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AD766JN датащи(PDF) 4 Page - Analog Devices

номер детали AD766JN
подробное описание детали  16-Bit DSP DACPORT
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производитель  AD [Analog Devices]
домашняя страница  http://www.analog.com
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AD766JN датащи(HTML) 4 Page - Analog Devices

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AD766–Definition of Specifications
–4–
REV. A
TOTAL HARMONIC DISTORTION
Total Harmonic Distortion (THD) is defined as the ratio of the
square root of the sum of the squares of the values of the har-
monics to the value of the fundamental input frequency. It is ex-
pressed in percent (%) or decibels (dB).
THD is a measure of the magnitude and distribution of integral
linearity error and differential linearity error. The distribution of
these errors may be different, depending on the amplitude of the
output signal. Therefore, to be most useful, THD should be
specified for both large and small signal amplitudes.
SETTLING TIME
Settling Time is the time required for the output to reach and
remain within a specified error band about its final value, mea-
sured from the digital input transition. It is the primary measure
of dynamic performance.
BIPOLAR ZERO ERROR
Bipolar Zero Error or midscale error is the deviation of the ac-
tual analog output from the ideal output (0 V) when the 2s
complement input code representing half scale (all 0s) is loaded
in the input register.
DIFFERENTIAL LINEARITY ERROR
Differential Linearity Error is the measure of the variation in
analog value, normalized to full scale, associated with a 1 LSB
change in the digital input. Monotonic behavior requires that
the differential linearity error not exceed 1 LSB in the negative
direction.
MONOTONICITY
A D/A converter is monotonic if the output either increases or
remains constant as the digital input increases.
SIGNAL-TO-NOISE RATIO
SNR is defined as the ratio of the fundamental to the square
root of the sum of the squares for the values of all the nonfun-
damental, nonharmonic signals for a specified bandwidth. SNR
is tested at full-scale input. The AD766 specifies SNR for
20 kHz and 250 kHz bandwidths.
FUNCTIONAL DESCRIPTION
Serial input data is clocked into the AD766’s shift register by
the falling edge of CLK. Data is presumed to be in twos
complement format with MSB (i.e., the sign bit) clocked in first.
The shift register converts the most recently clocked-in 16 bits
to a parallel word. The falling edge of the latch enable (LE) sig-
nal causes the most recent parallel word to be transferred to the
internal DAC input latch. See Figure 2 for detailed serial port
timing requirements.
The contents of the DAC input latch cause the 16-bit DAC to
generate a corresponding current. This
±1 mA current is avail-
able directly on the IOUT pin.
To use the internal op amp, connect IOUT (Pin 13) directly to
the summing junction pin, SJ (Pin 11) and connect the feedback
resistor pin, RF (Pin 10) to VOUT (Pin 9). Note that the internal
op amp is in the inverting configuration. Using the internal
3 k
Ω feedback resistor, this op amp will produce ±3 V outputs.
One advantage of external pins at each end of the feedback
resistor is that it allows the user to implement a single pole
active low-pass filter simply by adding a capacitor across these
pins (Pins 10 and 13). The circuit can best be understood
redrawn as shown in Figure 1.
Figure 1. Low-Pass Filter Using External Capacitor
The frequency response from this filter will be
VOUT (s)
IOUT
=
−R
F
RF •C s +1
where RF is 3 k
Ω (±20%).
Figure 2. AD766 Serial Input Timing


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