17 FN7853.1 June 17, 2011 User Initiated Reset Recalibration of the A/D can be initiated at any time by driving the RESETN pin low for" />
參數(shù)資料
型號： ISLA222P20IRZ
廠商： Intersil
文件頁數(shù)： 9/33頁
文件大?。?/td> 0K
描述： IC ADC 12BIT SRL/SPI 72QFN
標(biāo)準(zhǔn)包裝： 1
系列： FemtoCharge™
位數(shù)： 12
采樣率（每秒）： 200M
數(shù)據(jù)接口： 串行，SPI?
轉(zhuǎn)換器數(shù)目： 2
功率耗散（最大）： 830mW
電壓電源： 模擬和數(shù)字
工作溫度： -40°C ~ 85°C
安裝類型： 表面貼裝
封裝/外殼： 72-VFQFN 裸露焊盤
供應(yīng)商設(shè)備封裝： 72-QFN（10x10）
包裝： 托盤
輸入數(shù)目和類型： *
ISLA222P
17
FN7853.1
June 17, 2011
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 less than 0.5mA pull-up is
recommended, as RESETN has an internal 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 ISLA222P 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 21 through 26 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.
Temperature Calibration
FIGURE 21. TYPICAL SNR PERFORMANCE vs TEMPERATURE,
DEVICE CALIBRATED AT -40°C, fIN = 105MHz
FIGURE 22. TYPICAL SFDR PERFORMANCE vs TEMPERATURE,
DEVICE CALIBRATED AT -40°C, fIN = 105MHz
FIGURE 23. TYPICAL SNR PERFORMANCE vs TEMPERATURE,
DEVICE CALIBRATED AT +25°C, fIN = 105MHz
FIGURE 24. TYPICAL SFDR PERFORMANCE vs TEMPERATURE,
DEVICE CALIBRATED AT +25°C, fIN = 105MHz
70.0
70.5
71.0
71.5
72.0
-40
-35
-30
-25
-20
-2dBFS ANALOG INPUT
-1dBFS ANALOG INPUT
TEMPERATURE (°C)
130MSPS
SN
R
(
d
B
F
S
)
200MSPS
250MSPS
75
80
85
-40
-35
-30
-25
-20
-2dBFS ANALOG INPUT
-1dBFS ANALOG INPUT
TEMPERATURE (°C)
130MSPS
200MSPS
250MSPS
SFDR
(dBc)
70.0
70.5
71.0
71.5
72.0
5
10152025
3035
40
45
-2dBFS ANALOG INPUT
-1dBFS ANALOG INPUT
TEMPERATURE (°C)
130MSPS
S
N
R
(dBFS)
200MSPS
250MSPS
75
80
85
5
101520
2530
3540
45
-2dBFS ANALOG INPUT
-1dBFS ANALOG INPUT
TEMPERATURE (°C)
130MSPS
250MSPS
200MSPS
SFDR
(
d
B
c
)
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參數(shù)描述
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