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CS5501-AP датащи(PDF) 11 Page - Cirrus Logic

номер детали CS5501-AP
подробное описание детали  Low-Cost, 16 & 20-Bit Measurement A/D Converter
Download  54 Pages
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производитель  CIRRUS [Cirrus Logic]
домашняя страница  http://www.cirrus.com
Logo CIRRUS - Cirrus Logic

CS5501-AP датащи(HTML) 11 Page - Cirrus Logic

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GENERAL DESCRIPTION
The CS5501/CS5503 are monolithic CMOS A/D
converters designed specifically for high resolu-
tion measurement of low-frequency signals. Each
device consists of a charge-balance converter (16-
Bit for the CS5501, 20-Bit for the CS5503),
calibration microcontroller with on-chip SRAM,
and serial communications port.
The CS5501/CS5503 A/D converters perform
conversions continuously and update their output
ports after every conversion (unless the serial port
is active). Conversions are performed and the se-
rial port is updated independent of external
control. Both devices are capable of measuring
either unipolar or bipolar input signals, and cali-
bration cycles may be initiated at any time to
ensure measurement accuracy.
The CS5501/CS5503 perform conversions at a
rate determined by the master clock signal. The
master clock can be set by an external clock or
with a crystal connected to the pins of the on-chip
gate oscillator. The master clock frequency deter-
mines:
1. The sample rate of the analog input signal.
2. The corner frequency of the on-chip digital
filter.
3. The output update rate of the serial output port.
The CS5501/CS5503 design includes several self-
calibration modes and several serial port interface
modes to offer users maximum system design
flexiblity.
The Delta-Sigma Conversion Method
The CS5501/CS5503 A/D converters use charge-
balance techniques to achieve low cost, high
resolution measurements. A charge-balance A/D
converter consists of two basic blocks: an analog
modulator and a digital filter. An elementary ex-
ample of a charge-balance A/D converter is a
conventional voltage-to-frequency converter and
counter. The VFC’s 1-bit output conveys infor-
mation in the form of frequency (or duty cycle),
which is then filtered (averaged) by the counter
for higher resolution.
The analog modulator of the CS5501/CS5503 is a
multi-order delta-sigma modulator. The modulator
consists of a 1-bit A/D converter (that is, a com-
parator) embedded in an analog feedback loop
with high open loop gain (see Figure 1). The
modulator samples and converts the input at a rate
well above the bandwidth of interest. The 1-bit
output of the comparator is sampled at intervals
based on the clock rate of the part and this infor-
mation (either a 1 or 0) is conveyed to the digital
filter. The digital filter is much more sophisticated
than a simple counter. The filter on the chip has a
6-pole low pass Gaussian response which rolls off
at 120 dB/decade (36 dB/octave). The corner fre-
quency of the digital filter scales with the master
clock frequency. In comparison, VFC’s and dual
slope converters offer (sin x)/x filtering for high
frequency rejection (see Figure 2 for a compari-
son of the characteristics of these two filter types).
When operating from a 1 MHz master clock the
digital filter in the CS5501/CS5503 offers better
than 120 dB rejection of 50 and 60 Hz line fre-
quencies and does not require any type of line
synchronization to achieve this rejection. It should
be noted that the CS5501/CS5503 will update its
output port almost at 1000 times per second when
operating from the 1 MHz clock. This is a much
higher update rate (typically by a factor of at least
50 times) than either VFCs or dual-slope convert-
ers can offer.
For a more detailed discussion on the delta-sigma
modulator see the Application note "Delta-Sigma
DAC
Comparator
LP Filter
1-bit
16-bits
Digital Filter
S/H Amp
Figure 1. Charge Balance (Delta-Sigma) A/D Converter
CS5501/CS5503
DS31F2
11


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