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ADC12DJ2700 Datasheet(PDF) 54 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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Maker  TI1 [Texas Instruments]
Homepage  http://www.ti.com
Logo TI1 - Texas Instruments

ADC12DJ2700 Datasheet(HTML) 54 Page - Texas Instruments

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54
ADC12DJ2700
SLVSEH9 – JANUARY 2018
www.ti.com
Product Folder Links: ADC12DJ2700
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Copyright © 2018, Texas Instruments Incorporated
Table 14. Real Decimation (JMODE 9) Output Sample Format
DDC
CHANNEL
ODD,
EVEN
SAMPLE
16-BIT OUTPUT WORD
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
A
Even
DDC A even-numbered sample, 15-bit output data
OVR_T0
A
Odd
DDC A odd-numbered sample, 15-bit output data
OVR_T1
B
Even
DDC B even-numbered sample, 15-bit output data
OVR_T0
B
Odd
DDC B odd-numbered sample, 15-bit output data
OVR_T1
Table 15. Complex Decimation Output Sample Format (Except JMODE 12)
I/Q
SAMPLE
16-BIT OUTPUT WORD
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
I
DDC in-phase (I) 15-bit output data
OVR_T0
Q
DDC quadrature (Q) 15-bit output data
OVR_T1
7.3.6.4 Decimation Settings
7.3.6.4.1
Decimation Factor
The decimation setting is adjustable over the following settings and is set by the JMODE parameter. See
Table 19 for the available JMODE values and the corresponding decimation settings.
DDC Bypass: No decimation, real output
Decimate-by-2: Real output (JMODE 9)
Decimate-by-4: Complex output (JMODE 10 to 12)
Decimate-by-8: Complex output (JMODE 13 to 14)
Decimate-by-16: Complex output (JMODE 15 to 16)
7.3.6.4.2
DDC Gain Boost
The DDC gain boost (see the DDC configuration register) provides additional gain through the DDC block.
Setting BOOST to 1 sets the total decimation filter chain gain to 6.02 dB. With a setting of 0, the total decimation
filter chain has a 0-dB gain. Only use this setting when the negative image of the input signal is filtered out by the
decimation filters, otherwise clipping may occur. There is no reduction in analog performance when gain boost is
enabled or disabled, but care must be taken to understand the reference output power for proper performance
calculations.


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