MAX3799(2009) 데이터 시트보기 (PDF) - Maxim Integrated

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MAX3799
(Rev.:2009)

1Gbps to 14Gbps, SFP+ Multirate Limiting Amplifier and VCSEL Driver

Maxim Integrated 

1Gbps to 14Gbps, SFP+ Multirate Limiting

Amplifier and VCSEL Driver

ELECTRICAL CHARACTERISTICS (continued)

(VCC = 2.85V to 3.63V, TA = -40°C to +85°C, CML receiver output load is AC-coupled to differential 100Ω, CAZ = 1nF, transmitter out-

put load is AC-coupled to differential 100Ω (see Figure 1), typical values are at +25°C, VCC = 3.3V, IBIAS = 6mA, IMOD = 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 RATE_SEL bit was used and the RSEL pin was left open.)

PARAMETER

SYMBOL

CONDITIONS

BIAS Current DAC Stability

Compliance Voltage at BIAS

VBIAS

2mA
IBIAS
15mA (Notes 2, 10)

BIAS Current Monitor Current

Gain

IBMON

External resistor to GND defines the

voltage gain

Compliance Voltage at BMON

VBMON

BIAS Current Monitor Current

Gain Stability

IBMON 2mA
IBIAS
15mA (Note 10)

Tx SAFETY FEATURES

Excessive Voltage at BMON

VBMON

Average voltage, FAULT warning always

occurs for VBMON  VCC - 0.55V, FAULT

warning never occurs for VBMON
VCC -

0.65V

Excessive Voltage at BIAS

Maximum VCSEL Current in Off

State

VBIAS

IOFF

Average voltage, FAULT always occurs for

VBIAS
0.44V, FAULT never occurs for

VBIAS  0.65V

FAULT or DISABLE, VBIAS = VCC

SFP TIMING REQUIREMENTS

DISABLE Assert Time

DISABLE Negate Time

t_OFF

t_ON

Time from rising edge of DISABLE input

signal to IBIAS = IBIASOFF and IMOD =

IMODOFF

Time from falling edge of DISABLE to IBIAS

and IMOD at 90% of steady state when

FAULT = 0 before reset

FAULT Reset Time of Power-On

Time

t_INIT

Time from power-on or negation of FAULT

using DISABLE

FAULT Reset Time

DISABLE to Reset

t_FAULT

Time from fault to FAULT on,

CFAULT
20pF, RFAULT = 4.7k

Time DISABLE must be held high to reset

FAULT

OUTPUT_LEVEL VOLTAGE DAC (SET_CML)

Full-Scale Voltage

Resolution

VFS

100
differential resistive load

Integral Nonlinearity

INL

5mA
ICML_LEVEL
20mA

LOS THRESHOLD VOLTAGE DAC (SET_LOS)

Full-Scale Voltage

VFS

Resolution

Integral Nonlinearity

INL

11mVP-P
VTH_LOS
94mVP-P

BIAS CURRENT DAC (SET_IBIAS)

Full-Scale Current

IFS

MIN

0.9

0

VCC -

0.65V

0.44

5

TYP

16

VCC -

0.6V

0.48

1200

5

±0.9

94

1.5

±0.7

21

MAX

4

2.1

1.8

5

VCC -

0.55V

0.65

25

1

500

100

10

UNITS

%

V

mA/A

V

%

V

V

μA

μs

μs

ms

μs

μs

mVP-P

mVP-P

LSB

mVP-P

mVP-P

LSB

mA

_______________________________________________________________________________________ 5

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