參數(shù)資料
型號(hào)： LTC2208UP
廠商： Linear Technology Corporation
英文描述： 16-Bit, 130Msps ADC
中文描述： 16位，130Msps ADC
文件頁(yè)數(shù)： 24/32頁(yè)
文件大小： 1222K
代理商： LTC2208UP
LTC2208
24
2208fa
Overflow Bit
An overflow output bit (OF) indicates when the converter
is over-ranged or under-ranged. In CMOS mode, a logic
high on the OFA pin indicates an overflow or underflow on
the A data bus, while a logic high on the OFB pin indicates
an overflow on the B data bus. In LVDS mode, a differ-
ential logic high on OF
+
/OF
–
pins indicates an overflow
or underflow.
Output Clock
The ADC has a delayed version of the encode input avail-
able as a digital output, CLKOUT. The CLKOUT pin can
be used to synchronize the converter data to the digital
system. This is necessary when using a sinusoidal en-
code. In both CMOS modes, A bus data will be updated
as CLKOUTA falls and CLKOUTB rises. In demultiplexed
CMOS mode the B bus data will be updated as CLKOUTA
falls and CLKOUTB rises.
In Full Rate CMOS Mode, only the A data bus is active;
data may be latched on the rising edge of CLKOUTA or
the falling edge of CLKOUTB.
In demultiplexed CMOS mode CLKOUTA and CLKOUTB
will toggle at 1/2 the frequency of the encode signal. Both
the A bus and the B bus may be latched on the rising edge
of CLKOUTA or the falling edge of CLKOUTB.
Digital Output Randomizer
Interference from the ADC digital outputs is sometimes
unavoidable. Interference from the digital outputs may be
from capacitive or inductive coupling or coupling through
the ground plane. Even a tiny coupling factor can result in
discernible unwanted tones in the ADC output spectrum.
By randomizing the digital output before it is transmitted
off chip, these unwanted tones can be randomized, trading
a slight increase in the noise floor for a large reduction in
unwanted tone amplitude.
The digital output is “Randomized” by applying an exclu-
sive-OR logic operation between the LSB and all other data
output bits. To decode, the reverse operation is applied;
that is, an exclusive-OR operation is applied between the
LSB and all other bits. The LSB, OF and CLKOUT output
are not affected. The output Randomizer function is active
when the RAND pin is high.
APPLICATIU
W
U
U
Output Driver Power
Separate output power and ground pins allow the output
drivers to be isolated from the analog circuitry. The power
supply for the digital output buffers, OV
DD
, should be tied
to the same power supply as for the logic being driven.
For example, if the converter is driving a DSP powered
by a 1.8V supply, then OV
DD
should be tied to that same
1.8V supply. In CMOS mode OV
DD
can be powered with
any logic voltage up to the 3.6V. OGND can be powered
with any voltage from ground up to 1V and must be less
than OV
DD
. The logic outputs will swing between OGND
and OV
DD
. In LVDS Mode, OV
DD
should be connected to
a 3.3V supply and OGND should be connected to GND.
Figure 13. Functional Equivalent of Digital Output Randomizer
CLKOUT
OF
D15/D0
D14/D0
D2/D0
D1/D0
D0
D0
D1
RAND = HIGH,
SCRAMBLE
ENABLED
D2
D14
D15
OF
CLKOUT
RAND
2208 F13
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