16 FN7973.2 April 25, 2013 User Initiated Reset Recalibration of the ADC can be initiated at any time by driving the RESETN pin low " />
參數(shù)資料
型號： ISLA214S50IR1Z
廠商： Intersil
文件頁數(shù)： 8/41頁
文件大?。?/td> 0K
描述： IC ADC
標(biāo)準(zhǔn)包裝： 1
系列： *
ISLA214S50
16
FN7973.2
April 25, 2013
User Initiated Reset
Recalibration of the ADC 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 ISLA214S50 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 ADC 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 30 through 32 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 29. CALIBRATION TIMING
CLKP
CLKN
CALIBRATION
BEGINS
CALIBRATION
COMPLETE
CALIBRATION
TIME
RESETN
CAL_STATUS
BIT
Temperature Calibration
FIGURE 30. TYPICAL SNR AND SFDR PERFORMANCE vs
TEMPERATURE, DEVICE CALIBRATED AT -40°C,
fIN = 105MHz
FIGURE 31. TYPICAL SNR AND SFDR PERFORMANCE vs
TEMPERATURE, DEVICE CALIBRATED AT +25°C,
fIN = 105MHz
0
10
20
30
40
50
60
70
80
90
100
-40-35
-30-25
-20
TEMPERATURE (°C)
SNR
(dBF
S
)A
ND
SFDR
(d
Bc
)
SFDR AT 500MSPS
SFDR AT 350MSPS
SNR AT 500MSPS
SNR AT 350MSPS
70
72
74
76
78
80
82
84
86
88
5
1525
3545
TEMPERATURE (°C)
SNR
(
d
BFS)
AND
SFDR
(dBc)
SFDR AT 500MSPS
SFDR AT 350MSPS
SNR AT 500MSPS
SNR AT 350MSPS
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