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参数资料
| 型号： | LT1792AIN8 |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 运动控制电子 |
| 英文描述： | Low Noise, Precision, JFET Input Op Amp |
| 中文描述： | OP-AMP, 1000 uV OFFSET-MAX, 4.3 MHz BAND WIDTH, PDIP8 |
| 封装： | 0.300 INCH, PLASTIC, DIP-8 |
| 文件页数： | 9/12页 |
| 文件大小： | 169K |
| 代理商： | LT1792AIN8 |
9
LT1792
U
S
A
the input of the LT1792. The charge across the transducer
capacitance, C
S
, is transferred to the feedback capacitor
C
F
, resulting in a change in voltage, dV, equal to dQ/C
F
.
The gain therefore is C
F
/C
S
. For unity gain, the C
F
should
equal the transducer capacitance plus the input capaci-
tance of the LT1792 and R
F
should equal R
S
. In the
noninverting mode example, the transducer current is
converted to a change in voltage by the transducer capaci-
tance; this voltage is then buffered by the LT1792 with a
gain of 1 + R1/R2. A DC path is provided by R
S
, which is
either the transducer impedance or an external resistor.
Since R
S
is usually several orders of magnitude greater
than the parallel combination of R1 and R2, R
B
is added to
balance the DC offset caused by the noninverting input
bias current and R
S
. The input bias currents, although
small at room temperature, can create significant errors at
higher temperature, especially with transducer resistances
of up to 100M or more. The optimum value for R
S
is
determined by equating the thermal noise (4kTR
S
) to the
current noise times R
S
, [(2qI
B
) R
S
], resulting in
R
B
= 2V
T
/I
B
(V
T
= 26mV at 25
°
C). A parallel capacitor, C
B
,
is used to cancel the phase shift caused by the op amp
input capacitance and R
B
.
O
PPLICATI
U
U
Reduced Power Supply Operation
The LT1792 can be operated from
±
5V supplies for lower
power dissipation resulting in lower I
B
and noise at the
expense of reduced dynamic range. To illustrate this
benefit, let’s take the following example:
An LT1792CS8 operates at an ambient temperature of
25
°
C with
±
15V supplies, dissipating 159mW of power
(typical supply current = 5.3mA). The SO-8 package has a
θ
JA
of 190
°
C/W, which results in a die temperature in-
crease of 30.2
°
C or a room temperature die operating
temperature of 55.2
°
C. At
±
5V supplies, the die tempera-
ture increases by only one third of the previous amount or
10.1
°
C resulting in a typical die operating temperature of
only 35.1
°
C. A 20 degree reduction of die temperature is
achieved at the expense of a 20V reduction in dynamic
range.
To take full advantage of a wide input common mode
range, the LT1792 was designed to eliminate phase rever-
sal. Referring to the photographs shown in Figure 4, the
LT1792 is shown operating in the follower mode (A
V
= 1)
at
±
5V supplies with the input swinging
±
5.2V. The output
of the LT1792 clips cleanly and recovers with no phase
reversal. This has the benefit of preventing lock-up in
servo systems and minimizing distortion components.
High Speed Operation
The low noise performance of the LT1792 was achieved
by making the input JFET differential pair large to maxi-
mize the first stage gain. Increasing the JFET geometry
INPUT:
±
5.2V Sine Wave
LT1792 Output
1792 F04a
1792 F03b
Figure 4. Voltage Follower with Input Exceeding the Common Mode Range ( V
S
=
±
5V)
相关PDF资料 |
PDF描述 |
|---|---|
| LT1792 | Low Noise, Precision, JFET Input Op Amp |
| LT1792ACN8 | Low Noise, Precision, JFET Input Op Amp |
| LT1792ACS8 | Low Noise, Precision, JFET Input Op Amp |
| LT1792CN8 | Low Noise, Precision, JFET Input Op Amp |
| LT1792CS8 | Low Noise, Precision, JFET Input Op Amp |
相关代理商/技术参数 |
参数描述 |
|---|---|
| LT1792AIN8#PBF | 功能描述:IC OPAMP PREC JFET LOWNOISE 8DIP RoHS:是 类别:集成电路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 标准包装:2,500 系列:- 放大器类型:通用 电路数:1 输出类型:满摆幅 转换速率:0.11 V/µs 增益带宽积:350kHz -3db带宽:- 电流 - 输入偏压:4nA 电压 - 输入偏移:20µV 电流 - 电源:260µA 电流 - 输出 / 通道:20mA 电压 - 电源，单路/双路(±):2.7 V ~ 36 V，±1.35 V ~ 18 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:8-SOIC（0.154"，3.90mm 宽） 供应商设备封装:8-SO 包装:带卷 (TR) |
| LT1792AIS8 | 功能描述:IC OPAMP PREC JFET LONOISE 8SOIC RoHS:否 类别:集成电路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 标准包装:50 系列:- 放大器类型:J-FET 电路数:2 输出类型:- 转换速率:13 V/µs 增益带宽积:3MHz -3db带宽:- 电流 - 输入偏压:65pA 电压 - 输入偏移:3000µV 电流 - 电源:1.4mA 电流 - 输出 / 通道:- 电压 - 电源，单路/双路(±):7 V ~ 36 V，±3.5 V ~ 18 V 工作温度:-40°C ~ 85°C 安装类型:通孔 封装/外壳:8-DIP（0.300"，7.62mm） 供应商设备封装:8-PDIP 包装:管件 |
| LT1792AIS8#PBF | 功能描述:IC OPAMP PREC JFET LONOISE 8SOIC RoHS:是 类别:集成电路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 标准包装:50 系列:- 放大器类型:J-FET 电路数:2 输出类型:- 转换速率:13 V/µs 增益带宽积:3MHz -3db带宽:- 电流 - 输入偏压:65pA 电压 - 输入偏移:3000µV 电流 - 电源:1.4mA 电流 - 输出 / 通道:- 电压 - 电源，单路/双路(±):7 V ~ 36 V，±3.5 V ~ 18 V 工作温度:-40°C ~ 85°C 安装类型:通孔 封装/外壳:8-DIP（0.300"，7.62mm） 供应商设备封装:8-PDIP 包装:管件 |
| LT1792AIS8#TR | 功能描述:IC OPAMP PREC JFET LONOISE 8SOIC RoHS:否 类别:集成电路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 标准包装:50 系列:- 放大器类型:J-FET 电路数:2 输出类型:- 转换速率:13 V/µs 增益带宽积:3MHz -3db带宽:- 电流 - 输入偏压:65pA 电压 - 输入偏移:3000µV 电流 - 电源:1.4mA 电流 - 输出 / 通道:- 电压 - 电源，单路/双路(±):7 V ~ 36 V，±3.5 V ~ 18 V 工作温度:-40°C ~ 85°C 安装类型:通孔 封装/外壳:8-DIP（0.300"，7.62mm） 供应商设备封装:8-PDIP 包装:管件 |
| LT1792AIS8#TRPBF | 功能描述:IC OPAMP PREC JFET LONOISE 8SOIC RoHS:是 类别:集成电路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 标准包装:50 系列:- 放大器类型:J-FET 电路数:2 输出类型:- 转换速率:13 V/µs 增益带宽积:3MHz -3db带宽:- 电流 - 输入偏压:65pA 电压 - 输入偏移:3000µV 电流 - 电源:1.4mA 电流 - 输出 / 通道:- 电压 - 电源，单路/双路(±):7 V ~ 36 V，±3.5 V ~ 18 V 工作温度:-40°C ~ 85°C 安装类型:通孔 封装/外壳:8-DIP（0.300"，7.62mm） 供应商设备封装:8-PDIP 包装:管件 |
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