參數(shù)資料
型號(hào)： AD9216BCPZ-65
廠商： Analog Devices Inc
文件頁(yè)數(shù)： 14/40頁(yè)
文件大?。?/td> 0K
描述： IC ADC 10BIT DUAL 65MSPS 64LFCSP
標(biāo)準(zhǔn)包裝： 1
位數(shù)： 10
采樣率（每秒）： 65M
數(shù)據(jù)接口： 并聯(lián)
轉(zhuǎn)換器數(shù)目： 2
功率耗散（最大）： 240mW
電壓電源： 單電源
工作溫度： -40°C ~ 85°C
安裝類(lèi)型： 表面貼裝
封裝/外殼： 64-LFQFN 裸露焊盤(pán)，CSP
供應(yīng)商設(shè)備封裝： 64-LFCSP-VQ（6x6）
包裝： 托盤(pán)
輸入數(shù)目和類(lèi)型： 4 個(gè)單端，單極；2 個(gè)差分，單極
產(chǎn)品目錄頁(yè)面： 780 (CN2011-ZH PDF)
AD9216
Rev. A | Page 21 of 40
For example, a 2 V p-p signal may be applied to VIN+, while a
1 V reference is applied to VIN. The AD9216 then accepts an
input signal varying between 2 V and 0 V. In the single-ended
configuration, distortion performance may degrade signifi-
cantly as compared to the differential case. However, the effect
is less noticeable at lower input frequencies.
04775-009
40
45
50
55
60
65
70
75
80
85
0.25
0.75
1.25
1.75
2.25
2.75
dB
ANALOG INPUT COMMON-MODE VOLTAGE (V)
2V p-p SFDR
2V p-p SNR
Figure 42. Input Common-Mode Voltage Sensitivity
Differential Input Configurations
As previously detailed, optimum performance is achieved while
driving the AD9216 in a differential input configuration. For
baseband applications, the AD8138 differential driver provides
excellent performance and a flexible interface to the ADC. The
output common-mode voltage of the AD8138 is easily set to
AVDD/2, and the driver can be configured in a Sallen-Key filter
topology to provide band limiting of the input signal.
At input frequencies in the second Nyquist zone and above, the
performance of most amplifiers is not adequate to achieve the
true performance of the AD9216. This is especially true in IF
under-sampling applications where frequencies in the 70 MHz
to 200 MHz range are being sampled. For these applications,
differential transformer coupling is the recommended input
configuration, as shown in Figure 43.
AD9216
VIN_A
VIN_B
AVDD
AGND
2V p-p
50
50
10pF
49.9
1k
1k
0.1
F
04775-010
Figure 43. Differential Transformer Coupling
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 also cause
core saturation, which leads to distortion.
For dc-coupled applications, the AD8138, AD8139, or
AD8351 can serve as a convenient ADC driver, depending on
requirements. Figure 44 shows an example with the AD8138.
The AD9216 PCB has an optional AD8139 on board, as shown
in Figure 53. Note the AD8351 typically yields better perform-
ance for frequencies greater than 30 MHz to 40 MHz.
04775-011
AD9216
AD8138
VIN+
AVDD
AGND
0.1
F
20pF
33
33
VIN–
49.9
1k
1k
499
499
523
499
Figure 44. Driving the ADC with the AD8138
FULL
SCALE/2
SENSE = GROUND
VIN+
VIN–
DIGITAL OUT = ALL ONES
DIGITAL OUT = ALL ZEROES
04775-012
AVDD/2
Figure 45. Analog Input Full Scale (Full Scale = 2 V)
Single-Ended Input Configuration
A single-ended input may provide adequate performance in
cost-sensitive applications. In this configuration, there is a
degradation in SFDR and distortion performance due to the
large input common-mode swing. However, if the source
impedances on each input are matched, there should be little
effect on SNR performance.
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