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ADC12DJ2700 Datasheet(PDF) 48 Page - Texas Instruments

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Part No. ADC12DJ2700
Description  5.4-GSPS Single-Channel or 2.7-GSPS Dual-Channel, 12-Bit, RF-Sampling Analog-to-Digital Converter (ADC)
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

ADC12DJ2700 Datasheet(HTML) 48 Page - Texas Instruments

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(
)
26
FREQAx
round 2
N / NCO_RDIV
=
´
(NCO)
(STEP)
¦
N
¦
(
)
32
NCO
DEVCLK
FREQAx
/
round 2
=
´ ¦
¦
(
)
DEVCLK
STEP
/
NCO _ RDIV
64
¦
¦
=
48
ADC12DJ2700
SLVSEH9 – JANUARY 2018
www.ti.com
Product Folder Links: ADC12DJ2700
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Copyright © 2018, Texas Instruments Incorporated
The frequency for each phase accumulator is programmed independently through the FREQAx, FREQBx (x = 0
to 3) and, optionally, NCO_RDIV register settings. The phase offset for each accumulator is programmed
independently through the PHASEAx and PHASEBx (x = 0 to 3) register settings.
7.3.6.1.3
Basic NCO Frequency Setting Mode
In basic NCO frequency-setting mode (NCO_RDIV = 0x0000), the NCO frequency setting is set by the 32-bit
register value, FREQAx and FREQBx (x = 0 to 3). The NCO frequency for DDC A can be calculated using
Equation 4, where FREQAx can be replaced by FREQBx to calculate the NCO frequency for DDC B.
ƒ(NCO) = FREQAx × 2
–32 × ƒ
(DEVCLK) (x = 0 – 3)
(4)
NOTE
Changing the FREQAx and FREQBx register settings during operation results in a non-
deterministic NCO phase. If deterministic phase is required, the NCOs must be
resynchronized; see the NCO Phase Synchronization section.
7.3.6.1.4
Rational NCO Frequency Setting Mode
In basic NCO frequency mode, the frequency step size is very small and many frequencies can be synthesized,
but sometimes an application requires very specific frequencies that fall between two frequency steps. For
example with ƒS equal to 2457.6 MHz and a desired ƒ(NCO) equal to 5.02 MHz, the value for FREQAx is
8773085.867. Truncating the fractional portion results in an ƒ(NCO) equal to 5.0199995 MHz, which is not the
desired frequency.
To produce the desired frequency, the NCO_RDIV parameter is used to force the phase accumulator to arrive at
specific frequencies without error. First, select a frequency step size (ƒ(STEP)) that is appropriate for the NCO
frequency steps required. The typical value of ƒ(STEP) is 10 kHz. Next, use Equation 5 to program the NCO_RDIV
value.
(5)
The result of Equation 5 must be an integer value. If the value is not an integer, adjust either of the parameters
until the result is an integer value.
For example, select a value of 1920 for NCO_RDIV.
NOTE
NCO_RDIV values larger than 8192 can degrade the NCO SFDR performance and are
not recommended.
Now use Equation 6 to calculate the FREQAx register value.
(6)
Alternatively, the following equations can be used:
(7)
(8)


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