HMC1197LP7FE datasheet(26/57 Pages) AD

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HMC1197LP7FE

v03.0314

Wideband direct Quadrature Modulator

w/ Fractional-n Pll & Vco, 100 - 4000 MHz

These settings in Reg 09h impact the required LD window size in fractional mode of operation. To function,

the required lock detect window size is provided by (EQ 10).

(

)

( )

(

)

2.66 10

sec

LD Window seconds

in Fractional Mode

LD Window seconds

in Integer Mode

CP Offset

−

















where:

FPD: is the comparison frequency of the Phase Detector

ICP Offset : is the Charge Pump Offset Current Reg 09h[20:14]

ICP: is the full scale current setting of the switching charge pump Reg 09h[6:0], or Reg 09h[13:7]

(EQ 10)

If the result provided by (EQ 10) is equal to 10 ns Analog LD can be used (Reg 07h[6] = 0). Otherwise

Digital LD is necessary Reg 07h[6] = 1.

Table 12 provides the required Reg 07h settings to appropriately program the Digital LD window size. From

Table 12, simply select the closest value in the “Digital LD Window Size” columns to the one calculated in

(EQ 10) and program Reg 07h[9:8] and Reg 07h[7:5] accordingly.

table 12. typical digital lock detect Window

LD Timer Speed

Reg07[9:8]

Digital Lock Detect Window Size

Nominal Value (ns)

Fastest 00

6.5

100

195

8.9

12.8

130

255

7.1

9.2

13.3

138

272

Slowest 11

7.6

10.2

15.4

172

338

LD Timer Divide Setting

Reg07[7:5]

000

001

010

011

100

101

110

111

1.3.5.2 digital Window configuration example

Assuming, fractional mode, with a 50 MHz PD and

•

Charge Pump gain of 2 mA (Reg 09h[13:7] = 64h, Reg 09h[6:0] = 64h),

•

Down Offset (Reg 09h[22:21] = ‘10’b)

•

Offset current magnitude of +400 µA (Reg 09h[20:14] = 50h)

Applying (EQ 11), the required LD window size is:

(

)

( )

0.4 10

2.66 10

sec

50 10

2 10

50 10

LD Window seconds

13.33 nsec

−





××



(EQ 11)

Locating the Table 12 value that is closest to the (EQ 11) result, in this case 13.3 ≈ 13.33. To set the Digital

LD window size, simply program Reg 07h[9:8] = ‘10’b and Reg 07h[7:5] = ‘010’b according to Table 12.

There is always a good solution for the lock detect window for a given operating point. The user should

understand however that one solution does not fit all operating points. As observed from (EQ 11), If charge

pump offset or PD frequency are changed significantly then the lock detect window may need to be

adjusted.

Information furnished by Analog Devices is believed to be accurate and reliable. However, no

responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other

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

license is granted by implication or otherwise under any patent or patent rights of Analog Devices.

Trademarks and registered trademarks are the property of their respective owners.

For price, delivery, and to place orders: Analog Devices, Inc.,

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106

Phone: 781-329-4700 • Order online at www.analog.com

Application Support: Phone: 1-800-ANALOG-D

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