+3.0V to +5.5V, 1.25Gbps/2.5Gbps

Limiting Amplifiers

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7

Pin Description

EP

EP

Ground. The exposed paddle must be soldered to the circuit–board ground for

proper thermal performance.

Exposed

Paddle

—

7

Output Current Level. When this pin is not connected, the CML output current is

approximately 16mA. When this pin is connected to ground, the output current

increases to approximately 20mA. (In the MAX3265CUB/MAX3765CUB, LEVEL is

internally connected to ground.)

—

15

Squelch Input. The squelch function is disabled when SQUELCH is not connected

or is set to a TTL low level. When SQUELCH is set to a TTL high level and LOS is

asserted, the data outputs, OUT+, and OUT-, are forced to static levels. See sec-

tions PECL Output Buffer and CML Output Buffer for more information. (In the

MAX3265/MAX3268/MAX3269 10-pin µMAX, SQUELCH is not connected. In the

—

16

No Connection

N.C.

SQUELCH

—

10

Noninverted Loss-of-Signal Output. LOS is low when the level of the input signal

is above the preset threshold set by the TH input. LOS asserts high when the sig-

nal level drops below the threshold.

LOS

LEVEL

—

1

Offset-Correction-Loop Capacitor. A capacitor connected between this pin and

CAZ2 extends the time constant of the offset correction loop.

—

2

Offset-Correction-Loop Capacitor. A capacitor connected between this pin and

CAZ1 extends the time constant of the offset correction loop. Refer to Design

Procedure.

CAZ2

CAZ1

6

9

Inverted Loss-of-Signal Output. LOS is high when the level of the input signal is

above the preset threshold set by the TH input. LOS is asserted low when the

signal level drops below the threshold.

8

12

Inverted Data Output

9

13

Noninverted Data Output

OUT+

OUT-

7, 10

11, 14

Supply Voltage

LOS

3

5

Inverted Input Signal

5

8

Loss-of-Signal Threshold. A resistor connected from this pin to ground sets the

input signal level at which the loss-of-signal (LOS) output(s) is asserted. Refer to

Typical Operating Characteristics and Design Procedure.

TH

IN-

2

4

Noninverted Input Signal

IN+

TSSOP

FUNCTION

µMAX

NAME

GND

1, 4

3, 6

Supply Ground

PIN