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DAC2813AP Schematic ( PDF Datasheet ) - Burr-Brown Corporation

Teilenummer DAC2813AP
Beschreibung DUAL 12-BIT DIGITAL-TO-ANALOG CONVERTER 12-bit port interface
Hersteller Burr-Brown Corporation
Logo Burr-Brown Corporation Logo 




Gesamt 9 Seiten
DAC2813AP Datasheet, Funktion
® DAC2813
DUAL 12-BIT DIGITAL-TO-ANALOG
CONVERTER (12-bit port interface)
FEATURES
q COMPLETE WITH REFERENCE AND
OUTPUT AMPLIFIERS
q 12-BIT PORT INTERFACE
q ANALOG OUTPUT RANGE: ±10V
q MONOTONICITY GUARANTEED OVER
TEMPERATURE
q INTEGRAL LINEARITY
ERROR: ±1/2LSB max
q ±12V to ±15V SUPPLIES
q 28-PIN PLASTIC DIP PACKAGE
DESCRIPTION
DAC2813 is a complete dual 12-bit digital-to-analog
converter with bus interface logic. Each package in-
cludes a precision +10V voltage reference, double-
buffered bus interface including a RESET function
and 12-bit D/A converters with voltage-output opera-
tional amplifiers.
The double-buffered interface consists of a 12-bit
input latch and a D/A latch for each D/A converter. A
RESET control allows the D/A outputs to be asyn-
chronously reset to bipolar zero, a feature useful for
power-up reset, system initialization and recalibration.
DAC2813 output range resistors are internally con-
nected for 20V full scale range. A 0 to 10V range can
be connected using the bipolar offset resistor. Gain
and bipolar offset of each D/A are adjustable with
external trim potentiometers.
DAC2813 is available in one performance grade with
a integral linearity error of 1/2LSB and 12-bit mono-
tonicity guaranteed over temperature. It is packaged in
28-pin 0.6in. wide plastic DIP package and specified
over –40oC to +85oC.
DAC2813
10V
Reference
VREF OUT
VREF IN 1
BPO 1
DB0 LSB
12
DB11
MSB
D/A 1
12-bit
Latches
D/A 2
VOUT 1
VREF IN 2
BPO 2
VOUT 2
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
Internet: http://www.burr-brown.com/ • FAXLine: (800) 548-6133 (US/Canada Only) • Cable: BBRCORP • Telex: 066-6491 • FAX: (520) 889-1510 • Immediate Product Info: (800) 548-6132
© 1992 Burr-Brown Corporation
PDS-1147C
Printed in U.S.A. October, 1993






DAC2813AP Datasheet, Funktion
TYPICAL PERFORMANCE CURVES (CONT)
At TA = +25°C, VCC = ±15V, unless otherwise noted.
SETTLING TIME, +10V TO –10V
20 VOUT
1LSB = 4.88mV
10
VOUT
0
WR
–10 +5
20
10
0
–10
–20
–20 0 –40
–2 0 2 4 6 8 10 12
Time (µs)
–2 0
SETTLING TIME, –10V TO +10V
1LSB = 4.88mV
VOUT
WR +5
VOUT
2468
Time (µs)
0
10 12 14
DISCUSSION OF
SPECIFICATIONS
LINEARITY ERROR
Linearity error is defined as the deviation of the analog
output from a straight line drawn between the end points
(digital inputs all “1s” and all “0s”). DAC2813 linearity
error is ±1/2LSB max at +25oC.
DIFFERENTIAL LINEARITY ERROR
Differential Linearity Error (DLE) is the deviation from a
1LSB output change from one adjacent state to the next. A
DLE specification of 1/2LSB means that the output step size
can range from 1/2LSB to 3/2LSB when the digital input
code changes from one code word to the adjacent code word
If the DLE is more positive than –1LSB, the D/A is said to
be monotonic.
MONOTONICITY
A D/A converter is monotonic if the output either increases
or remains the same for increasing digital input values.
DAC2813 is monotonic over their specification temperature
range –40oC to +85oC.
DRIFT
Gain Drift is a measure of the change in the Full Scale
Range (FSR) output over the specification temperature range.
Gain Drift is expressed in parts per million per degree
Celsius (ppm/oC).
Bipolar Zero Drift is measured with a data input of 800 .
HEX
The D/A is configured for bipolar output. Bipolar Zero Drift
is expressed in parts per million of Full Scale Range per
degree Celsius (ppm of FSR/oC).
SETTLING TIME
Settling Time is the total time (including slew time) for the
output to settle to within an error band around its final value
after a change in input. Settling times are specified to
±0.01% of Full Scale Range (FSR) for two conditions: one
for a FSR output change of 20V (25kfeedback) and one
for a 1LSB change. The 1LSB change is measured at the
Major Carry (7FFHEX to 800HEX, and 800HEX to 7FFHEX), the
input code transition at which worst-case settling time oc-
curs.
OPERATION
INTERFACE LOGIC
The bus interface logic of the DAC2813 consists of two
independently addressable latches in two ranks for each
D/A converter. The first rank consists of one 12-bit input
latch which can be loaded directly from a 12- or 16-bit
microprocessor/microcontroller bus. The input latch holds
data temporarily before it is loaded into the second latch, the
D/A latch. This double buffered organization permits simul-
taneous update of all D/As.
All latches are level-triggered. Data present when the con-
trol signals are logic “0” will enter the latch. When the
control signals return to logic “1”, the data is latched.
CAUTION: DAC2813 was designed to use WR as the fast
strobe. WR/ has a much faster logic path than ENX (or
LDAC). Therefore, if one permanently wires WR to DCOM
and uses only ENX to strobe data into the latches, the DATA
®
DAC2813
6

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