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參數(shù)資料
| 型號： | EVAL-AD7794EBZ |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 20/37頁 |
| 文件大?。?/td> | 0K |
| 描述： | BOARD EVALUATION FOR AD7794 |
| 產(chǎn)品培訓(xùn)模塊： | ADC Applications ADC Architectures ADC DC/AC Performance |
| 標(biāo)準(zhǔn)包裝： | 1 |
| ADC 的數(shù)量： | 1 |
| 位數(shù)： | 24 |
| 采樣率（每秒）： | 470 |
| 數(shù)據(jù)接口： | SPI?、QSPI?、MICROWIRE? 和 DSP |
| 輸入范圍： | ±VREF/增益 |
| 在以下條件下的電源（標(biāo)準(zhǔn)）： | 2.5mW @ 470SPS |
| 工作溫度： | -40°C ~ 105°C |
| 已用 IC / 零件： | AD7794 |
| 已供物品： | 板，纜線，CD |
| 相關(guān)產(chǎn)品： | AD7794CRUZ-REEL-ND - IC ADC 24BIT 6CH LP 24-TSSOP AD7794CRUZ-ND - IC ADC 24BIT 6CH LP 24-TSSOP AD7794BRU-ND - IC ADC 24BIT 6CH LP 24-TSSOP AD7794BRUZ-REEL-ND - IC ADC 24BIT 6CH LP 24-TSSOP AD7794BRU-REEL-ND - IC ADC 24BIT 6CH LP 24-TSSOP AD7794BRUZ-ND - IC ADC 24BIT SIG-DEL 6CH 24TSSOP |
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AD7794/AD7795
Rev. D | Page 26 of 36
ADC CIRCUIT INFORMATION
OVERVIEW
The AD7794/AD7795 are low power ADCs that incorporate a
∑-Δ modulator, buffer, reference, in-amp, and on-chip digital
filtering, which are intended for the measurement of wide
dynamic range, low frequency signals (such as those in pressure
transducers), weigh scales, and temperature measurement
applications.
Each part has six differential inputs that can be buffered or
unbuffered. The devices operate with an internal 1.17 V refer-
ence or by using an external reference. Figure 12 shows the
basic connections required to operate the parts.
The output rate of the AD7794/AD7795 (fADC) is user pro-
grammable. The allowable update rates, along with the
corresponding settling times, are listed in Table 19 for chop
enabled. With chop disabled, the allowable update rates remain
unchanged, but the settling time equals 1/fADC. Normal mode
rejection is the major function of the digital filter. Simultaneous
50 Hz and 60 Hz rejection is optimized when the update rate
equals 16.7 Hz or less, as notches are placed at both 50 Hz and
60 Hz with these update rates (see Figure 14).
The AD7794/AD7795 use slightly different filter types,
depending on the output update rate, so that the rejection of
quantization noise and device noise is optimized. When the
update rate is 4.17 Hz to 12.5 Hz, a Sinc3 filter along with an
averaging filter is used. When the update rate is 16.7 Hz to
39 Hz, a modified Sinc3 filter is used. This filter gives
simultaneous 50 Hz/60 Hz rejection when the update rate
equals 16.7 Hz. A Sinc4 filter is used when the update rate is
50 Hz to 242 Hz. Finally, an integrate-only filter is used when
the update rate equals 470 Hz. Figure 13 to Figure 16 show the
frequency response of the different filter types for some of the
update rates when chop is enabled. In this mode, the settling
time equals twice the update rate. Figure 17 to Figure 20 show
the filter response with chop disabled.
04
85
4-
0
12
DOUT/RDY
DIN
SCLK
CS
DVDD
SERIAL
INTERFACE
AND
LOGIC
CONTROL
Σ-Δ
ADC
AD7794/AD7795
AIN1(+)
REFIN1(+)
AIN1(–)
AIN2(+)
AIN2(–)
AIN3(+)
AIN3(–)
REFIN2(+)
IOUT1
REFIN1(–)
IN-AMP
VDD
GND
MUX
PSW
GND
INTERNAL
CLOCK
CLK
GND
AVDD
VDD
IN+
IN–
OUT–
OUT+
IN+
IN–
OUT–
OUT+
RCM
VDD
REFIN2(–)
BUF
Figure 12. Basic Connection Diagram
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| EVAL-AD7795 | 制造商:AD 制造商全稱:Analog Devices 功能描述:Evaluation Board for the AD7795 16-Bit, Low Power Sigma-Delta ADC (6 Channels) |
| EVAL-AD7795EB | 制造商:Analog Devices 功能描述:EVAL BD LOW PWR, 16BIT BFFRED SIGMA-DELTA ADC - Bulk |
| EVAL-AD7795EBZ | 功能描述:BOARD EVAL FOR AD7795 RoHS:是 類別:編程器，開發(fā)系統(tǒng) >> 評估板 - 模數(shù)轉(zhuǎn)換器 (ADC) 系列:- 產(chǎn)品培訓(xùn)模塊:Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:1 系列:- ADC 的數(shù)量:1 位數(shù):12 采樣率（每秒）:94.4k 數(shù)據(jù)接口:USB 輸入范圍:±VREF/2 在以下條件下的電源（標(biāo)準(zhǔn)）:- 工作溫度:-40°C ~ 85°C 已用 IC / 零件:MAX11645 已供物品:板，軟件 |
| EVAL-AD7796EB | 制造商:AD 制造商全稱:Analog Devices 功能描述:Low Power, 16-/24-Bit Sigma-Delta ADC for Bridge Sensors |
| EVAL-AD7796EBZ | 功能描述:BOARD EVALUATION FOR AD7796 RoHS:是 類別:編程器，開發(fā)系統(tǒng) >> 評估板 - 模數(shù)轉(zhuǎn)換器 (ADC) 系列:- 產(chǎn)品培訓(xùn)模塊:Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:1 系列:- ADC 的數(shù)量:1 位數(shù):12 采樣率（每秒）:94.4k 數(shù)據(jù)接口:USB 輸入范圍:±VREF/2 在以下條件下的電源（標(biāo)準(zhǔn)）:- 工作溫度:-40°C ~ 85°C 已用 IC / 零件:MAX11645 已供物品:板，軟件 |
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