AD7538JRZ Analog Devices Inc, AD7538JRZ Datasheet

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AD7538JRZ

Manufacturer Part Number
AD7538JRZ
Description
DAC 1-CH R-2R 14-Bit 24-Pin SOIC W
Manufacturer
Analog Devices Inc
Datasheet

Specifications of AD7538JRZ

Package
24SOIC W
Resolution
14 Bit
Conversion Rate
667 KSPS
Architecture
R-2R
Digital Interface Type
Parallel
Number Of Outputs Per Chip
1
Output Type
Current
Full Scale Error
±8 LSB
Integral Nonlinearity Error
±2 LSB
Maximum Settling Time
1.5 us
Settling Time
1.5µs
Number Of Bits
14
Data Interface
Parallel
Number Of Converters
1
Voltage Supply Source
Single Supply
Power Dissipation (max)
1W
Operating Temperature
0°C ~ 70°C
Mounting Type
Surface Mount
Package / Case
24-SOIC (7.5mm Width)
Number Of Channels
1
Interface Type
Parallel
Single Supply Voltage (typ)
12/15V
Dual Supply Voltage (typ)
Not RequiredV
Power Supply Requirement
Single
Single Supply Voltage (min)
11.4V
Single Supply Voltage (max)
15.75V
Dual Supply Voltage (min)
Not RequiredV
Dual Supply Voltage (max)
Not RequiredV
Operating Temp Range
0C to 70C
Operating Temperature Classification
Commercial
Mounting
Surface Mount
Pin Count
24
Package Type
SOIC W
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Lead Free Status / RoHS Status
Lead free / RoHS Compliant

Available stocks

Company
Part Number
Manufacturer
Quantity
Price
Part Number:
AD7538JRZ
Manufacturer:
ADI/亚德诺
Quantity:
20 000
FEATURES
All grades 14-bit monotonic over the full temperature range
Low cost, 14-bit upgrade for 12-bit systems
14-bit parallel load with double buffered inputs
Small 24-pin, 0.30” DIP and SOIC
Low output leakage (<20 nA) over the full temperature range
APPLICATIONS
Microprocessor-based control systems
Digital audio
Precision servo control
Control and measurement in high temperature environments
GENERAL DESCRIPTION
The AD7538 is a 14-bit monolithic CMOS digital-to-analog
converter (DAC) that uses laser trimmed thin-film resistors to
achieve excellent linearity.
The DAC is loaded by a single 14-bit wide word using standard
chip select and memory write logic. Double buffering, which is
optional using LDAC , allows simultaneous updates in a system
containing multiple AD7538s.
A novel low leakage configuration (U.S. Patent No. 4,590,456)
enables the AD7538 to exhibit excellent output leakage current
characteristics over the specified temperature range.
The AD7538 is manufactured using the linear-compatible
CMOS (LC
microprocessors and accepts TTL or CMOS logic level inputs.
Rev. B
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.
2
MOS) process. It is speed compatible with most
Microprocessor-Compatible 14-Bit DAC
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
Fax: 781.461.3113
PRODUCT HIGHLIGHTS
1.
2.
3.
4.
5.
Guaranteed Monotonicity.
The AD7538 is guaranteed monotonic to 14-bits over the
full temperature range for all grades.
Low Cost.
The AD7538, with its 14-bit dynamic range, affords a low
cost solution for 12-bit system upgrades.
Small Package Size.
The AD7538 is packaged in a small 24-pin, 0.3" DIP and a
24-pin SOIC.
Low Output Leakage.
By tying V
achieve a low output leakage current at high temperatures.
Wide Power Supply Tolerance.
The device operates on a +12 V to +15 V V
tolerance on this nominal figure. All specifications are
guaranteed over this range.
V
REF
FUNCTIONAL BLOCK DIAGRAM
1
SS
(Pin 24) to a negative voltage, it is possible to
DAC REGISTER
DB13 TO DB0
14-BIT DAC
REGISTER
AD7538
6
INPUT
©2009 Analog Devices, Inc. All rights reserved.
14
19
Figure 1.
DGND
V
23
DD
5
V
24
SS
20
21
22
AD7538
2
3
4
www.analog.com
DD
LC
R
I
AGND
LDAC
CS
WR
OUT
, with a ±5%
FB
2
MOS

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AD7538JRZ Summary of contents

Page 1

FEATURES All grades 14-bit monotonic over the full temperature range Low cost, 14-bit upgrade for 12-bit systems 14-bit parallel load with double buffered inputs Small 24-pin, 0.30” DIP and SOIC Low output leakage (<20 nA) over the full temperature range ...

Page 2

AD7538 TABLE OF CONTENTS Features .............................................................................................. 1 Applications ....................................................................................... 1 Functional Block Diagram .............................................................. 1 General Description ......................................................................... 1 Product Highlights ........................................................................... 1 Revision History ............................................................................... 2 Specifications ..................................................................................... 3 AC Performance Characteristics ................................................ 4 Timing Characteristics ................................................................ 4 Timing ...

Page 3

SPECIFICATIONS 11 15. REF Table Parameter Versions ACCURACY Resolution 14 Relative Accuracy ±2 Differential Nonlinearity ±1 Full-Scale Error +25°C ± ...

Page 4

AD7538 AC PERFORMANCE CHARACTERISTICS These characteristics are included for design guidance only and are not subject to test −300 mV, output amplifier is SS Table Parameter T A Output ...

Page 5

TIMING DIAGRAM LDAC DATA NOTES 1. ALL INPUT SIGNAL RISE AND FALL TIMES MEASURES FROM 10 90 20ns ...

Page 6

AD7538 ABSOLUTE MAXIMUM RATINGS T = +25°C unless, otherwise stated. A Table 4. Parameter V (Pin 23) to DGND DD V (Pin 24) to AGND SS V (Pin 1) to AGND REF V (Pin 2) to AGND RFB Digital Input ...

Page 7

PIN CONFIGURATION AND FUNCTION DESCRIPTIONS Table 5. Pin Function Description Pin No. Mnemonic Description 1 V Voltage Reference. REF 2 R Feedback Resistor. Used to close the loop around an external op amp Current Output Terminal. OUT ...

Page 8

AD7538 TERMINOLOGY Relative Accuracy Relative accuracy or endpoint nonlinearity is a measure of the maximum deviation from a straight line passing through the endpoints of the DAC transfer function measured after adjusting for zero error and full-scale error ...

Page 9

DAC SECTION Figure 4 shows a simplified circuit diagram for the AD7538 DAC section. The three MSBs of the 14-bit data word are decoded to drive the seven switches (A to G). The 11 LSBs of the data word consist ...

Page 10

AD7538 CIRCUIT INFORMATION EQUIVALENT CIRCUIT ANALYSIS Figure 5 shows an equivalent circuit for the analog section of the AD7538 DAC. The current source I of surface and junction leakages. The R equivalent output resistance of the DAC, which varies with ...

Page 11

BIPOLAR OPERATION (4-QUADRANT MULTIPLICATION) The recommended circuit diagram for bipolar operation is shown in Figure 8. Offset binary coding is used. The code table for Figure 8 is given in Table 7. With the DAC loaded to 10 0000 0000 ...

Page 12

AD7538 PROGRAMMABLE GAIN AMPLIFIER The circuit shown in Figure 9 provides a programmable gain amplifier (PGA the DAC behaves as a programmable resistance and thus allows the circuit gain to be digitally controlled. DIGITAL INPUT ...

Page 13

APPLICATION HINTS OUTPUT OFFSET CMOS DACs in circuits such as Figure 6 and Figure 8 exhibit a code dependent output resistance, which in turn can cause a code dependent error voltage at the output of the amplifier. The maximum amplitude ...

Page 14

AD7538 DIGITAL FEEDTHROUGH The digital inputs to the AD7538 are directly connected to the microprocessor bus in the preceding interface configurations. These inputs are constantly changing even when the device is not selected. The high frequency logic activity on the ...

Page 15

OUTLINE DIMENSIONS 24 1 0.210 (5.33) MAX 0.150 (3.81) 0.130 (3.30) 0.115 (2.92) 0.022 (0.56) 0.018 (0.46) 0.014 (0.36) CONTROLLING DIMENSIONS ARE IN INCHES; MILLIMETER DIMENSIONS (IN PARENTHESES) ARE ROUNDED-OFF INCH EQUIVALENTS FOR REFERENCE ONLY AND ARE NOT APPROPRIATE FOR ...

Page 16

... AD7538KNZ 0°C to +70°C AD7538JR 0°C to +70°C AD7538JR-REEL 0°C to +70°C AD7538JRZ 1 0°C to +70°C 1 AD7538JRZ-REEL 0°C to +70°C AD7538KR 0°C to +70°C AD7538KR-REEL 0°C to +70°C 1 AD7538KRZ 0°C to +70°C 1 AD7538KRZ-REEL 0°C to +70°C AD7538AQ − ...

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