LMV791MK/NOPB National Semiconductor, LMV791MK/NOPB Datasheet - Page 18

• Manufacturer Part Number: LMV791MK/NOPB
• Description: IC OP AMP CMOS 1.8V TSOT23-6
• Manufacturer: National Semiconductor
• Series: PowerWise®r

Specifications of LMV791MK/NOPB

• Amplifier Type: General Purpose
• Number Of Circuits: 1
• Output Type: Rail-to-Rail
• Slew Rate: 11.5 V/µs
• Gain Bandwidth Product: 17MHz
• Current - Input Bias: 0.1pA
• Voltage - Input Offset: 100µV
• Current - Supply: 1.15mA
• Current - Output / Channel: 60mA
• Voltage - Supply, Single/dual (±): 1.8 V ~ 5.5 V
• Operating Temperature: -40°C ~ 125°C
• Mounting Type: Surface Mount
• Package / Case: TSOT-23-6, TSOT-6
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• -3db Bandwidth: -
• Other names: LMV791MK; LMV791MKNOPB; LMV791MKNOPBTR; LMV791MKNOPBTR; LMV791MKTR

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Transimpedance, A
FIGURE 11. Frequency Response for A
FIGURE 12. Frequency Response for A
470000
470000
470000
47000
47000
47000
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TABLE 1.
100 pF 2.0 pF
200 pF 3.0 pF
100 pF 6.0 pF
200 pF 9.0 pF
50 pF 1.5 pF
50 pF 4.5 pF
C
IN
C
F
3 dB Frequency
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1.5 MHz
350 kHz
250 kHz
150 kHz
700 kHz
= 470000
1 MHz
= 47000
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HIGH GAIN WIDEBAND TRANSIMPEDANCE AMPLIFIER
USING THE LMV792
The LMV792, dual, low noise, wide bandwidth, CMOS input
op amp IC can be used for compact, robust and integrated
solutions for sensing and amplifying wide-band signals ob-
tained from sensitive photodiodes. One of the two op amps
available can be used to obtain transimpedance gain while
the other can be used for amplifying the output voltage to fur-
ther enhance the transimpedance gain. The wide bandwidth
of the op amps (17 MHz) ensures that they are capable of
providing high gain for a wide range of frequencies. The low
input referred noise (5.8 nV/
liver an output with a high SNR (signal to noise ratio). The
small MSOP-10 footprint saves space on printed circuit
boards and allows ease of design in portable products.
The circuit shown in Figure 13, has the first op amp acting as
a transimpedance amplifier with a gain of 47000, while the
second stage provides a voltage gain of 10. This provides a
total transimpedance gain of 470000 with a −3 dB bandwidth
of about 1.5 MHz, for a total input capacitance of 50 pF. The
frequency response for the circuit is shown in Figure 14
FIGURE 13. 1.5 MHz Transimpedance Amplifier, with A
FIGURE 14. 1.5 MHz Transimpedance Amplifier
Frequency Response
= 470000
) allows the amplifier to de-
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