AD6657AEBZ Analog Devices, AD6657AEBZ Datasheet - Page 26

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AD6657AEBZ

Manufacturer Part Number
AD6657AEBZ
Description
Data Conversion IC Development Tools 11 Bit 200 Msps Quad IF Receiver
Manufacturer
Analog Devices
Type
ADCr
Series
AD6657Ar
Datasheet

Specifications of AD6657AEBZ

Rohs
yes
Product
Evaluation Boards
Tool Is For Evaluation Of
AD6657A
Interface Type
SPI, USB
Operating Supply Voltage
6 V
Description/function
Quad IF receiver with noise shaping requantizer
Maximum Operating Temperature
+ 85 C
Minimum Operating Temperature
- 40 C
Operating Supply Current
2 A
Factory Pack Quantity
1
For Use With
HSC-ADC-EVALCZ
33% BW MODE (>60 MHZ AT 184.32 MSPS)
The second bandwidth mode offers excellent noise performance
over 33% of the ADC sample rate (66% of the Nyquist band)
and can be centered by setting the NSR mode bits in the NSR
control register (Address 0x3C) to 001. In this mode, the useful
frequency range can be set using the 6-bit tuning word in the
NSR tuning word register (Address 0x3E).
There are 34 possible tuning words (TW); each step is 0.5% of
the ADC sample rate. The following three equations describe
the left band edge (f
band edge (f
Figure 54 to Figure 56 show the typical spectrum that can be
expected from the
different tuning words.
AD6657A
f
f
f
0
CENTER
1
–100
–120
–140
–100
–120
–140
–20
–40
–60
–80
–20
–40
–60
–80
= f
= f
Figure 55. 33% BW Mode, Tuning Word = 17 (f
0
0
ADC
0
0
0
+ 0.33 × f
= f
1
× .005 × TW
9.25 18.50 27.75 37.00 46.25 55.50 64.75 74.00 83.25 92.50
9.25 18.50 27.75 37.00 46.25 55.50 64.75 74.00 83.25 92.50
), respectively.
0
Figure 54. 33% BW Mode, Tuning Word = 5
+ 0.165 × f
AD6657A
0
ADC
), the channel center (f
ADC
FREQUENCY (MHz)
FREQUENCY (MHz)
in the 33% BW mode for three
THIRD HARMONIC
THIRD HARMONIC
185MSPS
140.3MHz @ –1dBFS
NSR 33% BW MODE, TW = 17
SNR = 71.1dB (72.7dBFS)
SFDR = 91dBc
185MSPS
140.3MHz @ –1dBFS
NSR 33% BW MODE, TW = 5
SNR = 70.9dB (72.5dBFS)
SFDR = 91dBc
CENTER
S
/4 Tuning)
), and the right
Rev. 0 | Page 26 of 36
–100
–120
–140
–20
–40
–60
–80
0
0
9.25 18.50 27.75 37.00 46.25 55.50 64.75 74.00 83.25 92.50
Figure 56. 33% BW Mode, Tuning Word = 17
FREQUENCY (MHz)
THIRD HARMONIC
185MSPS
140.3MHz @ –1dBFS
NSR 33% BW MODE, TW = 17
SNR = 70.9dB (72.5dBFS)
SFDR = 91dBc
Data Sheet

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