ADL5513ACPZ-R2 datasheet(18/28 Pages) AD

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ADL5513

Rev. 0 | Page 18 of 28

Compensating the device for temperature drift using TADJ allows

for great flexibility. If the user requires minimum temperature

drift at a given input power or subset of the dynamic range,

the TADJ voltage can be swept while monitoring VOUT over

temperature. Figure 36 shows how error changes on a typical

part over the full dynamic range when VTADJ is swept from 0.5 V

to 1.2 V in steps of 0.1 V.

2.4

2.2

2.0

1.8

1.6

1.4

1.2

1.0

0.8

0.6

0.4

0.2

3.0

2.5

2.0

1.5

1.0

0.5

–0.5

–1.0

–1.5

–2.0

–2.5

–3.0

–70 –65 –60 –55 –50 –45 –40 –35 –30 –25 –20 –15 –10 –5

PIN (dBm)

VTADJ = 0.5V

VTADJ = 1.2V

+25°C

+85°C

Figure 36. VOUT vs. TADJ at 85°C, 1900 MHz

Figure 37 shows the results of sweeping VTADJ over multiple

temperatures while holding PIN constant. The same VTADJ should

be used for the full dynamic range for a specified supply

operation.

DEVICE CALIBRATION

VTADJ voltages in Table 4 are chosen so that the error is at its

minimum at 85°C. Criteria for the choice of VTADJ is unique for

a given application. Figure 37 shows how error on a typical device

changes at INHI = −30 dBm when VTADJ is swept at different

temperatures. If the ADL5513 must have minimum error at a

certain temperature, then VTADJ should be chosen such that the

line for that temperature intersects the 25°C line. At this VTADJ

setting, the error at all other temperatures is not the minimum.

If the deviation of error over temperature is more important

than the error at a single temperature, VTADJ should be determined

by the intersection of the lines for the temperatures of interest.

For the characterization data presented, VTADJ values were chosen

so that ADL5513 has a minimum error at 85°C, which is at the

intersection of the lines for 85°C and 25°C. For example, at

1900 MHz, VTADJ = 0.8 V. If a given application requires error

deviation to be at a minimum when the temperature changes

from −40°C to 85°C, VTADJ is determined by the intersection of

the error line for those temperatures.

1.5

1.0

0.5

–0.5

–1.0

0.5

0.6

0.7

0.8

0.9

1.0

1.1

1.2

TADJ (V)

+25°C

0°C

+85°C

–40°C

+45°C

+105°C

–20°C

+65°C

+125°C

Figure 37. Error vs. VTADJ, PIN = −30 dBm at 1900 MHz

It is important that temperature adjustment be performed on

multiple devices.

POWER-DOWN FUNCTIONALITY

Power-down functionality of ADL5513 is achieved through exter-

nally applied voltage on the TADJ pin. If VTADJ = VPOS − 0.3 V,

the output voltage and supply current are close to 0.

1.8

1.6

1.4

1.2

1.0

0.8

0.6

0.4

0.2

4.0

4.1

4.2

4.3

4.4

4.5

4.6

4.7

4.8

4.9

5.0

TADJ (V)

+25°C

–40°C

+85°C

+125°C

Figure 38. VOUT vs. VTADJ at 100 MHz, VPOS = 5 V

100

0.1

4.0

4.1

4.2

4.3

4.4

4.5

4.6

4.7

4.8

4.9

5.0

TADJ (V)

+25°C

–40°C

+85°C

+125°C

Figure 39. Sleep Current vs. VTADJ, VPOS = 5 V

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