參數(shù)資料
型號(hào)： AD9259ABCPZ-50
廠商： Analog Devices Inc
文件頁數(shù)： 15/52頁
文件大?。?/td> 0K
描述： IC ADC 14BIT SRL 50MSPS 48LFCSP
標(biāo)準(zhǔn)包裝： 1
位數(shù)： 14
采樣率（每秒）： 50M
數(shù)據(jù)接口： 串行，SPI?
轉(zhuǎn)換器數(shù)目： 4
功率耗散（最大）： 409mW
電壓電源： 模擬和數(shù)字
工作溫度： -40°C ~ 85°C
安裝類型： 表面貼裝
封裝/外殼： 48-VFQFN 裸露焊盤，CSP
供應(yīng)商設(shè)備封裝： 48-LFCSP-VQ（7x7）
包裝： 托盤
輸入數(shù)目和類型： 8 個(gè)單端，單極；4 個(gè)差分，單極
AD9259
Data Sheet
Rev. E | Page 22 of 52
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 by
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 47).
The clock input should be treated as an analog signal in cases
where aperture jitter may affect the dynamic range of the AD9259.
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 and to the AN-756
Application Note for more in-depth information about jitter
performance as it relates to ADCs at www.analog.com.
1
10
100
1000
16 BITS
14 BITS
12 BITS
30
40
50
60
70
80
90
100
110
120
130
0.125ps
0.25ps
0.5ps
1.0ps
2.0ps
ANALOG INPUT FREQUENCY (MHz)
10 BITS
RMS CLOCK JITTER REQUIREMENT
S
NR
(
d
B)
05965-
038
Figure 47. Ideal SNR vs. Input Frequency and Jitter
Power Dissipation and Power-Down Mode
As shown in Figure 48, the power dissipated by the AD9259 is
proportional to its sample rate. The digital power dissipation
does not vary significantly because it is determined primarily by
the DRVDD supply and bias current of the LVDS output drivers.
10
20
15
30
35
25
50
40
45
CURRE
NT
(
mA)
ENCODE (MSPS)
250
300
350
450
500
400
0
20
40
100
140
120
200
180
160
60
80
PO
W
ER
(m
W
)
DRVDD CURRENT
TOTAL POWER
AVDD CURRENT
05965-
089
Figure 48. Supply Current vs. fSAMPLE for fIN = 10.3 MHz, fSAMPLE = 50 MSPS
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