Figure 3. Close up view of the control dip switches on the Evaluation board

Turn on Sequence

1. Please take caution of static damage as the evaluation board and the phase detector

device are both sensitive to static discharge.

2. If RF inputs/outputs are used in single-ended configuration, terminate unused inputs/outputs

with 50 ohm loads.

3. Apply a +3.3V supply (VCC) to the evaluation board (J17, SMA (f) connector) for the

divider/phase detector.

Warning: In order to avoid damaging the device, +3.3V supply must be turned on before

turning on the op-amp bias voltages (+25V and -5V).

4. Apply a +25V supply to the evaluation board (J19, SMA (f) connector) for the op-amp.

5. Apply a -5V supply to the evaluation board (J18, SMA (f) connector) for the op-amp.

6. Use on-board dip switches to adjust the Reference and VCO divide ratios. Note all zeros is a

default divide by 1.

Switch Settings (Open = 0, Close = 1)

Division Ratio Output

VCO (S3)

V6 V5 V4 V3 V2 V1 V0

(V6=MSB)

REF (S1)

R6 R5 R4 R3 R2 R1 R0

(R6=MSB)

0000001

0000001

1

1000000

1000000

1/64

1111111

1111111

1/127

Enable side

Enable side

Enable side

Open side

Open side

Open side

Ref divider modulus

control enable switch

(R0-R6, MSB=R6)

VADR output

amplitude switch

control

VADR (divided ref

output amplitude analog

control, if VADR dip

switch is in the open

position)

Charge pump output

gain switch control

(A0-A3, MSB=A3)

VCO divider modulus

control enable switch

(V0-V6, MSB=V6)

VADV (divided VCO

output amplitude analog

control, if VADV dip

switch is in the open

position)

VADJ (Charge pump gain analog

control, if VADJ dip switch S2 -

position 2 is in the open position)

VADV output

amplitude switch

control

Polarity of phase

detector switch control

(enable = reverses the

polarity of the charge

pump outputs)

VADJ charge

pump output

gain switch

control

S3

S2

S1

14 of 19

SMD-00191 Rev D

Subject to Change Without Notice

PFD1K