參數資料
型號: AD7764BRUZ-REEL7
廠商: Analog Devices Inc
文件頁數: 20/33頁
文件大小: 0K
描述: IC ADC 24BIT S/D 312KSPS 28TSSOP
標準包裝: 1,000
位數: 24
采樣率(每秒): 312k
數據接口: 串行,SPI?
轉換器數目: 1
功率耗散(最大): 371mW
電壓電源: 模擬和數字
工作溫度: -40°C ~ 85°C
安裝類型: 表面貼裝
封裝/外殼: 28-TSSOP(0.173",4.40mm 寬)
供應商設備封裝: 28-TSSOP
包裝: 帶卷 (TR)
輸入數目和類型: 1 個差分,單極;1 個差分,雙極
AD7764
Rev. A | Page 26 of 32
CLOCKING THE AD7764
The AD7764 requires an external low jitter clock source. This
signal is applied to the MCLK pin. An internal clock signal
(ICLK) is derived from the MCLK input signal. The ICLK
controls the internal operation of the AD7764. The maximum
ICLK frequency is 20 MHz. To generate the ICLK,
ICLK = MCLK/2
For output data rates equal to those used in audio systems, a
12.288 MHz ICLK frequency can be used. As shown in Table 6,
output data rates of 96 kHz and 48 kHz are achievable with this
ICLK frequency.
MCLK JITTER REQUIREMENTS
The MCLK jitter requirements depend on a number of factors
and are given by
20
)
(
10
2
)
(
dB
SNR
f
OSR
t
IN
rms
j
×
π
×
=
where:
OSR = oversampling ratio = fICLK/ODR.
fIN = maximum input frequency.
SNR(dB) = target SNR.
Example 1
This example can be taken from Table 6, where:
ODR = 312.5 kHz.
fICLK = 20 MHz.
fIN (max) = 156.25 kHz.
SNR = 104 dB.
ps
t
rms
j
41
.
51
10
25
.
156
2
64
2
.
5
3
)
(
=
×
π
×
=
This is the maximum allowable clock jitter for a full-scale,
156.25 kHz input tone with the given ICLK and output
data rate.
Example 2
This second example can also be taken from Table 6, where:
ODR = 48 kHz.
fICLK = 12.288 MHz.
fIN (max) = 19.2 kHz.
SNR = 109 dB.
ps
470
10
2
.
19
2
256
45
.
5
3
)
(
=
×
π
×
=
rms
j
t
The input amplitude also has an effect on these jitter figures.
For example, if the input level is 3 dB below full scale, the allow-
able jitter is increased by a factor of √2, increasing the first
example to 144.65 ps rms. This happens when the maximum
slew rate is decreased by a reduction in amplitude.
Figure 49 and Figure 50 illustrate this point, showing the
maximum slew rate of a sine wave of the same frequency but
with different amplitudes.
1.0
–1.0
0.5
0
–0.5
06518-
022
Figure 49. Maximum Slew Rate of a Sine Wave
with an Amplitude of 2 V p-p
1.0
–1.0
0.5
0
–0.5
06518-
023
Figure 50. Maximum Slew Rate of the Same Frequency Sine Wave
as in Figure 49 with an Amplitude of 1 V p-p
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