BEN should be equal to VCC
參數(shù)資料
型號： DS1875T+T&R
廠商： Maxim Integrated Products
文件頁數(shù)： 9/92頁
文件大小： 0K
描述： IC SFP CTRLR/TRIPLEXER 38-TQFN
產(chǎn)品培訓(xùn)模塊： Lead (SnPb) Finish for COTS
Obsolescence Mitigation Program
標準包裝： 2,500
應(yīng)用： 光纖
接口： I²C
電源電壓： 2.85 V ~ 3.9 V
封裝/外殼： 38-WFQFN 裸露焊盤
供應(yīng)商設(shè)備封裝： 38-TQFN（5x7）
包裝： 帶卷 (TR)
安裝類型： 表面貼裝
DS1875
DC Operation
When using autodetect mode or closed-loop mode,
BEN should be equal to VCC or long burst. In open-loop
mode, BEN should be ground or any burst length.
Modulation Control
The MOD output is an 8-bit scaleable voltage output
that interfaces with the MAX3643’s VMSET input. An
external resistor to ground from the MAX3643’s
MODSET pin sets the maximum current that the voltage
at the VMSET input can produce for a given output
range. This resistor value should be chosen to produce
the maximum modulation current the laser type requires
over temperature. Then the MOD output’s scaling is
used to calibrate the full-scale (FS) modulation output
to a particular laser’s requirements. This allows the
application to take full advantage of the MOD output’s
resolution. The modulation LUT can be programmed in
2°C increments over the -40°C to +102°C range.
Ranging of the MOD DAC is possible by programming
a single byte in Table 02h, Register 8Bh.
BIAS and MOD Output During Power-Up
On power-up the modulation and bias outputs remain off
until VCC is above VPOA, a temperature conversion has
been completed, and, if the VCC ADC alarm is enabled,
a VCC conversion above the customer-defined VCC low
alarm level must clear the VCC low alarm (tINIT). Once all
these conditions (tINIT) are satisfied, the MOD output is
enabled with the value determined by the temperature
conversion and the modulation LUT (Table 04h).
When the MOD output is enabled, the BIAS output is
turned on to a value equal to the temperature-indexed
value in the BIAS LUT (Table 08h). Next, the APC inte-
grator is enabled, and single LSB steps are taken to
tightly control the average power.
If a fault is detected and TX-D is toggled to re-enable
the outputs, the DS1875 powers up following a similar
sequence to an initial power-up. The only difference is
that the DS1875 already determined the present tem-
perature, so the tINIT time is not required for the
DS1875 to recall the APC and MOD set points from
EEPROM.
12
3
4
56
7
89
10
11
12
13
tINIT
VPOA
VMOD
IBIAS
VCC
BIAS
SAMPLE
APC INTEGRATOR ON
BIAS LUT
VALUE
Figure 1. Power-Up Timing (BEN is a Long Burst)
PON Triplexer and SFP Controller
______________________________________________________________________________________
17
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