MAXIM MAX3275, MAX3277 User Manual

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General Description

The MAX3275/MAX3277 transimpedance amplifiers
provide a compact low-power solution for communica­tion up to 2.125Gbps. They feature 300nA input­referred noise at 2.1GHz bandwidth (BW) with 0.85pF
input capacitance. The parts also have 2mA

P-P

AC

input overload.

The MAX3277 is identical to the MAX3275, but with the
output polarities inverted for optimum packaging flexi­bility. Both parts operate from a single 3.3V supply and
consume only 83mW. The MAX3275/MAX3277 are
compact 24mil x 47mil die and require no external com­pensation capacitor. A space-saving filter connection is
provided for positive bias to the photodiode through an
on-chip 600Ω resistor to VCC. These features allow
easy assembly into a TO-46 or TO-56 header with a
photodiode.

The MAX3275/MAX3277 and MAX3274 limiting ampli­fiers provide a two-chip solution for dual-rate, fibre
channel receiver applications.

Applications

Dual-Rate Fibre Channel Optical Receivers

Gigabit Ethernet Optical Receivers

Features

♦ Up to 2.125Gbps (NRZ) Data Rates

♦ 7ps

P-P

Deterministic Jitter for <100µA

P-P

Input Current

♦ 300nA

RMS

Input-Referred Noise at 2.1GHz

Bandwidth

♦ 25mA Supply Current at +3.3V

♦ 2.3GHz Small-Signal Bandwidth

♦ 2.0mA

P-P

AC Overload

♦ Die Size: 24mil x 47mil

MAX3275/MAX3277

Low-Noise, Fibre Channel Transimpedance

Amplifiers

________________________________________________________________ Maxim Integrated Products 1

+3.3V

HOST SERVER

OR SWITCH

SMALL FORM FACTOR

OPTICAL RECEIVER

DESERIALIZER

MAX3274

IN+

IN-

TH SQUELCH BWSEL

RATE SELECT

LOS

LIMITING

AMP

OUT+

100Ω

600Ω

660Ω

100Ω

4.7kΩ
TO
10kΩ

0.1µF

0.1µF

0.1µF

0.1µF

OUT-

LOS

+3.3V

MAX3275

IN

GND

V

CC

TIA

OUT+

OUT-

400pF

C

FILTER

400pF

Typical Application Circuit

19-2207; Rev 1; 3/05

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.

*Dice are guaranteed to operate from 0°C to +85°C, but are test-

ed only at T

A

= +25°C.

Ordering Information

PART TEMP RANGE PIN-PACKAGE

MAX3275U/D 0°C to +85°C Dice*

MAX3277U/D 0°C to +85°C Dice*

MAX3275/MAX3277

Low-Noise, Fibre Channel Transimpedance
Amplifiers

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

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.

Power-Supply Voltage (VCC).................................-0.5V to +4.0V

Continuous CML Output Current

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

Continuous Input Current (IN)...............................-4mA to +4mA

Continuous Input Current (FILTER).......................-8mA to +8mA

Operating Junction Temperature Range (T

J

) ....-55°C to +150°C

Storage Ambient Temperature Range (T

STG

) ...-55°C to +150°C

Die Attach Temperature...................................................+400°C

ELECTRICAL CHARACTERISTICS

(VCC= +3.0V to +3.6V, TA= 0°C to +85°C. Typical values are at VCC= +3.3V, source capacitance (CIN) = 0.85pF, TA= +25°C,
unless otherwise noted.) (Notes 1, 2)

PARAMETER

CONDITIONS MIN

UNITS

Supply Current I

CC

Including output termination current 25 41 mA

-3dB, CIN = 0.6pF (Note 3) 2.0 2.7 3.3

Small-Signal Bandwidth BW

-3dB, C

IN

= 0.85pF (Note 3) 1.7 2.3 2.7

GHz

Low-Frequency Cutoff -3dB, input current = 40µA (Note 3) 65 kHz

Input Bias Voltage 1.0 V
Input Resistance 40 Ω

CIN = 0.6pF, BW = 0.8GHz (Notes 3, 4) 185 250

CIN = 0.6pF, BW = 1.6GHz (Notes 3, 4) 245 350

CIN = 0.6pF, BW = 2.1GHz (Notes 3, 4) 275 380

CIN = 0.85pF, BW = 0.8GHz (Notes 3, 4) 193 275

CIN = 0.85pF, BW = 1.6GHz (Notes 3, 4) 272 400

Input-Referred Noise I

N

CIN = 0.85pF, BW = 2.1GHz (Notes 3, 4) 300 430

nA

RMS

AC Input Overload (Notes 3, 5) 2

mA

P-P

DC Input Overload (Note 5) 1 mA

Filter Resistance

P-P

510 600 690 Ω

Single-ended

50

Ω

1mA

P-P

< input < 2mA

P-P

(Notes 3, 6, 7) 15 40

100µA

P-P

< input ≤ 1mA

P-P

(Notes 3, 6, 7) 15 31

Deterministic Jitter DJ

10µA

P-P

< input ≤ 100µA

P-P

(Notes 3, 6, 7) 7 16

ps

P-P

Transimpedance Differential output 2.8 3.3 3.8 kΩ

Transimpedance Linear Range 0.95 < linearity < 1.05 (Note 8) 50

µA

P-P

Data Output Swing Input > 100µA

P-P

(Note 9) 220 300 500

mV

P-P

Output Data-Transition Time

Input > 200µA

P-P

, 20% to 80% rise/fall time

(Notes 3, 10)

90 140 ps

Freq ≤ 1GHz 15

Output Return Loss

1GHz < freq ≤ 2GHz 10

dB

f < 1MHz (Note 11) 40

Power-Supply Rejection PSR

1MHz ≤ f < 10MHz (Note 11) 34

dB

SYMBOL

TYP MAX

Output Resistance (OUT+, OUT-)

42.5

57.5

MAX3275/MAX3277

Low-Noise, Fibre Channel Transimpedance

Amplifiers

_______________________________________________________________________________________ 3

Note 1: Die parameters are production tested at room temperature only, but are guaranteed by design and characterization from

0°C to +85°C.

Note 2: Source capacitance represents the total capacitance at the IN pad during characterization of the noise and bandwidth

parameters.

Note 3: Guaranteed by design and characterization.
Note 4: Measured using an RF-power meter with no pattern applied at the input. The TIA output is bandwidth limited for

measurement using a 4th-order Bessel Thompson filter. The -3dB frequency of the filter matches the frequency (0.8GHz,

1.6GHz, or 2.1GHz) for the specified noise BW.

Note 5: DC offset and deterministic jitter may exceed specification if AC or DC overload conditions are exceeded.
Note 6: Using fibre channel K28.5± pattern. The input bandwidth is limited to 0.75

✕

(2.125Gbps) by a 4th-order Bessel Thompson

filter. Measured differentially across an AC-coupled 100Ω external load.

Note 7: K28.5± pattern: (00111110101100000101).
Note 8: Gain may vary ±5% relative to reference measured with 30µA

P-P

input.

Note 9: Production tested with 1mA

P-P

input.

Note 10: Using a K28.7 (0011111000) pattern. Measured differentially across an AC-coupled 100Ω external load.

Note 11: Power-supply rejection PSR = -20log(∆V

OUT

/∆VCC), where ∆V

OUT

is the differential output voltage and ∆VCCis the noise

on V

CC

.

ELECTRICAL CHARACTERISTICS (continued)

(VCC= +3.0V to +3.6V, TA= 0°C to +85°C. Typical values are at VCC= +3.3V, source capacitance (CIN) = 0.85pF, TA= +25°C,
unless otherwise noted.) (Notes 1, 2)

Typical Operating Characteristics

(VCC= +3.3V, CIN= 0.85pF, TA= +25°C, unless otherwise noted.)

INPUT-REFERRED NOISE

vs. TEMPERATURE

MAX3275 toc01

AMBIENT TEMPERATURE (°C)

INPUT-REFERRED NOISE (nA

RMS

)

80604020

210

220

230

240

250

260

270

280

290

300

310

320

330

340

350

200

0100

CIN = 0.85pF

CIN = 0.6pF

CIN IS SOURCE CAPACITANCE
PRESENTED TO DIE, INCLUDING
PIN DIODE, AND PARASITIC
INTERCONNECT CAPACITANCE

BW = 1.6GHz

150

180

170

160

190

200

210

220

230

240

250

04020 60 80 100

INPUT-REFERRED NOISE

vs. TEMPERATURE

MAX3275 toc02

AMBIENT TEMPERATURE (°C)

INPUT-REFERRED NOISE (nA

RMS

)

CIN = 0.85pF

CIN = 0.6pF

C

IN

IS SOURCE CAPACITANCE
PRESENTED TO DIE, INCLUDING
PIN DIODE, AND PARASITIC
INTERCONNECT CAPACITANCE

BW = 0.8GHz

57

100M 1G 10G

FREQUENCY RESPONSE

61

59

MAX3275 toc03

FREQUENCY (Hz)

TRANSIMPEDANCE (dBΩ)

65

63

67

69

71