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PDF AS5181 Data sheet ( Hoja de datos )
| Número de pieza | AS5181 | |
| Descripción | DAC | |
| Fabricantes | Micross Components | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de AS5181 (archivo pdf) en la parte inferior de esta página. Total 16 Páginas | ||
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10 Bit, 40MHz
Current -Output DACs
FEATURES
• +2.7V to +3.3V Single-Supply Operation
• Wide Spurious-Free Dynamic Range: 70dB at
• FfOuUllTy=D2i.f2feMreHnztial Output
• Low-Current Standby or Full Shutdown Modes
• Internal +1.2V, Low-Noise Bandgap Reference
• Small 24-Pin Flat-pack Package
OPTIONS
• Package(s)
24-Pin Flat-pack
MARKING
F
• Operating Temperature Ranges
Extended Temperature (-55oC to +125oC)
Industrial Temperature (-40°C to +85°C)
Military Processing (-55°C to +125°C)
Space Processing (-55oC to +125oC)
XT
IT
MIL
SPACE
DAC
AS5181
PIN ASSIGNMENT
(Top View)
24-Pin Flat Pack (F)
GENERAL DESCRIPTION
The AS5181 is a 10-bit, current-output digital-to-analog
converter (DAC) designed for superior performance in signal
reconstruction or arbitrary waveform generation applications
requiring analog signal reconstruction with low distortion
and low-power operation. The AS5181 are designed for a
10pVs glitch operation to minimize unwanted spurious signal
components at the output. An on-board 1.2V bandgap circuit
provides a well-regulated, low-noise reference that can be
disabled for external reference operation.
The devices are designed to provide a high level of sig-
nal integrity for the least amount of power dissipation. They
operate from a single 2.7V to 3.3V supply. Additionally,
these DACs have three modes of operation: normal, low-
power standby, and full shutdown, which provides the lowest
possible power dissipation with a 1μA (max) shutdown current.
A fast wake-up time (0.5μs) from standby mode to full DAC
operation facilitates power conservation by activating the DAC
only when required.
For more products and information
please visit our web site at
www.micross.com
AS5181
Rev. 0.4 01/10
Micross Components reserves the right to change products or specifications without notice.
1
1 page  
DAC
AS5181
TYPICAL OPERATING CHARACTERISTICS (AVDD = DVDD = +3V,
AGND = DGND = 0, IFS = 1mA, 400Ω differential output, CL = 5pF, TA
= +25°C, unless otherwise noted.) (continued)
AS5181
Rev. 0.4 01/10
Micross Components reserves the right to change products or specifications without notice.
5
5 Page 
DAC
AS5181
Digital Feedthrough
Digital feedthrough is the noise generated on a DAC’s
output when any digital input transitions. Proper board layout
and grounding will significantly reduce this noise, but there
will always be some feedthrough caused by the DAC itself.
Total Harmonic Distortion
Total harmonic distortion (THD) is the ratio of the RMS sum
of the input signal’s first four harmonics to the fundamental
itself. This is expressed as:
where V1 is the fundamental amplitude, and V2 through V5 are
the amplitudes of the 2nd- through 5th-order harmonics.
Spurious-Free Dynamic Range
Spurious-free dynamic range (SFDR) is the ratio of RMS
amplitude of the fundamental (maximum signal component)
to the RMS value of the next-largest distortion component.
Differential to Single-Ended Conversion
A low-distortion, high-input bandwidth amplifier may be
used to generate a voltage from the array current output of the
AS5181. The differential voltage across OUTP and OUTN
is converted into a single-ended voltage by designing an
appropriate operational amplifier configuration (Figure 6).
I/Q Reconstruction in a QAM Application
The low-distortion performance of two AS5181s
supports analog reconstruction of in-phase (I) and quadrature
(Q) carrier components typically used in quadrature amplitude
modulation (QAM) architectures where two separate buses
carry the I and Q data. A QAM signal is both amplitude (AM)
and phase modulated, created by summing two independently
modulated carriers of identical frequency but different phase
(90° phase difference).
In a typical QAM application (Figure 7), the modulation
occurs in the digital domain, and two DACs such as the AS5181
may be used to reconstruct the analog I and Q components.
The I/Q reconstruction system is completed by a
quadrature modulator that combines the reconstructed
components with in-phase and quadrature carrier frequencies
and then sums both outputs to provide the QAM signal.
FIGURE 4: TIMING DIAGRAM
AS5181
Rev. 0.4 01/10
11
Micross Components reserves the right to change products or specifications without notice.
11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet AS5181.PDF ] | |
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