HMC703LP4E Datasheet, PDF (39/58 Pages) Hittite Microwave Corporation – 8 GHZ FRACTIONAL SYNTHESIZER

v02.0813
HMC703LP4E
8 GHz fractional synthesizer
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]
6 - 39
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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