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DAC2813AP Folha de dados(PDF) 7 Page - Burr-Brown (TI)

[Old version datasheet] Texas Instruments acquired Burr-Brown Corporation.
Nome de Peças DAC2813AP
Descrição Electrónicos  DUAL 12-BIT DIGITAL-TO-ANALOG CONVERTER 12-bit port interface
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Fabricante Electrônico  BURR-BROWN [Burr-Brown (TI)]
Página de início  http://www.burr-brown.com
Logo BURR-BROWN - Burr-Brown (TI)

DAC2813AP Folha de dados(HTML) 7 Page - Burr-Brown (TI)

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®
DAC2813
DAC2813 can be used with two’s complement coding if a
logic inverter is used ahead of the MSB input (DB11).
DAC2813 can be connected for 0 to +10V unipolar opera-
tion by using the BPO resistors, plus a 100
Ω series resistor,
in parallel with the internal feedback resistor. In this case, an
input code of 000
HEX gives zero volt output, an input of
FFF
HEX gives an output 1LSB below positive full scale.
INTERNAL/EXTERNAL REFERENCE USE
DAC2813 contains a +10V
±50mV voltage reference, V
REF
OUT. VREF OUT is available to drive external loads sourcing up
to 2mA. The load current should be constant, otherwise the
gain (and bipolar offset, if connected) of the D/A converters
will vary.
For DAC2813 V
REF OUT must be connected to VREF IN 1 and
V
REF IN 2 through gain adjust resistors with a nominal value
of 500
Ω. Trim potentiometers with a nominal value of
1000
Ω can be used to provide adjustment to zero gain error.
It is possible to use references other than +10V. The recom-
mended range of reference voltage is from +8V to +11V,
which allows both 8.192V and 10.24V ranges to be used.
However, DAC2813 is optimized for fixed-reference appli-
cations. If the reference voltage is expected to time-vary
over a wide range, a CMOS multiplying D/A is a better
choice.
HOLD time will be long, approximately 20ns to 30ns and
this time will vary considerably in this range from unit to
unit. DATA HOLD time using WR is 5ns max.
RESET FUNCTION
The Reset function resets only the D/A latch. Therefore,
after a RESET, good data must be written to all the input
latches before an LDAC – WR command is issued. Other-
wise, old data or unknown data is present in the input latches
and will be transferred to the D/A latch producing an analog
output value that may be unwanted.
LOGIC INPUT COMPATIBILITY
DAC2813 digital inputs are TTL compatible (1.4V switch-
ing level) over the operating range of +V
CC. Each input has
low leakage and high input impedance. Thus the inputs are
suitable for being driven by any type of 5V logic. An
equivalent circuit of a digital input is shown in Figure 1.
Open DATA input lines will float to 7V or more. Although
this will not harm the DAC2813, current spikes will occur in
the input lines when a logic 0 is asserted and, in addition, the
speed of the interface will be slower. A digital output driving
a DATA input line of the DAC2813 must not drive, or let
the DATA input float, above +5.5V. Unused DATA inputs
should be connected to DCOM.
Unused CONTROL inputs should be connected to a voltage
greater than +2V but not greater than +5.5V. If this voltage
is not available, the control inputs can be connected to +V
CC
through a 100k
Ω resistor to limit the input current.
FIGURE 1. Equivalent Digital Input Circuit.
INPUT CODING
DAC2813 accepts positive-true binary input codes. Input
coding for bipolar analog outputs is Bipolar Offset Binary
(BOB), where an input code of 000
HEX gives a minus full-
scale output, an input of FFF
HEX gives an output 1LSB below
positive full scale, and zero occurs for an input code of
800
HEX.
+ Full Scale
All Bits
Logic 0
1LSB
Range of
Offset Adjust
Offset Adj.
Translates
the Line
Digital Input
All Bits
Logic 1
Full Scale
Range
Gain Adjust
Rotates the Line
– Full Scale
MSB on All
Others Off
Bipolar
Offset
Range of
Gain Adjust
≈ ±1%
≈ ±0.4%
FIGURE 2. Relationship of Offset and Gain Adjustments
for a Bipolar D/A Converter.
ANALOG OUTPUT
UNIPOLAR
BIPOLAR
DIGITAL INPUT
0 TO +10V
±10V
FFF
HEX
+9.9976V
+9.9951V
800
HEX
+5.0000V
0.0000V
7FF
HEX
+4.9976V
–0.0049V
000
HEX
0.0000V
–10.0000V
1LSB
2.44mV
4.88mV
TABLE III. Analog Output Calibration Values.
DAC2813
DIGITAL INPUT
R
Data, LDAC, WR, RESET
500
EN
X
330
6.8V
10
to
20pF
Digital
Input
DCOM
I
I
R


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