KMB-001LEVALZ datasheet(16/33 Pages) RENESAS

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ISLA224P12

FN7983 Rev.4.01

Page 16 of 32

Apr 8, 2024

User Initiated Reset

Recalibration of the A/D can be initiated at any time by driving

the RESETN pin low for a minimum of one clock cycle. An

open-drain driver with a drive strength in its high impedance

state of less than 0.5mA is recommended, as RESETN has an

internal high impedance pull-up to OVDD. As is the case during

power-on reset, RESETN and DNC pins must be in the proper

state for the calibration to successfully execute.

The performance of the ISLA224P12 changes with variations in

temperature, supply voltage or sample rate. The extent of these

changes may necessitate recalibration, depending on system

performance requirements. Best performance will be achieved

by recalibrating the A/D under the environmental conditions at

which it will operate.

A supply voltage variation of <100mV will generally result in an

SNR change of <0.5dBFS and SFDR change of <3dBc.

In situations where the sample rate is not constant, best results

will be obtained if the device is calibrated at the highest sample

rate. Reducing the sample rate by less than 80MSPS will typically

result in an SNR change of <0.5dBFS and an SFDR change of

<3dBc.

Figures 23 through 28 show the effect of temperature on SNR

and SFDR performance with power on calibration performed at

-40°C, +25°C, and +85°C. Each plot shows the variation of

SNR/SFDR across temperature after a single power on

calibration at -40°C, +25°C and +85°C. Best performance is

typically achieved by a user-initiated power on calibration at the

operating conditions, as stated earlier. However, it can be seen

that performance drift with temperature is not a very strong

function of the temperature at which the power on calibration is

performed.

FIGURE 22. CALIBRATION TIMING

CLKP

CLKN

CLKOUTP

CALIBRATION

BEGINS

CALIBRATION

COMPLETE

CALIBRATION

TIME

RESETN

CAL_STATUS

BIT

Temperature Calibration

FIGURE 23. TYPICAL SNR PERFORMANCE vs TEMPERATURE,

DEVICE CALIBRATED AT -40°C, fIN = 105MHz

FIGURE 24. TYPICAL SFDR PERFORMANCE vs TEMPERATURE,

DEVICE CALIBRATED AT -40°C, fIN = 105MHz

FIGURE 25. TYPICAL SNR PERFORMANCE vs TEMPERATURE,

DEVICE CALIBRATED AT +25°C, fIN = 105MHz

FIGURE 26. TYPICAL SFDR PERFORMANCE vs TEMPERATURE,

DEVICE CALIBRATED AT +25°C, fIN = 105MHz

73.50

73.75

74.00

74.25

74.50

74.75

75.00

-40

-35

-30

-25

-20

TEMPERATURE (°C)

-2dBFS ANALOG INPUT

-1dBFS ANALOG INPUT

-40

-35

-30

-25

-20

-2dBFS ANALOG INPUT

-1dBFS ANALOG INPUT

TEMPERATURE (°C)

73.50

73.75

74.00

74.25

74.50

74.75

75.00

1015

2025

3035

TEMPERATURE (°C)

-2dBFS ANALOG INPUT

-1dBFS ANALOG INPUT

152025

3540

-2dBFS ANALOG INPUT

-1dBFS ANALOG INPUT

TEMPERATURE (°C)

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