HMC702LP6CE Datasheet, PDF (14/38 Pages) Hittite Microwave Corporation – 14 GHz 16-Bit Fractional-N Synthesizer

v10.0812
HMC702LP6CE
14 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
opamp is used with a positive slope VCO, phase_sel Reg05h <0> = 1 Table 11 must be set to invert the PFD phase
polarity and obtain correct closed loop operation.
Figure 9. Conventional Synthesizer with VCO
Temperature Sensor
The HMC702LP6CE features a built in temperature sensor which may be used as a general purpose temperature
sensor.
The temperature sensor is enabled via tsens_spi_enable (Reg1Eh=1 Table 35) and when enabled draws 2 mA.
The temperature sensor features a built in 3-bit quantizer that allows the temperature to be read in register tsens_
temperature (Reg21h Table 38 ). The temperature sensor data converter is not clocked. Updates to the temperature
sensor register are made by strobing register tsens_spi_strobe (Reg00h<3> Table 6). The 3-bit quantizer operates
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)
7
6
5
4
3
2
1
0
-40 -20
0
20
40
60
TEMPERATURE (°C)
80
100
Figure 10. 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)
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