cs5317 Cirrus Logic, Inc., cs5317 Datasheet - Page 27

• Manufacturer Part Number: cs5317
• Description: 16-bit, 20 Khz Oversampling A/d Converter
• Manufacturer: Cirrus Logic, Inc.

amplitude so that distortion products become neg-
ligible. This allows an accurate measurement of
the noise floor.
More complex analysis such as intermodulation
distortion measurements can be accomplished
with the addition of another sine-wave generator.
CIRCUIT DESCRIPTION
Figure 2 illustrates the CS5317 A/D converter IC
circuit connections. The chip operates off of 5V.
These voltages are supplied from a power source
external to the evaluation board. Binding posts
CLKIN
DS27DB3
GND
+5V
AIN
-5V
6.8v
V L
TP10
D3
TP9
* Remove for logic gate CLKIN source
R1*
51
TP6
R2
200
D1
R11
1.2k
C19
TP7
0.1 F
CLKIN (fig.6)
C5
C18
0.01 F
NPO
D2
6.8v
C17
0.22 F
R10
10k
C4
TP8
10 F
C16
10 F
Figure 2. Analog-to-Digital Converter
C9
10 F
C15
0.1 F
0.1 F
V L
C14
C8
0.1 F
12
11
17
18
15
9
PHDT
VCOIN
CLKIN
REFBUF
AGND
AIN
14
VA+
1
VA-
are supplied on the board to connect the +5, -5,
and ground power lines. A good quality low rip-
ple, low noise supply will give the best
performance. The +5 V supply can also be used
for VL and should be connected between the VL
board jack and the power supply, as opposed to
connecting the VL jack straight to the +5V jack.
The +5V jack is the positive power source for the
CS5317 IC whereas the VL jack supplies power
to all the digital ICs. Care should be taken that
noise is not coupled between VL and +5V; how-
ever, supply noise is generally not a problem with
the CS5317 since the on-chip decimation filter
will remove any interference outside of its pass-
band. The +5 and -5 V supply lines are filtered on
CS5317
R7
10
U6
R8
10
CLKOUT
VD-
VD+
MODE
DGND
DOUT
DATA
DOE
RST
10
2
16
C13
3
7
4
8
5
6
+
0.1 F
C6
10 F
C12
10 k
R9
10 k
R5
CLKG1
CLKG2
CLKOR
+
10 F
C7
0.1 F
R6
10 k
P2
CDB5317
DOUT
CLKOUT
DATA
(fig. 3)
(fig. 3)
(fig. 3)
27