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DAC716 Fiches technique(PDF) 6 Page - Texas Instruments

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No de pièce DAC716
Description  16-Bit DIGITAL-TO-ANALOG CONVERTER with Serial Data Interface
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Fabricant  TI1 [Texas Instruments]
Site Internet  http://www.ti.com
Logo TI1 - Texas Instruments

DAC716 Fiches technique(HTML) 6 Page - Texas Instruments

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6
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DAC716
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 of
the transfer characteristic.
DIFFERENTIAL LINEARITY ERROR
Differential linearity error (DLE) is the deviation from
1LSB of an 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.
Monotonicity of the K grade is guaranteed over the specifi-
cation temperature range to 15 bits.
SETTLING TIME
Settling time is the total time (including slew time) for the
D/A output to settle to within an error band around its final
value after a change in input. Settling times are specified to
within
±0.003% of Full Scale Range (FSR) for an output
step change of 10V and 1LSB. The 1LSB change is mea-
sured at the Major Carry (7FFF to 8000, and 8000 to 7FFF:
Straight Binary codes), the input transition at which worst-
case settling time occurs.
TOTAL HARMONIC DISTORTION + NOISE
Total harmonic distortion + noise is defined as the ratio of
the square root of the sum of the squares of the values of the
harmonics and noise to the value of the fundamental fre-
quency. It is expressed in % of the fundamental frequency
amplitude at sampling rate fS.
SIGNAL-TO-NOISE
AND DISTORTION RATIO (SINAD)
SINAD includes all the harmonic and outstanding spurious
components in the definition of output noise power in
addition to quantizing and internal random noise power.
SINAD is expressed in dB at a specified input frequency and
sampling rate, fS.
DIGITAL-TO-ANALOG GLITCH IMPULSE
The amount of charge injected into the analog output from
the digital inputs when the inputs change state. It is mea-
sured at half scale at the input codes where as many as
possible switches change state—from 8000 to 7FFF.
DIGITAL FEEDTHROUGH
When the A/D is not selected, high frequency logic activity
on the digital inputs is coupled through the device and shows
up as output noise. This noise is digital feedthrough.
OPERATION
The DAC716 is a monolithic integrated-circuit 16-bit D/A
converter complete with 16-bit D/A switches and ladder
network, voltage reference, output amplifier and a serial
interface.
INTERFACE LOGIC
The DAC716 has double-buffered data latches. The input
data latch holds a 16-bit data word before loading it into the
second latch, the D/A latch. This double-buffered organiza-
tion permits simultaneous update of several D/A converters.
All digital control inputs are active low. Refer to block
diagram of Figure 1.
All latches are level-triggered. Data present when the enable
inputs are logic “0” will enter the latch. When the enable
inputs return to logic “1”, the data is latched.
The CLR input resets both the input latch and the D/A latch
to give an output voltage of 0V (code 0000).
LOGIC INPUT COMPATIBILITY
DAC716 digital inputs are TTL compatible (1.4V switching
level) with low leakage, high impedance inputs. Thus the
inputs are suitable for being driven by any type of 5V logic
such as 5V CMOS logic. An equivalent circuit of a digital
input is shown in Figure 2.
Data inputs will float to logic “0” and control inputs will
float to logic “0” if left unconnected. It is recommended that
any unused inputs be connected to DCOM to improve noise
immunity.
Digital inputs remain high impedance when power is off.
INPUT CODING
The DAC716 is designed to accept Straight Binary (SB)
input codes. The serial input format is MSB first.
INTERNAL REFERENCE
DAC716 contains a +10V reference.
The reference output may be used to drive external loads,
sourcing up to 2mA. The load current should be constant,
otherwise the gain and unipolar offset of the converter will
vary.
OUTPUT VOLTAGE SWING
The output amplifier of DAC716 is designed to achieve a
+10V output range. DAC716 will provide a +10V output
swing while operating on
±11.4V or higher voltage supplies.


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