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| 型号： | AD7851KRZ-REEL |
| 厂商： | Analog Devices Inc |
| 文件页数： | 10/36页 |
| 文件大小： | 0K |
| 描述： | IC ADC 14BIT SRL 333KSPS 24-SOIC |
| 标准包装： | 1,000 |
| 位数： | 14 |
| 采样率（每秒）： | 333k |
| 数据接口： | 8051，QSPI?，串行，SPI? µP |
| 转换器数目： | 2 |
| 功率耗散（最大）： | 89.25mW |
| 电压电源： | 模拟和数字 |
| 工作温度： | 0°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 24-SOIC（0.295"，7.50mm 宽） |
| 供应商设备封装： | 24-SOIC W |
| 包装： | 带卷 (TR) |
| 输入数目和类型： | 1 个伪差分，单极；1 个伪差分，双极 |
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AD7851
–18–
REV. B
REFERENCE SECTION
For specified performance, it is recommended that when using
an external reference this reference should be between 4 V and
the analog supply AVDD. The connections for the relevant refer-
ence pins are shown in the typical connection diagrams. If the
internal reference is being used, the REFIN/REFOUT pin should
have a 100 nF capacitor connected to AGND very close to the
REFIN/REFOUT pin. These connections are shown in Figure 18.
If the internal reference is required for use external to the ADC,
it should be buffered at the REFIN/REFOUT pin and a 100 nF
capacitor connected from this pin to AGND. The typical noise
performance for the internal reference with 5 V supplies is
150 nV/
√Hz @ 1 kHz and dc noise is 100 V p-p.
REFIN/REFOUT
AD7851
ANALOG
SUPPLY
5V
AVDD
DVDD
0.01 F
0.1 F
10 F
CREF1
CREF2
0.01 F
0.1 F
470nF
0.1 F
10
Figure 18. Relevant Connections When Using
Internal Reference
The other option is that the REFIN/REFOUT pin be overdriven
by connecting it to an external reference. This is possible due to
the series resistance from the REFIN/REFOUT pin to the internal
reference. This external reference can have a range that includes
AVDD. When using AVDD as the reference source, the 100 nF
capacitor from the REFIN/REFOUT pin to AGND should be as
close as possible to the REFIN/REFOUT pin, and also the CREF1
pin should be connected to AVDD to keep this pin at the same
level as the reference. The connections for this arrangement are
shown in Figure 19. When using AVDD it may be necessary to
add a resistor in series with the AVDD supply. This will have the
effect of filtering the noise associated with the AVDD supply.
REFIN/REFOUT
AD7851
ANALOG
SUPPLY
5V
AVDD
DVDD
0.01 F
0.1 F
10 F
CREF1
CREF2
0.01 F
470nF
0.1 F
10
Figure 19. Relevant Connections When Using AVDD
as the Reference
AD7851 PERFORMANCE CURVES
Figure 20 shows a typical FFT plot for the AD7851 at 333 kHz
sample rate and 10 kHz input frequency.
FREQUENCY (kHz)
0
–20
–120
0
100
20
SNR
(dB)
40
60
80
–40
–60
–80
–100
AVDD = DVDD = 5V
f
SAMPLE = 333kHz
f
IN = 10kHz
SNR = 79.5dB
THD = –95.2
Figure 20. FFT Plot
Figure 21 shows the SNR versus frequency for a 5 V supply and
a 4.096 external reference (5 V reference is typically 1 dB better
performance).
INPUT FREQUENCY (kHz)
79
75
0
166
20
50
120
140
78
77
76
S(N+D)
RATIO
(dB)
10
80
100
Figure 21. SNR vs. Frequency
Figure 22 shows the power supply rejection ratio versus fre-
quency for the part. The power supply rejection ratio is defined
as the ratio of the power in ADC output at frequency f to the
power of a full-scale sine wave.
PSRR (dB) = 10 log (Pf/Pfs)
Pf is the power at frequency f in ADC output, Pfs is the power
of a full-scale sine wave. Here a 100 mV peak-to-peak sine wave
is coupled onto the AVDD supply while the digital supply is left
unaltered.
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