For price, delivery and to place orders: Hittite Microwave Corporation, 2 Elizabeth Drive, 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

36

HMC702LP6CE

v10.0812

14 GHz 16-BIT FRACTIONAL-N PLL

Table 33. Reg 1Ch Phase Detector CSP Register

Bit

Type

Name

Default

Description

3:0

r/W

pfds_sat_deltan

0

0= cycle Slip Prevention (cSP) disabled

4-bit value to advance or retard phase detector in

Vco cycles if it reaches 2pi , i.e. cycle slip

prevention. 1st bit is polarity, enabled by rstb

4

r/W

pfds_rstb_force

0

cSP PFD Flip-flops rStB:

1 - controlled by the pfds_rstb bit:

0 - auto-controlled by the cSP logic

Forces the PFD into reset, which tri-states

charge pump, freezes charge on the loop filter,

and hence opens the loop. Program 0

5

r/W

pfds_rstb

1

cSP PFD FF rstb

1 - Enables the cycle Slip Prevention (cSP)

feature of the PFD (also need reg 1[15]=1)

Table 34. Reg 1Dh Reserved

Bit

Type

Name

Default

Description

23:0

ro

reserved

0

reserved

Table 35. Reg 1Eh Temperature Sensor Register

Bit

Type

Name

Default

Description

0

r/W

tsens_spi_enable

0

Enable the temperature sensor, draws ~2ma

current, must strobe tsens_spi_strobe reg 00h

<3>

Table 36. Reg 1Fh LD, VCO & Ramp Busy Read Only Register

Bit

Type

Name

Default

Description

0

ro

ro_lock_detect

0

1 = locked, 0 = unlocked

3:1

ro

ro_dsm_overflow

0

1 = modulator overflow

4

ro

reserved

0

reserved

5

ro

ro_ramp_busy

0

Sweeper status flag, set when ramp is busy,

cleared when at end of ramp or not used

Table 37. Reg 20h Reserved

Bit

Type

Name

Default

Description

23:0

ro

reserved

20h

reserved

Table 38. Reg 21h Temperature Sensor Read Only Register

Bit

Type

Name

Default

Description

6:0

ro

tsens_temperature

1Fh

current temperature from temp sensor

lsb = 17.5°c

0000111 = temp >= 82.5°c

0000110 = temp

0000000 = temp <=-22.5°c

tsens_temperature = floor ((temp+40)/17.5)

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