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ADC12DJ2700 Datasheet(PDF) 46 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) 46 Page - Texas Instruments

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NCO Bank A
Complex
Mixer
N
MUX
NCOA[1:0] or
CSELA[1:0]
2
Decimate-by-N
(based on JMODE)
Spectral
Inversion
2
High Pass
Low Pass
Real
12-bit
@ Fs
Complex
15-bit
@ Fs/N
2
Real
15-bit
@ Fs/2
DIG_BIND_A
D2_HIGH_PASS
INVERT_SPECTRUM
JMODE
(DDC Bypass)
JMODE
ADC
Channel A
ADC
Channel B
JESD204B
Copyright © 2017, Texas Instruments Incorporated
46
ADC12DJ2700
SLVSEH9 – JANUARY 2018
www.ti.com
Product Folder Links: ADC12DJ2700
Submit Documentation Feedback
Copyright © 2018, Texas Instruments Incorporated
Figure 67. Channel A Digital Down Conversion Block (Dual-Channel Mode Only)
7.3.6.1 Numerically-Controlled Oscillator and Complex Mixer
The DDC contains a complex numerically-controlled oscillator (NCO) and a complex mixer. Equation 3 shows the
complex exponential sequence generated by the oscillator.
x[n] = e
jωn
(3)
The frequency (ω) is specified by a 32-bit register setting. The complex exponential sequence is multiplied by the
real input from the ADC to mix the desired carrier to a frequency equal to fIN + fNCO, where fIN is the analog input
frequency after aliasing (in undersampling systems) and fNCO is the programmed NCO frequency.
7.3.6.1.1
NCO Fast Frequency Hopping (FFH)
Fast frequency hopping (FFH) is made possible by each DDC having four independent NCOs that can be
controlled by the NCOA0 and NCOA1 pins for DDC A and the NCOB0 and NCOB1 pins for DDC B. Each NCO
has independent frequency settings (see the Basic NCO Frequency Setting Mode section) and initial phase
settings (see the NCO Phase Offset Setting section) that can be set independently. Further, all NCOs have
independent phase accumulators that continue to run when the specific NCO is not selected, allowing the NCOs
to maintain their phase between selection so that downstream processing does not need to perform carrier
recovery after each hop, for instance.


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