- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄10301 > AD7707BRUZ-REEL (Analog Devices Inc)IC ADC 16BIT 3CH 20-TSSOP PDF資料下載
參數(shù)資料
| 型號(hào)： | AD7707BRUZ-REEL |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 22/52頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC ADC 16BIT 3CH 20-TSSOP |
| 標(biāo)準(zhǔn)包裝： | 2,500 |
| 位數(shù)： | 16 |
| 采樣率（每秒）： | 500 |
| 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）： | 1mW |
| 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： | 20-TSSOP（0.173"，4.40mm 寬） |
| 供應(yīng)商設(shè)備封裝： | 20-TSSOP |
| 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；2 個(gè)偽差分，單極；2 個(gè)偽差分，雙極 |
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頁當(dāng)前第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頁第33頁第34頁第35頁第36頁第37頁第38頁第39頁第40頁第41頁第42頁第43頁第44頁第45頁第46頁第47頁第48頁第49頁第50頁第51頁第52頁
AD7707
Rev. B | Page 29 of 52
POSTFILTERING
The on-chip modulator provides samples at a 19.2 kHz output
rate with fCLKIN at 2.4576 MHz. The on-chip digital filter decimates
these samples to provide data at an output rate that corresponds
to the programmed output rate of the filter. Because the output
data rate is higher than the Nyquist criterion, the output rate for
a given bandwidth satisfies most application requirements. There
may, however, be some applications that require a higher data
rate for a given bandwidth and noise performance. Applications
that need this higher data rate require some postfiltering follow-
ing the digital filter of the AD7707.
For example, if the required bandwidth is 7.86 Hz, but the
required update rate is 100 Hz, the data can be taken from the
AD7707 at the 100 Hz rate, giving a 3 dB bandwidth of 26.2 Hz.
Postfiltering can be applied to this to reduce the bandwidth and
output noise, to the 7.86 Hz bandwidth level, while maintaining
an output rate of 100 Hz.
Postfiltering can also be used to reduce the output noise from
the device for bandwidths below 2.62 Hz. At a gain of 128 and a
bandwidth of 2.62 Hz, the output rms noise is 450 nV. This is
essentially device noise or white noise and because the input is
chopped, the noise has a primarily flat frequency response.
By reducing the bandwidth below 2.62 Hz, the noise in the
resultant pass band can be reduced. A reduction in bandwidth
by a factor of 2 results in a reduction of approximately 1.25 in
the output rms noise. This additional filtering results in a longer
settling time.
ANALOG FILTERING
The digital filter does not provide any rejection at integer multiples
of the modulator sample frequency, as previously outlined.
However, due to the AD7707’s high oversampling ratio, these bands
occupy only a small fraction of the spectrum and most broadband
noise is filtered. This means that the analog filtering requirements
in front of the AD7707 are considerably reduced vs. a conven-
tional converter with no on-chip filtering. In addition, because
the part’s common-mode rejection performance of 100 dB
extends out to several kHz, common-mode noise in this
frequency range is substantially reduced.
Depending on the application, however, it may be necessary to
provide attenuation prior to the AD7707 to eliminate unwanted
frequencies from these bands, which the digital filter will pass.
It may also be necessary in some applications to provide analog
filtering in front of the AD7707 to ensure that differential noise
signals outside the band of interest do not saturate the analog
modulator.
If passive components are placed in front of the AD7707 in
unbuffered mode, care must be taken to ensure that the source
impedance is low enough not to introduce gain errors in the
system. This significantly limits the amount of passive antialiasing
filtering, which can be provided in front of the AD7707 when it
is used in unbuffered mode. However, when the part is used in
buffered mode, large source impedances simply result in a small
dc offset error (a 10 kΩ source resistance causes an offset error
of less than 10 μV). Therefore, if the system requires any
cant source impedances to provide passive analog
front of the AD7707, it is recommended that the
in buffered mode.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| VE-26L-CU-S | CONVERTER MOD DC/DC 28V 200W |
| D38999/20FJ29AN | CONN HSG RCPT 29POS WALL MT PINS |
| AD7706BRU-REEL7 | IC ADC 16BIT 3CH 16-TSSOP T/R |
| MS27473T14F97P | CONN PLUG 12POS STRAIGHT W/PINS |
| D38999/20WG75PALC | CONN HSG RCPT 4POS WALL MT PINS |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AD7707BRUZ-REEL7 | 功能描述:IC ADC 16BIT 3CHAN 20TSSOP RoHS:是 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - 模數(shù)轉(zhuǎn)換器 系列:- 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 |
| AD7707BRZ | 功能描述:IC ADC 16BIT 3CHAN 20SOIC RoHS:是 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - 模數(shù)轉(zhuǎn)換器 系列:- 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 |
| AD7707BRZ-REEL | 功能描述:IC ADC 16BIT 3CHAN 20SOIC RoHS:是 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - 模數(shù)轉(zhuǎn)換器 系列:- 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 |
| AD7707BRZ-REEL7 | 功能描述:IC ADC 16BIT 3CHAN 20SOIC RoHS:是 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - 模數(shù)轉(zhuǎn)換器 系列:- 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 |
| AD7707EB | 制造商:AD 制造商全稱:Analog Devices 功能描述:3 V/5 V 610 V Input Range 1 mW 3-Channel 16-Bit Sigma-Delta ADC(316.51 k) |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。