參數(shù)資料
型號: AD962711-105EBZ
廠商: Analog Devices Inc
文件頁數(shù): 17/72頁
文件大?。?/td> 0K
描述: BOARD EVALUATION AD9627 105MSPS
標(biāo)準(zhǔn)包裝: 1
ADC 的數(shù)量: 2
位數(shù): 11
采樣率(每秒): 105M
數(shù)據(jù)接口: 串行
輸入范圍: 1 ~ 2 Vpp
在以下條件下的電源(標(biāo)準(zhǔn)): 600mW @ 105MSPS
工作溫度: -40°C ~ 85°C
已用 IC / 零件: AD962711
已供物品:
AD9627-11
Rev. B | Page 24 of 72
The output common-mode voltage of the AD8138 is easily set
with the CML pin of the AD9627-11 (see Figure 46), and the
driver can be configured in a Sallen-Key filter topology to
provide band limiting of the input signal.
AVDD
1V p-p
49.9
523
0.1F
R
C
499
499
499
AD8138
AD9627-11
VIN+
VIN–
CML
070
54-
04
6
Figure 46. 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 47. 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
0.1F
R
C
AD9627-11
VIN+
VIN–
CML
07
05
4-
0
47
Figure 47. 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 AD9627-11. 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.
An example is shown in Figure 50. See the AD8352 data sheet
for more information.
In any configuration, the value of Shunt Capacitor C is dependent
on the input frequency and source impedance and may need to
be reduced or removed. Table 10 displays recommended 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 10. Example RC Network
Frequency Range (MHz)
R Series
(Ω Each)
C Differential (pF)
0 to 70
33
15
70 to 200
33
5
200 to 300
15
5
>300
15
Open
Single-Ended Input Configuration
A single-ended input can provide adequate performance in cost
sensitive applications. In this configuration, SFDR and distortion
performance degrade due to the large input common-mode swing.
If the source impedances on each input are matched, there should
be little effect on SNR performance. Figure 48 shows a typical
single-ended input configuration.
1V p-p
R
C
49.9
0.1F
10F
0.1F
AVDD
1k
1k
1k
1k
AD9627-11
AVDD
VIN+
VIN–
0
705
4-
0
48
Figure 48. Single-Ended Input Configuration
AD9627-11
R
0.1F
2V p-p
VIN+
VIN–
CML
C
R
0.1F
S
0.1F
25
25
S
PA
P
07
05
4-
04
9
Figure 49. Differential Double Balun Input Configuration
AD9627-11
AD8352
0
R
0
CD
RD
RG
0.1F
VIN+
VIN–
CML
C
0.1F
16
1
2
3
4
5
11
R
0.1F
10
14
0.1F
8, 13
VCC
200
200
ANALOG INPUT
07
05
4-
05
0
Figure 50. Differential Input Configuration Using the AD8352
OBSOLETE
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