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AD6623AS データシート(PDF) 24 Page - Analog Devices

部品番号 AD6623AS
部品情報  4-Channel, 104 MSPS Digital Transmit Signal Processor TSP
PDF  40 Pages
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メーカー  AD [Analog Devices]
ホームページ  http://www.analog.com
Logo AD - Analog Devices

AD6623AS データシート(HTML) 24 Page - Analog Devices

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REV. 0
AD6623
–24–
LrCIC2–1 should be confined to the ranges shown by Table XIII
according to the interpolation factor of the CIC5. Exceeding the
recommended guidelines may result in overflow for input sequences
at or near full scale. While relatively large ratios of LrCIC2/MrCIC2
allow for the larger overall interpolations with minimal power
consumption, LrCIC2/MrCIC2 should be minimized to achieve the
best overall image rejection.
As an example, consider an input from the CIC5 whose bandwidth
is 0.0033 of the CIC5 rate, centered at baseband. Interpolation
by a factor of five reveals five images, as shown below.
–150
–2
–1
01
2
–130
–110
–90
–70
–50
–30
–10
10
Figure 29. CIC5 Interpolation Images
The rCIC2 rejects each of the undesired images while passing
the image at baseband. The images of a pure tone at channel
center (DC) are nulled perfectly, but as the bandwidth increases
the rejection is diminished. The lower band edge of the first
image always has the least rejection. In this example, the rCIC2
is interpolating by a factor of five and the input signal has a
bandwidth of 0.0033 of the CIC5 output sample rate. Figure 30
below shows –110 dBc rejection of the lower band edge of the
first image. All other image frequencies have better rejection.
10
–10
–30
–33
–2
–1
012
–50
–70
–90
–110
–130
–150
Figure 30. rCIC2 –110 dBc
Table XIV lists maximum bandwidth that will be rejected to
various levels for CIC2 interpolation factors from 1 to 32. The
example above corresponds to the listing in the –110 dB column
and the LCIC2 = 5 row. The rejection of the CIC2 improves as
the interpolation factor increases.
Table XIV. Maximum Bandwidth of Rejection for LCIC2 Values
–110 dB
–100 dB
–90 dB
–80 dB
–70 dB
Full
Full
Full
Full
Full
0.0023
0.0040
0.0072
0.0127
0.0226
0.0029
0.0052
0.0093
0.0165
0.0292
0.0032
0.0057
0.0101
0.0179
0.0316
0.0033
0.0059
0.0105
0.0186
0.0328
0.0034
0.0060
0.0107
0.0189
0.0334
0.0034
0.0061
0.0108
0.0192
0.0338
0.0035
0.0062
0.0109
0.0193
0.0341
0.0035
0.0062
0.0110
0.0194
0.0343
0.0035
0.0062
0.0110
0.0195
0.0344
0.0035
0.0062
0.0110
0.0195
0.0345
0.0035
0.0062
0.0111
0.0196
0.0346
0.0035
0.0062
0.0111
0.0196
0.0346
0.0035
0.0063
0.0111
0.0196
0.0347
0.0035
0.0063
0.0111
0.0197
0.0347
0.0035
0.0063
0.0111
0.0197
0.0347
0.0035
0.0063
0.0111
0.0197
0.0348
0.0035
0.0063
0.0111
0.0197
0.0348
0.0035
0.0063
0.0111
0.0197
0.0348
0.0035
0.0063
0.0111
0.0197
0.0348
0.0035
0.0063
0.0111
0.0197
0.0348
0.0035
0.0063
0.0111
0.0197
0.0348
0.0035
0.0063
0.0111
0.0197
0.0348
0.0035
0.0063
0.0112
0.0197
0.0348
0.0035
0.0063
0.0112
0.0198
0.0349
0.0035
0.0063
0.0112
0.0198
0.0349
0.0035
0.0063
0.0112
0.0198
0.0349
0.0035
0.0063
0.0112
0.0198
0.0349
0.0035
0.0063
0.0112
0.0198
0.0349
0.0035
0.0063
0.0112
0.0198
0.0349
0.0035
0.0063
0.0112
0.0198
0.0349
0.0035
0.0063
0.0112
0.0198
0.0349
NUMERICALLY CONTROLLED OSCILLATOR/TUNER (NCO)
Each channel has a fully independent tuner. The tuner accepts
data from the CIC filter, tunes it to a digital Intermediate Fre-
quency (IF), and passes the result to a shared summation block.
The tuner consists of a 32-bit quadrature NCO and a Quadrature
Amplitude Mixer (QAM). The NCO serves as a local oscillator and
the QAM translates the interpolated channel data from baseband
to the NCO frequency. The worst case spurious signal from the
NCO is better than –100 dBc for all output frequencies. The
tuner can produce real or complex outputs as requested by the
shared summation block.
In the complex mode, the NCO serves as a quadrature local oscillator
running at fCLK/2 capable of producing any frequency step between
–fCLK/4 and +fCLK/4 with a resolution of fCLK/2
33 (0.0121 Hz for
fCLK = 104 MHz).
In the real mode, the NCO serves as a quadrature local oscillator
running at fCLK capable of producing any frequency step between
–fCLK/2 and +fCLK/2 with a resolution of fCLK/2
32 (0.0242 Hz for
fCLK = 104 MHz). The quadrature portion of the output is
discarded. Negative frequencies are distinguished from positive



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