- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄373891 > AD6655-125EBZ1 (Analog Devices, Inc.) IF Diversity Receiver PDF資料下載
參數(shù)資料
| 型號： | AD6655-125EBZ1 |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | IF Diversity Receiver |
| 中文描述： | IF分集接收機(jī) |
| 文件頁數(shù)： | 30/84頁 |
| 文件大?。?/td> | 2012K |
| 代理商： | AD6655-125EBZ1 |
第1頁第2頁第3頁第4頁第5頁第6頁第7頁第8頁第9頁第10頁第11頁第12頁第13頁第14頁第15頁第16頁第17頁第18頁第19頁第20頁第21頁第22頁第23頁第24頁第25頁第26頁第27頁第28頁第29頁當(dāng)前第30頁第31頁第32頁第33頁第34頁第35頁第36頁第37頁第38頁第39頁第40頁第41頁第42頁第43頁第44頁第45頁第46頁第47頁第48頁第49頁第50頁第51頁第52頁第53頁第54頁第55頁第56頁第57頁第58頁第59頁第60頁第61頁第62頁第63頁第64頁第65頁第66頁第67頁第68頁第69頁第70頁第71頁第72頁第73頁第74頁第75頁第76頁第77頁第78頁第79頁第80頁第81頁第82頁第83頁第84頁
AD6655
An on-board common-mode voltage reference is included in
the design and is available from the CML pin. Optimum perform-
ance is achieved when the common-mode voltage of the analog
input is set by the CML pin voltage (typically 0.55 × AVDD).
Differential Input Configurations
Optimum performance is achieved while driving the AD6655
in a differential input configuration. For baseband applications,
the
AD8138
,
ADA4937-2
, and
ADA4938-2
differential drivers
provide excellent performance and a flexible interface to the
ADC. The output common-mode voltage of the AD8138 is
easily set with the CML pin of the AD6655 (see Figure 47), and
the driver can be configured in a Sallen-Key filter topology to
provide band limiting of the input signal.
Rev. 0 | Page 30 of 84
AVDD
1V p-p
49.9
523
0.1μF
R
R
C
499
499
499
AD8138
AD6655
VIN+
VIN–
CML
0
Figure 47. Differential Input Configuration Using the AD8138
For baseband applications where SNR is a key parameter,
differential transformer coupling is the recommended input
configuration. An example is shown in Figure 48. To bias the
analog input, the CML voltage can be connected to the center
tap of the secondary winding of the transformer.
2V p-p
49.9
0.1μF
R
R
C
AD6655
VIN+
VIN–
CML
0
Figure 48. Differential Transformer-Coupled Configuration
The signal characteristics must be considered when selecting
a transformer. Most RF transformers saturate at frequencies
below a few megahertz (MHz). Excessive signal power can also
cause core saturation, which leads to distortion.
At input frequencies in the second Nyquist zone and above, the
noise performance of most amplifiers is not adequate to achieve
the true SNR performance of the AD6655. For applications where
SNR is a key parameter, differential double balun coupling is
the recommended input configuration (see Figure 49).
An alternative to using a transformer-coupled input at
frequencies in the second Nyquist zone is to use the AD8352
differential driver is shown in Figure 50. See the
AD8352
data
sheet for more information. In addition, if the application
requires an amplifier with variable gain, the
AD8375
or
AD8376
digital variable gain amplifiers (DVGAs) provide good
performance driving the AD6655.
In any configuration, the value of the shunt capacitor, C, is
dependent on the input frequency and source impedance and
may need to be reduced or removed. Table 14 displays recom-
mended values to set the RC network. However, these values are
dependent on the input signal and should be used only as a
starting guide.
Table 14. Example RC Network
Frequency Range
(MHz)
0 to 70
70 to 200
200 to 300
>300
R Series
(Ω, Each)
33
33
15
15
C Differential
(pF)
15
5
5
Open
AD6655
R
0.1μF
0.1μF
2V p-p
VIN+
VIN–
CML
C
R
0.1μF
S
0.1μF
25
25
S
P
A
P
0
Figure 49. Differential Double Balun Input Configuration
AD6655
AD8352
0
R
0
C
D
R
D
R
G
0.1μF
0.1μF
0.1μF
VIN+
VIN–
CML
C
0.1μF
16
1
2
3
4
5
11
R
0.1μF
0.1μF
10
14
0.1μF
8, 13
V
CC
200
200
ANALOG INPUT
ANALOG INPUT
0
Figure 50. Differential Input Configuration Using the AD8352
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| AD6655-150EBZ1 | IF Diversity Receiver |
| AD6655BCPZ-1051 | IF Diversity Receiver |
| AD6655BCPZ-1501 | IF Diversity Receiver |
| AD6655BCPZ-801 | IF Diversity Receiver |
| AD667JN | Microprocessor-Compatible 12-Bit D/A Converter |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AD6655-150EBZ | 功能描述:BOARD EVAL FOR 150MSPS AD6655 RoHS:是 類別:RF/IF 和 RFID >> RF 評估和開發(fā)套件，板 系列:- 標(biāo)準(zhǔn)包裝:1 系列:- 類型:GPS 接收器 頻率:1575MHz 適用于相關(guān)產(chǎn)品:- 已供物品:模塊 其它名稱:SER3796 |
| AD6655-150EBZ1 | 制造商:AD 制造商全稱:Analog Devices 功能描述:IF Diversity Receiver |
| AD6655ABCPZ-105 | 功能描述:IC IF RCVR 14BIT 105MSPS 64LFCSP RoHS:是 類別:RF/IF 和 RFID >> RF 其它 IC 和模塊 系列:- 標(biāo)準(zhǔn)包裝:100 系列:* |
| AD6655ABCPZ-125 | 功能描述:IC IF RCVR 14BIT 125MSPS 64LFCSP RoHS:是 類別:RF/IF 和 RFID >> RF 其它 IC 和模塊 系列:- 標(biāo)準(zhǔn)包裝:100 系列:* |
| AD6655ABCPZ-150 | 功能描述:IC IF RCVR 14BIT 150MSPS 64LFCSP RoHS:是 類別:RF/IF 和 RFID >> RF 其它 IC 和模塊 系列:- 標(biāo)準(zhǔn)包裝:100 系列:* |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。