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AD6677EBZ Arkusz danych(PDF) 23 Page - Analog Devices

Numer części AD6677EBZ
Szczegółowy opis  80 MHz Bandwidth, IF Receiver
PDF  48 Pages
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Producent  AD [Analog Devices]
Strona internetowa  http://www.analog.com
Logo AD - Analog Devices

AD6677EBZ Arkusz danych(HTML) 23 Page - Analog Devices

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Data Sheet
AD6677
Rev. C | Page 23 of 48
NOISE SHAPING REQUANTIZER
The AD6677 features a NSR to allow higher than 11-bit SNR to
be maintained in a subset of the Nyquist band. The harmonic
performance of the receiver is unaffected by the NSR feature. When
enabled, the NSR contributes an additional 0.6 dB of loss to the
input signal, such that a 0 dBFS input is reduced to −0.6 dBFS at
the output pins.
Two different bandwidth modes are provided; the mode can be
selected from the SPI port. In each of the two modes, the center
frequency of the band can be tuned such that IFs can be placed
anywhere in the Nyquist band.
22% BANDWIDTH MODE (>40 MHZ AT
184.32 MSPS)
The first bandwidth mode offers excellent noise performance
over 22% of the ADC sample rate (44% of the Nyquist band) and
can be centered by setting the NSR mode bit in the NSR control
register (Address 0x3C) to 0. In this mode, the useful frequency
range can be set using the 6-bit tuning word in the NSR tuning
words register (Address 0x3E). There are 57 possible tuning
words (TW); each step is 0.5% of the ADC sample rate. The
following three equations describe the left band edge (f0), the
channel center (fCENTER), and the right band edge (f1),
respectively:
f0 = fADC × 0.005 × TW
fCENTER = f0 + 0.11 × fADC
f1 = f0 + 0.22 × fADC
Figure 45 to Figure 47 show the typical spectrum that can be
expected from the AD6677 in the 22% bandwidth mode for
three different tuning words.
–140
–120
–100
–80
–60
–40
–20
0
0
25
50
75
100
125
FREQUENCY (Hz)
250MSPS
180.1MHz AT –1.6dBFS
SNR = 72.8dB (74.4dBFS)
SFDR = 92dBc (IN-BAND)
Figure 45. 22% Bandwidth Mode, Tuning Word = 13
–140
–120
–100
–80
–60
–40
–20
0
0
25
50
75
100
125
FREQUENCY (Hz)
250MSPS
180.1MHz AT –1.6dBFS
SNR = 72.9dB (74.5dBFS)
SFDR = 88dBc (IN-BAND)
Figure 46. 22% Bandwidth Mode, Tuning Word = 28 (fS/4 Tuning)
–140
–120
–100
–80
–60
–40
–20
0
0
25
50
75
100
125
FREQUENCY (Hz)
250MSPS
180.1MHz AT –1.6dBFS
SNR = 72.9dB (74.5dBFS)
SFDR = 87dBc (IN-BAND)
Figure 47. 22% Bandwidth Mode, Tuning Word = 41



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