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參數(shù)資料
| 型號： | LT1215 |
| 廠商： | Linear Technology Corporation |
| 英文描述： | 23MHz, 50V/ms, Single Supply Dual Precision Op Amps(23MHz, 50V/ms,單電源，雙路精密運(yùn)算放大器) |
| 中文描述： | 23MHz，50V/ms，單電源雙精度運(yùn)算放大器（23MHz，50V/ms，單電源，雙路精密運(yùn)算放大器） |
| 文件頁數(shù)： | 13/20頁 |
| 文件大小： | 368K |
| 代理商： | LT1215 |
13
LT1215/LT1216
U
S
A
Supply Voltage
The LT1215/LT1216 op amps are fully functional and all
internal bias circuits are in regulation with 2.2V of supply.
The amplifiers will continue to function with as little as
1.5V, although the input common mode range and the
phase margin are about gone. The minimum operating
supply voltage is guaranteed by the PSRR tests which are
done with the input common mode equal to 500mV and a
minimum supply voltage of 2.5V. The LT1215/LT1216 are
guaranteed over the full –55
°
C to 125
°
C range with a
minimum supply voltage of 2.7V.
The positive supply pin of the LT1215/LT1216 should be
bypassed with a small capacitor (about 0.01
μ
F) within an
inch of the pin. When driving heavy loads and for good
settling time, an additional 4.7
μ
F capacitor should be
used. When using split supplies, the same is true for the
negative supply pin.
O
PPLICATI
U
U
Power Dissipation
The LT1215/LT1216 amplifiers combine high speed and
large output current drive into very small packages. Be-
cause these amplifiers work over a very wide supply range,
it is possible to exceed the maximum junction temperature
under certain conditions. To insure that the LT1215/
LT1216 are used properly, calculate the worst case power
dissipation, define the maximum ambient temperature,
select the appropriate package and then calculate the
maximum junction temperature.
The worst case amplifier power dissipation is the total of
the quiescent current times the total power supply voltage
plus the power in the IC due to the load. The quiescent
supply current of the LT1215/LT1216 has a positive tem-
perature coefficient. The maximum supply current of each
amplifier at 125
°
C is given by the following formula:
I
SMAX
= 8.4 + 0.076 (V
S
– 5) in mA
V
S
is the total supply voltage.
The power in the IC due to the load is a function of the
output voltage, the supply voltage and load resistance. The
worst case occurs when the output voltage is at half
supply, if it can go that far, or its maximum value if it
cannot reach half supply.
For example, calculate the worst case power dissipation
while operating on
±
15V supplies and driving a 500
load.
I
SMAX
= 8.4 + 0.076 (30 – 5) = 10.3mA
P
DMAX
= 2 V
S
I
SMAX
+ (V
S
– V
OMAX
) V
OMAX
/R
L
P
DMAX
= 2 15V
10.3mA + (15V – 7.5V) 7.5V/500
= 0.309 + 0.113 = 0.422 Watt per Amp
If this is the dual LT1215, the total power in the package is
twice that, or 0.844W. Now calculate how much the die
temperature will rise above the ambient. The total power
dissipation times the thermal resistance of the package
gives the amount of temperature rise. For this example, in
the SO-8 surface mount package, the thermal resistance is
150
°
C/W junction-to-ambient in still air.
Temperature Rise = P
DMAX
θ
JA
= 0.844W 150
°
C/W
= 126.6
°
C
The maximum junction temperature allowed in the plastic
package is 150
°
C. Therefore the maximum ambient al-
lowed is the maximum junction temperature less the
temperature rise.
Maximum Ambient = 150
°
C – 126.6
°
C = 23.4
°
C
That means the SO-8 dual can only be operated at or below
room temperature on
±
15V supplies with a 500
load.
Obviously this is not recommended. Lowering the supply
voltage is recommended, or use the DIP packaged part.
As a guideline to help in the selection of the LT1215/
LT1216, the following table describes the maximum sup-
ply voltage that can be used with each part based on the
following assumptions:
1. The maximum ambient is 70
°
C or 125
°
C depending
on the part rating.
2. The load is 500
, includes the feedback resistors.
3. The output can be anywhere between the supplies.
PART
LT1215MJ8
LT1215CN8
LT1215CS8
LT1216CN
LT1216CS
MAX SUPPLIES
15.0V or
±
10.3V
20.3V or
±
14.5V
15.7V or
±
10.8V
16.4V or
±
11.4V
13.0V or
±
8.7V
MAX POWER AT MAX T
A
500mW
800mW
533mW
1143mW
800mW
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| LT1216 | 23MHz, 50V/ms,Single Supply Quad Precision Op Amps(23MHz, 50V/ms,單電源，四路精密運(yùn)算放大器) |
| LT1222 | 8-Bit Universal Shift/Storage Registers With Synchronous Clear And 3-State Outputs 20-PDIP 0 to 70 |
| LT1222C | 500MHz Operational Amplifier |
| LT1222CN8 | 500MHz Operational Amplifier |
| LT1222CS8 | 500MHz Operational Amplifier |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LT1215-15E | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:2:1 or 4:1 Wide input, Triple Outputs |
| LT1215ACN8 | 功能描述:IC PREC OP-AMP 23MHZ DUAL 8-DIP RoHS:否 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 標(biāo)準(zhǔn)包裝:150 系列:- 放大器類型:音頻 電路數(shù):2 輸出類型:- 轉(zhuǎn)換速率:5 V/µs 增益帶寬積:12MHz -3db帶寬:- 電流 - 輸入偏壓:100nA 電壓 - 輸入偏移:500µV 電流 - 電源:6mA 電流 - 輸出 / 通道:50mA 電壓 - 電源，單路/雙路(±):4 V ~ 32 V，±2 V ~ 16 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:8-TSSOP（0.173"，4.40mm 寬） 供應(yīng)商設(shè)備封裝:8-TSSOP 包裝:管件 |
| LT1215ACN8#PBF | 功能描述:IC PREC OP-AMP 23MHZ DUAL 8-DIP RoHS:是 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 標(biāo)準(zhǔn)包裝:150 系列:- 放大器類型:音頻 電路數(shù):2 輸出類型:- 轉(zhuǎn)換速率:5 V/µs 增益帶寬積:12MHz -3db帶寬:- 電流 - 輸入偏壓:100nA 電壓 - 輸入偏移:500µV 電流 - 電源:6mA 電流 - 輸出 / 通道:50mA 電壓 - 電源，單路/雙路(±):4 V ~ 32 V，±2 V ~ 16 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:8-TSSOP（0.173"，4.40mm 寬） 供應(yīng)商設(shè)備封裝:8-TSSOP 包裝:管件 |
| LT1215AMJ8 | 制造商:LINER 制造商全稱:Linear Technology 功能描述:23MHz, 50V/us, Single Supply Dual and Quad Precision Op Amps |
| LT1215C | 制造商:LINER 制造商全稱:Linear Technology 功能描述:23MHz, 50V/us, Single Supply Dual and Quad Precision Op Amps |
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