LMK03000CISQ/NOPB National Semiconductor, LMK03000CISQ/NOPB Datasheet - Page 14

• Manufacturer Part Number: LMK03000CISQ/NOPB
• Description: IC CLOCK CONDITIONER PREC 48-LLP
• Manufacturer: National Semiconductor
• Type: Clock Conditionerr

Specifications of LMK03000CISQ/NOPB

• Pll: Yes
• Input: Clock
• Output: LVDS, LVPECL
• Number Of Circuits: 1
• Ratio - Input:output: 1:8
• Differential - Input:output: Yes/Yes
• Frequency - Max: 1.296GHz
• Divider/multiplier: Yes/No
• Voltage - Supply: 3.15 V ~ 3.45 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 48-LLP
• Frequency-max: 1.296GHz
• For Use With: LMK03000CEVAL - BOARD EVALUATION LMK03000C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: LMK03000CISQ; LMK03000CISQTR

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2.0 General Programming
Information
The LMK03000 family of devices are programmed using sev-
eral 32-bit registers which control the device's operation. The
registers consist of a data field and an address field. The last
4 register bits, ADDR[3:0] form the address field. The remain-
ing 28 bits form the data field DATA[27:0].
During programming, LEuWire is low and serial data is
clocked in on the rising edge of CLKuWire (MSB first). When
LE goes high, data is transferred to the register bank selected
by the address field. Only registers R0 to R7, R11, and R13
to R15 need to be programmed for proper device operation.
For the frequency calibration algorithm to work properly OS-
Cin must be driven by a valid signal when R15 is programmed.
Any changes to the PLL R divider or OSCin require R15 to be
programmed again to activate the frequency calibration rou-
tine.
2.1 RECOMMENDED PROGRAMMING SEQUENCE
The recommended programming sequence involves pro-
gramming R0 with the reset bit set (RESET = 1) to ensure the
device is in a default state. It is not necessary to program R0
again, but if R0 is programmed again, the reset bit is pro-
grammed clear (RESET = 0). Registers are programmed in
order with R15 being the last register programmed. An ex-
ample programming sequence is shown below.
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Program R0 with the reset bit set (RESET = 1). This
ensures the device is in a default state. When the reset bit
is set in R0, the other R0 bits are ignored.
— If R0 is programmed again, the reset bit is programmed
Program R0 to R7 as necessary with desired clocks with
appropriate enable, mux, divider, and delay settings.
Program R8 for optimum phase noise performance.
Program R9 with Vboost setting if necessary. Optional,
only needed to set Vboost = 1.
Program R11 with DIV4 setting if necessary.
Program R13 with oscillator input frequency and internal
loop filter values
Program R14 with Fout enable bit, global clock output bit,
power down setting, PLL mux setting, and PLL R divider.
Program R15 with PLL charge pump gain, VCO divider,
and PLL N divider. Also starts frequency calibration
routine.
clear (RESET = 0).
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