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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： | 11/68页 |
| 文件大小： | 444K |
| 代理商： | MIC3000BMLTR |
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October 2004
19
M9999-101204
MIC3000
Micrel
VBIAS Shutdown
Configuration Bits
State
OE
INV
BIASREF
VBIAS
0
Don’t Care
Hi-Z
1
Don’t Care
0
GND
1
Don’t Care
1
VDD
Table 9. Shutdown State of VBIAS vs.
Configuration Bits
VMOD Shutdown State
OE
MODREF
VMOD
0
Don’t Care
Hi-Z
1
0
GND
11
VDD
Table 10. Shutdown state of VMOD vs.
Configuration bits
In order to facilitate hot-plugging, the laser diode is not turned
on until tINIT2 after power-on. Following tINIT2, and assuming
TXDISABLE is not asserted, the DACs will be loaded with
their initial values. Since tCONV is much less than tINIT2, the
first set of analog data, including temperature, is available at
tINIT2. 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 VMOD, VBIAS, and SHDN
outputs will float indefinitely.) Figure 7 shows the power-up
timing of the MIC3000. If TXDISABLE is asserted at power-
up, the VMOD and VBIAS outputs will stay in their shutdown
states following MIC3000 initialization. A/D conversions will
begin, but the laser will remain off.
Power ON and Laser Start-Up
When power is applied, the MIC3000 initializes its internal
registers and state machine. This process takes tPOR, about
50
s. 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 tCONV after tPOR. MIC3000s are shipped from the
factory with the output enable bit, OE, set to zero, off. The
MIC3000’s power-up default state, therefore, is APC off,
VBIAS, VMOD, and SHDN outputs disabled. VBIAS, VMOD, 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, VBIAS and VMOD will be determined by the state of the
APC configuration and OE bits. Table 8, Table 9, and Table
10 illustrate the shutdown states of the various laser control
outputs versus the control bits.
Configuration Bits
Shutdown State
OE
SPOL
SHDN
0
Don’t Care
Hi-Z
1
0
GND
11
VDD
Table 8. Shutdown State of SHDN vs.
Configuration Bits
tINIT
tCONV
tON
(2)
tPOR
VPOR
TXFAULT
TXDISABLE
|V
MOD|
|V
BIAS|
TX Output
(a) MIC3000 Power-On, TXDISABLE not Asserted
SHDN
(1)
/DATA_READY
VDD
90% nominal output
TX Output
(b) MIC3000 Power-On, TXDISABLE Asserted
tINIT
tCONV
tPOR
VPOR
TXFAULT
TXDISABLE
|V
MOD|
|V
BIAS|
SHDN
(1)
/DATA_READY
VDD
Notes:
1. Polarity programmable; active-high shown.
2. Determined by loop response, e.g., CCOMP.
Figure 7. MIC3000 Power-On Timing (OE=1)
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