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ISL5757IB Datasheet(PDF) 9 Page - Intersil Corporation

Part # ISL5757IB
Description  10-bit, 3.3V, 260MSPS, High Speed D/A Converter
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Manufacturer  INTERSIL [Intersil Corporation]
Direct Link  http://www.intersil.com/cda/home
Logo INTERSIL - Intersil Corporation

ISL5757IB Datasheet(HTML) 9 Page - Intersil Corporation

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9
FN6078.1
November 12, 2004
Definition of Specifications
Adjacent Channel Power Ratio, ACPR, is the ratio of the
average power in the adjacent frequency channel (or offset)
to the average power in the transmitted frequency channel.
Differential Linearity Error, DNL, is the measure of the
step size output deviation from code to code. Ideally the step
size should be 1 LSB. A DNL specification of 1 LSB or less
guarantees monotonicity.
EDGE, Enhanced Data for Global Evolution, a TDMA
standard for cellular applications which uses 200kHz BW,
8-PSK modulated carriers.
Full Scale Gain Drift, is measured by setting the data inputs
to be all logic high (all 1s) and measuring the output voltage
through a known resistance as the temperature is varied
from TMIN to TMAX. It is defined as the maximum deviation
from the value measured at room temperature to the value
measured at either TMIN or TMAX. The units are ppm of FSR
(full scale range) per °C.
Full Scale Gain Error, is the error from an ideal ratio of 32
between the output current and the full scale adjust current
(through RSET).
GSM, Global System for Mobile Communication, a TDMA
standard for cellular applications which uses 200kHz BW,
GMSK modulated carriers.
Integral Linearity Error, INL, is the measure of the worst
case point that deviates from a best fit straight line of data
values along the transfer curve.
Internal Reference Voltage Drift, is defined as the
maximum deviation from the value measured at room
temperature to the value measured at either TMIN or TMAX.
The units are ppm per °C.
Offset Drift, is measured by setting the data inputs to all
logic low (all 0s) and measuring the output voltage at IOUTA
through a known resistance as the temperature is varied
from TMIN to TMAX. It is defined as the maximum deviation
from the value measured at room temperature to the value
measured at either TMIN or TMAX. The units are ppm of FSR
(full scale range) per degree °C.
Offset Error, is measured by setting the data inputs to all
logic low (all 0s) and measuring the output voltage of IOUTA
through a known resistance. Offset error is defined as the
maximum deviation of the IOUTA output current from a value
of 0mA.
Output Voltage Compliance Range, is the voltage limit
imposed on the output. The output impedance should be
chosen such that the voltage developed does not violate the
compliance range.
Power Supply Rejection, is measured using a single power
supply. The nominal supply voltage is varied ±10% and the
change in the DAC full scale output is noted.
Reference Input Multiplying Bandwidth, is defined as the
3dB bandwidth of the voltage reference input. It is measured
by using a sinusoidal waveform as the external reference
with the digital inputs set to all 1s. The frequency is
increased until the amplitude of the output waveform is
0.707 (-3dB) of its original value.
Spurious Free Dynamic Range, SFDR, is the amplitude
difference from the fundamental signal to the largest
harmonically or non-harmonically related spur within the
specified frequency window.
Total Harmonic Distortion, THD, is the ratio of the RMS
value of the fundamental output signal to the RMS sum of
the first five harmonic components.
UMTS, Universal Mobile Telecommunications System, a
W-CDMA standard for cellular applications which uses
3.84MHz modulated carriers.
Detailed Description
The ISL5757 is a 10-bit, current out, CMOS, digital to analog
converter. The maximum update rate is at least 260+MSPS
and can be powered by a single power supply in the
recommended range of +3.0V to +3.6V. It consumes less
than 120mW of power when using a +3.3V supply, the
maximum 20mA of output current, and the data switching at
210MSPS. The architecture is based on a segmented
current source arrangement that reduces glitch by reducing
the amount of current switching at any one time. In previous
architectures that contained all binary weighted current
sources or a binary weighted resistor ladder, the converter
might have a substantially larger amount of current turning
on and off at certain, worst-case transition points such as
midscale and quarter scale transitions. By greatly reducing
the amount of current switching at these major transitions,
the overall glitch of the converter is dramatically reduced,
improving settling time, transient problems, and accuracy.
Digital Inputs and Termination
The ISL5757 digital inputs are guaranteed to 3V LVCMOS
levels. The internal register is updated on the rising edge of
the clock. To minimize reflections, proper termination should
be implemented. If the lines driving the clock and the digital
inputs are long 50
Ω lines, then 50Ω termination resistors
should be placed as close to the converter inputs as possible
connected to the digital ground plane (if separate grounds
are used). These termination resistors are not likely needed
as long as the digital waveform source is within a few inches
of the DAC. For pattern drivers with very high speed edge
rates, it is recommended that the user consider series
termination (50-200
Ω) prior to the DAC’s inputs in order to
reduce the amount of noise.
Power Supply
Separate digital and analog power supplies are
recommended. The allowable supply range is +2.7V to
+3.6V. The recommended supply range is +3.0 to 3.6V
ISL5757


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