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參數(shù)資料
| 型號： | AD7864AS-2 |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | ADC |
| 英文描述： | 4-Channel, Simultaneous Sampling, High Speed, 12-Bit ADC |
| 中文描述： | 4-CH 12-BIT SUCCESSIVE APPROXIMATION ADC, PARALLEL ACCESS, PQFP44 |
| 封裝： | PLASTIC, MO-112-AA, MQFP-44 |
| 文件頁數(shù)： | 16/19頁 |
| 文件大小： | 214K |
| 代理商： | AD7864AS-2 |
AD7864
–16–
REV. A
AC Linearity Plots
The plots shown in Figure 18 below show typical DNL and INL
plots for the AD7864.
0
500
1000
1500
2000
2500
3000
3500
4000
3.00E–01
2.00E–01
1.00E–01
0.00E+00
–1.00E–01
–2.00E–01
–3.00E–01
ADC CODE
D
–5.00E–02
0.00E+00
5.00E–02
1.00E–01
1.50E–01
2.00E–01
2.50E–01
0
500
1000
1500
2000
2500
3000
3500
4000
ADC CODE
I
–2.50E–01
–2.00E–01
–1.50E–01
–1.00E–01
Figure 18. Typical DNL and INL Plots
Measuring Aperture Jitter
A convenient way to measure aperture jitter is to use the rela-
tionship it is known to have with SNR (Signal to Noise plus
distortion) given below:
(
SNR
J
ITTER
= Signal to Noise due to the rms time jitter
σ
= rms time jitter
f
IN
= sinusoidal input frequency (1 MHz in this case)
From Equation 3 above it can be seen that the signal-to-noise
ratio due to jitter degrades significantly with frequency. There-
fore, at low input frequencies the measured SNR performance
of the AD7864 is indicative of noise performance due to quanti-
zation noise and system noise only (72 dBs used as a typical
figure here).
Therefore, by measuring the overall SNR performance (includ-
ing noise due to jitter, system and quantization) of the AD7864 a
good estimation of the jitter performance of the AD7864 can be
calculated.
SNR
f
where
ITTER
J
IN
=
×
×
×
×
20
1
2
10
log
),
π
σ
(3)
FREQUENCY – Hz
12
11
5
900000
1100000
950000
1000000
1050000
9
8
7
6
10
E
Figure 19. ENOBs of the AD7864 at 1 MHz
From Figure 19 above the ENOBs of the AD7864 at 1 MHz is
approximately 11 bits. This is equivalent to 68 dBs SNR.
SNR
TOTAL
= SNR
JITTER
+ SNR
QUANT
= 68 dBs
68 dBs = SNR
JITTER
+ 72 dBs (at 100 kHz)
SNR
JITTER
= 70.2 dBs
From (3) above
70.2 dBs = 20
×
log
10
[1/(2
×
π
×
1 MHz
×
σ
)]
σ =
49 ps where
σ
is the rms jitter of the AD7864
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AD7864AS-2REEL | 制造商:Analog Devices 功能描述:ADC Single SAR 520ksps 12-bit Parallel 44-Pin MQFP T/R |
| AD7864AS-2Z | 制造商:Analog Devices 功能描述:ADC 12BIT 4CH 500KSPS 44MQ 制造商:Analog Devices 功能描述:ADC, 12BIT, 4CH, 500KSPS, 44MQFP; Resolution (Bits):12bit; Sampling Rate:520kSPS; Supply Voltage Type:Single; Supply Voltage Min:4.75V; Supply Voltage Max:5.25V; Supply Current:24mA; Digital IC Case Style:MQFP; No. of Pins:44; Input ;RoHS Compliant: Yes |
| AD7864AS-3 | 制造商:Analog Devices 功能描述:ADC Single SAR 520ksps 12-bit Parallel 44-Pin MQFP 制造商:Analog Devices 功能描述:IC 12-BIT ADC |
| AD7864AS-3REEL | 制造商:Analog Devices 功能描述:ADC Single SAR 520ksps 12-bit Parallel 44-Pin MQFP T/R |
| AD7864AS-3Z | 制造商:Analog Devices 功能描述:ADC 12BIT 4CH 500KSPS 44MQ 制造商:Analog Devices 功能描述:ADC, 12BIT, 4CH, 500KSPS, 44MQFP; Resolution (Bits):12bit; Sampling Rate:520kSPS; Supply Voltage Type:Single; Supply Voltage Min:4.75V; Supply Voltage Max:5.25V; Supply Current:24mA; Digital IC Case Style:MQFP; No. of Pins:44; Input ;RoHS Compliant: Yes |
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