LMK03806：超低抖动时钟发生器技术资料

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"TI-LMK03806.pdf" TI-LMK03806是一款高性能、超低抖动的时钟发生器，专为需要精确时钟信号的各种应用而设计。这款器件拥有14个可编程输出，能够提供LVDS、LVPECL和CMOS等不同格式的信号，满足各种系统接口的需求。它支持多达8个独特的输出频率，可以在广泛的频率范围内灵活配置。该时钟发生器的一大特点是其低抖动性能。在1.875MHz到20MHz的输出频率范围内，抖动小于50fs；而在12kHz到20MHz的范围内，抖动小于150fs。这使得LMK03806在对时钟精度要求极高的应用中表现出色，例如在SONET/SDH、千兆以太网、光纤通道、无线通信的基带单元(BBU)、GPON OLT/ONU以及高速串行接口如PCIe、XAUI、SATA、SAS等场景下。 LMK03806可以从低成本的晶体或外部时钟源生成多个时钟，通过内置的可编程分频器实现。其内部的可调VCO（压控振荡器）频率范围为2.37GHz到2.6GHz，这意味着它可以生成非常宽范围的时钟频率。此外，它的工作电压范围为3.15V至3.45V，并且能在工业温度范围内稳定工作，支持-40°C到85°C的环境。在应用层面，LMK03806适用于数据转换器（如ADC和DAC）的时钟源，以及数字信号处理（DSP）、微处理器和现场可编程门阵列（FPGA）的时钟需求。它的高灵活性和卓越的抖动性能确保了在这些系统中信号的准确性和可靠性。在技术支持方面，用户可以访问TI的官方网站获取技术文档、工具软件以及社区支持。TI-LMK03806的数据手册（SNAS522）提供了详细的电气特性、引脚配置、操作指南和应用电路示例，有助于工程师进行设计和集成。 TI-LMK03806是针对高精度、低抖动时钟需求的理想解决方案，尤其适用于那些对时钟质量有着严苛要求的通信和数据处理应用。其出色的性能指标和丰富的功能集，使其成为系统设计中的可靠选择。

LMK03806

ZHCSHU9J –SEPTEMBER 2011–REVISED MARCH 2018

www.ti.com.cn

Electrical Characteristics (continued)

3.15 V ≤ V

≤ 3.45 V, -40 °C ≤ T

≤ 85 °C, Junction Temperature T

≤ 125 ° C.

Typical values represent most likely parametric norms at V

= 3.3 V, T

= 25 °C, at Recommended Operating Conditions at

the time of product characterization and are not ensured.

(1)

PARAMETER TEST CONDITIONS MIN TYP MAX UNIT

(14) Maximum Allowable Temperature Drift for Continuous Lock is how far the temperature can drift in either direction from the value it was

at the time that the R30 register was last programmed, and still have the part stay in lock. The action of programming the R30 register,

even to the same value, activates a frequency calibration routine. This implies the part will work over the entire frequency range, but if

the temperature drifts more than the maximum allowable drift for continuous lock, then it will be necessary to reload the R30 register to

ensure it stays in lock. Regardless of what temperature the part was initially programmed at, the temperature can never drift outside the

frequency range of -40 °C to 85 ° C without violating specifications.

(15) Equal loading and identical clock output configuration on each clock output is required for specification to be valid.

(16) Refer to typical performance charts for output operation performance at higher frequencies than the minimum maximum output

frequency.

|ΔT

Allowable temperature drift for

continuous lock

(14) (5)

After programming R30 for lock, no

changes to output configuration are

permitted to guarantee continuous

lock

125 °C

L(f)

Phase noise

(Assumes a very narrow loop

bandwidth)

10-kHz Offset –87 dBc/Hz

100-kHz Offset –112 dBc/Hz

1-MHz Offset –133 dBc/Hz

CLOCK SKEW

SKEW

Maximum CLKoutX to CLKoutY

(15) (5)

LVDS-to-LVDS, T = 25 °C,

CLK

= 800 MHz, R

= 100 Ω

AC coupled

30 ps

LVPECL-to-LVPECL,

T = 25 ° C,

CLK

= 800 MHz, R

= 100 Ω

emitter resistors =

240 Ω to GND

AC coupled

30 ps

Maximum skew between any two

LVCMOS outputs, same CLKout or

different CLKout

(15) (5)

= 50 Ω, C

= 5 pF,

T = 25 ° C, F

CLK

= 100 MHz.

(15)

100 ps

Mixed

SKEW

LVDS or LVPECL to LVCMOS

Same device, T = 25 °C,

250 MHz

750 ps

LVDS CLOCK OUTPUTS (CLKoutX), CLKoutX_TYPE = 1

CLKout

Operating frequency

(5) (16)

= 100 Ω 1300 MHz

Differential output voltageFigure 6

T = 25 ° C, DC measurement

AC-coupled to receiver input

R = 100-Ω differential termination

250 400 450 |mV|

500 800 900 mVpp

ΔV

Change in magnitude of V

for

complementary output states

–50 50 mV

Output offset voltage 1.125 1.25 1.375 V

ΔV

Change in V

for complementary

output states

35 |mV|

/ T

Output rise time 20% to 80%, R

= 100 Ω 200 ps

Output fall time 80% to 20%, R

= 100 Ω 200 ps

Output short circuit current - single-

ended

Single-ended output shorted to

GND, T = 25 °C

–24 24 mA

SAB

Output short circuit current - differential

Complimentary outputs tied

together, T = 25 °C

–12 12 mA

LVPECL CLOCK OUTPUTS (CLKoutX)

CLKout

Operating frequency

(5) (16)

1300 MHz

/ T

20% to 80% output rise R

= 100 Ω, emitter resistors = 240

Ω to GND

CLKoutX_TYPE = 4 or 5

(1600 or 2000 mVpp)

150 ps

80% to 20% output fall time

LMK03806

www.ti.com.cn

ZHCSHU9J –SEPTEMBER 2011–REVISED MARCH 2018

Electrical Characteristics (continued)

3.15 V ≤ V

≤ 3.45 V, -40 °C ≤ T

≤ 85 °C, Junction Temperature T

≤ 125 ° C.

Typical values represent most likely parametric norms at V

= 3.3 V, T

= 25 °C, at Recommended Operating Conditions at

the time of product characterization and are not ensured.

(1)

PARAMETER TEST CONDITIONS MIN TYP MAX UNIT

700-mVpp LVPECL CLOCK OUTPUTS (CLKoutX), CLKoutX_TYPE = 2

Output high voltage

T = 25 ° C, DC measurement

Termination = 50 Ω to

– 1.4 V

– 1.03 V

Output low voltage V

– 1.41 V

Output voltageFigure 6

305 380 440 |mV|

610 760 880 mVpp

1200-mVpp LVPECL CLOCK OUTPUTS (CLKoutX), CLKoutX_TYPE = 3

Output high voltage

T = 25 ° C, DC measurement

Termination = 50 Ω to

– 1.7 V

– 1.07 V

Output low voltage V

– 1.69 V

Output voltageFigure 6

545 625 705 |mV|

1090 1250 1410 mVpp

1600-mVpp LVPECL CLOCK OUTPUTS (CLKoutX), CLKoutX_TYPE = 4

Output high voltage

T = 25 ° C, DC Measurement

Termination = 50 Ω to

– 2 V

– 1.10 V

Output low voltage V

– 1.97 V

Output voltageFigure 6

660 870 965 |mV|

1320 1740 1930 mVpp

2000-mVpp LVPECL (2VPECL) CLOCK OUTPUTS (CLKoutX), CLKoutX_TYPE = 5

Output high voltage

T = 25 ° C, DC Measurement

Termination = 50 Ω to

– 2.3 V

– 1.13 V

Output low voltage V

– 2.20 V

Output voltageFigure 6

800 1070 1200 |mV|

1600 2140 2400 mVpp

LVCMOS CLOCK OUTPUTS (CLKoutX)

CLKout

Operating frequency

(5)

5-pF Load 250 MHz

Output high voltage 1-mA Load V

– 0.1 V

Output low voltage 1-mA Load 0.1 V

Output high current (Source) V

= 3.3 V, V

= 1.65 V 28 mA

Output low current (Sink) V

= 3.3 V, V

= 1.65 V 28 mA

DUTY

CLK

Output duty cycle

(5)

/2 to V

/2, F

CLK

= 100 MHz, T

= 25 °C

45 50 55 %

Output rise time

20% to 80%, R

= 50 Ω,

CL = 5 pF

400 ps

Output fall time

80% to 20%, R

= 50 Ω,

CL = 5 pF

400 ps

DIGITAL OUTPUTS (Ftest/LD, Readback, GPoutX)

High-level output voltage I

= –500 µA V

– 0.4 V

Low-level output voltage I

= 500 µA 0.4 V

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