CS5339 View Datasheet(PDF) - Cirrus Logic

Part Name

Description

MFG CO.

CS5339

16-Bit, Stereo A/D Converters for Digital Audio

Cirrus Logic 

CDB5336,8,9

Power Supply Circuitry

The schematic diagram in Figure 1 shows the

evaluation board power supply circuitry. Power

is supplied to the evaluation board by five bind-

ing posts. The ±5 Volt analog power supply

inputs of the converter are derived from ±15

Volts using the voltage regulators U10 and U11.

The +5 Volt digital supply for the converter and

the discrete logic on the board is provided by the

+5V and DGND binding posts. D1, D2 and D4

are transient suppressors which also provide pro-

tection from incorrectly connected power supply

leads. C25-C28, C30 and C31 provide general

power supply filtering for the analog supplies.

As shown in Figure 2, C10-C13 provide local-

ized decoupling for the converter VA+ and VA-

pins. Note that C13 is connected between VA-

and VA+ and not VA- and AGND. Space for a

ferrite bead inductor, L1, has been provided so

that the board may be modified to power the

converter’s VD+ input directly from the VA+

supply. Note that the trace connecting the VD+

power to the VD+ of the converter must be bro-

ken before L1 may be installed. R5 and C7 low-

pass filter the analog logic power supply pin,

VL+. The evaluation board uses both an analog

and a digital ground plane which are connected

at a single point by J1. This ground plane ar-

rangement isolates the board’s digital logic from

the analog circuitry.

Offset Calibration & Reset Circuit

Figure 1, shows the optional offset calibration

circuit provided on the evaluation board. Upon

power-up, this circuit provides a pulse on the

Analog-to-Digital Converter’s DPD pin initiating

an offset calibration cycle. Releasing SW1 also

initiates an offset calibration cycle. P6 (see Fig-

ure 2) selects the signal source used during

offset calibration. In the "AIN" position, the

AINL and AINR inputs are selected during cali-

bration, while in the "ZERO" position, the

ZEROL and ZEROR inputs are selected.

+15V

AGND

-15V

+5V

DGND

D2 + C30

47 uF

IN

C25

0.22 uF

U10

78L05 OUT

COM

+ C31

D4 47 uF

C26

0.22 uF

IN

D2 = D4 = 1N6276A 1.5KE

D1 = P6KE-6V8P from Thomson

COM

79L05 OUT

U11

+ C8

D1

47 uF

VD+

C9

0.1 uF

D3

1N4148

SW1

CAL

C27

0.47 uF

VA+

J1

C28

0.47 uF

AGND

DGND

VA-

9

8

RST

CS8402

VD+

U7E

0.1uF

C15

R26

10k

11

10

U7D

Cal

(DPD CS5336)

Figure 1. Power Supply and Reset Circuitry

DS23DB5

3-61

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