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| 型号： | ADL5561ACPZ-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 2.9GHZ 16LFCSP |
| 产品培训模块： | Differential Circuit Design Techniques for Communication Applications |
| 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： | 2.9GHz |
| 电流 - 输入偏压： | 3µA |
| 电流 - 电源： | 40mA |
| 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-VQFN 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： | ADL5561ACPZ-R7DKR |
Data Sheet
ADL5561
Rev. F | 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 shown in Figure 40
08004-
044
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)
ADL5561 DRIVING THE AD9445 14-BIT ADC
GAIN = 6dB
INPUT = 140MHz
SNR = 64.69dBc
SFDR = 87.44dBc
NOISE FLOOR = –107.9dB
FUND = –1.096dBFS
SECOND = –89.64dBc
THIRD = –87.52dBc
Figure 40. Measured Single-Tone Performance of the
Circuit in Figure 39 for a 140 MHz Input Signal
08004-
043
FREQUENCY (MHz)
FIRST POINT = –1.12dBFS
END POINT = –4.38dBFS
MID POINT = –0.81dBFS
MIN = –4.38dBFS
MAX = –0.70dBFS
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
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 ADL5561 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
and AD6655. Table 9 includes antialiasing filter component
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 parasitic.
08004-
041
105
L5
105
AD9246
AD9640
AD6655
1nF
L1
C2
L3
1nF
L1
L3
C4
CML
ADL5561
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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| ADL5561ACPZ-WP | 制造商:Analog Devices 功能描述:2.9 GHZ ULTRALOW DISTORTION RF/IF DIFFERENTIAL AMPLIFIER - Gel-pak, waffle pack, wafer, diced wafer on film |
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| ADL5562ACPZ-WP | 制造商:Analog Devices 功能描述:3.3 GHZ ULTRALOW DISTORTION RF/IF DIFFERENTIAL AMPLIFIER - Waffle Pack 制造商:Analog Devices 功能描述:IC DIFFER AMP 3.3GHZ RF 16LFCSP 制造商:Analog Devices 功能描述:IC, DIFFER AMP, 3.3GHZ, RF, 16LFCSP 制造商:Analog Devices 功能描述:IC, DIFFER AMP, 3.3GHZ, RF, 16LFCSP; Gain:15.5dB; RF IC Case Style:LFCSP; No. of Pins:16; Supply Voltage Min:3V; Supply Voltage Max:3.6V; RF Type:Broadband; Operating Temperature Min:-40C; Operating Temperature Max:85C; MSL:MSL 3 -;RoHS Compliant: Yes |
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