LT6204 datasheet(16/18 Pages) LINER

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LTC6253-7

62537f

For more information www.linear.com/LTC6253-7

TYPICAL APPLICATIONS

a load of 1k. Figure 7 shows the measured CMRR across

frequency. Figure 8 shows the transient response with a

1.6VP-P output step, with the input applied to the positive

input of the instrumentation amplifier, with the negative

input grounded.

Figure 7. Instrumentation Amplifier CMRR

Figure 8. Instrumentation Amplifier Transient Response

Figure 9. Low Gain Stage with Higher Noise Gain

Figure 10. Frequency Response, Low Gain Stage

Using the LTC6253-7

Figure 11. Transient Response, Sinusoidal Input

FREQUENCY (Hz)

10k

100k

10M

100M 400M

100

62537 F07

OUTPUT

800mV/DIV

62537 F08

50ns/DIV

INPUT

20mV/DIV

Using a Gain-of-7 Stable Op Amp to Achieve Low

Closed Loop Gains

Many applications may demand higher slew rates and

bandwidths associated with decompensated op amps

like the LTC6253-7, but with lower closed loop gains. Any

circuit using the LTC6253-7 will be stable as long as the

noise gain (gain for any noise referred to the inputs of the

operational amplifier) is 7 or higher. Figure 9 shows how

such a circuit can be implemented. The overall signal gain

is 1 + RF/RG, however the noise gain is 1 + RF/(RG||RC).

Figure10showsthemeasuredfrequencyresponseofsuch

a circuit. The low frequency gain is 9.5dB (~3V/V) and is

achieved by making RF = 499Ω and RG = 249Ω. Resistor

RC is chosen to be 124Ω, leading to a noise gain of ap-

proximately 7V/V. The measured bandwidth of the circuit

is an impressive 147MHz. Figure 11 shows a 4VP-P output

at a frequency of 13MHz.

Note that for RG = ∞, RC = 82.5Ω, a closed loop gain of

+1 can be obtained, with a noise gain of 7V/V, and such a

circuit can be implemented with the LTC6253-7.

VIN

62537 F09

VOUT

VS = ±2.5V

FREQUENCY (Hz)

100k

10M

100M

–5

–3

–1

62537 F10

RL = 1k

62537 F11

20ns/DIV

2V/DIV

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