- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄10680 > AD7949BCPZ (Analog Devices Inc)IC ADC 14BIT 250KSPS 8CH 20LFCSP PDF資料下載
參數(shù)資料
| 型號(hào)： | AD7949BCPZ |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 11/32頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC ADC 14BIT 250KSPS 8CH 20LFCSP |
| 產(chǎn)品培訓(xùn)模塊： | Power Line Monitoring |
| 產(chǎn)品變化通告： | Startup Circuitry Design Improvement Change 15/April/2009 |
| 標(biāo)準(zhǔn)包裝： | 1 |
| 系列： | PulSAR® |
| 位數(shù)： | 14 |
| 采樣率（每秒）： | 250k |
| 數(shù)據(jù)接口： | DSP，MICROWIRE?，QSPI?，串行，SPI? |
| 轉(zhuǎn)換器數(shù)目： | 1 |
| 功率耗散（最大）： | 15.5mW |
| 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： | 20-VFQFN 裸露焊盤，CSP |
| 供應(yīng)商設(shè)備封裝： | 20-LFCSP-VQ |
| 包裝： | 托盤 |
| 輸入數(shù)目和類型： | * |
| 產(chǎn)品目錄頁面： | 780 (CN2011-ZH PDF) |
第1頁第2頁第3頁第4頁第5頁第6頁第7頁第8頁第9頁第10頁當(dāng)前第11頁第12頁第13頁第14頁第15頁第16頁第17頁第18頁第19頁第20頁第21頁第22頁第23頁第24頁第25頁第26頁第27頁第28頁第29頁第30頁第31頁第32頁
Data Sheet
AD7949
Rev. D | Page 19 of 32
DRIVER AMPLIFIER CHOICE
Although the AD7949 is easy to drive, the driver amplifier must
meet the following requirements:
The noise generated by the driver amplifier must be kept as
low as possible to preserve the SNR and transition noise
performance of the AD7949. Note that the AD7949 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 from the
amplifier is filtered by the AD7949 analog input circuit
low-pass filter made by RIN and CIN or by an external filter,
if one is used.
For ac applications, the driver should have a THD perfor-
mance commensurate with the AD7949. Figure 17 shows
THD vs. frequency for the AD7949.
For multichannel, multiplexed applications on each input
or input pair, the driver amplifier and the AD7949 analog
input circuit must settle a full-scale step onto the capacitor
array at a 14-bit level (0.0015%). In amplifier data sheets,
settling at 0.1% to 0.01% is more commonly specified. This
may 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
5 V single supply, low noise
Very low noise and high frequency
Low noise and high frequency
Low power, low noise, and low frequency
5 V single supply, low power
VOLTAGE REFERENCE OUTPUT/INPUT
The AD7949 allows the choice of a very low temperature drift
internal voltage reference, an external reference, or an external
buffered reference.
The internal reference of the AD7949 provides excellent
performance and can be used in almost all applications. There
are six possible choices of voltage reference schemes briefly
described in Table 9, with more details in each of the following
sections.
Internal Reference/Temperature Sensor
The precision internal reference, suitable for most applications,
can be set for either a 2.5 V or a 4.096 V output, as detailed in
Table 9. With the internal reference enabled, the band gap
voltage is also present on the REFIN pin, which requires an
external 0.1 μF capacitor. Because the current output of REFIN
is limited, it can be used as a source if followed by a suitable
buffer, such as the AD8605. Note that the voltage of REFIN
changes depending on the 2.5 V or 4.096 V internal reference.
Enabling the reference also enables the internal temperature
sensor, which measures the internal temperature of the AD7949
and is thus useful for performing a system calibration. For
applications requiring the use of the temperature sensor, the
internal reference must be active (internal buffer can be
disabled in this case). Note that, when using the temperature
sensor, the output is straight binary referenced from the
AD7949 GND pin.
The internal reference is temperature-compensated to within
10 mV. The reference is trimmed to provide a typical drift of
±10 ppm/°C.
Connect the AD7949 as shown in Figure 30 for either a 2.5 V or
4.096 V internal reference.
REF
GND
TEMP
AD7949
10F
100nF
REFIN
0
73
51
-0
30
Figure 30. 2.5 V or 4.096 V Internal Reference Connection
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| 1676855-2 | CAP CER 0.56PF 100V 5% NP0 0603 |
| 1676855-1 | CAP CER 0.47PF 100V 5% NP0 0603 |
| 1676853-4 | CAP CER 0.82PF 25V 5% NP0 0603 |
| 1676853-3 | CAP CER 0.68PF 25V 5% NP0 0603 |
| VI-2NZ-MX-B1 | CONVERTER MOD DC/DC 2V 30W |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AD7949BCPZ | 制造商:Analog Devices 功能描述:IC ADC 14BIT 250KSPS LFCSP-20 |
| AD7949BCPZRL7 | 功能描述:IC ADC 14BIT 250KSPS 8CH 20LFCSP 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):16 采樣率（每秒）:45k 數(shù)據(jù)接口:串行 轉(zhuǎn)換器數(shù)目:2 功率耗散（最大）:315mW 電壓電源:模擬和數(shù)字 工作溫度:0°C ~ 70°C 安裝類型:表面貼裝 封裝/外殼:28-SOIC（0.295"，7.50mm 寬） 供應(yīng)商設(shè)備封裝:28-SOIC W 包裝:帶卷 (TR) 輸入數(shù)目和類型:2 個(gè)單端，單極 |
| AD7949SCPZ-EP-R2 | 功能描述:14 Bit Analog to Digital Converter 8 Input 1 SAR 20-LFCSP-WQ (4x4) 制造商:analog devices inc. 系列:PulSAR? 包裝:剪切帶（CT） 零件狀態(tài):有效 位數(shù):14 采樣率（每秒）:256k 輸入數(shù):8 輸入類型:差分，單端 數(shù)據(jù)接口:SPI，DSP 配置:MUX-ADC 無線電 - S/H:ADC:- A/D 轉(zhuǎn)換器數(shù):1 架構(gòu):SAR 參考類型:外部， 內(nèi)部 電壓 - 電源，模擬:2.3 V ~ 5.5 V 電壓 - 電源，數(shù)字:2.3 V ~ 5.5 V 特性:溫度傳感器 工作溫度:-55°C ~ 125°C 封裝/外殼:20-WFQFN 裸露焊盤，CSP 供應(yīng)商器件封裝:20-LFCSP-WQ（4x4） 標(biāo)準(zhǔn)包裝:1 |
| AD7949SCPZ-EP-RL7 | 制造商:Analog Devices 功能描述:ADC Single SAR 250ksps 14-bit Serial 20-Pin LFCSP EP T/R 制造商:Analog Devices 功能描述:8 CH 250KSPS 14BIT ADC IC - Tape and Reel 制造商:Analog Devices 功能描述:IC ADC 14BIT 8CH 250KSPS 20LFCSP 制造商:Analog Devices 功能描述:Analog to Digital Converters - ADC 14-Bit 8CH 250 kSPS 制造商:Analog Devices 功能描述:CONVERTER - ADC |
| AD795 | 制造商:AD 制造商全稱:Analog Devices 功能描述:Low Power, Low Noise Precision FET Op Amp |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。