参数资料
型号: DS1884T+T
厂商: Maxim Integrated Products
文件页数: 17/92页
文件大小: 0K
描述: IC SFP PON ONU CTRLR 24TQFN
产品培训模块: Lead (SnPb) Finish for COTS
Obsolescence Mitigation Program
产品变化通告: DS1884 Series Discontinuation 03/Aug/2012
标准包装: 2,500
系列: *
DS1884
SFP and PON ONU Controller
with Digital LDD Interface
24
Maxim Integrated
Figure 7. Low-Voltage Hysteresis Example
Delta-Sigma Output and Reference
One delta-sigma output (DAC) is provided. This provides
a 9-bit resolution output. The maximum voltage output is
set by the input REFIN. An inexpensive shunt reference is
recommended to generate the voltage applied to REFIN,
as shown in Figure 8. The output includes the ability to
compensate the APD bias for temperature as given by
the following formula:
DAC_INT = TINDEX[6:0] + DAC OFFSET
If INV_DAC = 0, then DAC[9:0] = DAC_INT/DACFS x
VREFIN.
If INV_DAC = 1, then DAC[9:0] = [3FF - (DAC_INT/
DACFS)] x VREFIN.
where:
1) INV_DAC is at A2h Table 02h, Register 8Dh, bit 7.
3) DAC OFFSET is an 8-bit value, representing the 8
MSBs of a 10-bit value. The two LSBs are 0.
4) DACFS (A2h Table 02h, Register 88h) is an 8-bit
value, representing the 8 MSBs of a 10-bit value. The
two LSBs are 0.
5) DAC is a 10-bit value.
6) The DAC[9:0] is clamped at DACFS.
7) DAC_INT is an internal signal.
Figure 8. Recommended Shunt Reference and RC Filter for
DAC Output
VPOA
VPOD
VCC
SEE
RECALLED VALUE
PRECHARGED
TO 0
PRECHARGED
TO 0
PRECHARGED TO 0
SEE RECALL
DS1884
REFIN
2.5V
0.1F
0201
ZTL431A
SOT23
1F
0402
CONNECT TO
CONTROL INPUT
ON DC-DC
39.2k
0201
DAC
68.1k
0201
1k
0201
20k
0201
VCC
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