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| 型号： | MIC3003GFL |
| 厂商： | Micrel Inc |
| 文件页数： | 22/74页 |
| 文件大小： | 0K |
| 描述： | IC FOM MANAGEMENT W/CALIBR 24 ML |
| 标准包装： | 100 |
| 类型： | 激光二极管控制器（光纤） |
| 数据速率： | 10Gbps |
| 通道数： | 1 |
| 电源电压： | 3 V ~ 3.6 V |
| 电流 - 电源： | 2.3mA |
| 工作温度： | -40°C ~ 105°C |
| 封装/外壳： | 24-VFQFN 裸露焊盘，24-MLF? |
| 供应商设备封装： | 24-MLF?（3x3） |
| 包装： | 管件 |
| 安装类型： | 表面贴装 |
| 其它名称： | 576-3776-5 |
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Micrel, Inc.
MIC3003GFL
( 0 . 3 V )
Calibration Modes
The default mode of calibration in the MIC3003 is
external calibration, for which the INTCAL bit (bit 0 in
I BIAS =
IBIASh
255
R SENSE
(1)
OEMCFG3 register) is set to 0. The internal calibration
mode is selected by setting INTCAL to 1.
The value of the least significant bit (LSB) of IBIASh is
given by:
A/ External Calibration
The voltage and temperature values returned by the
LSB ( IBIASh ) =
0 . 3 v
255 × R SENSE
Amps =
300 mV
255 × R SENSE
K × ( 1220 mV )
PTX ( mW ) =
=
MIC3003’s A/D converter are internally calibrated. The
binary values of TEMPh:TEMPl and VOLTh:VOLTl are in
the format called for by SFF-8472 under Internal
Calibration.
SFF-8472 calls for a set of calibration constants to be
stored by the transceiver OEM at specific non-volatile
memory locations; refer to the SFF-8472 specifications
for the memory map of the calibration coefficients. The
MIC3003 provides the non-volatile memory required for
the storage of these constants. The Digital Diagnostic
Monitoring Interface specification should be consulted
for full details. Slopes and offsets are stored for use with
voltage, temperature, bias current, and transmitted
power measurements. Coefficients for a fourth-order
polynomial are provided for use with received power
measurements. The host system can retrieve these
constants and use them to process the measured data.
Voltage
The voltage values returned by the MIC3003’s A/D
converter are internally calibrated. The binary values of
VOLTh:VOLTl are in the format called for by SFF-8472
under Internal Calibration. Since VINh:VINl requires no
processing, the corresponding slope should be set to
one and the offset to zero.
Temperature
The temperature values returned by the MIC3003’s A/D
converter are internally calibrated. The binary values of
TEMPh:TEMPl are in the format called for by SFF-8472
under Internal Calibration.
The temperature value may be offset by storing a value
in A6:74(4Ah). The temperature offset is a six-bit signed
quantity with .5 degrees C resolution.
The temperature offset coefficient at A6:74(4Ah) is used
in the same way in both internal and external calibration
modes.
Bias Current
Bias current is sensed via an external sense resistor as
a voltage appearing between VILD+ and VILD-. The
value returned by the A/D is therefore a voltage
analogous to bias current. Bias current, IBIAS, is simply
V VILD /R SENSE . The binary value in IBIASh (IBIASl is
always zero) is related to bias current by:
1176 . 9
mA = μ A (2)
R SENSE
Per SFF-8472, the value of the bias current LSB is 2μA.
The necessary conversion factor, “slope”, is therefore:
1176 . 5 μ A
Slope = = 2 . 298 + R SENSE
512 μ A × R SENSE
The tolerance of the sense resistor directly impacts the
accuracy of the bias current measurement. It is
recommended that the sense resistor chosen be 1%
accurate or better. The offset correction, if needed, can
be determined by shutting down the laser, i.e., asserting
TXDISABLE, and measuring the bias current. Any non-
zero result gives the offset required. The offset will be
equal and opposite to the result of the “zero current”
measurement.
TX Power
Transmit power is sensed via a resistor carrying the
monitor photodiode current. In most applications, the
signal at VMPD will be feedback voltage on FB. The
VMPD voltage may be measured relative to GND or
V DDA depending on the setting of the BIASREF bit in
OEMCFG1. The value returned by the A/D is therefore a
voltage analogous to transmit power. The binary value in
TXOPh (TXOPl is always zero) is related to transmit
power by:
TXOPh TXOPh
K × VREF
255 255
R SENSE R SENSE
K × 4 . 7843 × TXOPh
= mW (3)
R SENSE
For a given implementation, the value of R SENSE is
known. It is either the value of the external resistor or the
selected internal value of R FB . The constant, K, will likely
have to be determined through experimentation or
closed-loop calibration, as it depends on the monitoring
photodiode responsively and coupling efficiency.
It should be noted that the APC circuit acts to hold the
transmitted power constant. The value of transmit power
reported by the circuit should only vary by a small
amount as long as the APC is functioning correctly.
July 2010
22
M9999-072910-A
hbwhelp@micrel.com or (408) 955-1690
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相关代理商/技术参数 |
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|---|---|
| MIC3003GFL TR | 功能描述:网络控制器与处理器 IC FOM Controller with Internal Calibration in Ultra Small Package RoHS:否 制造商:Micrel 产品:Controller Area Network (CAN) 收发器数量: 数据速率: 电源电流（最大值）:595 mA 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:PBGA-400 封装:Tray |
| MIC3003GFLTR | 制造商:MICREL 制造商全称:Micrel Semiconductor 功能描述:FOM Management IC with Internal Calibration |
| MIC3003GML | 功能描述:网络控制器与处理器 IC FOM Controller with Internal Calibration RoHS:否 制造商:Micrel 产品:Controller Area Network (CAN) 收发器数量: 数据速率: 电源电流（最大值）:595 mA 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:PBGA-400 封装:Tray |
| MIC3003GML TR | 功能描述:网络控制器与处理器 IC FOM Controller with Internal Calibration RoHS:否 制造商:Micrel 产品:Controller Area Network (CAN) 收发器数量: 数据速率: 电源电流（最大值）:595 mA 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:PBGA-400 封装:Tray |
| MIC3003GML-EVAL | 制造商:Micrel Inc 功能描述:FOM CONTROLLER WITH INTERNAL C |
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