AN035 The CS5504 Family Characteristics

AN35
Application Note
The CS5504 Family Characteristics
Table 1 summarizes the similarities
differences of the CS5504 family.
The CS5504/5/6/7/8/9 are a series of A/D
converters all derived from a high performance
∆Σ architecture. The CS5504 family members
are based on a core architecture including both
an analog modulator and a digital filter, with
only subtle differences between the individual
products. The digital filter has been optimized
to attenuate ac line interference (50/60 Hz and
their harmonics) when the devices are operated
from a low-cost 32.768kHz crystal.
The CS5504/9 come in smaller packages than
the CS5505/6/7/8, however, the CS5505/6/7/8
have more functionality and flexibility. The
CS5505/6/7/8 offer a sleep function, an on-chip
voltage
reference,
and
multiple
serial
communication modes.
Table 2 shows the CS5504 family’s wide array
of power supply options. Note: the CS5509 is
single supply, however, the VA+ supply for all
devices must always be the most positive
operating voltage under all operating conditions,
including start-up.
The use of a low-cost 32.768kHz clock provides
20 samples per second from the family. The
CS5505/6/7/8 can achieve up to 100
samples/second with a 163kHz system clock, while
the CS5504/9 can achieve up to 200
samples/second when operated from it’s maximum
input clock of 330 kHz. In achieving higher
conversion rates, the CS5504 requires slightly
higher operating currents than the CS5505/6/7/8.
The CS5509 achieves the same high conversion
rate as the CS5504 with lower power consumption,
but pays a slight penalty in linearity.
CS5504
CS5505
CS5506
CS5507
CS5508
CS5509
Max.
Resolution #Channels Speed3
20-bits
21
200
16-bits
42
100
20-bits
42
100
1
16-bits
1
100
20-bits
11
100
16-bits
11
200
and
CS5504/5/
6/7/8
CS5509
VA+
+5 to +10V
+5V
+5V
+5V
+5V
VA0V
0 to -5V
0 to -5V
-
VD+
+5V
+5V
+3.3V
+5V
+3.3V
Table 2. Power Supply Arrangements
4
Linearity
(Typical)
0.0007%
0.0015%
0.0007%
0.0015%
0.0007%
0.0015%
Sleep Power
No
4.4 mW
Yes
3 mW
Yes
3 mW
Yes
3 mW
Yes
3 mW
No
1.7 mW
On-chip Serial Port
VREF
Modes5 Pin Count
No
SEC
20
Yes
SEC, SSC
24
Yes
SEC, SSC
24
Yes
SEC, SSC
20
Yes
SEC, SSC
20
No
SEC
16
Table 1. CS5504 Family Characteristics
Notes: 1. Fully-differential
2. Pseudo-differential
3. CS5509 is production tested at 330 kHz (200 samples/second)
All others are production tested at 32.768 kHz for the best 50/60 Hz rejection.
4. These linearity specifications are based on a 20Hz output rate using a 32.768kHz crystal.
5. SEC is synchronous external clocking of the data out while SSC is synchronous self-clocking.
Crystal Semiconductor Corporation
P.O. Box 17847, Austin, TX 78760
(512) 445-7222 FAX 445-7581
http://www.crystal.com
Copyright  Crystal Semiconductor Corporation 1996
(All Rights Reserved)
JAN ’95
AN35REV2
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