- 您现在的位置：买卖IC网 > PDF目录11783 > DS1875T+ (Maxim Integrated Products)IC SFP CTRLR/TRIPLEXER 38-TQFN PDF资料下载
参数资料
| 型号： | DS1875T+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 14/92页 |
| 文件大小： | 0K |
| 描述： | IC SFP CTRLR/TRIPLEXER 38-TQFN |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 90 |
| 应用： | 光纤 |
| 接口： | I²C |
| 电源电压： | 2.85 V ~ 3.9 V |
| 封装/外壳： | 38-WFQFN 裸露焊盘 |
| 供应商设备封装： | 38-TQFN（5x7） |
| 包装： | 管件 |
| 安装类型： | 表面贴装 |
| 产品目录页面： | 1431 (CN2011-ZH PDF) |
第1页第2页第3页第4页第5页第6页第7页第8页第9页第10页第11页第12页第13页当前第14页第15页第16页第17页第18页第19页第20页第21页第22页第23页第24页第25页第26页第27页第28页第29页第30页第31页第32页第33页第34页第35页第36页第37页第38页第39页第40页第41页第42页第43页第44页第45页第46页第47页第48页第49页第50页第51页第52页第53页第54页第55页第56页第57页第58页第59页第60页第61页第62页第63页第64页第65页第66页第67页第68页第69页第70页第71页第72页第73页第74页第75页第76页第77页第78页第79页第80页第81页第82页第83页第84页第85页第86页第87页第88页第89页第90页第91页第92页
DS1875
Right-Shifting ADC Result
If the weighting of the ADC digital reading must con-
form to a predetermined full-scale value defined by a
standard’s specification, then right-shifting can be used
to adjust the predetermined full-scale analog measure-
ment range while maintaining the weighting of the ADC
results. The DS1875’s range is wide enough to cover all
requirements; when the maximum input value is
≤ 1/2
the FS value, right-shifting can be used to obtain
greater accuracy. For instance, the maximum voltage
might be 1/8th the specified predetermined full-scale
value, so only 1/8th the converter’s range is used. An
alternative is to calibrate the ADC’s full-scale range to
1/8th the readable predetermined full-scale value and
use a right-shift value of 3. With this implementation, the
resolution of the measurement is increased by a factor
of 8, and because the result is digitally divided by 8 by
right-shifting, the bit weight of the measurement still
meets the standard’s specification (i.e., SFF-8472).
The right-shift operation on the ADC result is carried out
based on the contents of RIGHT SHIFT1/0 registers
(Table 02h, Registers 8Eh–8Fh). Four analog channels,
MON1–MON4, have 3 bits each allocated to set the
number of right-shifts. Up to seven right-shift operations
are allowed and are executed as a part of every con-
version before the results are compared to the high and
low alarm levels, or loaded into their corresponding
measurement registers (Table 01h, Registers
62h–6Bh). This is true during the setup of internal cali-
bration as well as during subsequent data conversions.
Transmit Fault (TX-F) Output
The TX-F output has masking registers for the ADC
alarms and the QT alarms to select which comparisons
cause it to assert. In addition, the FETG alarm is selec-
table through the TX-F mask to cause TX-F to assert. All
alarms, with the exception of FETG, only cause TX-F to
remain active while the alarm condition persists.
However, the TX-F latch bit can enable the TX-F output
to remain active until it is cleared by the TX-F reset bit,
TX-D, SOFT TX-D, or by power cycling the part. If the
FETG output is configured to trigger TX-F, it indicates
that the DS1875 is in shutdown and requires TX-D,
SOFT TX-D, or cycling power to reset. Only enabled
alarms activate TX-F (see Figure 7). Table 4 shows
TX-F as a function of TX-D and the alarm sources.
Table 4. TX-F as a Function of TX-D and
Alarm Sources
VCC > VPOA
TX-D
NONMASKED
TX-F ALARM
TX-F
No
X
1
Yes
0
Yes
0
1
Yes
1
X
0
TX-F LATCHED OPERATION
TX-F NONLATCHED OPERATION
DETECTION OF
TX-F FAULT
TX-D OR
TX-F RESET
TX-F
DETECTION OF
TX-F FAULT
TX-F
Figure 7. TX-F Timing
PON Triplexer and SFP Controller
______________________________________________________________________________________
21
相关PDF资料 |
PDF描述 |
|---|---|
| D38999/20MD18PA | CONN RCPT 18POS WALL MNT W/PINS |
| MAX7359ETG+ | IC KEY SWITCH 2WIRE 24-TQFN |
| USB-232-SS | IC USB ASYNC SRL UART 20-SSOP |
| MS27473E24F61P | CONN PLUG 61POS STRAIGHT W/PINS |
| MS27474E10F98PA | CONN RCPT 6POS JAM NUT W/PINS |
相关代理商/技术参数 |
参数描述 |
|---|---|
| DS1875T+ | 功能描述:ADC / DAC多通道 PON Triplexer & SFP Controller RoHS:否 制造商:Texas Instruments 转换速率: 分辨率:8 bit 接口类型:SPI 电压参考: 电源电压-最大:3.6 V 电源电压-最小:2 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-40 |
| DS1875T+T&R | 制造商:Maxim Integrated Products 功能描述:PON TRIPLEXER 38TQFN EP - Tape and Reel 制造商:Maxim Integrated Products 功能描述:IC SFP CTRLR/TRIPLEXER 38-TQFN 制造商:Maxim Integrated Products 功能描述:ADC / DAC Multichannel PON Triplexer & SFP Controller |
| DS1875T+T&R | 功能描述:ADC / DAC多通道 PON Triplexer & SFP Controller RoHS:否 制造商:Texas Instruments 转换速率: 分辨率:8 bit 接口类型:SPI 电压参考: 电源电压-最大:3.6 V 电源电压-最小:2 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-40 |
| DS1875T+TR | 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:PON Triplexer and SFP Controller |
| DS1876 | 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:SFP Controller with Dual LDD Interface |
发布紧急采购，3分钟左右您将得到回复。