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參數(shù)資料
| 型號： | AD7853ARSZ-REEL7 |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 9/34頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC ADC 12BIT SRL 200KSPS 24SSOP |
| 產(chǎn)品變化通告： | Product Discontinuance 27/Oct/2011 |
| 標(biāo)準(zhǔn)包裝： | 500 |
| 位數(shù)： | 12 |
| 采樣率（每秒）： | 200k |
| 數(shù)據(jù)接口： | 8051，QSPI?，串行，SPI? µP |
| 轉(zhuǎn)換器數(shù)目： | 2 |
| 功率耗散（最大）： | 33mW |
| 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： | 24-SSOP（0.209"，5.30mm 寬） |
| 供應(yīng)商設(shè)備封裝： | 24-SSOP |
| 包裝： | 帶卷 (TR) |
| 輸入數(shù)目和類型： | 1 個偽差分，單極；1 個偽差分，雙極 |
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REV. B
–17–
AD7853/AD7853L
REFERENCE SECTION
For specified performance, it is recommended that when using
an external reference this reference should be between 2.3 V
and the analog supply AVDD. The connections for the relevant
reference 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
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.
AVDD
DVDD
CREF1
CREF2
REFIN/REFOUT
ANALOG SUPPLY
+3V TO +5V
0.1 F
10 F
0.1 F
0.01 F
0.1 F
AD7853/AD7853L
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.
AVDD
DVDD
CREF1
CREF2
REFIN/REFOUT
ANALOG SUPPLY
+3V TO +5V
0.1 F
10 F
0.1 F
0.01 F
0.1 F
AD7853/AD7853L
Figure 19. Relevant Connections When Using AVDD as the
Reference
PERFORMANCE CURVES
Figure 20 shows a typical FFT plot for the AD7853 at 200 kHz
sample rate and 10 kHz input frequency.
0
–120
–60
–100
20
–80
0
–20
–40
80
60
40
AVDD = DVDD = 3.3V
fSAMPLE = 200kHz
fIN = 10kHz
SNR = 72.04dB
THD = –88.43dB
FREQUENCY – kHz
100
SNR
–
dB
Figure 20. FFT Plot
Figure 21 shows the SNR versus Frequency for different sup-
plies and different external references.
INPUT FREQUENCY – kHz
74
73
69
0
100
S(N+D)
RATIO
–
dB
20
40
60
80
72
71
70
5.0V SUPPLIES, WITH 5V REFERENCE
5.0V SUPPLIES
5.0V SUPPLIES, L VERSION
3.3V SUPPLIES
AVDD = DVDD WITH 2.5V REFERENCE
UNLESS STATED OTHERWISE
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 de-
fined 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 = Power at frequency f in ADC output, Pfs = 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. Both the 3.3 V and 5.0 V supply performances are
shown.
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