1.25Gbps/2.5Gbps, +3V to +5.5V, Low-Noise

Transimpedance Preamplifiers for LANs

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3

Note 1: Source Capacitance represents the total capacitance at the IN pin during characterization of noise and bandwidth parame-

ters. Figure 1 shows the typical source capacitance vs. reverse voltage for the photodiode used during characterization of

TO-56 header packages. Noise and bandwidth will be affected by the source capacitance. See the Typical Operating

Characteristics for more information.

Note 2: Input-Referred Noise is calculated as RMS Output Noise / (Gain at f = 10MHz). Noise Density is (Input-Referred Noise) /

√bandwidth. No external filters are used for the noise measurements.

Note 3: Deterministic Jitter is measured with the K28.5 pattern applied to the input [00111110101100000101].

Peak-to-peak, 0.95 < linearity < 1.05

SO package (Note 2)

Differential, measured with 40µAp-p signal

Power-Supply Rejection Ratio

(PSRR)

50

dB

Output referred, f < 2MHz,

PSRR = -20log (

Transimpedance Linear Range

40

µAp-p

Low-Frequency Cutoff

24

kHz

Small-Signal Bandwidth

1515

1900

2550

MHz

-3dB, input

≤ 20µA DC

Deterministic Jitter

14

50

Input-Referred RMS Noise

485

668

nA

(Note 2)

DC Input Overload

AC Input Overload

1.0

mAp-p

0.65

mA

ps

PARAMETER

MIN

TYP

MAX

UNITS

Filter Resistor

1210

1500

1865

Ω

Input-Referred Noise Density

11.0

Output Impedance

47.7

50

52.1

Ω

Transimpedance

Ω

Supply Current

Input Bias Voltage

0.67

0.83

0.97

V

26

53.2

mA

1470

1900

2355

CONDITIONS

Single ended (per side)

Maximum Differential Output

Voltage

155

250

430

mVp-p

Input = 1mAp-p

(Note 3)

ELECTRICAL CHARACTERISTICS—MAX3267E

source capacitance = 0.85pF, unless otherwise noted.) (Note 1)