA mA– output without any active external components. Filter capacitors C1 and C2 can be any type of low cost ceramic ca- pacitors. To ...

Page 8

AD420 THREE-WIRE INTERFACE Figure 8 shows the AD420 connected in the three-wire interface mode. The AD420 data input block contains a serial input shift register and a parallel latch. The contents of the shift register are controlled by the DATA ...

Page 9

MICROPROCESSOR INTERFACE SECTION AD420-TO-MC68HC11 (SPI BUS) INTERFACE The AD420 interface to the Motorola SPI (Serial Peripheral Interface) is shown in Figure 10. The MOSI, SCK, and SS pins of the HC11 are respectively connected to the DATA IN, CLOCK, and ...

Page 10

AD420 AD420 PROTECTION TRANSIENT VOLTAGE PROTECTION The AD420 contains ESD protection diodes which prevent damage from normal handling. The industrial control environ- ment can, however, subject I/O circuits to much higher tran- sients. In order to protect the AD420 from ...

Page 11

MAX 0.200 (5.05) 0.125 (3.18) 0.0118 (0.30) 0.0040 (0.10) REV. F OUTLINE DIMENSIONS Dimensions shown in inches and (mm). 24-Lead Plastic DIP (N-24) 1.275 (32.30) 1.125 (28.60 0.280 (7.11) 0.240 (6.10 0.060 (1.52) PIN ...

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