Best of Both Worlds: Cirrus Logic A/D Converters Offer High Throughput of SAR Converters With High Resolution of Delta-Sigma Con
June 25 2007 - 9:00AM
Business Wire
With the introduction of the CS556x/7x/8x family of 16- and 24-bit
analog-to-digital converters (ADCs), Cirrus Logic (Nasdaq:CRUS) has
rewritten the rule book for high-performance Delta-Sigma industrial
analog converters. Unique to the semiconductor industry, Cirrus
Logic�s new family of high-precision analog converters combines the
higher-bandwidth, low-distortion performance of a SAR converter
with high-resolution, low-noise performance that is the hallmark of
Delta-Sigma ADCs. The breakthrough combination of features provides
designers of precision instrumentation, such as industrial process
controllers, laboratory instrumentation, medical instrumentation
and high-speed weighing systems, with a significantly higher level
of measurement accuracy, lower noise and higher throughput. �This
breakthrough performance means that various industrial applications
will be able to obtain an extremely accurate measurement of data,�
said John Paulos, vice president and general manager, Industrial
Products Division, Cirrus Logic. �Greater measurement accuracy
leads to a wealth of benefits for industrial systems such as
systems for achieving tighter production yields, higher-precision
machine tools, improved temperature control, valve control and
speed of flow, just to name a few.� The CS556x family overcomes
many of the critical performance issues associated with SAR and
Delta-Sigma converters. SAR converters are typically very sensitive
to noise, whether the source of noise is in the converter itself or
in the system that the SAR converter operates. Virtually any noise
present can � and often will � propagate directly to the output of
the converter. The CS556x provides a much higher level of noise
suppression than SAR converters, resulting in higher accuracy
conversions and reduced post-conversion processing while adding to
the robustness of the system. The CS556x also offers exceptional
differential non-linearity (DNL) error, which measures the accuracy
of the ADC and is of critical importance in control applications.
The family features DNL error as low as �0.04 LSB typical (CS5571),
compared to �1 LSB typical within SAR converters. In addition, the
single-clock latency digital filter allows conversion-rate
switching of the input with no loss in throughput. The CS556x�s
high-throughput precision performance stands out among
high-resolution Delta Sigma converters. With near-flat digital FIR
filter characteristics, the CS556x product line achieves
unrestricted, wide-bandwidth signal throughput usually seen only in
higher-speed SAR converters � at resolutions up to 24 bits. With
this flat filter, output data is a 1:1 representation of the input
signal across the entire frequency range, up to the sampling rate
of the converter. In comparison, most Delta Sigma converters
utilize Sinc filters, which attenuate the signal at specific
frequencies. Other additional key features of the CS556x include:
High-impedance buffered inputs that simplify external circuitry;
Fully differential inputs that provide the best possible noise
rejection and dynamic accuracy, with the ability to measure bipolar
signals; and Self calibration to ensure superior measurement
accuracy over variations in supply and temperature. A flexible
serial interface eases connections to a variety of microcontrollers
without external components (includes slave and self-sequencing
master modes). Pricing and Availability The CS5560 offers 24-bit
resolution, a conversion rate of 50 kSPS and is priced at $8.95 in
1,000 quantities. The CS5571 offers 16-bit resolution, a conversion
rate of 100 kSPS and is priced at $10.29 in quantities of 1,000.
The CS5581 offer 16-bit resolution, a conversion rate of 200 kSPS,
and is priced at $8.45 in quantities of 1,000. The CS5561/70/80
will be available the September quarter. The ICs, which are
currently in volume production, are available in a 24-lead SSOP
package. Cirrus Logic Inc. Cirrus Logic develops high-precision
analog and mixed-signal integrated circuits for a broad range of
consumer and industrial markets. Building on its diverse analog
mixed-signal patent portfolio, Cirrus Logic delivers highly
optimized products for consumer and commercial audio, automotive
entertainment and industrial applications. The company operates
from headquarters in Austin, Texas, with offices in Europe, Japan
and Asia. Cirrus Logic and Cirrus are trademarks of Cirrus Logic
Inc. All other product names noted herein may be trademarks of
their respective holders.
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