参数资料
| 型号： | ISLA214S50IR1Z |
| 厂商： | Intersil |
| 文件页数： | 13/41页 |
| 文件大小： | 0K |
| 描述： | IC ADC |
| 标准包装： | 1 |
| 系列： | * |
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ISLA214S50
20
FN7973.2
April 25, 2013
I2E Requirements and
Restrictions
Overview
I2E is a blind and background capable algorithm, designed to
transparently eliminate interleaving artifacts. This circuitry
eliminates interleave artifacts due to offset, gain, and sample time
mismatches between unit A/Ds, and across supply voltage and
temperature variations in real-time.
Differences in the offset, gain, and sample times of time-interleaved
A/Ds create artifacts in the digital outputs. Each of these artifacts
creates a unique signature that may be detectable in the captured
samples. The I2E algorithm optimizes performance by detecting
error signatures and adjusting each unit A/D using minimal
additional power.
I2E calibration is off by default at power-up. The I2E algorithm can
be put in Active Run state via SPI. When the I2E algorithm is in
Active Run state, it detects and corrects for offset, gain, and sample
time mismatches in real time (see Track Mode description under
“Active Run State” on page 20). However, certain analog input
characteristics can obscure the estimation of these mismatches.
The I2E algorithm is capable of detecting these obscuring analog
input characteristics, and as long as they are present I2E will stop
updating the correction in real time. Effectively, this freezes the
current correction circuitry to the last known-good state (see Hold
Mode description under “Active Run State” on page 20). Once the
analog input signal stops obscuring the interleaved artifacts, the I2E
algorithm will automatically start correcting for mismatch in real
time again.
Active Run State
During the Active Run state the I2E algorithm actively suppresses
artifacts due to interleaving based on statistics in the digitized data.
I2E has two modes of operation in this state (described in the
following), dynamically chosen in real-time by the algorithm based
on the statistics of the analog input signal.
1. Track Mode refers to the default state of the algorithm, when
all artifacts due to interleaving are actively being eliminated.
To be in Track Mode the analog input signal to the device must
adhere to the following requirements:
Possess total power greater than -20dBFS, integrated from
1MHz to Nyquist but excluding signal energy in a 100kHz band
centered at fS/4
The criteria above assumes 500MSPS operation; the frequency
bands should be scaled proportionally for lower sample rates.
Note that the effect of excluding energy in the 100kHz band
around of fS/4 exists in every Nyquist zone. This band generalizes
to the form (N*fS/4 - 50kHz) to (N*fS/4 + 50kHz), where N is any
odd integer. An input signal that violates these criteria briefly
(approximately 10s), before and after which it meets this
criteria, will not impact system performance.
The algorithm must be in Track Mode for approximately one
second (defined in I2Epost_t specification) after power-up before
the specifications apply. Once this requirement has been met,
the specifications of the device will continue to be met while I2E
remains in Track Mode, even in the presence of temperature and
supply voltage changes.
2. Hold Mode refers to the state of the I2E algorithm when the
analog input signal does not meet the requirements specified
above. If the algorithm detects that the signal no longer
meets the criteria, it automatically enters Hold Mode. In Hold
Mode, the I2E circuitry freezes the adjustment values based
on the most recent set of valid input conditions. However, in
Hold Mode, the I2E circuitry will not correct for new changes
in interleave artifacts induced by supply voltage and
temperature changes. The I2E circuitry will remain in Hold
Mode until such time as the analog input signal meets the
requirements for Track Mode.
Power Meter
The power meter calculates the average power of the analog
input, and determines if it’s within range to allow operation in
Track Mode. Both AC RMS and total RMS power are calculated,
and there are separate SPI programmable thresholds and
hysteresis values for each.
FS/4 Filter
A digital filter removes the signal energy in a 100kHz band
around fS/4 before the I2E circuitry uses these samples for
estimating offset, gain, and sample time mismatches (data
samples produced by the A/D are unaffected by this filtering).
This allows the I2E algorithm to continue in Active Run state
while in the presence of a large amount of input energy near the
fS/4 frequency. This filter can be powered down if it’s known that
the signal characteristics won’t violate the restrictions. Powering
down the FS/4 filter will reduce power consumption by
approximately 30mW.
Nyquist Zones
The I2E circuitry allows the use of any one Nyquist zone without
configuration, but requires the use of only one Nyquist zone.
Inputs that switch dynamically between Nyquist zones will cause
poor performance for the I2E circuitry. For example, I2E will
function properly for a particular application that has fS =
500MSPS and uses the 1st Nyquist zone (0MHz to 250MHz). I2E
will also function properly for an application that uses
fS = 500MSPS and the 2nd Nyquist zone (250MHz to 500MHz).
I2E will not function properly for an application that uses
fS = 500MSPS, and input frequency bands from 150MHz to
210MHz and 250MHz to 290MHz simultaneously. There is no
need to configure the I2E algorithm to use a particular Nyquist
zone, but no dynamic switching between Nyquist zones is
permitted while I2E is running. If the analog input signal switches
between multiple Nyquist zones, it may be necessary to reset I2E by
turning if off and back on (via SPI register 0x31 bit 0) to properly
calibrate in the new Nyquist zone.
Configurability and Communication
I2E can respond to status queries, be turned on and turned off,
and generally configured via SPI programmable registers.
Configuring of I2E is generally unnecessary unless the
application cannot meet the requirements of Track Mode on or
after power up. Parameters that can be adjusted and read back
include FS/4 filter threshold and status, Power Meter threshold
and status, and initial values for the offset, gain, and sample
time values to use when I2E starts.
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