with a sup" />
參數(shù)資料
型號(hào)： EVAL-AD7762EDZ
廠商： Analog Devices Inc
文件頁數(shù)： 9/29頁
文件大?。?/td> 0K
描述： BOARD EVAL CONTROL AD7762
標(biāo)準(zhǔn)包裝： 1
ADC 的數(shù)量： 1
位數(shù)： 24
采樣率（每秒）： 625k
數(shù)據(jù)接口： 并聯(lián)
輸入范圍： ±3.25 Vpp
在以下條件下的電源（標(biāo)準(zhǔn)）： 958mW @ 625kSPS
工作溫度： -40°C ~ 85°C
已用 IC / 零件： AD7762
已供物品： 板，CD
AD7762
Data Sheet
Rev. A | Page 16 of 28
DRIVING THE AD7762
The AD7762 has an on-chip differential amplifier that operates
with a supply voltage (AVDD3) from 3.15 V to 5.25 V. For a
4.096 V reference, the supply voltage must be 5 V.
To achieve the specified performance in normal mode, the
differential amplifier should be configured as a first-order
antialias filter, as shown in Figure 25. Any additional filtering
should be carried out in previous stages using low noise, high
performance op amps, such as the AD8021.
Suitable component values for the first-order filter are listed in
Table 8. The values in Table 8 yield a 10 dB attenuation at the
first alias point of 19 MHz.
04975-040
A1
RIN
RFB
CFB
RIN
RM
CS
RFB
CFB
VIN–
A
B
VIN+
Figure 25. Differential Amplifier Configuration
Table 8. Normal Mode Component Values
VREF
RIN
RFB
RM
CS
CFB
4.096 V
1 kΩ
655 Ω
18 Ω
5.6 pF
33 pF
Figure 26 shows the signal conditioning that occurs using the
circuit in Figure 25 with a ±2.5 V input signal biased around
ground and having the component values and conditions in
Table 8. The differential amplifier always biases the output
signal to sit on the optimum common mode of VREF/2, in this
case 2.048 V. The signal is also scaled to give the maximum
allowable voltage swing with this reference value. This is
calculated as 80% of VREF, that is, 0.8 × 4.096 V
≈ 3.275 V p-p
on each input.
To obtain maximum performance from the AD7762, it is
advisable to drive the ADC with differential signals. Figure 27
shows how a bipolar, single-ended signal biased around ground
can drive the AD7762 with the use of an external op amp, such
as the AD8021.
With a 4.096 V reference, a 5 V supply must be provided to the
reference buffer (AVDD4). With a 2.5 V reference, a 3.3 V supply
must be provided to AVDD4.
04975-041
+2.5V
0V
–2.5V
+2.5V
0V
–2.5V
+3.685V
+2.048V
+0.410V
+3.685V
+2.048V
+0.410V
A
VIN+
VIN–
B
Figure 26. Differential Amplifier Signal Conditioning
04975-042
A1
RIN
RFB
CFB
RIN
RM
CS
RFB
CFB
VIN–
VIN
VIN+
AD8021
2R
R
Figure 27. Single-Ended-to-Differential Conversion
05477-043
CS2
CPB2
SS4
SH4
CPA
SS2
SH2
CS1
CPB1
SS3
SH3
SS1
SH1
ANALOG
MODULATOR
VIN+
Figure 28. Equivalent Input Circuit
The AD7762 employs a double sampling front end, as shown in
Figure 28. For simplicity, only the equivalent input circuit for VIN+
is shown. The equivalent input circuitry for VIN is the same.
相關(guān)PDF資料
PDF描述
EEM24DRST CONN EDGECARD 48POS DIP .156 SLD
EVAL-AD7191EBZ BOARD EVAL FOR AD7191
MIC2562A-1YM IC CTRLR PCMCIA CARDBUS 14SOIC
MIC2027-2YWM IC USB DISTRIB SW QUAD 16-SOIC
MIC2027-2YM IC USB DISTRIB SW QUAD 16-SOIC
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
EVAL-AD7763EB 制造商:Analog Devices 功能描述:EVALUATION BOARD I.C. - Bulk
EVAL-AD7763EBZ 制造商:Analog Devices 功能描述:EVALUATION BOARD I.C. - Bulk
EVAL-AD7763EDZ 功能描述:BOARD EVAL CONTROL AD7763 RoHS:是 類別:編程器，開發(fā)系統(tǒng) >> 評(píng)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-AD7764EBZ 制造商:Analog Devices 功能描述:EVAL BD FOR AD7764 - Bulk
EVAL-AD7764EDZ 功能描述:BOARD EVAL AD7764 RoHS:是 類別:編程器，開發(fā)系統(tǒng) >> 評(píng)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
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。

采購需求

(若只采購一條型號(hào)，填寫一行即可)

發(fā)布成功！您可以繼續(xù)發(fā)布采購。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

發(fā)布成功！您可以繼續(xù)發(fā)布采購。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

*型號(hào) *數(shù)量 廠商 批號(hào) 封裝
添加更多采購

我的聯(lián)系方式

*
*
*