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參數(shù)資料
| 型號： | LT1815 |
| 廠商： | Linear Technology Corporation |
| 英文描述： | 6.5mA, 220MHz, 1500V/μs,Low Power,Operational Amplifier with Programmable Current(6.5mA, 220MHz, 1500V/μs 低功耗,單路電流可編程運算放大器) |
| 中文描述： | 6.5毫安，220MHz，1500V/μs，低功耗，運算放大器，具有可編程電流（6.5毫安，220MHz，1500V/μs低功耗，單路電流可編程運算放大器） |
| 文件頁數(shù)： | 7/12頁 |
| 文件大?。?/td> | 170K |
| 代理商： | LT1815 |
7
LT1815
APPLICATIOU
W
U
U
Layout and Passive Components
As with all high speed amplifiers, the LT1815 requires
some attention to board layout. A ground plane is recom-
mended and trace lengths should be minimized, especially
on the negative input lead.
Low ESL/ESR bypass capacitors should be placed directly
at the positive and negative supply (0.01
μ
F ceramics are
recommended). For high drive current applications, addi-
tional 1
μ
F to 10
μ
F tantalums should be added.
The parallel combination of the feedback resistor and gain
setting resistor on the inverting input combine with the
input capacitance to form a pole that can cause peaking or
even oscillations. If feedback resistors greater than 1k are
used, a parallel capacitor of value,
C
F
> R
G
C
IN
/R
F
should be used to cancel the input pole and optimize
dynamic performance. For applications where the DC
noise gain is 1 and a large feedback resistor is used, C
F
should be greater than or equal to C
IN
. An example would
be an I-to-V converter.
Input Considerations
The inputs of the LT1815 amplifier are connected to the
base of an NPN and PNP bipolar transistor in parallel. The
base currents are of opposite polarity and provide first-
order bias current cancellation. Due to variation in the
matching of NPN and PNP beta, the polarity of the input
bias current can be positive or negative. The offset current,
however, does not depend on beta matching and is tightly
controlled. Therefore, the use of balanced source resis-
tance at each input is recommended for applications
where DC accuracy must be maximized. For example, with
a 100
source resistance at each input, the 800nA maxi-
mum offset current results in only 80
μ
V of extra offset,
while without balance the 8
μ
A maximum input bias cur-
rent could result in a 0.8mV offset contribution.
The inputs can withstand differential input voltages of up
to 6V without damage and without needing clamping or
series resistance for protection. This differential input
voltage generates a large internal current (up to 80mA),
which results in the high slew rate. In normal transient
closed-loop operation, this does not increase power
dissipation significantly because of the low duty cycle of
the transient inputs. Sustained differential inputs, how-
ever, will result in excessive power dissipation and there-
fore
this device should not be used as a comparator
.
Capacitive Loading
The LT1815 is stable with capacitive loads from 0pF to
100pF, which is outstanding for a 220MHz amplifier. The
internal compensation circuitry accomplishes this by sens-
ing the load induced output pole and adding compensation
at the amplifier gain node as needed. As the capacitive load
increases, both the bandwidth and phase margin de-
crease, so there will be peaking in the frequency domain
and ringing in the transient response. Coaxial cable can be
driven directly, but for best pulse fidelity, a resistor of
value equal to the characteristic impedance of the cable
(e.g. 75
) should be placed in series with the output. The
receiving end of the cable should be terminated with the
same value resistance to ground.
Slew Rate
The slew rate of the LT1815 is proportional to the differen-
tial input voltage. Therefore, highest slew rates are seen in
the lowest gain configurations. For example, a 5V output
step in a gain of 10 has a 0.5V input step, whereas in unity
gain there is a 5V input step. The LT1815 is tested for a
slew rate in a gain of –1. Lower slew rates occur in higher
gain configurations.
Programmable Current and Shutdown
(6-Lead SOT-23 Only)
The LT1815S6 has an enable pin (EN, Pin 5), which is
referenced to the negative supply and has an active low
polarity.
In order to operate the LT1815S6 at full speed (and full
supply current), pull the EN pin down to the negative
supply through an on-resistance of 75
or less.
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| LT1815CS5 | 制造商:Linear Technology 功能描述:OP Amp Single Volt Fdbk ±6.3V/12.6V 5-Pin TSOT-23 |
| LT1815CS5#PBF | 制造商:Linear Technology 功能描述:OP Amp Single Volt Fdbk ±6.3V/12.6V 5-Pin TSOT-23 |
| LT1815CS5#TR | 功能描述:IC OPAMP HI-SPEED SNGL TSOT-23-5 RoHS:否 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 標準包裝:160 系列:- 放大器類型:通用 電路數(shù):4 輸出類型:滿擺幅 轉換速率:10 V/µs 增益帶寬積:9MHz -3db帶寬:- 電流 - 輸入偏壓:1pA 電壓 - 輸入偏移:250µV 電流 - 電源:730µA 電流 - 輸出 / 通道:28mA 電壓 - 電源，單路/雙路(±):2.7 V ~ 5.5 V，±1.35 V ~ 2.75 V 工作溫度:-40°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:16-SOIC（0.154"，3.90mm 寬） 供應商設備封裝:16-SOIC N 包裝:管件 |
| LT1815CS5#TRM | 功能描述:IC OPAMP HI-SPEED SNGL TSOT-23-5 RoHS:否 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 標準包裝:160 系列:- 放大器類型:通用 電路數(shù):4 輸出類型:滿擺幅 轉換速率:10 V/µs 增益帶寬積:9MHz -3db帶寬:- 電流 - 輸入偏壓:1pA 電壓 - 輸入偏移:250µV 電流 - 電源:730µA 電流 - 輸出 / 通道:28mA 電壓 - 電源，單路/雙路(±):2.7 V ~ 5.5 V，±1.35 V ~ 2.75 V 工作溫度:-40°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:16-SOIC（0.154"，3.90mm 寬） 供應商設備封裝:16-SOIC N 包裝:管件 |
| LT1815CS5#TRMPBF | 功能描述:IC OPAMP HI-SPEED SNGL TSOT-23-5 RoHS:是 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 標準包裝:1 系列:- 放大器類型:通用 電路數(shù):4 輸出類型:滿擺幅 轉換速率:0.028 V/µs 增益帶寬積:105kHz -3db帶寬:- 電流 - 輸入偏壓:3nA 電壓 - 輸入偏移:100µV 電流 - 電源:3.3µA 電流 - 輸出 / 通道:12mA 電壓 - 電源，單路/雙路(±):2.7 V ~ 12 V，±1.35 V ~ 6 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:14-TSSOP（0.173"，4.40mm 寬） 供應商設備封裝:14-TSSOP 包裝:剪切帶 (CT) 其它名稱:OP481GRUZ-REELCT |
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