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LMP7715 Datasheet(PDF) 17 Page - Texas Instruments

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Part No. LMP7715
Description  Single and Dual Precision, 17 MHz, Low Noise, CMOS Input Amplifiers
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Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI - Texas Instruments

LMP7715 Datasheet(HTML) 17 Page - Texas Instruments

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+
RF
-
CF
IF RA < < RF
CFc = ¨
©
§
1 +
RB
RA
RA
CF
RB
CF =
CIN
GBWP
2 S RF
CCM
IIN
RF
VOUT
+
-
+
-
VB
CF
CD
VOUT
IIN
- RF
=
CIN = CD + CCM
LMP7715, LMP7716, LMP7716Q
www.ti.com
SNOSAV0E – MARCH 2006 – REVISED MARCH 2013
Figure 54. Transimpedance Amplifier
A feedback capacitance CF is usually added in parallel with RF to maintain circuit stability and to control the
frequency response. To achieve a maximally flat, 2nd order response, RF and CF should be chosen by using
Equation 3
(3)
Calculating CF from Equation 3 can sometimes result in capacitor values which are less than 2 pF. This is
especially the case for high speed applications. In these instances, it is often more practical to use the circuit
shown in Figure 55 in order to allow more sensible choices for CF. The new feedback capacitor, CF′, is (1+
RB/RA) CF. This relationship holds as long as RA << RF.
Figure 55. Modified Transimpedance Amplifier
SENSOR INTERFACE
The LMP7715/LMP7716/LMP7716Q have low input bias current and low input referred noise, which make them
ideal choices for sensor interfaces such as thermopiles, Infra Red (IR) thermometry, thermocouple amplifiers,
and pH electrode buffers.
Thermopiles generate voltage in response to receiving radiation. These voltages are often only a few microvolts.
As a result, the operational amplifier used for this application needs to have low offset voltage, low input voltage
noise, and low input bias current. Figure 56 shows a thermopile application where the sensor detects radiation
from a distance and generates a voltage that is proportional to the intensity of the radiation. The two resistors, RA
and RB, are selected to provide high gain to amplify this signal, while CF removes the high frequency noise.
Copyright © 2006–2013, Texas Instruments Incorporated
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Product Folder Links: LMP7715 LMP7716 LMP7716Q


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