ADL5511ACPZ-R7 datasheet(24/29 Pages) AD

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Data Sheet

ADL5511

Rev. B | Page 23 of 28

Figure 55 is a plot of this error for VENV at 1900 MHz for a

multiple devices at +25°C, +85°C, and −40°C with calibration

performed at two points, −14 dBm and +5 dBm (notice how

the error at 25°C at the calibration points is zero). These error

plots for all temperatures are calculated using the 25°C slope

and intercept. This is consistent with calibration in a mass

production environment where calibration at temperature is

generally not practical.

–3

–2

–1

–30

–25

–20

–15

–10

–5

PIN (dBm)

–40°C

+25°C

+85°C

Figure 55. VENV Linearity Error vs. Input Level and Temperature Using a

Two-Point Calibration at 1900 MHz

By adding a third calibration point, the linearity of the

ADL5511 can be enhanced at lower power levels. With

a three-point calibration, calibration coefficients (slope and

intercept) are calculated for each segment (thus, there will

be two slopes and two intercepts).

Figure 56 shows the same data as Figure 55, but with a three-

point calibration (calibration points at −26 dBm, −15 dBm, and

+5 dBm. This helps to extend the usable operating range of the

ADL5511 well below −25 dBm.

–3

–2

–1

–30

–25

–20

–15

–10

–5

PIN (dBm)

–40°C

+25°C

+85°C

Figure 56. VENV Linearity Error vs. Input Level and Temperature Using a Three-

Point Calibration at 1900 MHz

ERROR VS. FREQUENCY

Figure 57 and Figure 58 show how the VRMS and VENV output

voltages and error vary with input frequency when the

ADL5511 is calibrated at a single frequency. In this example,

the ADL5511 has been calibrated at 25°C at 1.9 GHz. The

plots also show how the output voltage and error vary above

and below this frequency.

–6

–4

–2

100

200

400

300

500

600

1000

2000

3000

4000

5000

6000

FREQUENCY (MHz)

VRMS AT –40°C

VRMS AT +25°C

VRMS AT +85°C

ERROR AT –40°C

ERROR AT +25°C

ERROR AT +85°C

Figure 57. VRMS Output vs. Frequency for a Fixed Input Power, PIN = 0 dBm,

Calibration at 1.9 GHz, 25°C

–8

–6

–4

–2

100

150

200

250

300

350

400

1000

2000

3000

4000

5000

6000

FREQUENCY (MHz)

VENV AT –40°C

VENV AT +25°C

VENV AT +85°C

ERROR AT –40°C

ERROR AT +25°C

ERROR AT +85°C

Figure 58. VENV Output vs. Frequency for a Fixed Input Power, PIN = 0 dBm,

Calibration at 1.9 GHz, 25°C

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