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| 型号： | DS1865T+T&R |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 5/67页 |
| 文件大小： | 0K |
| 描述： | IC PON CONTROL TRI 28-TQFN |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 系列： | * |
| 类型： | * |
| 应用： | * |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 28-WFQFN 裸露焊盘 |
| 供应商设备封装： | 28-TQFN-EP（5x5） |
| 包装： | 带卷 (TR) |
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DS1865
PON Triplexer Control and
Monitoring Circuit
____________________________________________________________________
13
Updates to the TXP-HI, TXP-LO, and BIAS HI quick-trip
alarms do not occur during the burst-enable low time.
Any quick-trip alarm that is detected by default remains
active until a subsequent comparator sample shows the
condition no longer exists.
A second bias-current monitor (BIAS MAX) compares
the DS1865’s BIAS DAC’s code to a digital value stored
in the MAX IBIAS register. This comparison is made
every bias-current update to ensure that a high bias
current is quickly detected.
Monitors and Fault Detection
Monitors
Monitoring functions on the DS1865 include four quick-
trip comparators and six ADC channels. This monitor-
ing, combined with the interrupt masks, determines
when/if the DS1865 shuts down its outputs and triggers
the TX-F and FETG outputs. All the monitoring levels
and interrupt masks are user programmable.
Four Quick-Trip Monitors and Alarms
Four quick-trip monitors are provided to detect potential
laser safety issues. These monitor:
1) High Bias Current (HBIAS)
2) Low Transmit Power (LTXP)
3) High Transmit Power (HTXP)
4) Max Output Current (MAX IBIAS)
The high and low transmit power quick-trip registers
(HTXP and LTXP) set the thresholds used to compare
against the BMD voltage to determine if the transmit
power is within specification. The HBIAS quick-trip com-
pares the MON1 input (generally from the MAX3643
bias monitor output) against its threshold setting to
determine if the present bias current is above specifica-
tion. The BIAS MAX quick-trip is a digital comparison
that determines if the BIAS DAC indicates that the bias
current is above specification. IBIAS is not allowed to
exceed the value set in the MAX IBIAS register. When
the DS1865 detects that the bias is at the limit, it sets the
BIAS MAX status bit and holds the bias current at the
MAX IBIAS level. The quick-trips are routed to the TX-F
and FETG outputs through interrupt masks to allow com-
binations of these alarms to be used to trigger these out-
puts. When FETG is triggered, the DS1865 also disables
the MOD and BIAS outputs. See the
BIAS and MOD
Output During Power-Up section for details.
Six ADC Monitors And Alarms
The ADC monitors six channels that measure tempera-
ture (internal temp sensor), VCC, MON1, MON2, MON3,
and MON4 using an analog multiplexer to measure
them round-robin with a single ADC. Each channel has
a customer-programmable full-scale range and offset
value that is factory programmed to a default value (see
Table 3). Additionally, MON1–MON4 can right shift
results by up to 7 bits before the results are compared
to alarm thresholds or read over the I2C bus. This
allows customers with specified ADC ranges to cali-
brate the ADC full scale to a factor of 1/2n of their spec-
ified range to measure small signals. The DS1865 can
then right shift the results by n bits to maintain the bit
weight of their specification.
LAST BURST'S
BIAS SAMPLE
BEN
BIAS DAC CODE
QUICK-TRIP
SAMPLE TIMES
HBIAS
SAMPLE
tFIRST
tREP
HTXP/LTXP
SAMPLE
BIAS
SAMPLE
BIAS
SAMPLE
BIAS
SAMPLE
BIAS
SAMPLE
BIAS
SAMPLE
BIAS
SAMPLE
BIAS
SAMPLE
Figure 3. APC and Quick-Trip Alarm Sample Timing
Table 3. ADC Default Monitor Full-Scale
Ranges
SIGNAL (UNITS)
+FS
SIGNAL
+FS
HEX
-FS
SIGNAL
-FS HEX
Temperature (
oC)
127.996
7FFF
-128
8000
VCC (V)
6.5528
FFF8
0V
0000
MON1–MON4 (V)
2.4997
FFF8
0V
0000
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相关代理商/技术参数 |
参数描述 |
|---|---|
| DS1866 | 功能描述:数字电位计 IC RoHS:否 制造商:Maxim Integrated 电阻:200 Ohms 温度系数:35 PPM / C 容差:25 % POT 数量:Dual 每 POT 分接头:256 弧刷存储器:Volatile 缓冲刷: 数字接口:Serial (3-Wire, SPI) 描述/功能:Dual Volatile Low Voltage Linear Taper Digital Potentiometer 工作电源电压:1.7 V to 5.5 V 电源电流:27 uA 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:TQFN-16 封装:Reel |
| DS1866+ | 功能描述:数字电位计 IC Log Trimmer RoHS:否 制造商:Maxim Integrated 电阻:200 Ohms 温度系数:35 PPM / C 容差:25 % POT 数量:Dual 每 POT 分接头:256 弧刷存储器:Volatile 缓冲刷: 数字接口:Serial (3-Wire, SPI) 描述/功能:Dual Volatile Low Voltage Linear Taper Digital Potentiometer 工作电源电压:1.7 V to 5.5 V 电源电流:27 uA 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:TQFN-16 封装:Reel |
| DS1866N | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Interface IC |
| DS1866S | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Interface IC |
| DS1866SN | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Interface IC |
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