dac8408ft Analog Devices, Inc., dac8408ft Datasheet

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dac8408ft

Manufacturer Part Number
dac8408ft
Description
Quad 8-bit Multiplying Cmos D/a Converter With Memory
Manufacturer
Analog Devices, Inc.
Datasheet
a
REV. A
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.
GENERAL DESCRIPTION
The DAC8408 is a monolithic quad 8-bit multiplying digital-to-
analog CMOS converter. Each DAC has its own reference input,
feedback resistor, and onboard data latches that feature
read/write capability. The readback function serves as memory
for those systems requiring self-diagnostics.
FEATURES
Four DACs in a 28 Pin, 0.6 Inch Wide DIP or 28-Pin JEDEC
Guaranteed Monotonic
DACs Matched to Within 1%
Microprocessor Compatible
Read/Write Capability (with Memory)
TTL/CMOS Compatible
Four-Quadrant Multiplication
Single-Supply Operation (+5 V)
Low Power Consumption
Latch-Up Resistant
Available In Die Form
APPLICATIONS
Voltage Set Points in Automatic Test Equipment
Systems Requiring Data Access for Self-Diagnostics
Industrial Automation
Multichannel Microprocessor-Controlled Systems
Digitally Controlled Op Amp Offset Adjustment
Process Control
Digital Attenuators
1/4 LSB Endpoint Linearity
Plastic Chip Carrier
DAC8408
FUNCTIONAL BLOCK DIAGRAM
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 617/329-4700
A common 8-bit TTL/CMOS compatible input port is used to
load data into any of the four DAC data-latches. Control lines
DS1, DS2, and A/B determine which DAC will accept data.
Data loading is similar to that of a RAMs write cycle. Data can
be read back onto the same data bus with control line R/W. The
DAC8408 is bus compatible with most 8-bit microprocessors,
including the 6800, 8080, 8085, and Z80. The DAC8408 oper-
ates on a single +5 volt supply and dissipates less than 20 mW.
The DAC8408 is manufactured using PMI’s highly stable,
thin-film resistors on an advanced oxide-isolated, silicon-gate,
CMOS process. PMI’s improved latch-up resistant design elimi-
nates the need for external protective Schottky diodes.
Model
DAC8408GP
DAC8408ET
DAC8408AT
DAC8408FT
DAC8408BT
DAC8408FPC
DAC8408FS
DAC8408FP
NOTES
1
2
3
Burn-in is available on commercial and industrial temperature range parts
in cerdip, plastic DIP, and TO-can packages. For outline information see Pack-
age Information section.
For devices processed in total compliance to MIL-STD-883, add /883 after
part number. Consult factory for 883 data sheet.
For availability and burn-in information on SO and PLCC packages, contact
your local sales office.
Quad 8-Bit Multiplying CMOS
D/A Converter with Memory
2
2
3
INL
1/4 LSB
1/4 LSB
1/4 LSB
1/2 LSB
1/2 LSB
1/2 LSB
1/2 LSB
1/2 LSB
ORDERING INFORMATION
DNL
1/2 LSB 0 C to +70 C
1/2 LSB –40 C to +85 C
1/2 LSB –55 C to +125 C
1 LSB
1 LSB
1 LSB
1 LSB
1 LSB
Temperature
Range
–40 C to +85 C
–55 C to +125 C
–40 C to +85 C
–40 C to +85 C
–40 C to +85 C
DAC8408
Fax: 617/326-8703
1
Package
Description
28-Pin Plastic DIP
28-Pin Cerdip
28-Pin Cerdip
28-Pin Cerdip
28-Pin Cerdip
28-Contact PLCC
28-Pin SOL
28-Pin Plastic DIP

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dac8408ft Summary of contents

Page 1

... CMOS process. PMI’s improved latch-up resistant design elimi- nates the need for external protective Schottky diodes. Model DAC8408GP DAC8408ET DAC8408AT DAC8408FT DAC8408BT DAC8408FPC DAC8408FS DAC8408FP NOTES 1 Burn-in is available on commercial and industrial temperature range parts in cerdip, plastic DIP, and TO-can packages ...

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DAC8408 ELECTRICAL CHARACTERISTICS DAC8408AT/BT – +85 C apply for DAC8408ET/FT/FP/FPC/FS Specifications apply for DAC & D.) Parameter STATIC ACCURACY Resolution 1, 2 Nonlinearity Differential Nonlinearity Gain Error 3, 6 Gain Tempco ...

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ELECTRICAL CHARACTERISTICS DAC8408AT/BT – +85 C apply for DAC8408ET/FT/FP/FPC/FS Specifications apply for DAC & D. Continued Parameter POWER SUPPLY Voltage Range 8 Supply Current 9 Supply Current NOTES 1 This is ...

Page 4

DAC8408 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 the DAC8408 features proprietary ESD protection circuitry, permanent damage may occur ...

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WAFER TEST LIMITS DAC & D. Parameter Symbol STATIC ACCURACY Resolution N 1 Nonlinearity INL Differential Nonlinearity DNL Gain Error G FSE Power Supply Rejection PSR ...

Page 6

DAC8408 TYPICAL PERFORMANCE CHARACTERISTICS Supply Current vs. Logic Level Analog Crosstalk vs. Frequency –6– REV. A ...

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PARAMETER DEFINITIONS RESOLUTION n Resolution is the number of states (2 ) that the full-scale range (FSR DAC is divided (or resolved) into. NONLINEARITY Nonlinearity (Relative Accuracy measure of the maximum deviation from a straight line ...

Page 8

DAC8408 CIRCUIT INFORMATION The DAC8408 combines four identical 8-bit CMOS DACs onto a single monolithic chip. Each DAC has its own reference input, feedback resistor, and on-board data latches. It also fea- tures a read/write function that serves as an ...

Page 9

Figure 4. Equivalent DAC Circuit (AII Digital Inputs LOW) DIGITAL SECTION Figure 5 shows the digital input/output structure for one bit. The digital WR, WR, and RD controls shown in the figure are internally generated from the external A/B, R/W, ...

Page 10

DAC8408 BASIC APPLICATIONS Some basic circuit configurations are shown in Figures 6 and 7. Figure 6 shows the DAC8408 connected in a unipolar configu- ration (2-Quadrant Multiplication), and Table I shows the Code Table. Resistors R1, R2, R3, and R4 ...

Page 11

Figure 7. Quad DAC Bipolar Operation (4-Quadrant Multiplication) Table II. Bipolar (Offset Binary) Code Table (Refer to Figure 7) DAC Data Input Analog Output MSB LSB (DAC A OR DAC ...

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DAC8408 SINGLE SUPPLY, VOLTAGE OUTPUT OPERATION The DAC8408 can be connected with a single +5 V supply to produce DAC output voltages from +1 Figure 8, the DAC8408 R-2R ladder is inverted from its normal ...

Page 13

Figure 9. A Digitally Programmable Universal Active Filter A DIGITALLY PROGRAMMABLE ACTIVE FILTER A powerful D/A converter application is a programmable active filter design as shown in Figure 9. The design is based on the state-variable filter topology which offers ...

Page 14

DAC8408 Figure 11. A Digitally Programmable, Low-Distortion Sinewave Oscillator A LOW-DISTORTION, PROGRAMMABLE SINEWAVE OSCILLATOR By varying the previous state-variable filter topology slightly, one can obtain a very low distortion sinewave oscillator with programmable frequency feature as shown in Figure 11. ...

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