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LT5554

5554f

Gain Step Accuracy

LT5554 internal input signal coupling to the transcon-

ductance ampliﬁer inputs across the 4dB step attenuator

increases with frequency. The gain step error is higher

when the LT5554 gain update changes the input attenua-

tor tap (PG5, PG6 transitions) and this error is frequency

dependent.

Gain error is ‘compressive’, effectively reducing LT5554

gain range. Therefore, it is possible to skip one gain

APPLICATIONS INFORMATION

code whenever PG5, PG6 transitions are involved in or-

der to preserve high-frequency monotonic behavior for

0.125dB steps.

Linearity and Noise Performance Throughout the

Gain Range

The LT5554’s Noise and Linearity performance across

the 16dB gain range at 100MHz with ROUT = 100 and

RSADC = 50Ω is shown in Figures 10 through 13.

ATTENUATION (dB)

–4

–8

–12

5554 F10

–16

RTI

VONOISE

Figure 10. Noise, 140MHz, ROUT = 50Ω

ATTENUATION (dB)

–4

–8

–12

5554 F12

–16

IMD3

–70

–74

–78

–82

–86

OIP3

Figure 12. Linearity, 70MHz, ROUT = 50Ω, 4dBm/Tone

ATTENUATION (dB)

–4

–8

–12

5554 F11

–16

136

132

128

124

120

SFDR

IIP3

Figure 11. Noise, 140MHz, ROUT = 50Ω

ATTENUATION (dB)

–4

–8

–12

5554 F12

–16

IMD3

–70

–74

–78

–82

–86

OIP3

Figure 13. Linearity, 140MHz, ROUT = 50Ω, 4dBm/Tone

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