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| 型号： | AD9639BCPZ-210 |
| 厂商： | Analog Devices Inc |
| 文件页数： | 13/36页 |
| 文件大小： | 0K |
| 描述： | IC ADC 12B 170MSPS QUAD 72LFCSP |
| 标准包装： | 1 |
| 位数： | 12 |
| 采样率（每秒）： | 210M |
| 数据接口： | 串行，SPI? |
| 转换器数目： | 4 |
| 功率耗散（最大）： | 1.22W |
| 电压电源： | 模拟和数字 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 72-VFQFN 裸露焊盘，CSP |
| 供应商设备封装： | 72-LFCSP |
| 包装： | 托盘 |
| 输入数目和类型： | 8 个单端，单极；4 个差分，单极 |
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AD9639
Data Sheet
Rev. B | Page 20 of 36
Clock Jitter Considerations
High speed, high resolution ADCs are sensitive to the quality of the
clock input. The degradation in SNR at a given input frequency (fA)
due only to aperture jitter (tJ) can be calculated as follows:
SNR Degradation = 20 × log 10(1/2 × π × fA × tJ)
In this equation, the rms aperture jitter represents the root mean
square of all jitter sources, including the clock input, analog input
signal, and ADC aperture jitter. IF undersampling applications
are particularly sensitive to jitter (see Figure 48).
The clock input should be treated as an analog signal in cases
where aperture jitter may affect the dynamic range of the AD9639.
Power supplies for clock drivers should be separated from the
ADC output driver supplies to avoid modulating the clock signal
with digital noise. Low jitter, crystal-controlled oscillators are
the best clock sources. If the clock is generated from another
type of source (by gating, dividing, or another method), it
should be retimed by the original clock during the last step.
Refer to the AN-501 Application Note, the AN-756 Application
Note, and the Analog Dialogue article, “Analog-to-Digital Converter
Clock Optimization: A Test Engineering Perspective” (Volume 42,
Number 2, February 2008) for in-depth information about jitter
performance as it relates to ADCs (visit www.analog.com).
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0.125 ps
0.25 ps
0.5 ps
1.0 ps
2.0 ps
RMS CLOCK JITTER REQUIREMENT
S
NR
(
d
B)
07973-
024
ANALOG INPUT FREQUENCY (MHz)
16 BITS
14 BITS
12 BITS
10 BITS
Figure 48. Ideal SNR vs. Input Frequency and Jitter
Power Dissipation
As shown in Figure 49 and Figure 50, the power dissipated by
the AD9639 is proportional to its clock rate. The digital power
dissipation does not vary significantly because it is determined
primarily by the DRVDD supply and the bias current of the
digital output drivers.
2.0
1.8
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
50
90
70
110
130
150
170
ENCODE (MSPS)
PO
W
ER
(W
)
CURRE
NT
(
mA)
IAVDD
POWER
IDRVDD
07973-
056
Figure 49. Supply Current vs. Encode for fIN = 84.3 MHz, fSAMPLE = 170 MSPS
2.0
1.8
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
50
90
70
110
130
150
170
190
210
ENCODE (MSPS)
PO
W
ER
(W
)
CURRE
NT
(
mA)
IAVDD
POWER
IDRVDD
07973-
057
Figure 50. Supply Current vs. Encode for fIN = 84.3 MHz, fSAMPLE = 210 MSPS
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