MAX2620EVKIT datasheet(2/4 Pages) MAXIM

Part No.	MAX2620EVKIT

Description	Evaluation Kit

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Manufacturer	MAXIM [Maxim Integrated Products]

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• HP8561E spectrum analyzer, or equivalent high-

sensitivity spectrum analyzer with approximately

3GHz frequency range. Contact the instrument

manufacturer for information regarding phase-noise

measurement capabilities.

• Digital multimeter (DMM) to monitor DC supply and

VCONT, if desired

• Male SMA 50Ω terminator

• Network analyzer such as HP8753D (required only

if additional device characterization for oscillator

tank design at other frequencies is desired)

____________Connections and Setup

1) Verify that the shunt on jumper SHDN is installed

between pins 1 and 2 (SHDN = VCC). Placing

the shunt between pins 2 and 3 (SHDN = GND)

puts the MAX2620 into low-current shutdown mode.

2) Connect the spectrum analyzer to either OUT or

OUT. Connect a 50

Ω terminator to the output (OUT

or OUT) not connected to the spectrum analyzer.

3) Connect a +2.7V to +5.25V supply across VCC to

GND. VCC should be the most positive terminal.

4) Connect the tuning voltage supply to either VCONT

or JU1. This supply should be positive when refer-

enced to ground.

____________________________Analysis

1) Using the spectrum analyzer, observe the voltage-

controlled oscillator’s output. With 1.5V applied to

VCONT, the fundamental output frequency will be

near 900MHz. The output power level will be

approximately -2dBm at OUT, or -12.5dBm at OUT.

Varying the voltage applied to VCONT between 0V

and VCC changes the fundamental oscillation fre-

quency. (Increasing the voltage applied to VCONT

increases the frequency, and vice versa.) The typi-

cal tuning range is a 30MHz band centered near

900MHz with VCONT between 0.5V and 3V. To

avoid damaging the varactor, do not apply voltages

greater than 15V to VCONT. (The varactor on the

EV kit board has a 15V breakdown specification.)

2) Allow the oscillator to operate for about 5 minutes

to thermally stabilize the frequency. Since the fre-

quency is not phase-locked to a reference, this

minimizes frequency drift and measurement error.

3) Center the fundamental on the spectrum analyzer

and set the frequency span to 100kHz.

4) Set the spectrum analyzer for single sweep. This

minimizes errors due to oscillator frequency drift.

5) Set the marker on the waveform’s peak.

6) Set another marker to measure the difference

between this peak and the signal level at 25kHz off-

set from the peak. (Phase noise can be observed at

frequencies other than 25kHz offset.)

7) Under the Marker function, select marker noise and

turn it on. This automatically scales the spectrum

analyzer’s output to take into account the resolution

BW filter’s non-ideal characteristics. If your spectrum

analyzer does not offer this feature, contact the man-

ufacturer for proper scaling for noise measurements.

8) Verify that the resolution bandwidth is 1kHz.

9) Verify that the video bandwidth is 1kHz.

10) Read the measurement directly from the screen.

Phase noise will be about -110dBc/Hz. In some envi-

ronments that have ambient pulse noise, this mea-

surement may be difficult to achieve without addi-

tional shielding or the use of a shielded enclosure.

_____________________________Outputs

The MAX2620 EV kit is assembled with OUT matched

to 50

Ω (at approximately 900MHz) using L3 and C13.

OUT is resistively pulled up to the supply with a 51

Ω

resistor, R5. R5 provides a simple broadband 50

Ω out-

put match but offers less output power than OUT. The

EV kit provides additional component pads at R4, C14,

L4, and C11 to accommodate any output match config-

uration for OUT and OUT. Refer to the

Output Matching

Configuration section in the MAX2620 data sheet for

more information.

___________Resonator and Varactor

The resonator tank circuit is critical in determining VCO

performance. It typically contains a varactor (voltage-

variable capacitance) for voltage-tuning the center fre-

quency. For best performance, use high-Q components

and choose values carefully.

The external resonant circuit on the MAX2620 EV kit

has been designed to operate near 900MHz. To syn-

thesize the component values for other frequency

ranges, use the following procedure.

On the EV kit, C3 and C4 are feedback capacitors that

set the oscillator’s negative resistance and impedance.

Their values have been chosen to provide adequate

performance over a 650MHz to 1050MHz frequency

range. To optimize the values of these components for

a specific application, refer to the

Feedback Capacitors

section in the MAX2620 data sheet.

Measure the MAX2620 TANK pin’s input impedance

with feedback capacitors C3 and C4 but without the

resonant circuit. This measurement takes into account

parasitic circuit elements that are specific to board lay-

MAX2620 Evaluation Kit

2

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