CRD-5381 Cirrus Logic Inc, CRD-5381 Datasheet - Page 11

• Manufacturer Part Number: CRD-5381
• Description: Audio Modules & Development Tools Ref Bd high perfm ADC & SRC
• Manufacturer: Cirrus Logic Inc

Specifications of CRD-5381

• Description/function: Audio A/D
• Operating Supply Voltage: 3.3 V
• Product: Audio Modules
• For Use With/related Products: CS5381, CS8421
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

DS563RD1
2.6
2.7
2.8
WARNING: Please refer to the CS5381 and CS8421 data sheet for allowable voltage levels.
Analog Inputs
The CRD5381 provides four fully differential analog inputs via J9, J11, J7, and J12; shown in
Figure
The input buffer to each CS5381 device has unity gain, and the CRD5381 differential input amplitude re-
quired to generate a full-scale digital output is typically 5.65 Vpp.
If extra analog input circuitry is required in the user’s design, it should drive a buffer equivalent to the con-
tents of the dotted boxes shown in
this case, all components outside the dotted boxes in
design.
Power
The CRD5381 requires the user to supply +3.3 V (J6) and ±12 V (J2 and J1) to the board. Onboard regula-
tors supply the required +5 V and +2.5 V. All voltage inputs must be referenced to the single black banana-
type ground connector (J5). Zener Diodes Z1 and Z2 (shown in
circuitry from accidental connection of a reversed polarity supply or a supply of over ± 13 V to J1 and J2.
Grounding and Power Supply Decoupling
The CS5381 and CS8421 require careful attention to power supply and grounding arrangements in order
to optimize performance.
shows the component placement.
ure 18
cated as close to the CS5381 and CS8421 as possible. Extensive use of ground plane fill in the evaluation
board yields large reductions in radiated noise.
10. Each analog input has the required analog circuitry to optimize the performance of each CS5381.
shows the power plane, and
Figure 7. Status Indicator and Reset Header, J16
Figure 8
SRC UNLOCK A
SRC UNLOCK B
Figure 16
Figure 9
provides an overview of the connections on the CRD5381;
OVERFLOW A
OVERFLOW B
Figure 19
RESET
and in
shows the top layout,
shows the ground plane. The decoupling capacitors are lo-
Signal
Figure 10
J16
Figure 9
Ground
labeled “CS5381 Required Input Circuitry”. In
Figure
and
Figure 17
Figure 10
14) are used to protect the CRD5381
shows the bottom layout,
should be removed from the
CRD5381
Figure 9
Figure 15
Fig-
and
11