HMC701LP6CE datasheet(33/40 Pages) AD

33 / 40 page

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Phone: 978-250-3343

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HMC701LP6CE

v09.1112

8 GHz 16-BIT FRACTIONAL-N PLL

Table 29. Reg 12h Delta Sigma Modulator Register

Bit

Type

Name

Default

Description

r/W

dsm_ref_clk_select

use reference instead of divider Program 0

r/W

dsm_invert_clk_sd3

invert Δ∑ clk

r/W

dsm_invert_clk_rph

inverts the ref clock phase

r/W

dsm_integer_mode

1- enables integer Mode, bypasses the Δ∑

modulator, leaves it running

see also dsm_rstb reg01h<13> to disable the

modulator

r/W

reserved

r/W

reserved

r/W

dsm_xref_sin_select

when xref is selected specifies that the sine

source is used

r/W

dsm_autoseed

automatic seed load when changing the frac

part, uses value in seed

9:8

r/W

dsm_order

Delta-Sigma Modulator configuration:

00-1st order 01-2nd order 10-3rd order Feedback

11-3rd order Feedforward

Use either 10 or 11. For Sweeper operation use

11 only.

Do not use 1st or 2nd order (for test only)

13:10

r/W

dsm_quant_max

max value allowed out of Δ∑ modulator quantizer

limits are +7 to -8, typ ±3 or ±4 Program 3h

17:14

r/W

dsm_quant_min

min value allowed out of Δ∑ modulator quantizer

limits are +7 to -8, typ ±3 or ±4 Program ch

Table 30. Reg 14h CW Sweep Control Register

the maximum sweep range is limited to 255 x Fxtal/r. Delta-Sigma Modulator mode should be Feed

Forward when using Sweep feature (register 12h Bits [9:8] = 11.

Bit

Type

Name

Default

Description

r/W

clear_ovf_undf

asynchronous clear for ovf/undf flags

r/W

ramp_enable

ramp En/rstb

1= enables the cW ramp Function

r/W

ramp_trigg

Write always triggers ramps if bit <2> = 0, if bit

<2> = 1, ramp will not trigger, bit <2> must be

reset to 0 first

r/W

ramp_repeat_en

ramp repeat Seq enable

1= enables autotrigger of ramps

0 = ramp_trigg starts each ramp

r/W

ramp_startdir_dn

ramp start direction

1= Start with ramp Down

0= Start with ramp Up

r/W

ramp_trig_ext_en

Enable hardware trigger on GPo3 pin

r/W

ramp_singlestep

ramp single step, advances the ramp to the next

step, and holds frequency

r/W

ramp_singledir

ramps in one direction only with hop to start at

end of ramp

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