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

Phone: 978-250-3343

Fax: 978-250-3373

Order On-line at www.hittite.com

Application Support: Phone: 978-250-3343 or apps@hittite.com

30

HMC701LP6CE

v09.1112

8 GHz 16-BIT FRACTIONAL-N PLL

Table 14. Reg 03h Reference Path Register

Bit

Type

Name

Default

Description

13:0

r/W

rfp_div_ratio

also referred to as ‘r’

1

Divides the crystal input by this number ‘r’ if

rfp_div_en=1 and rfp_div_select = 1

rfp_div_ratio = 0 not allowed

2<=div_ratio<=2^14

see Figure 4

14

r/W

rfp_div_select

0

1 = reference divider enabled

0 = bypass ref divider

see Figure 4

15

r/W

rfp_auto_refdiv_sel_en

1

1 = auto ref divider enable or bypass is automatic

if rfp_div_ratio = 1, bypass divider

if rfp_div_bypass ~=1 use divider

see Figure 4

16

r/W

rfp_buf_sin_sel

0

Selects sine wave reference for normal operation

see Figure 4

Table 15. Reg 04h Prescaler Duty Cycle Register

Bit

Type

Name

Default

Description

0

r/W

vcop_dutycycmode

0

Extends the low time from 15 to 47 Vco cycles

for large divide ratios. Program 0

Table 16. Reg 05h Phase Freq Detector Register (pfd)

Bit

Type

Name

Default

Description

0

r/W

pfd_phase_sel

0

inverts PFD Polarity

0 = Passive Filter +ve slope Vco

1 = Passive Filter -ve slope Vco

1 = active inverting filter, +ve slope Vco

0 = active inverting filter, -ve slope Vco

1

r/W

pfd_upout_en

1

allows masking of the up outputs between PFD

and cP

2

r/W

pfd_dnout_en

1

allows masking of the dn outputs between PFD

and cP

Table 17. Reg 06h Phase Freq Detector Delay Register

Bit

Type

Name

Default

Description

2:0

r/W

pfd_del_sel

2h

Delay line setpoint to PFD Program 001

Table 18. Reg 07h Charge Pump UP/DN Control Register

Bit

Type

Name

Default

Description

4:0

r/W

cp_UPcurrent_sel

10h

Sets charge-Pump Up gain, 125ua lsb, binary,

4ma max. Program as needed

9:5

r/W

cp_Dncurrent_sel

10h

Sets charge-Pump Dn gain, 125ua lsb, binary,

4ma max. Program as needed

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