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SY89423V

5V/3.3V DUAL HIGH-PERFORMANCE PHASE LOCKED LOOP

Micrel 

Micrel

PIN NAMES

Pin

F1A

F2A

RINA

RINA

FINA

FINA

HFINA

HFINA

FOUTA

FOUTA

HFOUTA

HFOUTA

F1B

F2B

RINB

RINB

FINB

FINB

HFINB

HFINB

FOUTB

FOUTB

HFOUTB

HFOUTB

VCC

VCCOA

VCCOB

VEE

S1A

S2A

S3A

S1B

S2B

S3B

S4B

S5B

Function

Filter Pin 1A

Filter Pin 2A

Inverted Reference Input A

Reference Input A

Feedback Input A

Inverted Feedback Input A

High Frequency Input A

Inverted High Frequency Input A

Frequency Output A

Inverted Frequency Output A

High Frequency Output A

Inverted High Frequency Output A

Filter Pin 1B

Filter Pin 2B

Reference Input B

Inverted Reference Input B

Feedback Input B

Inverted Feedback Input B

High Frequency Input B

Inverted High Frequency Input B

Frequency Output B

Inverted Frequency Output B

High Frequency Output B

Inverted Frequency Output B

VCC

Output VCC

Output VCC

VEE (0V)

Select Input 1A (TTL)

Select Input 2A (TTL)

Select Input 3A (TTL)

Select Input 1B (TTL)

Select Input 2B (TTL)

Select Input 3B (TTL)

Select Input 4B (TTL)

Select Input 5B (TTL)

Precision Edge®

SY89423V

PIN DESCRIPTION

I/O

RINA, RINA, RINB, RINB

I/O

Reference frequency inputs for loop A and B. These are

differential signal pairs and may be driven differentially or

I/O single-ended.

I

FINA, FINA, FINB, FINB

I

Feedback frequency inputs for loop A and B. These are

I

differential signal pairs and may be driven differentially or

I

single-ended.

I

HFINA, HFINA, HFINB, HFINB

I

High frequency feedback inputs. Differential drive is

O

recommended.

O

F1A, F2A, F1B, F2B

O

These pins are connection points for the loop filters, which are

O

to be provided off-chip. F1X is the high impedance side, F2X

I/O

is the reference side. The loop filter should be a first order, low

pass with a DC block. The difference voltage on these pins will

I/O be a DC level, which is controlled by the loop feedback and

I

determined by the required VCO frequency.

I

FOUTA, FOUTA, FOUTB, FOUTB

I

Frequency outputs for the loops. These are differential, positive

I

referenced, emitter-follower signals and must be terminated

I

off-chip. Termination in 50 ohms is recommended.

I

HFOUTA, HFOUTA, HFOUTB, HFOUTB

O

High frequency outputs. These are differential, positive

O

referenced, emitter-follower signals and must be terminated

off-chip. Termination in 50 ohms is recommended.

O

O

S1A, S2A, S3A, S1B, S2B, S3B, S4B, S5B

—

These inputs are used to select the configuration for PLLA and

PLLB. See the Frequency Selection Table for details of the

—

logic.

—

—

VCC

This is the positive supply for the chip. It should be decoupled

I

and present a low impedance in order to assure low-jitter

I

operation.

I

VCCOA, VCCOB

I

These are the positive supplies for the output buffers. They are

I

constrained to be equal to or less than the value of VCC.

I

VEE

I

This pin is the negative supply for the chip and is normally

I

connected to ground (0V).

M9999-091707

hbwhelp@micrel.com or (408) 955-1690

3

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