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參數(shù)資料
| 型號： | AD7863ARZ-3 |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 13/24頁 |
| 文件大小： | 0K |
| 描述： | IC ADC 14BIT DUAL 2CHAN 28-SOIC |
| 產(chǎn)品培訓(xùn)模塊： | Power Line Monitoring |
| 標(biāo)準(zhǔn)包裝： | 27 |
| 位數(shù)： | 14 |
| 采樣率（每秒）： | 175k |
| 數(shù)據(jù)接口： | 并聯(lián) |
| 轉(zhuǎn)換器數(shù)目： | 2 |
| 功率耗散（最大）： | 94.5mW |
| 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： | 28-SOIC（0.295"，7.50mm 寬） |
| 供應(yīng)商設(shè)備封裝： | 28-SOIC W |
| 包裝： | 管件 |
| 輸入數(shù)目和類型： | 4 個(gè)單端，單極；4 個(gè)單端，雙極 |
| 產(chǎn)品目錄頁面： | 779 (CN2011-ZH PDF) |
AD7863
Rev. B | Page 20 of 24
APPLICATIONS HINTS
PC BOARD LAYOUT CONSIDERATIONS
The AD7863 is optimally designed for lowest noise performance,
both radiated and conducted noise. To complement the
excellent noise performance of the AD7863 it is imperative that
great care be given to the PC board layout. Figure 26 shows a
recommended connection diagram for the AD7863.
GROUND PLANES
The AD7863 and associated analog circuitry should have a
separate ground plane, referred to as the analog ground plane
(AGND). This analog ground plane should encompass all
AD7863 ground pins (including the DGND pin), voltage
reference circuitry, power supply bypass circuitry, the analog
input traces, and any associated input/buffer amplifiers.
The regular PCB ground plane (referred to as the DGND for
this discussion) area should encompass all digital signal traces,
excluding the ground pins, leading up to the AD7863.
POWER PLANES
The PC board layout should have two distinct power planes,
one for analog circuitry and one for digital circuitry. The analog
power plane should encompass the AD7863 (VDD) and all
associated analog circuitry. This power plane should be
connected to the regular PCB power plane (VCC) at a single
point, if necessary through a ferrite bead, as illustrated in
Figure 26. This bead (part numbers for reference:
Fair-Rite 274300111 or Murata BL01/02/03) should be located
within three inches of the AD7863.
The PCB power plane (VCC) should provide power to all digital
logic on the PC board, and the analog power plane (VDD) should
provide power to all AD7863 power pins, voltage reference
circuitry and any input amplifiers, if needed. A suitable low
noise amplifier for the AD7863 is the AD797, one for each
input. Ensure that the +VS and the VS supplies to each
amplifier are individually decoupled to AGND.
The PCB power (VCC) and ground (DGND) should not overlay
portions of the analog power plane (VDD). Keeping the VCC
power and the DGND planes from overlaying the VDD contributes
to a reduction in plane-to-plane noise coupling.
SUPPLY DECOUPLING
Noise on the analog power plane (VDD) can be further reduced
by use of multiple decoupling capacitors (Figure 26).
Optimum performance is achieved by the use of disc ceramic
capacitors. The VDD and reference pins (whether using an
external or an internal reference) should be individually
decoupled to the analog ground plane (AGND). This should be
done by placing the capacitors as close as possible to the
AD7863 pins with the capacitor leads as short as possible, thus
minimizing lead inductance.
AD7863
AGND
DGND
AGND
AD780
L
(FERRITE BEAD)
TEMP
+15V
VA1
VB1
VA2
VB2
VA1
VREF
VIN
VOUT
VDD
VB1
VA2
VB2
0.1F
10F
47F
ANALOG
SUPPLY
+5V
ANALOG
SUPPLY
–15V
0.1F
–VS
4 × AD797s
+VS
0.1F
06
41
1-
0
26
Figure 26. Typical Connections Diagram Including the Relevant Decoupling
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| AD7863ARZ-31 | 制造商:AD 制造商全稱:Analog Devices 功能描述:Simultaneous Sampling Dual 175 kSPS 14-Bit ADC |
| AD7863BR-10 | 功能描述:IC ADC 14BIT DUAL 2CH 28-SOIC RoHS:否 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 系列:- 位數(shù):14 采樣率（每秒）:83k 數(shù)據(jù)接口:串行，并聯(lián) 轉(zhuǎn)換器數(shù)目:1 功率耗散（最大）:95mW 電壓電源:雙 ± 工作溫度:0°C ~ 70°C 安裝類型:通孔 封裝/外殼:28-DIP（0.600"，15.24mm） 供應(yīng)商設(shè)備封裝:28-PDIP 包裝:管件 輸入數(shù)目和類型:1 個(gè)單端，雙極 |
| AD7863BR-10REEL | 制造商:Analog Devices 功能描述:ADC Dual SAR 175ksps 14-bit Parallel 28-Pin SOIC W T/R 制造商:Rochester Electronics LLC 功能描述:2 CH.SIMULTANEOUS SAMPL.14-B DUAL ADC IC - Tape and Reel |
| AD7863BR-10REEL7 | 制造商:Analog Devices 功能描述:ADC Dual SAR 175ksps 14-bit Parallel 28-Pin SOIC W T/R |
| AD7863BR-3 | 功能描述:IC ADC 14BIT DUAL 2CH 28-SOIC RoHS:否 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 系列:- 位數(shù):14 采樣率（每秒）:83k 數(shù)據(jù)接口:串行，并聯(lián) 轉(zhuǎn)換器數(shù)目:1 功率耗散（最大）:95mW 電壓電源:雙 ± 工作溫度:0°C ~ 70°C 安裝類型:通孔 封裝/外殼:28-DIP（0.600"，15.24mm） 供應(yīng)商設(shè)備封裝:28-PDIP 包裝:管件 輸入數(shù)目和類型:1 個(gè)單端，雙極 |
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