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参数资料
| 型号： | MIC3000BMLTR |
| 厂商： | MICREL INC |
| 元件分类： | 数字传输电路 |
| 英文描述： | ATM/SONET/SDH SUPPORT CIRCUIT, QCC24 |
| 封装： | 4 X 4 MM, MLF-24 |
| 文件页数： | 64/68页 |
| 文件大小： | 444K |
| 代理商： | MIC3000BMLTR |
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October 2004
67
M9999-101204
MIC3000
Micrel
Power Supplies
The MIC3000 has separate power supply and ground pins for
both the analog and digital supplies. This helps prevent digital
switching noise from corrupting the analog functions. The
individual supply and ground pins are not isolated from one
another inside the IC. Separate analog and digital power and
ground planes are NOT required on the PCB. Having one of
each plane (power and ground) is certainly good practice,
however. If dedicated power and ground layers are not
available, care should be taken to route the digital supply and
return currents back to the supply separate from the analog
supply connections. A schematic of this approach is shown in
Figure 36. Each supply should be bypassed as close to the
IC as possible with 0.01
F capacitor (Low ESR capacitors
such as ceramics are preferred.) as shown. This assumes
that bulk capacitance is already present upstream. If no other
filter capacitance is present nearby, a 1
F filter capacitor
should be added in parallel to the 0.01
F capacitor.
VDDD
C3
(1)
0.01
F
C4
1.0
F
C1
(1)
1.0
F
C2
0.01
F
MIC3000
GNDD
HOST P/S (+)
HOST P/S (–)
VDDA
GNDA
Ground Plane
Power Plane
Figure 36. Power Supply Routing and Bypassing
Using The MIC3000 In a 5V System
It is fairly straightforward to use the MIC3000 in a system
powered from a 5V rail. In these systems, the laser diode
driver IC will usually be powered from the 5V rail. A small
linear regulator, such as Micrel’s MIC5213, can be used to
generate a 3.3V power supply rail if one does not otherwise
exist in the system. All of the MIC3000’s digital I/O’s except
for RSOUT are 5V tolerant and may be pulled up to 5.5V
regardless of the MIC3000’s supply voltage. They can be
connected directly to a 5V host. The MIC5213 is ideal, as it is
capable of supplying up to 80mA, is in a tiny SC-70 package,
and is stable with small ceramic output capacitors.
The laser diode driver interface will be unchanged in most
cases. Ground referred voltages and currents can be gener-
ated the same way as with 3.3V-powerd drivers. The excep-
tion is drivers that are controlled by a voltage referenced to
VDD such as the SY89307. The MIC3000’s VBIAS or VMOD
output will be referenced to its own 3.3V power supply
whereas the driver’s input will be referenced to its 5V power
supply. The solution is a simple level-shifting circuit that
converts the VBIAS/VMOD output into a current and then into
a VDD-referenced voltage.
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| MIC3808YMTR | 1 A SWITCHING CONTROLLER, 1000 kHz SWITCHING FREQ-MAX, PDSO8 |
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