SP6660EB datasheet(2/6 Pages) SIPEX

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SP6660EB/06

SP6660 Evaluation Board Manual

BOARD LAYOUT

The SP6660 Evaluation Board has been

designed to conveniently provide access to all

Inputs and Outputs of the SP6660 device under

test. Position the board with the silkscreen letter-

ing upright (also see the drawing on the front

page of this manual) and you will see two circuits

– the Doubler Circuit on top, and the Inverter

Circuit below. Also, note the Doubler Circuit is

followed by an LDO Circuit, producing a 5V

regulated output from a 3V input to the Doubler.

The Input and Output connections are made with

raised female pin receptacles which can

accommodate easy-hook connection leads for

power and meter connections, as well as scope

probe hooks and grounds for waveform

measurements.

USING THE EVALUATION BOARD

Connect the SP6660 Evaluation Board

Doubler Circuit or Inverter Circuit to a positive

power supply for V

IN. It is good practice to not

switch power on until power connections are

made to the evaluation board.

Evaluating Doubler Circuit

— U1-3 — Connect to external supply V

= +2.5 to +4.25V.

GND —

U1-5 — Connect to external

supply GND.

CAP+ — U1-2 — Use to monitor Charge Pump

Frequency (1/2 OSC pin frequency).

OUT

— U1-8 — Connect to Load, Meter or

Scope. V

OUT = +5.0 to +8.5V.

GND — U1-5 — Connect to Load, Meter or

Scope GND.

— U1-1 — Connect to OPEN for Low

Frequency, to V

OUT for High Frequency.

Evaluating Doubler Circuit

with 5V LDO Regulator

Same connections as Doubler above, but with

additional LDO outputs:

— U2-5 — Connect to Load, Meter or

Scope. VOUT = +5.0V.

GND — U2-2 — Connect to Load, Meter or

Scope GND.

Evaluating Inverter Circuit

— U3-8 — Connect to external supply V

= +1.5 to +4.25V.

GND —

U3-3 — Connect to external

supply GND.

CAP+ — U3-2 — Use to monitor Charge Pump

Frequency (1/2 OSC pin frequency).

OUT

— U3-5 — Connect to Load, Meter or

Scope. V

OUT = -1.5 to -4.25V.

GND — U3-3 — Connect to Load, Meter or

Scope GND.

— U3-1 — Connect to OPEN for Low

Frequency, to V

OUT for High Frequency.

Evaluating Oscillator Performance

with Inverter or Doubler Circuit

To accurately measure the internal oscillator

frequency at pin 7 is extremely difficult;

any connection to this pin may induce

capacitance which will change the frequency

(1/RoscCosc). For this reason the SP6660

Evaluation Board has only a small pad

connection to it and not a pin receptacle.

Alternatively, you can measure the charge pump

frequency at the CAP+ pin, which equals 1/2 the

OSC pin frequency.

To run the Inverter or Doubler Circuit at other

frequencies, the OSC pin can be driven with an

external oscillator with a square wave of 0 to V

volts. Tests have shown that the circuits can

typically perform up to oscillator frequencies of

800kHz.

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