Maxim MAX3866E-D Datasheet

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General Description

The MAX3866 combined transimpedance preamplifier
and limiting postamplifier is intended for application in
SDH/SONET systems operating at 2.488Gbps. It oper­ates from a single +3.3V or +5V supply and provides a
differential output signal. The differential outputs are
each 50Ω reverse terminated (100Ω differential termi­nation) for low-noise and high-speed signal perfor­mance.

The small-signal bandwidth and noise performance is
specified for a source capacitance of 0.5pF. When the
MAX3866 is used with the PIN photodetector, sensitivi­ties better than -22dBm can be achieved. The
MAX3866 is equipped with a programmable TTL loss­of-power (LOP) output.

Applications

SDH/SONET Transmission Systems
PIN/Preamplifier Receivers

2.488Gbps ATM Receivers
Regenerators for SDH/SONET

Features

♦ Input Sensitivities Better than -22dBm (7.8µAp-p)
♦ Overdrive Capability Better than +1.4dBm

(2.5mAp-p)

♦ Single +3.3V or +5V Supply
♦ 165mW Power Dissipation (at 3.3V)
♦ 1.8GHz Analog Input Bandwidth
♦ Programmable Loss-of-Power Indicator
♦ 100Ω Differential Output

MAX3866

2.5Gbps, +3.3V Combined

Transimpedance/Limiting Amplifier

________________________________________________________________

Maxim Integrated Products

1

Zo = 50Ω

Zo = 50Ω

+3.3V

PHOTODIODE

CHF+ PDCCHF- INV

C

HF

R

PD

FIL

IN+

MAX3866

LIMITING

POSTAMP

PREAMP

LOP

OUT+

VCCS

VCCD

OUT-

CLOCK AND DATA

RECOVERY

MAX3875

200Ω

Typical Application Circuit

19-1433; Rev 1; 3/99

PART

MAX3866E/D (see Note)

TEMP. RANGE PIN-PACKAGE

Dice

Note: Dice are designed to operate over a -40°C to +120°C

junction temperature (T

j

) range, but are tested and guaranteed

at TA= +25°C.

Pad Configuration appears at end of data sheet.

Ordering Information

MAX3866

2.5Gbps, +3.3V Combined
Transimpedance/Limiting Amplifier

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

DC ELECTRICAL CHARACTERISTICS

(VCCD = VCCS = +3.3V ±5% or VCCD = +5.0V ±10%, VCCS = open, Tj= -40°C to +120°C, unless otherwise noted. Typical values
are at +3.3V and T

j

= +25°C.)

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.

Note 1: CIN= total capacitance on IN.
Note 2: AC parameters are guaranteed by design and characterization.
Note 3: See

Typical Operating Characteristics

for worst-case distribution.

Note 4: Hysteresis = 20 log (V

DEASSERT

/ V

ASSERT

).

Note 5: I

IN

= 2.5mA.

Note 6: PWD = [(2 · Pulse Width) - Period] / 2.
Note 7: External load not required for normal operation.

VCCD Voltage .......................................................-0.5V to +7.0V

VCCS Voltage...............0 ≤ VCCS ≤ VCCD and if VCCD ≥ 3.13V

then 3.13V ≤ VCCS ≤ VCCD

CHF+, CHF-, FIL, INV, LOP Voltage.......-0.5V to (VCCD + 0.5V)

IN-, IN+ Voltage.....................................................-0.5V to +1.0V

CPD+, CPD- Voltage................(VCCD - 1.6V) to (VCCD + 0.5V)

OUT+, OUT- Voltage................(VCCD - 1.1V) to (VCCD + 0.5V)

IN Current.......................................................................0 to 3mA

PDC Current..................................................................-1mA to 0

Operating Junction Temperature Range (T

j

).....-55°C to +125°C

Storage Temperature Range.............................-60°C to +160°C

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

Load = 4.7kΩ to V

CCD

(Note 7)

Load = 4.7kΩ to V

CCD

(Note 7)
RL= 100Ω (differential), IIN≥ 7µAp-p
RL= 100Ω (differential)

CONDITIONS

Ω90 105 120Z

OUT

Differential Output Impedance

V0.84 0.95V

IN

mA50 73I

VCC

Supply Current
Input Bias Voltage

VV

CCD

- 0.1 V

CCD

V

OH

LOP Output High Voltage

V0.4V

OL

LOP Output Low Voltage

mVp-p100 145V

OD

Differential Output Voltage Swing

VV

CCD

- 0.12V

CM

Output Common-Mode Voltage

UNITSMIN TYP MAXSYMBOLPARAMETER

(Notes 5, 6)

20% to 80% (Note 5)

RPD= 510Ω

RPD= 510Ω

CIN= 0.5pF, Tj= +120°C

2.5Gbps, 223- 1 PRBS, BER ≤ 10

-10

,

CIN= 0.5pF, Tj= +120°C

Electrical (Note 4), low LOP assert,
RPD= 510Ω

f ≤ 2MHz, 100mVp-p

CONDITIONS

ps21 80PWDPulse-Width Distortion

ps50 70tr, t

f

Output Edge Speed

µA8.0LOP Deassert Level

µA0.9LOP Assert Level

dB3LOP Hysteresis

dB25 30PSRRPower-Supply Rejection Ratio

kHz100f

L

Low-Frequency Cutoff

nA433 566N

IN

Input-Referred RMS Noise

µAp-p7.8 (Note 3)I

IN

Input Sensitivity

GHz1.8BWSmall-Signal Bandwidth

UNITSMIN TYP MAXSYMBOLPARAMETER

AC ELECTRICAL CHARACTERISTICS

(VCCD = VCCS = +3.3V ±5% or VCCD = +5.0V ±10%, VCCS = open, Tj= -40°C to +120°C, unless otherwise noted. Typical values
are at +3.3V and T

j

= +25°C.) (Notes 1, 2)

MAX3866

2.5Gbps, +3.3V Combined

Transimpedance/Limiting Amplifier

_______________________________________________________________________________________

3

90

0

10 100

LOP ASSERT/DEASSERT

vs. R

PD

50
40
30
20
10

MAX3866 TOC01

RPD (Ω)

ASSERT/DEASSERT (µA)

60

70

80

ASSERT

DEASSERT

0

4
2

8
6

10

12

14

16

-60 -20 0-40 20 40 60 80 100

PULSE-WIDTH DISTORTION

vs. TEMPERATURE

MAX3866 TOC02

TEMPERATURE (¡C)

PWD (ps)

IN+ = 100µA

3.00

3.35

3.30

3.25

3.20

3.15

3.10

3.05

3.45

3.40

3.50

-50 -20 0-30 20 40 60 80 100

OUTPUT COMMON-MODE VOLTAGE

vs. TEMPERATURE

MAX3866 toc03

TEMPERATURE (°C)

COMMON-MODE VOLTAGE (V)

OUT+
OUT-

100

105

115
110

125
120

130

135

145
140

150

-60 -40 -20 0 20 40 60 80 100

DIFFERENTIAL OUTPUT VOLTAGE

vs. TEMPERATURE

MAX3866 TOC04

TEMPERATURE (°C)

DIFFERENTIAL OUTPUT VOLTAGE (mVp-p)

1k 10k

-20

-15

-10

-5

0

10

5

15

20

1 10 100

PULSE-WIDTH DISTORTION

vs. INPUT CURRENT

MAX3866 TOC07

INPUT CURRENT (µA)

PWD (ps)

30

40

60

50

70

80

90

100

-50 -10 10-30 30 50 70 90

SUPPLY CURRENT

vs. TEMPERATURE

MAX3866 TOC05

TEMPERATURE (°C)

SUPPLY CURRENT (mA)

3.14V

3.47V

1k 10k

100

105

110

115

120

130
125

135

140

1 10 100

OUTPUT VOLTAGE vs. INPUT CURRENT

MAX3866 TOC06

INPUT CURRENT (µA)

OUTPUT VOLTAGE (mVp-p)

ELECTRICAL EYE DIAGRAM

MAX3866 TOC08

50ps

INPUT = 8µAp-p, 2.5Gbps,
2

23

-1PRBS

R

L

= 100Ω DIFFERENTIAL

20mV/

div

ELECTRICAL EYE DIAGRAM

MAX3866 TOC09

50ps

20mV/

div

INPUT = 2.5mAp-p, 2.5Gbps,
2

23

-1PRBS

R

L

= 100Ω DIFFERENTIAL

Typical Operating Characteristics

(V

CCD

= V

CCS

= +3.3V, TA = +25°C, unless otherwise noted.)

MAX3866

2.5Gbps, +3.3V Combined
Transimpedance/Limiting Amplifier

4 _______________________________________________________________________________________

Typical Operating Characteristics (continued)

(V

CCD

= V

CCS

= +3.3V, TA = +25°C, unless otherwise noted.)

99
98
97

89

0.01 1 10

100

0.1

1000

SMALL-SIGNAL IMPEDANCE

vs. FREQUENCY

91
90

MAX3866 toc10

FREQUENCY (MHz)

TRANSIMPEDANCE

(20log (V

OUT

p-p/IN+))

93

96
95
94

92

0

10

5

20

15

25

30

7.717.28 8.14 8.57

DISTRIBUTION OF ELECTRICAL

SENSITIVITY (WORST CASE)

MAX3866 toc11

ELECTRICAL SENSITIVITY (µAp-p)

PERCENT OF UNITS (%)

VCC = +3.14V TO +5.5V
T

j

= +120°C

FUNCTION

VCCS

Positive Supply Voltage of Input Stage. Apply +3.3V if VCCD = +3.3V. If VCCD > +3.47V, disconnect from sup­ply and decouple to GND.

CHF+

External Filter Capacitor. A capacitor connected between CHF+ and CHF- is used for setting the low-frequency
cutoff.

PAD NAME

CHF-

External Filter Capacitor. A capacitor connected between CHF+ and CHF- is used for setting the low-frequency
cutoff.

FIL On-Chip Resistor for Filtering Photodiode Supply Voltage (connected to VCCD on chip)

PDC

The voltage at this node programs the gain of the power detector. Connect a resistor between PDC and INV to
adjust the LOP threshold.

IN- No Connect

IN+ Signal Input

GND Electrical Ground

OUT+ Noninverted Data-Signal Output

OUT- Inverted Data-Signal Output

CPD+

Filter Node for Power Detector. A capacitor connected between CPD+ and CPD- will provide additional filtering
to the rectifier output within the power detector.

CPD-

Filter Node for Power Detector. A capacitor connected between CPD+ and CPD- will provide additional filtering
to the rectifier output within the power detector.

INV

Used for programming the gain of the power detector. Connect a resistor between PDC and INV to adjust the
LOP threshold.

Pad Description

VCCD Power-Supply Voltage

LOP TTL Output, Loss-of-Power, active high