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參數資料
| 型號： | AD7946BRMZRL7 |
| 廠商： | Analog Devices Inc |
| 文件頁數： | 6/24頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC ADC 14BIT 500KSPS 10-MSOP |
| 標準包裝： | 1,000 |
| 系列： | PulSAR® |
| 位數： | 14 |
| 采樣率（每秒）： | 500k |
| 數據接口： | DSP，MICROWIRE?，QSPI?，串行，SPI? |
| 轉換器數目： | 1 |
| 功率耗散（最大）： | 19mW |
| 電壓電源： | 單電源 |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 10-TFSOP，10-MSOP（0.118"，3.00mm 寬） |
| 供應商設備封裝： | 10-MSOP |
| 包裝： | 帶卷 (TR) |
| 輸入數目和類型： | 1 個偽差分，單極 |
| 配用： | EVAL-AD7946CBZ-ND - BOARD EVALUATION FOR AD7946 |
AD7946
Rev. A | Page 14 of 24
tolerated. The THD degrades as a function of the source
impedance and the maximum input frequency, as shown in
FREQUENCY (kHz)
TH
D
(
dB
)
04
65
6-
02
8
–105
–110
–100
–90
–95
–85
–80
0
255075
100
RS = 33
RS = 50
RS =100
RS = 250
Figure 28. THD vs. Analog Input Frequency and Source Resistance
DRIVER AMPLIFIER CHOICE
Although the AD7946 is easy to drive, the driver amplifier
needs to meet the following requirements:
The noise generated by the driver amplifier needs to be
kept as low as possible to preserve the SNR and transition
noise performance of the AD7946. Note that the AD7946
has a noise much lower than most of the other 14-bit
ADCs and, therefore, can be driven by a noisier amplifier
to meet a given system noise specification. The noise
coming from the amplifier is filtered by the AD7946 analog
input circuit 1-pole, low-pass filter made by RIN and CIN or
by the external filter, if one is used.
For ac applications, the driver should have a THD perform-
ance commensurate with the AD7946. Figure 17 shows the
THD vs. frequency that the driver should exceed.
For multichannel multiplexed applications, the driver
amplifier and the AD7946 analog input circuit must settle a
full-scale step onto the capacitor array at a 14-bit level
(0.006%). In the amplifier’s data sheet, settling at 0.1% to
0.01% is more commonly specified. This could differ
significantly from the settling time at a 14-bit level and
should be verified prior to driver selection.
Table 8. Recommended Driver Amplifiers
Amplifier
Typical Application
Very low noise, small and low power
Very low noise and high frequency
5 V single-supply, low noise, and low power
Low noise and high frequency
Low power, low noise, and low frequency
5 V single-supply, low power
Small, low power, and low frequency
High frequency and low power
VOLTAGE REFERENCE INPUT
The AD7946 voltage reference input REF has a dynamic input
impedance and should therefore be driven by a low impedance
source with efficient decoupling between the REF and GND
pins, as explained in the Layout section.
When REF is driven by a very low impedance source, for
10 μF (X5R, 0805 size) ceramic chip capacitor is appropriate for
optimum performance.
If an unbuffered reference voltage is used, the decoupling value
depends on the reference used. For instance, a 22 μF (X5R,
1206 size) ceramic chip capacitor is appropriate for optimum
performance using a low temperature drift ADR43x reference.
If desired, smaller reference decoupling capacitor values down
to 2.2 μF can be used with a minimal impact on performance,
especially DNL.
Regardless, there is no need for an additional lower value ceramic
decoupling capacitor (for example, 100 nF) between the REF
and GND pins.
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相關代理商/技術參數 |
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|---|---|
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| AD7948ANZ-B | 功能描述:IC DAC 12BIT MULT PARALL 20DIP RoHS:是 類別:集成電路 (IC) >> 數據采集 - 數模轉換器 系列:- 標準包裝:2,400 系列:- 設置時間:- 位數:18 數據接口:串行 轉換器數目:3 電壓電源:模擬和數字 功率耗散（最大）:- 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:36-TFBGA 供應商設備封裝:36-TFBGA 包裝:帶卷 (TR) 輸出數目和類型:* 采樣率（每秒）:* |
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