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參數(shù)資料
| 型號： | EVAL-AD7329CBZ |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 17/41頁 |
| 文件大?。?/td> | 0K |
| 描述： | BOARD EVALUATION FOR AD7329CBZ |
| 標(biāo)準(zhǔn)包裝： | 1 |
| 系列： | iCMOS® |
| ADC 的數(shù)量： | 1 |
| 位數(shù)： | 12 |
| 采樣率（每秒）： | 1M |
| 數(shù)據(jù)接口： | 串行 |
| 輸入范圍： | ±10 V |
| 在以下條件下的電源（標(biāo)準(zhǔn)）： | 30mW @ 1MSPS |
| 工作溫度： | -40°C ~ 85°C |
| 已用 IC / 零件： | AD7329 |
| 已供物品： | 板 |
| 相關(guān)產(chǎn)品： | AD7329BRUZ-REEL7-ND - IC ADC 12BIT+SAR 8CHAN 24-TSSOP AD7329BRUZ-REEL-ND - IC ADC 12BIT+SAR 8CHAN 24-TSSOP AD7329BRUZ-ND - IC ADC 12BIT 8CH MUX SPI 24TSSOP |
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Data Sheet
AD7329
Rev. B | Page 23 of 40
DRIVER AMPLIFIER CHOICE
In applications where the harmonic distortion and signal-to-
noise ratio are critical specifications, the analog input of the
AD7329 should be driven from a low impedance source. Large
source impedances significantly affect the ac performance of the
ADC and can necessitate the use of an input buffer amplifier.
When no amplifier is used to drive the analog input, the source
impedance should be limited to low values. The maximum source
impedance depends on the amount of THD that can be tolerated
in the application. The THD increases as the source impedance
increases and performance degrades. Figure 21 and Figure 22
show graphs of the THD vs. the analog input frequency for
various source impedances. Depending on the input range and
analog input configuration selected, the AD7329 can handle
source impedances of up to 4 k before the THD starts to
degrade.
Due to the programmable nature of the analog inputs on the
AD7329, the choice of op amp used to drive the inputs is a
function of the particular application and depends on the input
configuration and the analog input voltage ranges selected.
The driver amplifier must be able to settle for a full-scale step to
a 13-bit level, within 0.0122%, in less than the specified acquisition
time of the AD7329. An op amp such as the AD8021 meets this
requirement when operating in single-ended mode. The AD8021
needs an external compensating NPO type of capacitor. The
AD8022 can also be used in high frequency applications where
a dual version is required. For lower frequency applications, op
the AD7329 in single-ended mode configuration.
Table 8. Typical AC Performance Using Different Op Amps
in Single-Ended Mode, ±10 V Input Range
Parameter
No Buffer
SNR (dB)
74.24
74.03
73.78
73.88
SNRD (dB)
72.42
74.88
72.11
71.98
THD (dB)
77.05
75.95
77.04
76.47
Table 9. Typical AC Performance Using Different Op Amps
in Differential Mode, ±10 V Input Range
Parameter
No Buffer
SNR (dB)
77.16
76.81
76.95
76.76
SNRD (dB)
76.50
76.02
76.78
75.89
THD (dB)
84.91
83.74
90.55
83.24
Differential operation requires that VIN+ and VIN be simulta-
neously driven with two signals of equal amplitude that are 180°
out of phase. The common mode must be set up externally to the
REFOUT voltage, the VCC supply voltage, and the particular amplifier
used to drive the analog inputs. Differential mode with either an ac
input or a dc input provides the best THD performance over a
wide frequency range. Because not all applications have a signal
preconditioned for differential operation, there is often a need
to perform a single-ended-to-differential conversion.
This single-ended-to-differential conversion can be performed
using an op amp pair. Typical connection diagrams for an op
amp pair are shown in Figure 45 and Figure 46. In Figure 45,
the common-mode signal is applied to the noninverting input
of the second amplifier.
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