HMC703LP4E datasheet(39/58 Pages) AD

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HMC703LP4E

v02.0813

8 GHz fractional syntHesizer

For price, delivery and to place orders: Hittite Microwave Corporation, 2 Elizabeth Drive, Chelmsford, MA 01824

978-250-3343 • 978-250-3373 fax • Order On-line at www.hittite.com

Application Support: pll@hittite.com

table 8. register 0 comparison - single vs Multi-User Modes

single User

HMC Mode

single Or Multi-User

Open Mode

READ

Chip ID

24 Bits

Chip ID

24Bits

WRITE

soft Reset,

General strobes

Read Address [4:0]

soft reset [5]

General strobes [24:6]

serial Port Mode Decision after Power-on reset

On power up, both types of modes are active and listening. All digital IO must be low at power-up.

A decision to select the desired serial Port mode (protocol) is made on the first occurrence of sEN or sCK , after which

the serial Port mode is fixed and only changeable by a power down.

a. If a rising edge on sEN is detected first HMC Mode is selected.

b. If a rising edge on sCK is detected first Open mode is selected.

serial Port HMc Mode - single Pll

HMC Mode (Legacy Mode) serial port operation can only address and communicate with a single PLL, and is compat-

ible with most HMC PLLs and PLLs with integrated VCOs.

The HMC Mode protocol for the serial port is designed for a 4 wire interface with a fixed protocol featuring

a. 1 Read/Write bit

b. 6 Address bits

c. 24 data bits

serial Port open Mode

The serial Port Open Mode features:

a. Compatibility with general serial port protocols that use a shift and strobe approach to

communication.

b. Compatible with HMC multi-Chip solutions, useful to address multiple chips of various types from a

single serial port bus.

The HMC Open Mode protocol has the following general features:

a. 3 bit chip address, can address up to 8 devices connected to the serial bus ( = 000 on

HMC703LP4E)

b. Wide compatibility with multiple protocols from multiple vendors

c. simultaneous Write/Read during the sPI cycle

d. 5 bit register address space

e. 3 wire for Write Only capability, 4 wire for Read/Write capability.

HMC RF PLLs with integrated VCOs also support HMC Open Mode. HMC700, HMC701, HMC702 and some genera-

tions of microwave PLLs with integrated VCOs do not support Open Mode.

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

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