参数资料
型号: AD6657BBCZ
厂商: ANALOG DEVICES INC
元件分类: 无绳电话/电话
英文描述: Quad IF Receiver; Package: Chip Scale BGA; No of Pins: 144; Temperature Range: Ind
中文描述: TELECOM, CELLULAR, RF AND BASEBAND CIRCUIT, PBGA144
封装: 10 X 10 MM, 1.40 MM HEIGHT, ROHS COMPLIANT, MO-205AC, CSPBGA-144
文件页数: 16/32页
文件大小: 1021K
代理商: AD6657BBCZ
AD6657
Rev. A | Page 23 of 32
Figure 48 to Figure 50 show the typical spectrum that can be
expected from the AD6657 in the 33% BW mode for three
different tuning words.
020
40
60
90
10
30
50
80
70
0
–20
–40
–60
–80
–100
0
855
7-
0
47
A
M
P
L
IT
UDE
(
d
B
F
S
)
FREQUENCY (MHz)
fS = 184.32MSPS
fIN = 140MHz @ –1.6dBFS
NSR 33% BW MODE, TW = 5
SNR = 71dB (72.5dBFS) (IN-BAND)
SFDR = 92.5dBc (IN-BAND)
–120
Figure 48. 33% BW Mode, Tuning Word = 5
020
40
60
90
10
30
50
80
70
0
–20
–40
–60
–80
–100
–120
0
855
7-
0
48
AM
P
L
IT
U
D
E
(
d
BF
S
)
FREQUENCY (MHz)
fS = 184.32MSPS
fIN = 140MHz @ –1.6dBFS
NSR 33% BW MODE, TW = 17
SNR = 71.2dB (72.8dBFS) (IN-BAND)
SFDR = 93.7dBc (IN-BAND)
Figure 49. 33% BW Mode, Tuning Word = 17 (fS/4 Tuning)
020
40
60
90
10
30
50
80
70
0
–20
–40
–60
–80
–100
–120
0
855
7-
0
49
A
M
P
L
IT
UDE
(
d
B
F
S
)
FREQUENCY (MHz)
fS = 184.32MSPS
fIN = 140MHz @ –1.6dBFS
NSR 33% BW MODE, TW = 27
SNR = 71dB (72.5dBFS) (IN-BAND)
SFDR = 93dBc (IN-BAND)
Figure 50. 33% BW Mode, Tuning Word = 27
MODE PIN
The MODE pin input allows convenient control of the NSR
feature. A logic low enables NSR mode and a logic high sets the
receiver to straight 11-bit mode with NSR disabled. By default,
the MODE pin is pulled high internally to disable the NSR.
Each channel can be individually configured to ignore the
MODE pin state by writing to Bit 4 of the NSR control register
at Address 0x3C. Use of the NSR control register in conjunction
with the MODE pin allows for very flexible control of the NSR
feature on a per-channel basis.
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