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參數(shù)資料
| 型號(hào)： | LT1792IS8 |
| 廠商： | Linear Technology |
| 文件頁(yè)數(shù)： | 11/12頁(yè) |
| 文件大小： | 0K |
| 描述： | IC OPAMP PREC JFET LONOISE 8SOIC |
| 標(biāo)準(zhǔn)包裝： | 100 |
| 放大器類型： | J-FET |
| 電路數(shù)： | 1 |
| 轉(zhuǎn)換速率： | 3.4 V/µs |
| 增益帶寬積： | 5.6MHz |
| 電流 - 輸入偏壓： | 300pA |
| 電壓 - 輸入偏移： | 200µV |
| 電流 - 電源： | 4.2mA |
| 電壓 - 電源，單路/雙路(±)： | ±4.5 V ~ 20 V |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 8-SOIC（0.154"，3.90mm 寬） |
| 供應(yīng)商設(shè)備封裝： | 8-SO |
| 包裝： | 管件 |
8
LT1792
U
S
A
O
PPLICATI
WU
U
I FOR ATIO
best bipolar op amps, with higher current noise, will
eventually lose out to the LT1792 when transducer imped-
ance increases. The low voltage noise of the LT1792
allows it to surpass most single JFET op amps available.
For the best performance versus area available anywhere,
the LT1792 is offered in the SO-8 surface mount package
with no degradation in performance.
The low voltage and current noise offered by the LT1792
makes it useful in a wide range of applications, especially
where high impedance, capacitive transducers are used
such as hydrophones, precision accelerometers and photo
diodes. The total output noise in such a system is the gain
times the RMS sum of the op amp input referred voltage
noise, the thermal noise of the transducer, and the op amp
bias current noise times the transducer impedance.
Figure 2 shows total input voltage noise versus source
resistance. In a low source resistance (<5k) application
the op amp voltage noise will dominate the total noise.
This means the LT1792 will beat out any JFET op amp, only
the lowest noise bipolar op amps have the edge
at low source resistances. As the source resistance in-
creases from 5k to 50k, the LT1792 will match the best
bipolar op amps for noise performance, since the thermal
noise of the transducer (4kTR) begins to dominate the
total noise. A further increase in source resistance, above
50k, is where the op amp’s current noise component (2qIB
RTRANS) will eventually dominate the total noise. At these
high source resistances, the LT1792 will out perform
the lowest noise bipolar op amp due to the inherently low
Figure 3. Noninverting and Inverting Gain Configurations
–
+
R2
OUTPUT
RB
CB
R1
CS
RS
CB CS
RB = RS
RS > R1 OR R2
TRANSDUCER
–
+
OUTPUT
CF
CB
RB
CB = CFCS
RB = RFRS
RF
CS
RS
TRANSDUCER
1792 F03
Q = CV;
= I = C
dQ
dt
dV
dt
SOURCE RESISTANCE (
)
100
1
10
1k
100M
1792 F02
100k
100
10M
10k
1M
RESISTOR NOISE ONLY
INPUT
NOISE
VOLTAGE
(nV/
√
H
z)
Vn = AV √Vn
2
(OP AMP) + 4kTR + 2qIB R
2
+
–
CS
RS
VO
CS
RS
LT1007
LT1792
LT1007*
LT1792*
SOURCE RESISTANCE = 2RS = R
* PLUS RESISTOR
PLUS RESISTOR
1000pF CAPACITOR
LT1792
LT1007
Figure 2. Comparison of LT1792 and LT1007 Total Output
1kHz Voltage Noise Versus Source Resistance
current noise of FET input op amps. Clearly, the LT1792
will extend the range of high impedance transducers
that can be used for high signal-to-noise ratios. This
makes the LT1792 the best choice for high impedance,
capacitive transducers.
The high input impedance JFET front end makes the
LT1792 suitable in applications where very high charge
sensitivity is required. Figure 3 illustrates the LT1792 in its
inverting and noninverting modes of operation. A charge
amplifier is shown in the inverting mode example; here the
gain depends on the principal of charge conservation at
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| LT1792IS8#PBF | 功能描述:IC OPAMP PREC JFET LONOISE 8SOIC RoHS:是 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 標(biāo)準(zhǔn)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(zhuǎn)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(yīng)商設(shè)備封裝:14-TSSOP 包裝:剪切帶 (CT) 其它名稱:OP481GRUZ-REELCT |
| LT1792IS8#TR | 功能描述:IC OPAMP PREC JFET LONOISE 8SOIC RoHS:否 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 標(biāo)準(zhǔn)包裝:100 系列:- 放大器類型:通用 電路數(shù):1 輸出類型:- 轉(zhuǎn)換速率:0.2 V/µs 增益帶寬積:- -3db帶寬:- 電流 - 輸入偏壓:100pA 電壓 - 輸入偏移:30µV 電流 - 電源:380µA 電流 - 輸出 / 通道:- 電壓 - 電源，單路/雙路(±):±2 V ~ 18 V 工作溫度:0°C ~ 70°C 安裝類型:表面貼裝 封裝/外殼:8-SOIC（0.154"，3.90mm 寬） 供應(yīng)商設(shè)備封裝:8-SO 包裝:管件 |
| LT1792IS8#TRPBF | 功能描述:IC OPAMP PREC JFET LONOISE 8SOIC RoHS:是 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 標(biāo)準(zhǔn)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(zhuǎn)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(yīng)商設(shè)備封裝:14-TSSOP 包裝:剪切帶 (CT) 其它名稱:OP481GRUZ-REELCT |
| LT1793 | 制造商:LINER 制造商全稱:Linear Technology 功能描述:Low Noise, Picoampere Bias Current, JFET Input Op Amp |
| LT1793ACN8 | 功能描述:IC OPAMP PREC JFET LOWNOISE 8DIP RoHS:否 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 標(biāo)準(zhǔn)包裝:50 系列:- 放大器類型:J-FET 電路數(shù):2 輸出類型:- 轉(zhuǎn)換速率:3.5 V/µs 增益帶寬積:1MHz -3db帶寬:- 電流 - 輸入偏壓:30pA 電壓 - 輸入偏移:2000µV 電流 - 電源:200µA 電流 - 輸出 / 通道:- 電壓 - 電源，單路/雙路(±):7 V ~ 36 V，±3.5 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 |
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