参数资料
型号: AD9233-80EBZ
厂商: Analog Devices Inc
文件页数: 8/44页
文件大小: 0K
描述: BOARD EVAL FOR AD9233
标准包装: 1
ADC 的数量: 1
位数: 12
采样率(每秒): 80M
数据接口: 串行,SPI?
输入范围: 1 ~ 2 Vpp
在以下条件下的电源(标准): 288mW @ 80kSPS
工作温度: -40°C ~ 85°C
已用 IC / 零件: AD9233
已供物品:
AD9233
Rev. A | Page 16 of 44
0
54
92-
038
AVDD
1V p-p
49.9
523
0.1F
R
C
499
AD8138
AD9233
VIN+
VIN–
CML
Figure 37. 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 38. The CML
voltage can be connected to the center tap of the secondary
winding of the transformer to bias the analog input.
The signal characteristics must be considered when selecting a
transformer. Most RF transformers saturate at frequencies
below a few MHz, and excessive signal power can cause core
saturation, which leads to distortion.
0
549
2-
0
39
2V p-p
49.9
0.1F
R
C
AD9233
VIN+
VIN–
CML
Figure 38. Differential Transformer-Coupled Configuration
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 AD9233. For applications
where SNR is a key parameter, transformer coupling is the
recommended input. For applications where SFDR is a key
parameter, differential double balun coupling is the recom-
mended input configuration. An example is shown in Figure 39.
As an alternative to using a transformer-coupled input at
frequencies in the second Nyquist zone, the AD8352 differential
driver can be used. An example is shown in Figure 40.
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 8 displays
recommended values to set the RC network. However, these
values are dependant on the input signal and should only be
used as a starting guide.
Table 8. RC Network Recommended Values
Frequency Range (MHz)
R Series (Ω)
C Differential (pF)
0 to 70
33
15
70 to 200
33
5
200 to 300
15
5
>300
15
Open
AD9233
R
0.1F
2V p-p
VIN+
VIN–
CML
C
R
0.1F
S
0.1F
0
54
92
-08
9
25
S
PA
P
Figure 39. Differential Double Balun Input Configuration
AD9233
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
8, 13
14
VCC
200
05
49
2-
0
88
ANALOG INPUT
Figure 40. Differential Input Configuration Using the AD8352
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