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參數(shù)資料
| 型號： | LP2995MRX |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 通用總線功能 |
| 英文描述： | DDR Termination Regulator |
| 中文描述： | BUS TERMINATOR SUPPORT CIRCUIT, PDSO8 |
| 封裝： | PSOP-8 |
| 文件頁數(shù)： | 9/13頁 |
| 文件大?。?/td> | 291K |
| 代理商： | LP2995MRX |
Typical Application Circuits
The typical application circuit used for SSTL-2 termination
schemes with DDR-SDRAM can be seen in
Figure 5
.
For SSTL-3 and other applications it may be desirable to
change internal reference voltage scaling from VDDQ
*
0.5.
An external resistor in series with the VDDQ pin can be used
to lower the reference voltage. Internally two 50 k
resistors
set the output V
to be equal to VDDQ
*
0.5. The addition
of a 11.1 k
external resistor will change the internal refer-
ence voltage causing the two outputs to track VDDQ
*
0.45.
An implementation of this circuit can be seen in
Figure 6
.
Another application that is sometimes required is to increase
the V
TT
output voltage from the scaling factor of VDDQ
*
0.5.
This can be accomplished independently of V
REF
by using a
resistor divider network between V
, V
SENSE
and Ground.
An example of this circuit can be seen in
.
20039306
SSTL-2 Implementation
FIGURE 5.
20039307
SSTL-3 Implementation
FIGURE 6.
20039303
FIGURE 7.
L
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LP2995MRX/NOPB | 功能描述:低壓差穩(wěn)壓器 - LDO RoHS:否 制造商:Texas Instruments 最大輸入電壓:36 V 輸出電壓:1.4 V to 20.5 V 回動電壓（最大值）:307 mV 輸出電流:1 A 負(fù)載調(diào)節(jié):0.3 % 輸出端數(shù)量: 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-20 |
| LP2995MX | 功能描述:低壓差穩(wěn)壓器 - LDO RoHS:否 制造商:Texas Instruments 最大輸入電壓:36 V 輸出電壓:1.4 V to 20.5 V 回動電壓（最大值）:307 mV 輸出電流:1 A 負(fù)載調(diào)節(jié):0.3 % 輸出端數(shù)量: 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-20 |
| LP2995MX/J7001045 | 制造商:Rochester Electronics LLC 功能描述: 制造商:Texas Instruments 功能描述: |
| LP2995MX/NOPB | 功能描述:低壓差穩(wěn)壓器 - LDO RoHS:否 制造商:Texas Instruments 最大輸入電壓:36 V 輸出電壓:1.4 V to 20.5 V 回動電壓（最大值）:307 mV 輸出電流:1 A 負(fù)載調(diào)節(jié):0.3 % 輸出端數(shù)量: 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-20 |
| LP2995MX-NOPB | 制造商:Texas Instruments 功能描述: |
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