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參數(shù)資料
| 型號： | LT1228CN8 |
| 廠商： | Linear Technology |
| 文件頁數(shù)： | 3/22頁 |
| 文件大小： | 0K |
| 描述： | IC CURRNT FEEDBCK AMP100MHZ 8DIP |
| 標(biāo)準(zhǔn)包裝： | 50 |
| 放大器類型： | 電流反饋 |
| 電路數(shù)： | 1 |
| 轉(zhuǎn)換速率： | 3500 V/µs |
| -3db帶寬： | 100MHz |
| 電流 - 輸入偏壓： | 10µA |
| 電壓 - 輸入偏移： | 3000µV |
| 電流 - 電源： | 6mA |
| 電流 - 輸出 / 通道： | 125mA |
| 電壓 - 電源，單路/雙路(±)： | 4 V ~ 36 V，±2 V ~ 18 V |
| 工作溫度： | 0°C ~ 70°C |
| 安裝類型： | 通孔 |
| 封裝/外殼： | 8-DIP（0.300"，7.62mm） |
| 供應(yīng)商設(shè)備封裝： | 8-PDIP |
| 包裝： | 管件 |
LT1228
11
1228fd
APPLICATIONS INFORMATION
compliance compatible with Pin 5 of the LT1228. There-
fore, the easiest way to digitally control the set current
is to use a voltage output DAC and a voltage-to-current
circuit. The previous voltage-to-current converter will take
the output of any voltage output DAC and drive Pin 5 with
a proportional current. The R, 2R CMOS multiplying DACs
operating in the voltage switching mode work well on both
single and split supplies with the above circuit.
Logarithmic control is often easier to use than linear
control. A simple circuit that doubles the set current
for each additional volt of input is shown in the voltage
controlled state variable filter application near the end of
this data sheet.
Transconductance Amplifier Frequency Response
The bandwidth of the transconductance amplifier is a
function of the set current as shown in the characteristic
curves. At set currents below 100A, the bandwidth is
approximately:
–3dB bandwidth = 3 1011 ISET
The peak bandwidth is about 80MHz at 500A. When a
resistor is used to convert the output current to a volt-
age, the capacitance at the output forms a pole with the
resistor. The best case output capacitance is about 5pF
with ±15V supplies and 6pF with ±5V supplies. You must
add any PC board or socket capacitance to these values to
get the total output capacitance. When using a 1k resistor
at the output of the transconductance amp, the output
capacitance limits the bandwidth to about 25MHz.
The output slew rate of the transconductance amplifier is
the set current divided by the output capacitance, which
is 6pF plus board and socket capacitance. For example
with the set current at 1mA, the slew rate would be over
100V/s.
Transconductance Amp Small-Signal Response
ISET = 500A, R1 = 50
CURRENT FEEDBACK AMPLIFIER
The LT1228 current feedback amplifier has very high
noninvertinginputimpedanceandisthereforeanexcellent
buffer for the output of the transconductance amplifier.
The noninverting input is at Pin 1, the inverting input at
Pin 8 and the output at Pin 6. The current feedback ampli-
fier maintains its wide bandwidth for almost all voltage
gains making it easy to interface the output levels of the
transconductance amplifier to other circuitry. The cur-
rent feedback amplifier is designed to drive low imped-
ance loads such as cables with excellent linearity at high
frequencies.
Feedback Resistor Selection
Thesmall-signalbandwidthoftheLT1228currentfeedback
amplifier is set by the external feedback resistors and the
internal junction capacitors. As a result, the bandwidth is
a function of the supply voltage, the value of the feedback
resistor, the closed-loop gain and load resistor. The char-
acteristic curves of bandwidth versus supply voltage are
done with a heavy load (100) and a light load (1k) to
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| LT1228CN8#PBF | 功能描述:IC CURRNT FEEDBCK AMP100MHZ 8DIP RoHS:是 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 標(biāo)準(zhǔn)包裝:73 系列:Over-The-Top® 放大器類型:通用 電路數(shù):4 輸出類型:滿擺幅 轉(zhuǎn)換速率:0.07 V/µs 增益帶寬積:200kHz -3db帶寬:- 電流 - 輸入偏壓:1nA 電壓 - 輸入偏移:285µV 電流 - 電源:50µA 電流 - 輸出 / 通道:25mA 電壓 - 電源，單路/雙路(±):2 V ~ 44 V，±1 V ~ 22 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:16-WFDFN 裸露焊盤 供應(yīng)商設(shè)備封裝:16-DFN-EP（5x3） 包裝:管件 |
| LT1228CN8PBF | 制造商:Linear Technology 功能描述:LT1228CN8PBF |
| LT1228CS8 | 功能描述:IC CURRNT FEEDBK AMP 100MHZ8SOIC RoHS:否 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 標(biāo)準(zhǔn)包裝:73 系列:Over-The-Top® 放大器類型:通用 電路數(shù):4 輸出類型:滿擺幅 轉(zhuǎn)換速率:0.07 V/µs 增益帶寬積:200kHz -3db帶寬:- 電流 - 輸入偏壓:1nA 電壓 - 輸入偏移:285µV 電流 - 電源:50µA 電流 - 輸出 / 通道:25mA 電壓 - 電源，單路/雙路(±):2 V ~ 44 V，±1 V ~ 22 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:16-WFDFN 裸露焊盤 供應(yīng)商設(shè)備封裝:16-DFN-EP（5x3） 包裝:管件 |
| LT1228CS8#PBF | 功能描述:IC CURRNT FEEDBK AMP 100MHZ8SOIC RoHS:是 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 標(biāo)準(zhǔn)包裝:2,500 系列:- 放大器類型:通用 電路數(shù):4 輸出類型:- 轉(zhuǎn)換速率:0.6 V/µs 增益帶寬積:1MHz -3db帶寬:- 電流 - 輸入偏壓:45nA 電壓 - 輸入偏移:2000µV 電流 - 電源:1.4mA 電流 - 輸出 / 通道:40mA 電壓 - 電源，單路/雙路(±):3 V ~ 32 V，±1.5 V ~ 16 V 工作溫度:0°C ~ 70°C 安裝類型:表面貼裝 封裝/外殼:14-TSSOP（0.173"，4.40mm 寬） 供應(yīng)商設(shè)備封裝:14-TSSOP 包裝:帶卷 (TR) 其它名稱:LM324ADTBR2G-NDLM324ADTBR2GOSTR |
| LT1228CS8#TR | 功能描述:IC AMP CURR FEEDBCK 100MHZ 8SOIC RoHS:否 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 標(biāo)準(zhǔn)包裝:73 系列:Over-The-Top® 放大器類型:通用 電路數(shù):4 輸出類型:滿擺幅 轉(zhuǎn)換速率:0.07 V/µs 增益帶寬積:200kHz -3db帶寬:- 電流 - 輸入偏壓:1nA 電壓 - 輸入偏移:285µV 電流 - 電源:50µA 電流 - 輸出 / 通道:25mA 電壓 - 電源，單路/雙路(±):2 V ~ 44 V，±1 V ~ 22 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:16-WFDFN 裸露焊盤 供應(yīng)商設(shè)備封裝:16-DFN-EP（5x3） 包裝:管件 |
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