OBSOLETE

CLC410

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SNOS854D – AUGUST 2000 – REVISED APRIL 2013

During disable, supply current drops to approximately 4mA and the inverting input and output pin impedances

become 200k

Ω‖0.5pF each. The total impedance that a disabled amplifier and its associated feedback network

presents to the analog bus is determined from Figure 24. For example, at a non-inverting gain of 1, the output

impedance at video frequencies is 100k

Ω‖1pF since the 250Ω feedback resistor is a negligible impedance.

Similarly, output impedance is 500

Figure 24.

DIFFERENTIAL GAIN AND PHASE

Plots on the preceding page illustrate the differential gain and phase performance of the CLC410 at both

3.58MHz and 4.43MHz. Application Note OA-08 presents a measurement technique for measuring the very low

differential gain and phase of the CLC410. Observe that the gain and phase errors remain low even as the

output loading increases, making the device attractive for driving multiple video outputs.

UNDERSTANDING THE LOOP GAIN

The CLC410 is a current-feedback op amp. Referring to the equivalent circuit of Figure 26, any current flowing in

the inverting input is amplified to a voltage at the output through the transimpedance gain shown below. This Z(s)

is analogous to the open-loop gain of a voltage feedback amplifier.

Figure 25. Open-Loop Transimpedance Gain, Z(s)

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