参数资料
| 型号： | MAX3967AETG+T |
| 厂商： | Maxim Integrated |
| 文件页数： | 6/14页 |
| 文件大小： | 0K |
| 描述： | IC SFP LED DRVR 24-TQFN |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 类型： | 激光二极管驱动器，用于光纤模块 |
| 数据速率： | 270Mbps |
| 通道数： | 1 |
| 电源电压： | 2.97 V ~ 5.5 V |
| 电流 - 电源： | 30mA |
| 电流 - 调制： | 可调式 |
| 工作温度： | -40°C ~ 85°C |
| 封装/外壳： | 24-WFQFN 裸露焊盘 |
| 供应商设备封装： | 24-TQFN-EP（4x4） |
| 包装： | 带卷 (TR) |
| 安装类型： | 表面贴装 |
270Mbps SFP LED Driver
Pin Description
PIN
1
2
3, 4, 5
6, 7
8, 9
10, 11
12, 16
13, 14
15, 19
17
18
20
21
22
23
24
EP
NAME
TCNOM
TC
PB1, PB2, PB3
V EEOUT
OUT+
OUT-
N.C.
V CCOUT
V CC
MON
MODSET
IN-
IN+
TX_DISABLE
V EE
TCMIN
Exposed Pad
FUNCTION
Shorting TC to TCNOM provides a modulation tempco of approximately 3600ppm/°C.
A resistor (R TC ) connected between the TC and TCMIN pins sets the tempco of the modulation
current. Leaving R TC unconnected provides the maximum tempco.
Programs the Prebias Voltage at the OUT+ Pin (Table 1)
Ground for the Output-Current Drivers
Current Output
Complementary Current Output
No Connection. Not internally connected.
Supply Connection for the Output-Current Drivers
Provides Current to the Internal Amplifiers
The Current Sourced from the MON Pin is Proportional to the Modulator Current
A Resistor from MODSET to V EE Programs the LED Modulation Current
Inverting Data Input
Noninverting Data Input
Transmit Disable. When high, the current at the OUT+ pins is in the low state. The transmitter is
enabled when TX_DISABLE is open.
Ground for internal amplifiers.
Shorting TC to TCMIN provides the minimum modulation-current tempco.
Connect the exposed pad to board ground for optimal correct electrical and thermal performance.
Detailed Description
The MAX3967A provides a flexible current drive for the
modulation of fiber optic light-emitting diodes (LEDs).
The circuit is designed to be used with +3.3V or +5V
power supplies. The IC provides up to 100mA of modu-
lation current. An adjustable prebias current source sets
the LED prebias voltage. An integrated resistor provides
passive peaking and optical pulse-width compensation.
Figure 2 shows a block diagram of the MAX3967A,
which comprises a reference-voltage generator, modu-
lation-current generator, input buffer with disable, pre-
bias-current generator, main output driver,
complementary output driver, and LED-compensation
network.
Temperature Compensation
The reference-voltage generator circuit provides two
voltage sources that create modulation-current tempera-
ture compensation. A positive modulation-current tem-
perature coefficient (tempco) is useful to compensate
for the temperature characteristics of typical fiber optic
LEDs. The first source has a temperature-stable output.
The second source has a temperature-increasing output
with a tempco of approximately 12,000ppm/°C (relative
to +25°C). A resistor-divider between the two reference
generators programs the modulation-current tempco.
For maximum modulation-current tempco, leave the TC
pin disconnected. For a tempco of approximately
3600ppm/°C, connect TC to TCNOM. To obtain the mini-
mum tempco, connect TCMIN to TC. Intermediate temp-
co values can be programmed by connecting an
external resistor (R TC ) between TCMIN and TC.
Input Buffer
The inputs are connected to the PECL-compatible differ-
ential input buffer. If left unconnected, IN+ is internally
pulled to a PECL low and IN- is pulled to a PECL high,
causing low current at OUT+. The input impedance of
IN+ and IN- is approximately 50k ? .
6
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| MAX3967AEVKIT | 功能描述:LED 照明开发工具 Evaluation Kit for the MAX3967A RoHS:否 制造商:Fairchild Semiconductor 产品:Evaluation Kits 用于:FL7732 核心: 电源电压:120V 系列: 封装: |
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