HMC701LP6CE datasheet(33/40 Pages) AD

33 / 40 page

For price, delivery and to place orders: Hittite Microwave Corporation, 20 Alpha Road, Chelmsford, MA 01824

Phone: 978-250-3343

Fax: 978-250-3373

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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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responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other

rights of third parties that may result from its use. Specifications subject to change without notice. No

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One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106

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