参数资料
| 型号： | ISLA118P50IRZ |
| 厂商： | Intersil |
| 文件页数： | 7/34页 |
| 文件大小： | 0K |
| 描述： | IC ADC 8BIT SPI/SRL 500M 72QFN |
| 产品培训模块： | Solutions for Test and Measurement Equipment |
| 标准包装： | 1 |
| 系列： | FemtoCharge™ |
| 位数： | 8 |
| 采样率（每秒）： | 500M |
| 数据接口： | 串行，SPI? |
| 转换器数目： | 2 |
| 功率耗散（最大）： | 477mW |
| 电压电源： | 模拟和数字 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 72-VFQFN 裸露焊盘 |
| 供应商设备封装： | 72-QFN（10x10） |
| 包装： | 托盘 |
| 输入数目和类型： | 2 个单端，单极；1 个差分，单极 |
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ISLA118P50
15
FN7565.2
July 25, 2011
While RESETN is low, the output clock (CLKOUTP/CLKOUTN) is
set low. Normal operation of the output clock resumes at the
next input clock edge (CLKP/CLKN) after RESETN is deasserted.
At 500MSPS the nominal calibration time is 200ms, while the
maximum calibration time is 550ms.
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, the SDO, RESETN and DNC pins must be in the
proper state for the calibration to successfully execute.
The performance of the ISLA118P50 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 less than 100mV will generally
result in an SNR change of less than 0.5dBFS and SFDR change
of less than 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 less than 0.5dBFS and an SFDR
change of less than 3dBc.
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. To achieve the performance demonstrated in the
SFDR plot, I2E must be in Track mode.
Analog Input
A single fully differential input (VINP/VINN) connects to the
sample and hold amplifier (SHA) of each unit A/D. The ideal full-
scale input voltage is 1.45V, centered at the VCM voltage of
0.535V as shown in Figure 30.
Best performance is obtained when the analog inputs are driven
differentially. The common-mode output voltage, VCM, should be
used to properly bias the inputs as shown in Figures 31 through
33. An RF transformer will give the best noise and distortion
performance for wideband and/or high intermediate frequency
FIGURE 27. CALIBRATION TIMING
CLKP
CLKN
CLKOUTP
RESETN
ORP
CALIBRATION
BEGINS
CALIBRATION
COMPLETE
CALIBRATION
TIME
FIGURE 28. SNR PERFORMANCE vs TEMPERATURE AFTER
+25°C CALIBRATION
-4
-3
-2
-1
0
1
2
3
-40
-15
10
35
60
85
SNR
CHANGE
(dBfs
)
CAL DONE AT
+85°C
TEMPERATURE (°C)
CAL DONE AT
-40°C
CAL DONE AT
+25°C
FIGURE 29. SFDR PERFORMANCE vs TEMPERATURE AFTER
+25°C CALIBRATION
-15
-10
-5
0
5
10
15
-40
-15
10
35
60
85
SF
D
R
CH
A
N
G
E
(
d
B
c)
TEMPERATURE (°C)
CAL DONE AT
-40°C
CAL DONE AT
+25°C
CAL DONE AT
+85°C
FIGURE 30. ANALOG INPUT RANGE
1.0
1.8
0.6
0.2
1.4
INP
INN
VCM
0.535V
0.725V
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