CDB61884 datasheet(5/22 Pages) CIRRUS

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CDB61884

DS485DB1

2. BOARD COMPONENT DESCRIPTIONS

2.1

Power Connections

Power for the evaluation board is supplied by an

external +3.3 V DC power supply. A +5 V DC

power supply can also be connected to the on-board

control logic. The LED labeled “D3” will illumi-

nate when power is supplied to the on-board con-

trol logic.

– Connect the +3.3 VDC power supply to the +3V

binding post and the +5 VDC power supply to

the +5 V binding post if 5 Volt logic is required

– Jumper J13 shown in Figure 2 allows all the

external logic on the evaluation board to be

connected to either +3 V or +5 V binding post.

– To measure the current consumption of only

the CS61884 device, place a short block on

Jumper J13 to connect the Vlogic power

supplies to the +5 V binding post. This will

isolate the CS61884 device from all the on-

board logic, to allow the current measurement

to be made at the +3 V binding post.

2.2

Master Clock Selection

In both hardware and host modes, the MCLK pin is

configured by placing a short block on one of the

positions of bed stake header J1. Figure 3 shows

the different positions of the J1 bed stake header.

– A 2.048 MHz clock oscillator is provided on the

evaluation board for use as the on-board clock

source for all E1 modes.

– A 1.544 MHz clock oscillator is also provided

with the evaluation board for use as the on-

board clock source for the T1/J1 operation

modes.

– A BNC connector (labeled J16) provides the

connection for an external clock source.

J1 3

O n -board lo g ic c onnec te d

to +3 V b inding pos t

O n -board lo g ic c onnec te d

to +5 V b in d ing pos t

VL O G IC

J1 3

VL O G IC

Figure 2. On-board Logic Power Selection

MCLK

Data Recovery Mode

MCLK

External Clock Source

Receivers Powered Down

On-board Oscillator

MCLK

Figure 3. Master Clock Selections

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