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參數(shù)資料
| 型號： | MAX3288CUE |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類： | 其它接口 |
| 英文描述： | 32-Bit Digital Signal Controller with Flash 128-LQFP -40 to 85 |
| 中文描述： | SPECIALTY INTERFACE CIRCUIT, DSO16 |
| 封裝： | TSSOP-16 |
| 文件頁數(shù)： | 10/28頁 |
| 文件大?。?/td> | 1446K |
| 代理商： | MAX3288CUE |
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M
3.0V to 5.5V, 1.25Gbps/2.5Gbps
LAN Laser Drivers
10
______________________________________________________________________________________
impedance). This ensures that the PNP or NPN transistor
is turned off, removing the laser-bias current. (See the
Applications Information
section.)
The REF pin provides a controlled reference voltage
dependent upon the voltage at MON. The voltage at REF
is V
REF
= 2.65 - 2.25(V
CC
- V
MON
). A resistor connected
at REF determines the laser power when APC is used
with common-cathode lasers. See the
Design Procedure
section for information about setting the laser power.
Modulation Circuitry
The modulator circuitry consists of an input buffer, current
generator, and high-speed current switch (Figure 4). The
modulator drives up to 30mA of modulation current into
a 25
load.
Many of the modulator performance specifications
depend on the total modulator current (I
OUT
) (Figure 1a).
To ensure good driver performance, the voltage at
OUT+ and OUT- must not be less than V
CC
- 1V.
The amplitude of the modulation current is set with
resistors at the MODSET and temperature coefficient (TC)
pins. The resistor at MODSET (R
MOD
) programs the
temperature-stable portion of modulation current, while
the resistor at TC (R
TC
) programs the temperature-
increasing portion of the modulation current. Figure 5
shows modulation current as a function of temperature
for two extremes: R
TC
is open (the modulation current
has zero temperature coefficient) and R
MOD
is open
(the modulation temperature coefficient is 4000ppm).
Intermediate tempco values of modulation current can
be obtained as described in the
Design Procedure
sec-
tion. Table 3 is the R
TC
and R
MOD
selection table.
Safety Circuitry
The laser driver can be used with two popular safety
systems. APC maintains laser safety using local feed-
back. Safety features monitor laser driver operation and
SMOOTH-
START
POLARITY_FAULT
ENABLE
WINDOW
COMPARATOR
MD
FAULT
REF_FAULT
MONITOR_FAULT
V
CC
- 540mV
BIASDRV
MON
POL
POL
MD
REF
POWER-
CONTROL
AMPLIFIER
+1.7V
CONTROLLED REFERENCE VOLTAGE
V
REF
= 2.65 - 2.25 (V
CC
- V
MON
)
+1.97V
2.95V
+1.53V
GLITCH
REJECT
ENABLE
Figure 3. Bias Generator Circuitry
V
CC
CURRENT
SWITCH
INPUT
BUFFER
OUT+
OUT-
IN+
IN-
50
50
400
400
V
CC
- 0.3V
CURRENT AMPLIFIER
4000ppm/
°
C
REFERENCE
ENABLE
0.8V
TC
MODSET
R
TC
R
MOD
0.8V
TC_FAULT
MOD_FAULT
MODULATION CURRENT
GENERATOR
1.2V
REFERENCE
MAX3286
MAX3296
Figure 4. Laser Modulator Circuitry
53.6
18.7
1.69
2.0
R
MOD
(k
)
R
TC
(k
)
I
MOD
= 15mA
11.5
13.3
26.7
9.53
3500
3000
162
57.6
R
MOD
(k
)
R
TC
(k
)
I
MOD
= 30mA
R
MOD
(k
)
I
MOD
= 5mA
3.65
4.32
R
TC
(k
)
TEMPCO
(ppm/°C)
8.06
6.19
3.16
4.32
11.3
2.49
20.0
26.7
4.12
3.24
2000
1500
24.9
19.1
5.76
2500
16.2
34.8
6.49
8.87
5.23
4.22
13.3
5.11
6.49
80.6
2.26
500
13.3
2.67
1000
40.2
15.8
26.7
13.3
Table 3. R
TC
and R
MOD
Selection Table
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX3288CUE-T | 功能描述:激光驅(qū)動器 NULL RoHS:否 制造商:Micrel 數(shù)據(jù)速率:4.25 Gbps 工作電源電壓:3 V to 3.6 V 電源電流:80 mA 最大工作溫度:+ 85 C 封裝 / 箱體:QFN-16 封裝:Tube |
| MAX3289CUE | 功能描述:激光驅(qū)動器 20Mbps +3.3V SOT23 RS-485/RS-422 Transmitters RoHS:否 制造商:Micrel 數(shù)據(jù)速率:4.25 Gbps 工作電源電壓:3 V to 3.6 V 電源電流:80 mA 最大工作溫度:+ 85 C 封裝 / 箱體:QFN-16 封裝:Tube |
| MAX3289CUE-T | 功能描述:激光驅(qū)動器 20Mbps +3.3V SOT23 RS-485/RS-422 Transmitters RoHS:否 制造商:Micrel 數(shù)據(jù)速率:4.25 Gbps 工作電源電壓:3 V to 3.6 V 電源電流:80 mA 最大工作溫度:+ 85 C 封裝 / 箱體:QFN-16 封裝:Tube |
| MAX328C/D | 功能描述:多路器開關(guān) IC RoHS:否 制造商:Texas Instruments 通道數(shù)量:1 開關(guān)數(shù)量:4 開啟電阻（最大值）:7 Ohms 開啟時間（最大值）: 關(guān)閉時間（最大值）: 傳播延遲時間:0.25 ns 工作電源電壓:2.3 V to 3.6 V 工作電源電流: 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:UQFN-16 |
| MAX328CJE | 功能描述:多路器開關(guān) IC RoHS:否 制造商:Texas Instruments 通道數(shù)量:1 開關(guān)數(shù)量:4 開啟電阻（最大值）:7 Ohms 開啟時間（最大值）: 關(guān)閉時間（最大值）: 傳播延遲時間:0.25 ns 工作電源電壓:2.3 V to 3.6 V 工作電源電流: 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:UQFN-16 |
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