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CS5550-IS Datasheet(PDF) 11 Page - Cirrus Logic

No. de pieza CS5550-IS
Descripción Electrónicos  Two-channel, Low-cost A/D Converter
Download  24 Pages
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Fabricante Electrónico  CIRRUS [Cirrus Logic]
Página de inicio  http://www.cirrus.com
Logo CIRRUS - Cirrus Logic

CS5550-IS Datasheet(HTML) 11 Page - Cirrus Logic

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CS5550
DS630F1
11
This linearity is guaranteed for all available
full-scale input voltage ranges.
Note that until the CS5550 is calibrated (see Cali-
bration) the accuracy of the CS5550 is not guaran-
teed to within ±0.1%. But the linearity of any given
sample of CS5550, before calibration, will be within
±0.1% of reading over the ranges specified, with
respect to the input voltage levels required to
cause full-scale readings in the FILT Registers. Ta-
ble 2 describes linearity + variation specs after the
completion of each successive computation cycle.
3. FUNCTIONAL DESCRIPTION
3.1 Analog Inputs
The CS5550 has two available full-scale differen-
tial input voltage ranges for AIN1±.
The input ranges are the maximum sinusoidal sig-
nals that can be applied to the analog inputs, yet
theses values will not result in full scale registra-
tion.
If the analog inputs are set to 500 mVP-P, only a
250 mVRMS signal will register full scale. Yet it
would not be practical to inject a sinusoidal signal
with a value of 250 mVRMS. When such a sine
wave enters the higher levels of its positive crest
region (over each cycle), the voltage level of this
signal exceeds the maximum differential input volt-
age range of the input channels. The largest sine
wave voltage signal that can be placed across the
inputs, with no saturation is:
which is ~70.7% of full-scale. So for sinusoidal in-
puts at the full scale peak-to-peak level the full
scale registration is ~.707.
3.2 Voltage Reference
The CS5550 is specified for operation with a
+2.5 V reference between the VREFIN and AGND
pins. The converter includes an internal 2.5 V ref-
erence (25 ppm/°C drift) that can be used by con-
necting the VREFOUT pin to the VREFIN pin of the
device. If higher accuracy/stability is required, an
external reference can be used.
3.3 Oscillator Characteristics
XIN and XOUT are the input and output of an in-
verting amplifier to provide oscillation and can be
configured as an on-chip oscillator, as shown in
Figure 2. The oscillator circuit is designed to work
with a quartz crystal or a ceramic resonator. To re-
duce circuit cost, two load capacitors C1 and C2
are integrated in the device. With these load ca-
pacitors, the oscillator circuit is capable of oscilla-
tion up to 20 MHz. To drive the device from an
external clock source, XOUT should be left uncon-
nected while XIN is driven by the external circuitry.
There is an amplifier between XIN and the digital
section which provides CMOS level signals. This
amplifier works with sinusoidal inputs so there are
no problems with slow edge times.
The CS5550 can be driven by an external oscillator
ranging from 2.5 to 20 MHz, but the K divider value
must be set such that the internal DCLK will run
somewhere between 2.5 MHz and 5 MHz. The K
divider value is set with the K[3:0] bits in the Con-
figuration Register. As an example, if XIN = MCLK
= 15 MHz, and K is set to 5, then DCLK is 3 MHz,
which is a valid value for DCLK.
2
2
500mV
P-P
= ~176.78mV
RMS
Oscillator
Circuit
DGND
XIN
XOUT
C1
C1 =
22 pF
C2
C2 =
Figure 2. Oscillator Connection


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