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What is DAC7528UB?

This electronic component, produced by the manufacturer "Burr-Brown Corporation", performs the same function as "CMOS Dual 8-Bit Buffered Multiplying DIGITAL-TO-ANALOG CONVERTER".


DAC7528UB Datasheet PDF - Burr-Brown Corporation

Part Number DAC7528UB
Description CMOS Dual 8-Bit Buffered Multiplying DIGITAL-TO-ANALOG CONVERTER
Manufacturers Burr-Brown Corporation 
Logo Burr-Brown Corporation Logo 


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® DAC7528
CMOS Dual 8-Bit Buffered Multiplying
DIGITAL-TO-ANALOG CONVERTER
FEATURES
q DOUBLE BUFFERED DATA LATCHES
q SINGLE 5V SUPPLY OPERATION
q ±1/2 LSB LINEARITY
q FOUR-QUADRANT MULTIPLICATION
q DACs MATCHED TO 1%
APPLICATIONS
q DIGITALLY CONTROLLED FILTERS
q DISK DRIVES
q AUTO CALIBRATION
q MOTOR CONTROL SYSTEMS
q PROGRAMMABLE GAIN/ATTENUATION
q X-Y GRAPHICS
VDD 17
Data DB0 (LSB) 14
Inputs
DB7 (MSB) 7
Input
Buffer
DESCRIPTION
The DAC7528 contains two, 8-bit multiplying digital-
to-analog converters (DACs). Separate on-chip latches
hold the input data for each DAC to allow easy
interface to microprocessors.
Each DAC operates independently with separate refer-
ence input pins and internal feedback resistors. Excel-
lent converter-to-converter matching is maintained.
The DAC7528 operates from a single +5V power
supply. The inputs are TTL-compatible. Package
options include 20-pin plastic DIP and SOIC.
Latch
VREF A
4
DAC A
3 RFB A
2 OUT A
DAC A/
DAC B 6
CS 15
WR 16
DGND 5
Control
Logic
DAC7528
Latch
DAC B
1 AGND
19 RFB B
20 OUT B
18
VREF B
International Airport Industrial Park • Mailing Address: PO Box 11400 • Tucson, AZ 85734 • Street Address: 6730 S. Tucson Blvd. • Tucson, AZ 85706
Tel: (520) 746-1111 • Twx: 910-952-1111 • Cable: BBRCORP • Telex: 066-6491 • FAX: (520) 889-1510 • Immediate Product Info: (800) 548-6132
©1993 Burr-Brown Corporation
PDS-1219A
Printed in U.S.A. June, 1994

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DAC7528UB equivalent
DISCUSSION OF
SPECIFICATIONS
RELATIVE ACCURACY
This term, also known as end point linearity or integral
linearity, describes the transfer function of analog output to
digital input code. Relative accuracy describes the deviation
from a straight line, after zero and full scale errors have been
adjusted to zero.
DIFFERENTIAL NONLINEARITY
Differential nonlinearity is the deviation from an ideal 1LSB
change in the output when the input code changes by 1LSB.
A differential nonlinearity specification of 1LSB maximum
guarantees monotonicity.
GAIN ERROR
Gain error is the difference between the full-scale DAC
output and the ideal value. The ideal full scale output value
for the DAC7528 is –(255/256)VREF. Gain error may be
adjusted to zero using external trims as shown in Figure 4.
OUTPUT LEAKAGE CURRENT
The current which appears at IOUT A and IOUT B with the
DAC loaded with all zeros.
OUTPUT CAPACITANCE
The parasitic capacitance measured from IOUT A or IOUT B to
AGND.
CHANNEL-TO-CHANNEL ISOLATION
The AC output error due to capacitive coupling from DAC
A to DAC B or DAC B to DAC A.
AC FEEDTHROUGH ERROR
The AC output error due to capacitive coupling from VREF
to IOUT with the DAC loaded with all zeros.
OUTPUT CURRENT SETTLING TIME
The time required for the output current to settle to within
±0.195% of final value for a full scale step.
DIGITAL-TO-ANALOG IMPULSE
The integrated area of the glitch pulse measured in nanovolt-
seconds. The key contributor to digital-to-analog glitch is
charge injected by digital logic switching transients.
DIGITAL CROSSTALK
Glitch impulse measured at the output of one DAC but
caused by a full scale transition on the other DAC. The
integrated area of the glitch pulse is measured in nanovolt-
seconds.
CIRCUIT DESCRIPTION
Figure 1 shows a simplified schematic of one half of a
DAC7528. The current from the VREF A pin is switched
between IOUT A and AGND by 8 single-pole double-throw
CMOS switches. This maintains a constant current in each
leg of the ladder regardless of the input code. The input
resistance at VREF A is therefore constant and can be driven
by either a voltage or current, AC or DC, positive or
negative polarity, and have a voltage range up to ±20V.
VREF A
R
2R
RR
2R 2R
2R 2R R RFB A
IOUT A
DB7 DB6 DB5
(MSB)
DB0
(LSB)
FIGURE 1. Equivalent Circuit for DAC A.
AGND
A CMOS switch transistor, included in series with the ladder
terminating resistor and in series with the feedback resistor,
RFB A, compensates for the temperature drift of the ON
resistance of the ladder switches.
Figure 2 shows an equivalent circuit for DAC A. COUT is the
output capacitance due to the N-channel switches and varies
from about 30pF to 70pF with digital input code. The current
source ILKG is the combination of surface and junction
leakages to the substrate. ILKG approximately doubles every
10°C. RO is the equivalent output resistance of the D/A and
it varies with input code.
VREF A
R
DIN x VREF
256 R
RO
ILKG
R
RFB A
IOUT A
COUT
AGND
FIGURE 2. Simplified Circuit Diagram for DAC A.
INSTALLATION
ESD PROTECTION
All digital inputs of the DAC7528 incorporate on-chip ESD
protection circuitry. This protection is designed to withstand
2.5kV (using the Human Body Model, 100pF and 1500).
However, industry standard ESD protection methods should
be used when handling or storing these components. When
not in use, devices should be stored in conductive foam or
rails. The foam or rails should be discharged to the destina-
tion socket potential before devices are removed.
®
5 DAC7528


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On this page, you can learn information such as the schematic, equivalent, pinout, replacement, circuit, and manual for DAC7528UB electronic component.


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Featured Datasheets

Part NumberDescriptionMFRS
DAC7528UThe function is CMOS Dual 8-Bit Buffered Multiplying DIGITAL-TO-ANALOG CONVERTER. Burr-Brown CorporationBurr-Brown Corporation
DAC7528UBThe function is CMOS Dual 8-Bit Buffered Multiplying DIGITAL-TO-ANALOG CONVERTER. Burr-Brown CorporationBurr-Brown Corporation
DAC7528UBThe function is CMOS Dual 8-Bit Buffered Multiplying DIGITAL-TO-ANALOG CONVERTER. Burr-Brown CorporationBurr-Brown Corporation

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