MAXIM MAX3264, MAX3265, MAX3268, MAX3269, MAX3765 User Manual

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V

CC

V

CC

C

AZ

CAZ1 CAZ2

V

CC

V

CC

C

IN

0.01µF

0.01µF

0.01µF

C

IN

0.01µF
TH SQUELCH

N.C.

100Ω

IN-

IN+

OUT+

R

TERM

R

TERM

R

L

100Ω

OUT-

MAX3266
MAX3267

MAX3264CUE
MAX3265CUE
MAX3265EUE

LOS

LOSS

OF

SIGNAL

LOS

N.C.

R

TH

LEVEL

N.C.

General Description

The 1.25Gbps MAX3264/MAX3268/MAX3768 and the

2.5Gbps MAX3265/MAX3269/MAX3765 limiting ampli­fiers are designed for Gigabit Ethernet and Fibre
Channel optical receiver systems. The amplifiers accept
a wide range of input voltages and provide constant­level output voltages with controlled edge speeds.
Additional features include RMS power detectors with
programmable loss-of-signal (LOS) indication, an
optional squelch function that mutes the data output sig­nal when the input voltage falls below a programmable
threshold, and excellent jitter performance.

The MAX3264/MAX3265/MAX3765 feature current-mode
logic (CML) data outputs that are tolerant of inductive
connectors and a 16-pin TSSOP package, making these
circuits ideal for GBIC receivers. The MAX3268/
MAX3269/MAX3768 feature standards-compliant posi­tive-referenced emitter-coupled logic (PECL) data out­puts and are available in a tiny 10-pin µMAX package
that is ideal for small-form-factor (SFF) receivers.

Applications

Gigabit Ethernet Optical Receivers
Fibre Channel Optical Receivers
System Interconnect
ATM Optical Receivers

Features

♦ +3.0V to +5.5V Supply Voltage
♦ Low Deterministic Jitter

14ps (MAX3264)
11ps (MAX3265/MAX3765)

♦ 150ps (max) Edge Speed (MAX3265/MAX3765)

300ps (max) Edge Speed (MAX3264)

♦ Programmable Signal-Detect Function
♦ Choice of CML or PECL Output Interface
♦ 10-Pin µMAX or 16-Pin TSSOP Package

MAX3264/MAX3265/MAX3268/MAX3269/MAX3765/MAX3768

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

Limiting Amplifiers

________________________________________________________________ Maxim Integrated Products 1

19-1523; Rev 6, 5/04

+Denotes lead-free package.
*EP = Exposed paddle.

**Dice are designed to operate from 0°C to +70°C, but are tested

and guaranteed only at T

A

= +25°C.

Ordering Information

Selector Guide appears at end of data sheet.
Pin Configurations appear at end of data sheet.

Typical Operating Circuits

Typical Operating Circuits continued at end of data sheet.

For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.

PART TEMP RANGE

PIN-PACKAGE

MAX3264CUE 0°C to +70°C 16 TSSOP-EP*

MAX3264CUE+ 0°C to +70°C 16 TSSOP-EP*
MAX3264C/D 0°C to +70°C Dice**
MAX3265CUE 0°C to +70°C 16 TSSOP-EP*
MAX3265CUE+ 0°C to +70°C 16 TSSOP-EP*
MAX3265CUB 0°C to +70°C 10 µMAX-EP*
MAX3265CUB+ 0°C to +70°C 10 µMAX-EP*
MAX3265EUE -40°C to +85°C 16 TSSOP-EP*
MAX3265EUE+ -40°C to +85°C 16 TSSOP-EP*
MAX3265C/D 0°C to +70°C Dice**

Ordering Information continued at end of data sheet.

MAX3264/MAX3265/MAX3268/MAX3269/MAX3765/MAX3768

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

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

ELECTRICAL CHARACTERISTICS

(Data outputs terminated per Figure 1, VCC= +3.0V to +5.5V, TA= 0°C to +70°C. Typical values are at V

CC

= +3.3V, TA= +25°C,

unless otherwise noted.) (Note 1)

Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.

Supply Voltage (VCC)............................................-0.5V to +6.0V

Voltage at IN+, IN- ..........................(V

CC

- 2.4V) to (VCC+ 0.5V)

Voltage at SQUELCH, CAZ1,

CAZ2, LOS,

LOS, TH..................................-0.5V to (VCC+ 0.5V)

Voltage at LEVEL...................................................-0.5V to +2.0V

Current into LOS, LOS ..........................................-1mA to +9mA

Differential Input Voltage (IN+ - IN-) .....................................2.5V

Continuous Current at

CML Outputs (OUT+, OUT-)..........................-25mA to +25mA

Continuous Current at PECL Outputs (OUT+, OUT-) .........50mA

Continuous Power Dissipation (T

A

= +70°C)

16-Pin TSSOP (derate 27mW/°C above +70°C) .........2162mW

10-Pin µMAX (derate 20mW/°C above +70°C)...........1600mW

Operating Ambient Temperature Range.............-40°C to +85°C

Storage Temperature Range.............................-55°C to +150°C

Processing Temperature (dice).......................................+400°C

Lead Temperature (soldering, 10s).................................+300°C

Deterministic Jitter

MAX3265/MAX3269/MAX3765 (Notes 2, 3)

MAX3265/MAX3269/MAX3765

MAX3264/MAX3268/MAX3768

MAX3265/MAX3269/MAX3765

MAX3264/MAX3268/MAX3768

4.5

8.5

Low LOS Deassert Level mVRTH= 2.5kΩ

MAX3264/MAX3268/MAX3768 (Notes 2, 3)

PARAMETER MIN TYP MAX UNITS

10 1200

5 1200

Data Rate Gbps

Input Voltage Range mV

14 30
11 25

1.25

2.5

psp-p

15

Random Jitter

8

ps

RMS

80 175 300

100 150

80 150 300

Data Output Edge Speed

100 150

ps

LOS Hysteresis 2.5 4.4 dB
LOS Assert/Deassert Time 1 µs

1.20 2.6

2.20 4.8

Low LOS Assert Level mV

CONDITIONS

MAX3264/MAX3268/MAX3768 (Notes 2, 4)

MAX3265/MAX3269/MAX3765

MAX3264/MAX3268/MAX3768

MAX3265/MAX3269/MAX3765 (Notes 2, 4)
MAX3264 (Note 5)
MAX3265/MAX3765 (Note 6)
MAX3268/MAX3768 (Note 5)
MAX3269 (Note 6)

MAX3264/MAX3268/MAX3768

(Notes 2, 7)

MAX3265/MAX3269/MAX3765

(Notes 7, 8)
RTH= 2.5kΩ

MAX3264/MAX3265/MAX3268/MAX3269/MAX3765/MAX3768

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

Limiting Amplifiers

_______________________________________________________________________________________ 3

ELECTRICAL CHARACTERISTICS (continued)

(Data outputs terminated per Figure 1, VCC= +3.0V to +5.5V, TA= 0°C to +70°C. Typical values are at V

CC

= +3.3V, TA= +25°C,

unless otherwise noted.) (Note 1)

PARAMETER CONDITIONS

UNITS

MAX3264/MAX3268/MAX3768 5.6 9

Medium LOS Assert Level RTH = 7kΩ

MAX3265/MAX3269/MAX3765

9.9 16

mV

MAX3264/MAX3268/MAX3768

15

Medium LOS Deassert Level RTH = 7kΩ

MAX3265/MAX3269/MAX3765

27

mV

MAX3264/MAX3268/MAX3768 9.4

High LOS Assert Level RTH = 20kΩ

MAX3265/MAX3269/MAX3765

mV

MAX3264/MAX3268/MAX3768 35

High LOS Deassert Level RTH = 20kΩ

MAX3265/MAX3269/MAX3765 67

mV

Squelch Input Current 0 80 400 µA
Differential Input Resistance IN+ to IN- 97

103 Ω

MAX3264/MAX3268/MAX3768

Input-Referred Noise

MAX3265/MAX3269/MAX3765

µV

RMS

LEVEL = open, R

LOAD

= 50Ω

CML Output Voltage

LEVEL = GND, R

LOAD

= 75Ω

mV

PECL Output High Voltage

Referenced to V

CC

V

PECL Output Low Voltage

Referenced to V

CC

V

LOS Output High Voltage

I

LOS

= -30µA 2.4 V

LOS Output Low Voltage

I

LOS

= +1.2mA 0.4 V

Output Signal When Squelched

Outputs AC-coupled 20 mV

Power-Supply Rejection Ratio

f < 2MHz 20 dB
CAZ = open 2

MHz

Low-Frequency Cutoff

C

AZ

= 0.1µF 2 kHz

MAX3264/MAX3265/MAX3765 85

115

O utp ut Resi stance ( S i ng l e E nd ed )

MAX3268/MAX3269/MAX3768 4

Ω

MAX3268 39 62
MAX3269 48 78
MAX3264 38 62
MAX3265 50 76
MAX3765 50 76

Output not
squelched

MAX3768 39 62

Power-Supply Current Figure 2

MAX3765 64 90

mA

Output squelched

MIN TYP MAX

18.0 41.5

550 1200

1100 1270 1800

-1.025 -0.880

-1.810 +1.620

21.6

100
150
230

100

19.8

40.5

mV

V

V

mV

MAX3264/MAX3265/MAX3268/MAX3269/MAX3765/MAX3768

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

4 _______________________________________________________________________________________

Note 1: Specifications for Input Voltage Range, LOS Assert/Deassert Levels, and CML Output Voltage refer to the total differential

peak-to-peak signal applied or measured. PECL output voltages are absolute (single-ended) voltages measured at a single
output.

Note 2: Input edge speed is controlled using four-pole, lowpass Bessel filters with bandwidth approximately 75% of the maximum

data rate.

Note 3: Deterministic jitter is measured with a K28.5 pattern (0011 1110 1011 0000 0101). Deterministic jitter is the peak-to-peak

deviation from ideal time crossings, measured at the zero-level crossings of the differential output per ANSI X3.230,
Annex A.

Note 4: Random jitter is measured with the minimum input signal applied after filtering with a four-pole, lowpass, Bessel filter (fre-

quency bandwidth at 75% of the maximum data rate). For Fibre Channel and Gigabit Ethernet applications, the peak-to­peak random jitter is 14.1-times the RMS random jitter.

Note 5: Input signal applied after a 933MHz Bessel filter.
Note 6: Input signal applied after a 1.8GHz Bessel filter.
Note 7: Input for LOS assert/deassert and hysteresis tests is a repeating K28.5 pattern. Hysteresis is defined as:

20log (V

LOS-DEASSERT

/ V

LOS-ASSERT

).

Note 8: Response time to a 10dB change in input power.

ELECTRICAL CHARACTERISTICS—MAX3265EUE

(Data outputs terminated per Figure 1, VCC= +3.0V to +5.5V, TA= -40°C to +85°C. Typical values are at V

CC

= +3.3V, TA= +25°C,

unless otherwise noted.) (Note 1)

CONDITIONS

Data Rate Gbps

2.5

UNITSMIN TYP MAXPARAMETER

Input Voltage Range mV

10 1200

(Notes 2, 3)Deterministic Jitter ps

p-p

11 25

(Notes 2, 4)Random Jitter ps

RMS

8

(Note 6)Data Output Edge Speed ps

100 155

(Notes 2, 7)LOS Hysteresis dB

2.2 4.4

(Notes 7, 8)LOS Assert/Deassert Time µs

1

Output Resistance (single ended) Ω

85 100 115

CAZ= 0.1µF kHz

2

CAZ= open

Low-Frequency Cutoff

MHz

2

f < 2MHzPower-Supply Rejection Ratio dB

20

Outputs AC-coupledOutput Signal When Squelched

20

I

LOS

= +1.2mALOS Output Low Voltage

0.450

I

LOS

= -30µALOS Output High Voltage

LEVEL = GND, R

LOAD

= 75Ω

1100 1270 1800

LEVEL = open, R

LOAD

= 50Ω

CML Output Voltage

550 1200

Input-Referred Noise

µV

RMS

230

IN+ to IN-Differential Input Resistance

Ω

97 100 103

Squelch Input Current

µA0 80 400

RTH= 20kΩHigh LOS Deassert Level mV

67 111

RTH= 20kΩHigh LOS Assert Level mV

18.0 41.5

RTH= 7kΩMedium LOS Deassert Level mV

27 43.0

RTH= 7kΩMedium LOS Assert Level mV

9.9 16

RTH= 2.5kΩLow LOS Deassert Level mV

8.5 13.6

RTH= 2.5kΩLow LOS Assert Level mV

2.20 4.8

Figure 2Power-Supply Current mA

50 76

2.4

MAX3264/MAX3265/MAX3268/MAX3269/MAX3765/MAX3768

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

Limiting Amplifiers

_______________________________________________________________________________________ 5

0

25

20

15

10

5

30

0 200 400 600 800 1000 1200

MAX3264/MAX3268/MAX3768

DETERMINISTIC JITTER

vs. INPUT AMPLITUDE

MAX3264/5/8/9 TOC04

INPUT AMPLITUDE (mV)

JITTER (ps)

0

14
12
10

8
6

2

4

16

0 1020304050

MAX3264/MAX3268/MAX3768

RANDOM JITTER

vs. INPUT AMPLITUDE

MAX3264/5/8/9 TOC05

INPUT AMPLITUDE (mV)

RMS JITTER (ps)

300

900

700

500

1300

1100

1500

1700

024681012

OUTPUT VOLTAGE

vs. INPUT VOLTAGE

MAX3264/5/8/9 TOC01a

INPUT VOLTAGE (mV)

OUTPUT VOLTAGE (mV)

MAX3264/MAX3268

MAX3265/MAX3269/MAX3765

3.5

4.0

6.5

6.0

5.5

5.0

4.5

0 10203040506070

MAX3264

LOS HYSTERESIS vs. TEMPERATURE

MAX3264/5/8/9 TOC03a

TEMPERATURE (°C)

LOS HYSTERESIS (dB)

RTH = 25kΩ

RTH = 7kΩ

0

25

20

15

10

5

30

0 200 400 600 800 1000 1200

MAX3265/MAX3269/MAX3765

DETERMINISTIC JITTER

vs. INPUT AMPLITUDE

MAX3264/5/8/9 TOC06

INPUT AMPLITUDE (mV)

JITTER (ps)

0

7
6
5
4
3

1

2

8

0 1020304050

MAX3265/MAX3269/MAX3765

RANDOM JITTER

vs. INPUT AMPLITUDE

MAX3264/5/8/9 TOC07

INPUT AMPLITUDE (mV)

RMS JITTER (ps)

V

IN

V

OUT

V

LOS

LOSS OF SIGNAL WITH SQUELCH

MAX3264/5/8/9 TOC08

500ns/div

300mV/div

200ps/div

MAX3268/MAX3768

DATA OUTPUT EYE DIAGRAM

(MINIMUM INPUT)

MAX3264/5/8/9 TOC09

Typical Operating Characteristics

(TA = +25°C, unless otherwise noted.)

3.5

4.0

6.5

6.0

5.5

5.0

4.5

-40 -15 10 35 60 85

MAX3265EUE

LOS HYSTERESIS vs. TEMPERATURE

MAX3264/5/8/9 TOC03

TEMPERATURE (°C)

LOS HYSTERESIS (dB)

RTH = 4.6kΩ

RTH = 16kΩ

MAX3264/MAX3265/MAX3268/MAX3269/MAX3765/MAX3768

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

6 _______________________________________________________________________________________

Typical Operating Characteristics (continued)

(TA = +25°C, unless otherwise noted.)

150mV/div

MAX3265/MAX3765

DATA OUTPUT EYE DIAGRAM

2.5Gbps (MAXIMUM INPUT)

MAX3264/5/8/9 TOC13

100ps/div

0

25

15

20

10

5

100k 1M 10M 100M 1G

POWER-SUPPLY REJECTION RATIO

vs. FREQUENCY

MAX3264/5/8/9 TOC14

FREQUENCY (Hz)

PSRR (dB)

1.0

3.5

3.0

2.5

1.5

2.0

4.0

0 0.5 1.0 1.5 2.0 3.0

OUTPUT VSWR vs. FREQUENCY

MAX3264/5/8/9 TOC15

FREQUENCY (GHz)

VSWR

2.5

0

10

5

20
15

35
30
25

40

0105 1520253035

MAX3264

LOSS-OF-SIGNAL THRESHOLD vs. R

TH

MAX3264/5/8/9 TOC18

RTH (kΩ)

LOS ASSERT THRESHOLD (mV)

0

50

40

30

10

20

60

010203051525

MAX3265/MAX3765

LOSS-OF-SIGNAL THRESHOLD vs. R

TH

MAX3264/5/8/9 TOC19

RTH (kΩ)

LOS ASSERT THRESHOLD (mV)

5

40

45

50

35
30

20
15
10

25

55

1M 100M 10G10M 1G

COMMON-MODE REJECTION RATIO

vs. FREQUENCY

MAX3264/5/8/9 TOC20

FREQUENCY (Hz)

CMRR (dB)

MAX3268/MAX3768

MAX3265/MAX3765

150mV/div

MAX3264

DATA OUTPUT EYE DIAGRAM AT

1.25Gbps (MINIMUM INPUT)

MAX3264/5/8/9 TOC10

200ps/div

50mV/div

MAX3264

DATA OUTPUT EYE DIAGRAM AT

1.25Gbps (MAXIMUM INPUT)

MAX3264/5/8/9 TOC11

200ps/div

150mV/div

MAX3265/MAX3765

DATA OUTPUT EYE DIAGRAM

2.5Gbps (MINIMUM INPUT)

MAX3264/5/8/9 TOC12

100ps/div