參數(shù)資料
型號(hào)： AD9634BCPZ-170
廠商： Analog Devices Inc
文件頁數(shù)： 13/32頁
文件大?。?/td> 0K
描述： IC ADC 12BIT 170MSPS 32-LFCSP
標(biāo)準(zhǔn)包裝： 1
位數(shù)： 12
采樣率（每秒）： 170M
數(shù)據(jù)接口： 串行，SPI?
轉(zhuǎn)換器數(shù)目： 1
功率耗散（最大）： 340mW
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： 32-WFQFN 裸露焊盤，CSP
供應(yīng)商設(shè)備封裝： 32-LFCSP-WQ（5x5）
包裝： 托盤
輸入數(shù)目和類型： 2 單端，1 個(gè)差分
AD9634
Rev. 0 | Page 20 of 32
Differential Input Configurations
Optimum performance can be achieved when driving the
AD9634 in a differential input configuration. For baseband
applications, the AD8138, ADA4937-1, and ADA4930-1
differential drivers provide excellent performance and a flexible
interface to the ADC.
The output common-mode voltage of the ADA4930-1 is easily
set with the VCM pin of the AD9634 (see Figure 47), and the
driver can be configured in a Sallen-Key filter topology to
provide band limiting of the input signal.
VIN
76.8
120
0.1F
200
90
AVDD
33
15
5pF
15pF
ADC
VIN–
VIN+
VCM
ADA4930-1
0.1F
09
996-
0
44
Figure 47. Differential Input Configuration Using the ADA4930-1
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, connect the VCM voltage to the center tap of the
secondary winding of the transformer.
2V p-p
49.9
0.1F
R1
C1
ADC
VIN+
VIN–
VCM
C2
R2
R3
R2
C2
R3
0.1F
09
996
-045
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. 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 AD9634. For applications where
SNR is a key parameter, differential double balun coupling is
the recommended input configuration (see Figure 49). In this
configuration, the input is ac-coupled and the VCM voltage 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.
In the double balun and transformer configurations, the value
of the input capacitors and resistors is dependent on the input
frequency and source impedance. Based on these parameters
the value of the input resistors and capacitors may need to be
adjusted, or some components may need to be removed. Table 9
displays recommended values to set the RC network for different
input frequency ranges. However, these values are dependent on
the input signal and bandwidth and should be used only as a
starting guide. Note that the values given in Table 9 are for the
R1, R2, R3, C1, and C2 components shown in Figure 49.
Table 9. Example RC Network
Frequency Range (MHz)
R1 Series (Ω)
C1 Differential (pF)
R2 Series (Ω)
C2 Shunt (pF)
R3 Shunt (Ω)
0 to 100
33
8.2
0
15
49.9
100 to 300
15
3.9
0
8.2
49.9
ADC
R1
0.1F
2V p-p
VIN+
VIN–
VCM
C1
C2
R1
R2
0.1F
S
0.1F
C2
33
S
PA
P
R3
0.1F
09
996-
046
Figure 49. Differential Double Balun Input Configuration
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