MAX3945ETE データシートの表示（PDF） - Maxim Integrated
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MAX3945ETE Datasheet PDF : 28 Pages
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1.0625Gbps to 11.3Gbps, SFP+ Laser Driver
with Laser Impedance Mismatch Tolerance
ELECTRICAL CHARACTERISTICS (continued)
(VCC = +2.85V to +3.63V, TA = -40°C to +85°C, and Figure 1. Guaranteed by design and characterization from TA = -40°C to +95°C.
Typical values are at VCC = +3.3V, IBIAS = 60mA, IMOD = 40mA, 25I differential output load, and TA = +25°C, unless otherwise
noted.) (Note 1)
PARAMETER
SAFETY FEATURES
Threshold Voltage at BMAX
SYMBOL
CONDITIONS
VBMAX
FAULT always occurs for VBMAX R 1.3,
FAULT never occurs for VBMAX < 1.1
(Note 1, Figure 1)
MIN TYP MAX UNITS
1.1
1.2
1.3
V
Threshold Voltage at BIAS
Threshold Voltage at BMON
SFP TIMING REQUIREMENTS
DISABLE Assert Time
DISABLE Negate Time
FAULT Reset Time of Power-On
Time
FAULT Reset Time
DISABLE to Reset
BIAS CURRENT DAC
Full-Scale Current
LSB Size
Integral Nonlinearity
VBIAS
VBMON
FAULT never occurs for VBIAS R 0.57,
FAULT always occurs for VBIAS < 0.44
Warning always occurs for VBMON R
VCC - 0.5V, warning never occurs for
VBMON < VCC - 0.7V
0.44 0.48 0.57
VCC - VCC - VCC -
0.7
0.6
0.5
t_OFF
Time from rising edge of DISABLE input
signal to IBIAS < IBIAS-OFF and IMOD <
IMOD-OFF
0.05
1
t_ON
Time from falling edge of DISABLE to IBIAS
and IMOD at 90% of steady state
0.5
5
t_INIT
Time from power-on or negation of FAULT
using DISABLE
50
200
t_FAULT
Time from fault to FAULT on, CFAULT P
20pF, RFAULT = 4.7kI
0.5
2
Time DISABLE must be held high to reset
FAULT
0.5
IBIAS-FS SET_IBIAS[8:1] = HxFF
INL
5mA P IBIAS P 80mA
80
100
190
±0.5
V
V
Fs
Fs
Fs
Fs
Fs
mA
FA
%FS
Differential Nonlinearity
DNL
5mA P IBIAS P 80mA, guaranteed mono-
tonic at 8-bit resolution SET_IBIAS[8:1]
±0.5
LSB
MODULATION CURRENT DAC (25I DIFFERENTIAL LOAD)
Full-Scale Current
IMOD-FS SET_IMOD[8:1] = HxFF
LSB Size
Integral Nonlinearity
INL
10mA P IMOD P 80mA
80
105
200
Q1
Differential Nonlinearity
DNL
10mA P IMOD P 80mA, guaranteed mono-
tonic at 9-bit resolution SET_IMOD[8:0]
Q0.5
mA
FA
%FS
LSB
CONTROL I/O SPECIFICATIONS
DISABLE Input Current
IIH
IIL
DISABLE Input High Voltage
VIH
DISABLE Input Low Voltage
VIL
Depends on pullup resistance
12
FA
500 800
1.8
VCC
V
0
0.8
V
4 _______________________________________________________________________________________
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