MIC3001GML Micrel Inc, MIC3001GML Datasheet - Page 24

• Manufacturer Part Number: MIC3001GML
• Description: IC FOM MANAGEMENT W/CALIBR 24MLF
• Manufacturer: Micrel Inc
• Type: Transceiverr

Specifications of MIC3001GML

• Protocol: SDHj Sonet
• Voltage - Supply: 3 V ~ 3.6 V
• Mounting Type: Surface Mount
• Package / Case: 24-MLF®, QFN
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Number Of Drivers/receivers: -
• Other names: 576-1753-5; MIC3001GML

Micrel, Inc.
Power ON and Laser Start-Up
When power is applied, the MIC3001 initializes its
internal registers and state machine. This process takes
t POR , about 50ms. Following t POR , analog-to-digital
conversions begin, serial communication is possible, and
the POR bit and data ready bits may be polled. The first
set of analog data will be available t CONV after t POR .
MIC3001s are shipped from the factory with the output
enable bit, OE, set to zero, off. The MIC3001’s power-up
default state, therefore, is APC off, V BIAS , V MOD , and
SHDN outputs disabled. V BIAS , V MOD , and SHDN will
be floating (high impedance) and the laser diode, if
connected, will be off. Once the device is incorporated
into a transceiver and properly configured, the shutdown
states of SHDN, V BIAS and V MOD will be determined
by the state of the APC configuration and OE bits. Table
10, Table 11, and Table 12 illustrate the shutdown states
of the various laser control outputs versus the control
bits.
August 2004
Table 10. Shutdown State of SHDN vs.
Configuration Bits
OE
0
1
1
Configuration Bits
Don’t Care
SPOL
0
1
Shutdown State
SHDN
≈GND
≈V DD
Hi-Z
24
In order to facilitate hot-plugging, the laser diode is not
turned on until t
assuming TXDISABLE is not asserted, the DACs will be
loaded with their initial values. Since t
than t
temperature,
compensation will be applied to the DAC values if
enabled. APC will begin if OE is asserted. (If the output
enable bit, OE, is not set, the V
outputs will float indefinitely.) Figure 8 shows the power-
up timing of the MIC3001. If TXDISABLE is asserted at
power-up, the V
shutdown states following MIC3001 initialization. A/D
conversions will begin, but the laser will remain off.
OE
OE
0
1
1
0
1
1
Configuration Bits
Configuration Bits
INIT2
Don’t Care
Don’t Care
Don’t Care
Table 11. Shutdown State of V
Table 12. Shutdown State of V
, the first set of analog data, including
INV
Don’t Care
MODREF
is
INIT2
MOD
[e-mail]
0
1
Configuration Bits
Configuration Bits
available
after power-on. Following t
Don’t Care
and V
BIASREF
0
1
BIAS
at
outputs will stay in their
V
MOD
MOD
V
t
BIAS
INIT2
, V
Shutdown State
CONV
or [phone]
M9999-082404-A
BIAS
MOD
BIAS
Shutdown State
≈GND
.
≈V DD
V
Hi-Z
MOD
≈GND
≈V DD
V
Hi-Z
Temperature
vs.
vs.
is much less
, and SHDN
BIAS
MIC3001
INIT2
, and