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DAC709SH Folha de dados(PDF) 6 Page - Burr-Brown (TI)

[Old version datasheet] Texas Instruments acquired Burr-Brown Corporation.
Nome de Peças DAC709SH
Descrição Electrónicos  Microprocessor-Compatible 16-BIT DIGITAL-TO-ANALOG CONVERTERS
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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)

DAC709SH Folha de dados(HTML) 6 Page - Burr-Brown (TI)

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®
DAC707/708/709
6
DISCUSSION OF
SPECIFICATIONS
DIGITAL INPUT CODES
For bipolar operation, the DAC707/708/709 accept positive-
true binary two’s complement input code. For unipolar
operation (DAC708/709 only) the input code is positive-true
straight-binary provided that the MSB input is inverted with
an external inverter. See Table I.
the MSB must be inverted). This code corresponds to zero
volts (DAC707 and DAC709) or zero milliamps (DAC708)
at the analog output. The maximum change in offset at t
MIN
or t
MAX is referenced to the zero error at +25°C and is divided
by the temperature change. This drift is expressed in FSR/
°C.
SETTLING TIME
Settling time of the D/A is the total time required for the
analog output to settle within an error band around its final
value after a change in digital input. Refer to Figure 1 for
typical values for this family of products.
FIGURE 1. Final-Value Error Band Versus Full-Scale Range
Settling Time.
Voltage Output
Settling times are specified to
±0.003% of FSR (±1/2LSB
for 14 bits) for two input conditions: a full-scale range
change of 20V (
±10V) or 10V (±5V or 0 to 10V) and a 1LSB
change at the “major carry”, the point at which the worst-
case settling time occurs. (This is the worst-case point since
all of the input bits change when going from one code to the
next.)
Current Output
Settling times are specified to
±0.003% of FSR for a full-
scale range change for two output load conditions: one for
10
Ω to 100Ω and one for 1000Ω. It is specified this way
because the output RC time constant becomes the dominant
factor in determining settling time for large resistive loads.
COMPLIANCE VOLTAGE
Compliance voltage applies only to current output models. It
is the maximum voltage swing allowed on the output current
pin while still being able to maintain specified accuracy.
POWER SUPPLY SENSITIVITY
Power supply sensitivity is a measure of the effect of a
change in a power supply voltage on the D/A converter
ANALOG OUTPUT
Digital
Unipolar Straight Binary(1)
Binary Two's Complement
Input
(DAC708/709 only; connected
(Bipolar operation;
Codes
for Unipolar operation)
all models)
7FFFH
+1/2 Full Scale –1LSB(2)
+Full Scale
0000H
Zero
Zero
FFFFH
+Full Scale
–1LSB
8000H
+1/2 Full Scale
–Full Scale
NOTES: (1) MSB must be inverted externally. (2) Assumes MSB is inverted
externally.
TABLE I. Digital Input Codes.
ACCURACY
Linearity
This specification describes one of the most important mea-
sures of performance of a D/A converter. Linearity error is
the deviation of the analog output from a straight line drawn
through the end points (–Full Scale point and +Full Scale
point).
Differential Linearity Error
Differential Linearity Error (DLE) of a D/A converter is the
deviation from an ideal 1LSB change in the output when the
input changes from one adjacent code to the next. A differ-
ential linearity error specification of
±1/2LSB means that the
output step size can be between 1/2LSB and 3/2LSB when
the input changes between adjacent codes. A negative DLE
specification of –1LSB maximum (–0.006% for 14-bit reso-
lution) insures monotonicity.
Monotonicity
Monotonicity assures that the analog output will increase or
remain the same for increasing input digital codes. The
DAC707/708/709 are specified to be monotonic to 14 bits
over the entire specification temperature range.
DRIFT
Gain Drift
Gain Drift is a measure of the change in the full-scale range
output over temperature expressed in parts per million per
degree centigrade (ppm/
°C). Gain drift is established by: (1)
testing the end point differences at t
MIN, +25°C and tMAX; (2)
calculating the gain error with respect to the +25
°C value;
and (3) dividing by the temperature change.
Zero Drift
Zero Drift is a measure of the change in the output with
0000
H applied to the D/A converter inputs over the specified
temperature range. (For the DAC708/709 in unipolar mode,
1
0.1
0.01
0.01
0.1
1
10
Settling Time (µs)
0.001
DAC707
DAC709
R = 100
R = 1k
L
L
DAC708


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