CS5516-ASZ Cirrus Logic Inc, CS5516-ASZ Datasheet - Page 24

• Manufacturer Part Number: CS5516-ASZ
• Description: IC ADC 16BIT BRIDGE TRAS 24-SOIC
• Manufacturer: Cirrus Logic Inc

Specifications of CS5516-ASZ

• Number Of Bits: 16
• Sampling Rate (per Second): 60
• Data Interface: Serial
• Number Of Converters: 2
• Power Dissipation (max): 37.5mW
• Voltage Supply Source: Analog and Digital, Dual ±
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 24-SOIC (0.300", 7.50mm Width)
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 598-1101-5

24
pling is shown on the system connection dia-
grams.
If absolute measurements are to be made by the
CS5516/20, then a precision reference should be
input into the VREF+ and VREF- terminals.
Clock Generator
The CS5516/20 includes a gate which can be
connected as a crystal oscillator to provide the
master clock to run the chip. Alternatively, an
external (CMOS compatible) clock can be input
into the XIN pin. Figure 10 illustrates a simple
model for the on-chip gate oscillator. The on-
chip oscillator is designed to typically operate
with crystal frequencies between 4.0 and 5.0
MHz without additional loading capacitors. If
other crystal frequencies, or if ceramic resona-
tors are used, additional loading capacitance may
be necessary.
The XOUT pin can be used to drive one CMOS
gate for system clock requirements. Be sure to
include the gate’s input capacitance and stray ca-
pacitance as part of the loading capacitance for
the resonating element.
Digital Filter
The CS5516/20 is optimized to operate with clock
frequencies of 4.096 MHz or 4.9152 MHz. These
result in the filter having a 3dB bandwidth of 12
Hz or 15 Hz, with output word rates of 50 or
60 Sps. The rejection at 50Hz
mum with a 4.096 MHz clock. Similar rejection is
obtained at 60 Hz with a 4.9152 MHz clock.
24
XIN
22
Figure 10. On-Chip Gate Oscillator Model
1pF
400
5pF
g
m
External XTAL
2000 umhos
>1M
3Hz is 70 dB mini-
To Internal circuitry
5pF
400
XOUT
1pF
23
The digital filter has a deep notch in its transfer
function at 50 Hz (XIN = 4.096 MHz) or 60 Hz
(XIN = 4.9152 MHz) but other XIN frequencies
can be used. The filter transfer function will
scale proportionally. Figure 11 shows the trans-
fer function of the filter when operated at three
different frequencies. With a 3.579 MHz XIN,
the filter offers greater than 90 dB rejection of
both 50 and 60 Hz.
The output word rate of the converter scales
with the XIN clock rate and is set by the ratio of
XIN/81,920; or 50 Sps for XIN = 4.096 MHz. If
very narrow signal bandwidths, such as 3 Hz,
are desired, averaging of the output words is rec-
ommended.
-120
-150
-180
180
150
120
-100
-120
-140
-160
-30
-60
-90
90
60
30
-20
-40
-60
-80
0
0
0
0
0
0
Figure 11. Filter Magnitude Response
21.8
Figure 12. Filter Phase Response.
5
25
30
43.7
10
50
60
15
Input Frequency (Hz)
Input Frequency (Hz)
87.3
100
120
XIN = 4.096 MHz
20
CS5516, CS5520
25
(1) XIN = 3.579 MHz
(2) XIN = 4.096 MHz
(3) XIN = 4.915 MHz
131.0
150
180
30
35
174.7
200
240
40
DS74F2
DS74F1
45
218.5
250
300
50