ACS8525AP datasheet(29/112 Pages) SEMTECH

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ACS8525A LC/P

ADVANCED COMMS & SENSING

FINAL

DATASHEET

Revision 1.00/September 2007 © Semtech Corp.

Page 29

www.semtech.com

“Digital” Frequencies

Table 11, “O1 and O2 Output Frequency Selection,” lists

Digital1 and Digital2 as available for selection. Digital1 is

a single frequency selected from the range shown in

Table 12. Digital2 is another single frequency selected

from the same range.

Using Output O2 to Control Pulse Width of 2/8 kHz on FrSync,

MFrSync and 01 Outputs

It can be seen from Table 11 (01 and 02 Output

Frequency Selection) that frequencies listed as 2 kHz and

8 kHz can be selected. Whilst the FrSync and MFrSync

outputs are always supplied from DPLL1, the 2 kHz and

8 kHz options available from the O1 and O2 outputs are

all supplied via DPLL1 or DPLL2 (Reg. 7A Bit 7).

The outputs can be either clocks (50:50 mark-space) or

pulses, and can be inverted. When pulse configuration is

used, the pulse width will be one cycle of the rate selected

on Output O2 (Output O2 must be configured to generate

at least 1,544 kHz to ensure that pulses are generated

correctly). Figure 7 shows the various options with the

8 kHz controls in Reg. 7A. There is an identical

arrangement with Reg. 7A Bits [1:0] for the 2 kHz 01 and

MFrSync outputs. Outputs FrSync and MFrSync can be

disabled via Reg. 63 Bits [7:6].

Figure 7 Control of 8k Options.

Table 12 Digital Frequency Selections

Digital1 Control

Reg. 39 Bits [5:4]

Digital1 SONET/

SDH Reg. 38 Bit5

Digital1 Freq. (MHz)

Digital2 Control

Reg. 39 Bits[7:6]

Digital2 SONET/SDH

Reg. 38 Bit6

Digital2 Freq. (MHz)

2.048

4.096

8.192

16.384

1.544

3.088

6.176

12.352

F8525_016outputoptions8k_01

02 Output

FrSync at 8 kHz, or

Output 01 at 8kHz

FrSync at 8 kHz, or

Output 01 at 8kHz

FrSync at 8 kHz, or

Output 01 at 8kHz

FrSync at 8 kHz, or

Output 01 at 8kHz

a) Clock non-inverted, Reg.7A[3:2] = 00

b) Pulse non-inverted, Reg.7A[3:2] = 01

c) Clock inverted, Reg.7A[3:2] = 10

d) Pulse inverted, Reg.7A[3:2] = 11

02 Output

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