參數資料
型號： AD9608BCPZRL7-105
廠商： Analog Devices Inc
文件頁數： 17/40頁
文件大?。?/td> 0K
描述： IC ADC 10BIT 105MSPS 64LFCSP
標準包裝： 750
位數： 10
采樣率（每秒）： 105M
數據接口： LVDS，并聯(lián)，串行，SPI
轉換器數目： 2
電壓電源： 模擬和數字
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
供應商設備封裝： 64-LFCSP-VQ（9x9）
包裝： 帶卷 (TR)
輸入數目和類型： 4 個單端，2 個差分
AD9608
Rev. 0 | Page 24 of 40
Input Common Mode
The analog inputs of the AD9608 are not internally dc-biased.
Therefore, in ac-coupled applications, the user must provide
a dc bias externally. Setting the device so that VCM = AVDD/2
is recommended for optimum performance, but the device can
function over a wider range with reasonable performance, as
shown in Figure 43.
An on-board, common-mode voltage reference is included in
the design and is available from the VCM pin. The VCM pin
must be decoupled to ground by a 0.1 μF capacitor, as described
0
10
20
30
40
50
60
70
80
90
100
0.5
0.6
0.7
0.8
0.9
1.0
1.1
1.2
1.3
S
NR/
S
F
D
R
(
d
BF
S
/d
B
c)
INPUT COMMON-MODE VOLTAGE (V)
SFDR (dBc)
SNR (dBFS)
099
77-
056
Figure 43. SNR/SFDR vs. Input Common-Mode Voltage,
fIN = 70 MHz, fS = 125 MSPS
Differential Input Configurations
Optimum performance is achieved while driving the AD9608 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 ADA4938-2 is easily
set with the VCM pin of the AD9608 (see Figure 44), and the
driver can be configured in a Sallen-Key filter topology to
provide band limiting of the input signal.
AVDD
VIN
76.8
120
0.1F
33
10pF
200
90
ADA4938
ADC
VIN–x
VIN+x
VCM
09
977
-0
50
Figure 44. Differential Input Configuration Using the ADA4938-2
For baseband applications below ~10 MHz where SNR is a key
parameter, differential transformer coupling is the recommended
input configuration (see Figure 45). To bias the analog input,
the VCM voltage can be connected to the center tap of the
secondary winding of the transformer.
2V p-p
49.9
0.1F
R
C
ADC
VCM
VIN+x
VIN–x
0997
7-
051
Figure 45. Differential Transformer-Coupled Configuration
The signal characteristics must be considered when selecting
a transformer. Most RF transformers saturate at frequencies that
are 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 AD9608. For applications above
~10 MHz where SNR is a key parameter, differential double balun
coupling is the recommended input configuration (see Figure 46).
An alternative to using a transformer-coupled input at frequencies
in the second Nyquist zone is to use the AD8352 differential driver
(see Figure 47). See the AD8352 data sheet for more information.
ADC
R
0.1F
2V p-p
VCM
C
R
0.1F
S
0.1F
25
S
PA
P
VIN+x
VIN–x
099
77-
053
Figure 46. Differential Double Balun Input Configuration
AD8352
0
CD
RD
RG
0.1F
16
1
2
3
4
5
11
0.1F
10
14
0.1F
8, 13
VCC
200
ANALOG INPUT
R
C
ADC
VCM
VIN+x
VIN–x
099
77-
054
Figure 47. Differential Input Configuration Using the AD8352
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