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

27

HMC702LP6CE

v10.0812

14 GHz 16-BIT FRACTIONAL-N PLL

Main Serial Port READ Operation

the synthesizer uses the multi-purpose pin, LD_SDO, for both Lock Detect and Serial Data out (SDo) functions. the

Data output pin is muxed with the Lock Detect function. if both of the registers are cleared, then the pin is exclusively

SDo. if automux is enabled, the pin switches to SDo when the rD function is sensed on the 1st rising edge of ScLK.

if lkd_to_sdo_always is set, then the pin LD_SDO is dedicated for Lock Detect only, and it is not possible to read from

the synthesizer.

a typical rEaD cycle is shown in Figure 20.

a. the Master (host) asserts both SEn (Serial Port Enable) and SDi to indicate a rEaD

cycle, followed by a rising edge ScLK

b. the slave (synthesizer) reads SDi on the 1st rising edge of ScLK after SEn. SDi high initiates

the rEaD cycle (rD)

c. Host places the six address bits on the next six falling edges of ScLK, MSB first.

d. Slave registers the address bits on the next six rising edges of ScLK (2-7).

e. Slave places the 24 data bits on the next 24 rising edges of ScK (8-31), MSB first .

f. Host registers the data bits on the next 24 falling edges of ScK (8-31).

g. SEn is de-asserted on or after the 32nd falling edge of ScLK.

h. the 32nd falling edge of ScLK completes the cycle

Figure 20. Serial Port Timing Diagram - READ

REGISTER MAP

Table 5. Reg 00h Chip ID (Read Only) Register

Bit

Type

Name

Width

Default

Description

[23:0]

ro

chip iD

24

581504h

chip iD

Table 6. Reg 00h Strobe (Write Only) Register

Bit

Type

Name

Width

Default

Description

0

Str

global_swrst_regs

1

0

Strobe to soft reset the SPi registers

1

Str

global_swrst_dig

1

0

Strobe to soft reset the rest of digital

2

Str

mcnt_resynch

1

0

reserved

3

Str

tsens_spi_strobe

1

0

Strobe to clock the temperature measurement on

demand

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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

license is granted by implication or otherwise under any patent or patent rights of Analog Devices.

Trademarks and registered trademarks are the property of their respective owners.

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

Phone: 781-329-4700 • Order online at www.analog.com

Application Support: Phone: 1-800-ANALOG-D