Rainbow-electronics MAX3798 Manual do Utilizador descarregar pdf (Página 5)

MAX3798

1.0625Gbps to 10.32Gbps, Integrated, Low-

Power SFP+ Limiting Amplifier and VCSEL Driver

_______________________________________________________________________________________ 5

ELECTRICAL CHARACTERISTICS (continued)

= 2.85V to 3.63V, T

= -40°C to +85°C, CML receiver output load is AC-coupled to differential 100Ω, C

= 1nF, transmitter out-

put load is AC-coupled to differential 100Ω (see Figure 1), typical values are at +25°C, V

= 3.3V, I

BIAS

= 6mA, I

MOD

= 6mA, unless

otherwise specified. Registers are set to default values unless otherwise noted, and the 3-wire interface is static during measure-

ments. For testing, the MODE_SEL bit was used and the MSEL pin was left open.)

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

Random Jitter

5mA  I

MOD

 12mA, 250mV

P-P

 V



800mV

P-P

0.17 0.5 ps

RMS

DUT is powered on, f  5GHz 12

Output Return Loss SDD22

DUT is powered on, f  16GHz 5

Tx BIAS GENERATOR

Maximum Bias-On Current I

BIASMAX

Current into BIAS pin 15 mA

Minimum Bias-On Current I

BIASMIN

Current into BIAS pin 2 mA

BIAS Current DAC Stability 2mA  I

BIAS

 15mA (Notes 2, 10) 4 %

Compliance Voltage at BIAS V

BIAS

0.9 2.1 V

BIAS Current Monitor Current

Gain

BMON

External resistor to GND defines the

voltage gain

16 mA/A

Compliance Voltage at BMON V

BMON

0 1.8 V

BIAS Current Monitor Current

Gain Stability

BMON

2mA  I

BIAS

 15mA (Note 10) 5 %

Tx SAFETY FEATURES

Excessive Voltage at BMAX V

BMAX

Average voltage, FAULT always occurs for

BMAX

 V

- 0.65V, FAULT never occurs

for V

BMAX

 V

- 0.55V

0.65V

0.6V

0.55V

Excessive Voltage at MMAX V

MMAX

Average voltage, FAULT always occurs for

MMAX

 V

- 0.65V, FAULT never occurs

for V

MMAX

 V

- 0.55V

0.65V

0.6V

0.55V

Excessive Voltage at BMON V

BMON

Average voltage, FAULT warning always

occurs for V

BMON

 V

- 0.55V, FAULT

warning never occurs for V

BMON

 V

0.65V

0.6V

0.55V

Excessive Voltage at BIAS V

BIAS

Average voltage, FAULT always occurs for

BIAS

 0.44V, FAULT never occurs for

BIAS

 0.65V

0.44 0.48 0.65 V

Maximum VCSEL Current in Off

State

OFF

FAULT or DISABLE, V

BIAS

= V

25 μA

SFP TIMING REQUIREMENTS

Mode-Select Change Time t_

MODESEL

Time from rising or falling edge at MSEL

until Rx output PWD falls below 10ps

10 μs

DISABLE Assert Time t_

OFF

Time from rising edge of DISABLE input

signal to I

BIAS

= I

BIASOFF

and I

MOD

MODOFF

1 μs

1 2 3 4 5 6 7 8 9 10 ... 34 35

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