ADL5501AKSZ-R7 datasheet(22/28 Pages) AD

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ADL5501

Rev. 0 | Page 22 of 28

DRIFT OVER A REDUCED TEMPERATURE RANGE

Figure 53 shows the error over temperature for a 1.9 GHz input

signal. Error due to drift over temperature consistently remains

within ±0.25 dB and only begins to exceed this limit when the

ambient temperature goes above +25°C and below −10°C. For

all frequencies using a reduced temperature range, higher

measurement accuracy is achievable.

1.00

–1.00

–0.75

–0.50

–0.25

0.25

0.50

0.75

–25

–20

–15

–10

–5

INPUT (dBm rms)

+85°C

+70°C

+50°C

+35°C

+25°C

+15°C

0°C

–10°C

–25°C

–40°C

Figure 53. Typical Drift at 1.9 GHz for Various Temperatures

–3

–2

–1

–25

–20

–15

–10

–5

INPUT (dBm)

Figure 54. Temperature Drift Distributions for 12 Devices at −40°C, +25°C,

and +85°C vs. +25°C Linear Reference; Frequency 50 MHz; Supply 5.0 V

–3

–2

–1

–25

–20

–15

–10

–5

INPUT (dBm)

Figure 55. Output Delta from +25°C Output Voltage for 12 Devices at −40°C

and +85°C, Frequency 50 MHz, Supply 5.0 V

OPERATION BELOW 100 MHZ

The ADL5501 works at frequencies below 100 MHz, but

exhibits slightly higher linearity error. Figure 54 shows the error

distribution of 12 devices at 50 MHz over temperature. When

compared to an ideal linear transfer function at ambient, the

error of the ADL5501 over temperature remains within ±0.5 dB

for the central 20 dB of the dynamic range. At the higher input

power levels, the error grows as the response becomes nonlinear.

Due to the repeatability of the performance from part to part,

compensation can be applied to reduce the effects of temperature

drift and linearity error. To detect larger dynamic ranges at

lower frequencies, the transfer function at ambient can be

calibrated, thus eliminating the linearity error. This technique

is discussed in detail in the Calibration for Improved Accuracy

section. Figure 55 shows that the dynamic range within ±0.5 dB

error improves to 30 dB by using this method.

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