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| 型号： | ADL5562ACPZ-R7 |
| 厂商： | Analog Devices Inc |
| 文件页数： | 9/24页 |
| 文件大小： | 0K |
| 描述： | IC AMP DIFF RF/IF 3.3GHZ 16LFCSP |
| 产品培训模块： | Differential Circuit Design Techniques for Communication Applications |
| 设计资源： | Using ADL5562 Differential Amplifier to Drive Wide Bandwidth ADCs for High IF AC-Coupled Appls (CN0110) |
| 标准包装： | 1 |
| 放大器类型： | RF/IF 差分 |
| 电路数： | 1 |
| 输出类型： | 差分 |
| 转换速率： | 9800 V/µs |
| -3db带宽： | 3.3GHz |
| 电流 - 输入偏压： | 3µA |
| 电流 - 电源： | 80mA |
| 电压 - 电源，单路/双路(±)： | 3 V ~ 3.6 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-VFQFN 裸露焊盘，CSP |
| 供应商设备封装： | 16-LFCSP-VQ |
| 包装： | 标准包装 |
| 产品目录页面： | 551 (CN2011-ZH PDF) |
| 其它名称： | ADL5562ACPZ-R7DKR |
Data Sheet
ADL5562
Rev. E | Page 17 of 24
This circuit provides variable gain, isolation, and source matching
of 6 dB, an SFDR performance of 87 dBc is achieved at 140 MHz,
and a 3 dB bandwidth of 760 MHz, as indicated in Figure 40
08003-
026
0
6.25 12.50 18.75 25.00 31.25 37.50 43.75 50.00 56.25 62.50
0
–10
–20
–30
–40
–50
–60
–70
–80
–90
–100
–110
–120
–130
–140
–150
(d
B
F
S)
FREQUENCY (MHz)
ADL5562 DRIVING THE AD9445 14-BIT ADC
GAIN = 6dB
INPUT = 140MHz
SNR = 66.25dBc
SFDR = 87.44dBc
NOISE FLOOR = –109.5dB
FUND = –1.081dBFS
SECOND = –84.54dBc
THIRD = –84.54dBc
Figure 40. Measured Single-Tone Performance of the
Circuit in Figure 39 for a 100 MHz Input Signal
08003-
025
FREQUENCY (MHz)
FIRST POINT = –1.02dBFS
END POINT = –5.69dBFS
MID POINT = –1.09dBFS
MIN = –5.69dBFS
MAX = –0.88dBFS
0
–1
–2
–3
–4
–5
–6
–7
–8
–9
–10
2.00
81.90
241.70
401.50
561.30
721.10
161.80
321.60
481.40
641.20
801.00
(d
B
F
S)
Figure 41. Measured Frequency Response of the Wideband
ADC Interface Depicted in Figure 39
The wideband frequency response is an advantage in broad-
band applications, such as predistortion receiver designs and
instrumentation applications. However, by designing for a wide
analog input frequency range, the cascaded SNR performance is
somewhat degraded due to high frequency noise aliasing into
the wanted Nyquist zone.
An alternative narrow-band approach is presented in Figure 42.
By designing a narrow band-pass antialiasing filter between the
outside of the intended Nyquist zone can be attenuated, helping
to preserve the available SNR of the ADC. In general, the SNR
improves several decibels when including a reasonable order anti-
aliasing filter. In this example, a low loss 1:1 input transformer is
used to match the ADL5562 balanced input to a 50 Ω unbalanced
source, resulting in minimum insertion loss at the input.
Figure 42 is optimized for driving some of the Analog Devices
recommendations for popular IF sampling center frequencies.
Inductor L5 works in parallel with the on-chip ADC input
capacitance and a portion of the capacitance presented by C4 to
form a resonant tank circuit. The resonant tank helps to ensure
that the ADC input looks like a real resistance at the target center
frequency. The L5 inductor shorts the ADC inputs at dc, which
introduces a zero into the transfer function. In addition, the ac
coupling capacitors introduce additional zeros into the transfer
function. The final overall frequency response takes on a band-
pass characteristic, helping to reject noise outside of the intended
Nyquist zone. Table 9 provides initial suggestions for prototyping
purposes. Some empirical optimization may be needed to help
compensate for actual PCB parasitics.
08003-
039
105
L5
105
AD9246
AD9640
AD6655
1nF
L1
C2
L3
1nF
L1
L3
C4
CML
ADL5562
4
Figure 42. Narrow-Band IF Sampling Solution for an Unbuffered ADC Application
Table 9. Interface Filter Recommendations for Various IF Sampling Frequencies
Center Frequency (MHz)
1 dB Bandwidth (MHz)
L1 (nH)
C2 (pF)
L3 (nH)
C4 (pF)
L5 (nH)
96
30
3.3
47
27
75
100
140
33
3.3
47
27
33
120
170
32
3.3
56
27
22
110
211
33
3.3
47
27
18
56
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