For price, delivery and to place orders: Hittite Microwave Corporation, 20 Alpha Road, Chelmsford, MA 01824

Phone: 978-250-3343

Fax: 978-250-3373

Order On-line at www.hittite.com

Application Support: Phone: 978-250-3343 or apps@hittite.com

14

HMC701LP6CE

v09.1112

8 GHz 16-BIT FRACTIONAL-N PLL

External VCO with Active Inverting OpAmp Loop Filter

an external opamp active filter is required to support external Vcos with tuning voltages above 5V. if an inverting

polarity and obtain correct closed loop operation.

Temperature Sensor

the HMc701LP6cE features a built in temperature sensor which may be used as a general purpose temperature

sensor.

the temperature sensor features a built in 3-bit quantizer that allows the temperature to be read in register tsens_

over a -40°c to +100°c range as follows:

tn = floor {(temperature +40) / 17.5 where Tn is the decimal value of register tsens_temperature}

(EQ 7)

0

1

2

3

4

5

6

7

-40

-20

0

20

40

60

80

100

TEMPERATURE (°C)

Figure 9. Typical Temperature Sensor Quantizer output

temperature sensor slope is 17.5 mV/lsb. absolute tolerances on the temperature sensor thresholds may vary by up

to ±10°c worst case.

nominal temperature is given by:

(EQ 8)

Charge Pump & Phase Frequency Detector (PFD)

the Phase Frequency Detector or PFD has two inputs, one from the reference path divider and one from the Vco path

divider. the PFD compares the phase of the Vco path signal with that of the reference path signal and controls the

charge pump output current as a linear function of the phase difference between the two signals. the output current

varies linearly over a full ±2π radians input phase difference.

PFD Functions

slope Vco.

the charge pump from pumping up.

prevents the charge pump from pumping down.

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