參數(shù)資料
型號(hào)： AD9258BCPZ-125
廠商： Analog Devices Inc
文件頁(yè)數(shù)： 21/44頁(yè)
文件大小： 0K
描述： IC ADC 14BIT 125MSPS DL 64LFCSP
設(shè)計(jì)資源： High Performance, Dual Channel IF Sampling Receiver (CN0140)
標(biāo)準(zhǔn)包裝： 1
位數(shù)： 14
采樣率（每秒）： 125M
數(shù)據(jù)接口： 串行
轉(zhuǎn)換器數(shù)目： 2
功率耗散（最大）： 788mW
電壓電源： 模擬和數(shù)字
工作溫度： -40°C ~ 85°C
安裝類型： 表面貼裝
封裝/外殼： 64-VFQFN 裸露焊盤，CSP
供應(yīng)商設(shè)備封裝： 64-LFCSP-VQ（9x9）
包裝： 托盤
輸入數(shù)目和類型： 2 個(gè)差分，單極
AD9258
Rev. A | Page 28 of 44
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.
network. At higher input frequencies, good performance can be
achieved by using a ferrite bead in series with a resistor and
removing the capacitors. However, these values are dependent
on the input signal and should be used only as a starting guide.
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 AD9258. For applications in
which SNR is a key parameter, differential double balun coupling
is the recommended input configuration (see Figure 68). In this
configuration, the input is ac-coupled, and the CML is provided
to each input through a 33 Ω resistor. These resistors compensate
for losses in the input baluns to provide a 50 Ω impedance to
the driver.
Table 10. Example RC Network
Frequency
Range
(MHz)
R1 Series
(Ω Each)
C1 Differential
(pF)
R2 Series
(Ω Each)
C2 Shunt
(pF Each)
0 to 100
33
5
15
100 to 200
10
5
10
100 to 300
Remove
66
Remove
1 In this configuration, R1 is a ferrite bead with a value of 10 Ω @ 100 MHz.
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 69. See the
AD8352 data sheet for more information.
In the double balun and transformer configurations, the value of
the input capacitors and resistors is dependent on the input fre-
quency and source impedance and may need to be reduced or
removed. Table 10 displays recommended values to set the RC
AD9258
R1
0.1F
2V p-p
VIN+
VIN–
VCM
C1
C2
R1
R2
0.1F
S
0.1F
C2
33
33
S
PA
P
08
12
4-
0
38
Figure 68. Differential Double Balun Input Configuration
AD8352
0
0
CD
RD
RG
0.1F
16
1
2
3
4
5
11
0.1F
10
14
0.1F
8, 13
VCC
200
200
ANALOG INPUT
R
C
AD9258
VIN+
VIN–
VCM
08
12
4-
0
39
Figure 69. Differential Input Configuration Using the AD8352
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