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參數(shù)資料
| 型號(hào)： | LT1793IS8#PBF |
| 廠商： | Linear Technology |
| 文件頁(yè)數(shù)： | 11/12頁(yè) |
| 文件大?。?/td> | 0K |
| 描述： | IC OPAMP PREC JFET LOWNOIS 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： | 4.2MHz |
| 電流 - 輸入偏壓： | 4pA |
| 電壓 - 輸入偏移： | 250µV |
| 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
LT1793
U
S
A
O
PPLICATI
WU
U
I FOR ATIO
voltage noise, the thermal noise of the transducer, and the
op amp’s input bias current noise times the transducer
impedance. Figure 3 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 LT1793 is superior to
most JFET op amps. Only the lowest noise bipolar op
amps have the advantage at low source resistances. As
the source resistance increases from 5k to 50k, the
LT1793 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 (2qIBR2) will eventually
dominate the total noise. At these high source resis-
tances, the LT1793 will out perform the lowest noise
bipolar op amps due to the inherently low current noise of
FET input op amps. Clearly, the LT1793 will extend the
range of high impedance transducers that can be used for
high signal-to-noise ratios. This makes the LT1793 the
best choice for high impedance, capacitive transducers.
Optimization Techniques for Charge Amplifiers
The high input impedance JFET front end makes the
LT1793 suitable in applications where very high charge
sensitivity is required. Figure 4 illustrates the LT1793 in its
inverting and noninverting modes of operation. A charge
amplifier is shown in the inverting mode example; the gain
depends on the principal of charge conservation at the
input of the LT1793. The charge across the transducer
capacitance CS is transferred to the feedback capacitor CF
with temperature will occur when the device is nulled with
a potentiometer ranging from 10k to 200k. Finer adjust-
ments can be made with resistors in series with the
potentiometer (Figure 2b).
Amplifying Signals from High Impedance Transducers
The low voltage and current noise offered by the LT1793
makes it useful in a wide range of applications, especially
where high impedance, capacitive transducers are used
such as hydrophones, precision accelerometers and
photodiodes. The total output noise in such a system is
the gain times the RMS sum of the op amp’s input referred
Figure 3. Comparison of LT1793 and LT1007 Total Output
1kHz Voltage Noise vs Source Resistance
Figure 4. Inverting and Noninverting Gain Configurations
SOURCE RESISTANCE (
)
100
1
10
1k
10k
1k
100M
1G
1793 F03
100k
100
10M
10k
1M
INPUT
NOISE
VOLTAGE
(nV/
√
H
z)
Vn = AV √Vn
2
(OP AMP) + 4kTR + 2qIBR
2
SOURCE RESISTANCE = 2RS = R
* PLUS RESISTOR
PLUS RESISTOR
1000pF CAPACITOR
RESISTOR NOISE ONLY
LT1793
LT1007*
LT1007
LT1793
LT1007
LT1793*
–
+
CS
RS
VO
–
+
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
1793 F04
Q = CV;
= I = C
dQ
dt
dV
dt
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