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參數(shù)資料
| 型號(hào)： | AD7946BRMRL7 |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | ADC |
| 英文描述： | 14-Bit, 500 kSPS PulSAR⑩ ADC in MSOP/QFN |
| 中文描述： | 1-CH 14-BIT SUCCESSIVE APPROXIMATION ADC, SERIAL ACCESS, PDSO10 |
| 封裝： | MO-187-BA, MSOP-10 |
| 文件頁數(shù)： | 7/27頁 |
| 文件大?。?/td> | 301K |
| 代理商： | AD7946BRMRL7 |
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Preliminary Technical Data
AD7946
Rev Pr D | Page 15 of 27
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 in order 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 op amp
while preserving the same or better system performance.
The noise coming from the driver is filtered by the AD7946
analog input circuit 1-pole, low-pass filter made by R1 and
C2 or by the external filter, if one is used.
For ac applications, the driver needs to have a THD
performance suitable to that of the AD7946. Figure 12
gives the THD versus frequency that the driver should
exceed.
For multichannel multiplexed applications, the driver
amplifier and the AD7946 analog input circuit must be
able to settle for a full-scale step of 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
AD8021
Very low noise and high frequency
AD8022
Low noise and high frequency
OP184
Low power, low noise, and low frequency
AD8605, AD8615
5 V single-supply, low power
AD8519
Small, low power and low frequency
AD8031
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, e.g., a
reference buffer using the AD8031 or the AD8605, a 10 F
(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 F (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 F can be used with a minimal impact on performance,
especially DNL.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AD7946BRM-RL7 | 制造商:Analog Devices 功能描述:ADC Single SAR 500ksps 14-bit Serial 10-Pin MSOP T/R |
| AD7946BRMZ | 功能描述:IC ADC 14BIT 500KSPS SAR 10-MSOP RoHS:是 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - 模數(shù)轉(zhuǎn)換器 系列:PulSAR® 其它有關(guān)文件:TSA1204 View All Specifications 標(biāo)準(zhǔn)包裝:1 系列:- 位數(shù):12 采樣率（每秒）:20M 數(shù)據(jù)接口:并聯(lián) 轉(zhuǎn)換器數(shù)目:2 功率耗散（最大）:155mW 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:48-TQFP 供應(yīng)商設(shè)備封裝:48-TQFP（7x7） 包裝:Digi-Reel® 輸入數(shù)目和類型:4 個(gè)單端，單極；2 個(gè)差分，單極 產(chǎn)品目錄頁面:1156 (CN2011-ZH PDF) 其它名稱:497-5435-6 |
| AD7946BRMZRL7 | 功能描述:IC ADC 14BIT 500KSPS 10-MSOP RoHS:是 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - 模數(shù)轉(zhuǎn)換器 系列:PulSAR® 標(biāo)準(zhǔn)包裝:1,000 系列:- 位數(shù):12 采樣率（每秒）:300k 數(shù)據(jù)接口:并聯(lián) 轉(zhuǎn)換器數(shù)目:1 功率耗散（最大）:75mW 電壓電源:單電源 工作溫度:0°C ~ 70°C 安裝類型:表面貼裝 封裝/外殼:24-SOIC（0.295"，7.50mm 寬） 供應(yīng)商設(shè)備封裝:24-SOIC 包裝:帶卷 (TR) 輸入數(shù)目和類型:1 個(gè)單端，單極；1 個(gè)單端，雙極 |
| AD7947 | 制造商:AD 制造商全稱:Analog Devices 功能描述:3mW, 100kSPS, 14-Bit ADC in 6-Lead SOT-23 |
| AD7947BCP | 制造商:Analog Devices 功能描述:ADC SGL SAR 500KSPS 14BIT SERL 10LFCSP - Bulk |
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