Clock Generation; Low Power Clock Phase-Lock Loop (Lp Clkpll) - Analog Devices ADRV9005 Reference Manual

Reference Manual

CLOCK GENERATION

In the ADRV9001, the CLKGEN generates all clocks for the converters and main digital. CLKGEN receives from two clocks, a high performance
(HP) clock PLL and low power (LP) clock PLL. The high performance clock PLL has a programmable frequency range of 7.2 GHz to 8.8 GHz.
The low power clock PLL can generate a programmable frequency range of 3.3 GHz to 5 GHz. CLKGEN also has the clocks divided and
retimed with reset pulses from the clock PLLs.

LOW POWER CLOCK PHASE-LOCK LOOP (LP CLKPLL)

By default, LP CLKPLL works at a fixed frequency 4423.68 MHz. However, it can be set to a tuning operation range. The operating frequency
range of LP CLKPLL is from 3.3 GHz to 5 GHz. Provide the final sampling frequency only at the interface, and the final frequency of LP
CLKPLL is determined internally, all before the chip is programmed. A profile is generated based on the provided sampling frequency.
Note that LP CLKPLL uses less power than HP CLKPLL but has a smaller tuning range, which cannot be used for some profiles.
the supported data sample rates with different standards by LP CLKPLL.
the LTE 40 MHz at 16-bit is not supported by the LP CLKPLL.
Table 40. Sample Rate Supported by LP CLKPLL
Standard
DMR I/Q
TETRA
TETRA
LTE 1.5
LTE 3
LTE 5
LTE 10
LTE 15
LTE 20
LTE 40 at12 bits
Table 41. Supported Data Lane Rate by LP CLKPLL
Standard
DMR/P25 Direct Modulation
P25 Direct Modulation
FM Direct Modulation
DMR I/Q
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Figure 85 shows that the CLKPLL can be programmed to provide arbitrary sample rate.
Figure 84. ADRV9001 Clock Generation
Figure 85. CLKPLL Can Be Programmed to Provide Arbitrary Sample Rate
Serialization Factor Per Data Lane
2
2
16
32
8
Table 41 lists the supported data lane rate by LP CLKPLL. Note that
Sample Rate
2.40E + 04
1.44E + 05
2.88E + 05
1.92E + 06
3.84E + 06
7.68E + 06
1.54E + 07
2.30E + 07
3.07E + 07
6.14E + 07
Data Lane Rate
9.60E +03
1.20E +04
1.28E +05
7.68E + 05
1.92E + 05
ADRV9001
Table 40 lists
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