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參數(shù)資料
| 型號(hào)： | AD7835ASZ-REEL |
| 廠商： | Analog Devices Inc |
| 文件頁(yè)數(shù)： | 17/28頁(yè) |
| 文件大?。?/td> | 0K |
| 描述： | IC DAC 14BIT QUAD PARA 44-MQFP |
| 產(chǎn)品培訓(xùn)模塊： | Data Converter Fundamentals DAC Architectures |
| 標(biāo)準(zhǔn)包裝： | 800 |
| 設(shè)置時(shí)間： | 10µs |
| 位數(shù)： | 14 |
| 數(shù)據(jù)接口： | 并聯(lián) |
| 轉(zhuǎn)換器數(shù)目： | 4 |
| 電壓電源： | 模擬和數(shù)字，雙 ± |
| 功率耗散（最大）： | 465mW |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 44-QFP |
| 供應(yīng)商設(shè)備封裝： | 44-MQFP（10x10） |
| 包裝： | 帶卷 (TR) |
| 輸出數(shù)目和類型： | 4 電壓，單極；4 電壓，雙極 |
| 采樣率（每秒）： | 100k |
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AD7834/AD7835
Rev. D | Page 24 of 28
4
6
8
13
7
3
1
15
14
9
16
2
10 11 12
1F
+15V –15V
0.1F
AD588
4
6
8
13
7
3
1
15
14
16
2
10
11
12
1F
+15V –15V
AD588
9
DUT
GND
TO TESTER
WINDOW
COMPARATOR
–15V
+15V
VREF(+)A
VREF(–)A
DSG A
VREF(+)B
VREF(–)B
AD78351
VOUT1
VOUT2
VOUT3
VOUT4
DSG B
AGND
DUT
GND
DUT
GND
VDUT
VOFFSET
PIN
DRIVER
01006
-035
1ADDITIONAL PINS OMITTED FOR CLARITY
If the AD7834/AD7835 are the only devices requiring an AGND
to DGND connection, then the ground planes should be connected
at the AGND and DGND pins of the AD7834/ AD7835. If the
AD7834/AD7835 are in a system where multiple devices require
an AGND to DGND connection, the connection can still be made
at one point only, a star ground point, which can be established as
close as possible to the AD7834/AD7835.
Digital lines running under the device must be avoided because
they couple noise onto the die. The analog ground plane can run
under the AD7834/AD7835 to avoid noise coupling. The power
supply lines of the AD7834/AD7835 can use as large a trace as
possible to provide low impedance paths and reduce the effects of
glitches on the power supply line. Fast switching signals, such as
clocks, should be shielded with digital ground to avoid radiating
noise to other parts of the board. These signals should never be
run near the analog inputs. Avoid crossover of digital and analog
signals. Traces on opposite sides of the board should run at right
angles to each other. This reduces the effects of feedthrough
through the board. A microstrip method is best but not always
possible with a double-sided board. With this method, the
component side of the board is dedicated to ground plane while
signal traces are placed on the solder side.
Figure 35. ATE Application
The other AD588 provides a reference voltage for DAC 3 and
DAC 4. These provide the reference voltages for the window
nected to DUT GND. This causes VREF(+)B and VREF()B to be
referenced to DUT GND. As DAC 3 and DAC 4 input codes vary
from 000 . . . 000 to 111 . . . 111, VOUT3 and VOUT4 vary from 5 V
to +5 V with respect to DUT GND. DUT GND is also connected
to DSGB. When the AD7835 is cleared, VOUT3 and VOUT4 are
cleared to 0 V with respect to DUT GND.
The AD7834/AD7835 must have ample supply bypassing located
as close as possible to the package, ideally right up against the
device. Figure 36 shows the recommended capacitor values of
10 μF in parallel with 0.1 μF on each of the supplies. The 10 μF
capacitors are the tantalum bead type. The 0.1 μF capacitor can
have low effective series resistance (ESR) and effective series
inductance (ESI), such as the common ceramic types, which
provide a low impedance path to ground at high frequencies to
handle transient currents due to internal logic switching.
Care must be taken to ensure that the maximum and minimum
voltage specifications for the AD7835 reference voltages are
followed as shown in Figure 35.
10
μF
0.1
μF
1ADDITIONAL PINS OMITTED FOR CLARITY
10
μF
0.1
μF
10
μF
0.1
μF
AD7834/
AD78351
VDD
VCC
VSS
AGND
DGND
01006-036
POWER SUPPLY BYPASSING AND GROUNDING
In any circuit where accuracy is important, careful considera-
tion of the power supply and ground return layout helps to
ensure the rated performance. The printed circuit boards on
which the AD7834/AD7835 are mounted should be designed so
the analog and digital sections are separated and confined to
certain areas of the boards. This facilitates the use of ground
planes that can be easily separated. A minimum etch technique
is generally best for ground planes because it gives the best
shielding. Digital and analog ground planes should be joined at
only one place.
Figure 36. Power Supply Decoupling
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| AD7836ASZ | 功能描述:IC DAC 14BIT QUAD LC2MOS 44MQFP RoHS:是 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - 數(shù)模轉(zhuǎn)換器 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:1,000 系列:- 設(shè)置時(shí)間:1µs 位數(shù):8 數(shù)據(jù)接口:串行 轉(zhuǎn)換器數(shù)目:8 電壓電源:雙 ± 功率耗散（最大）:941mW 工作溫度:0°C ~ 70°C 安裝類型:表面貼裝 封裝/外殼:24-SOIC（0.295"，7.50mm 寬） 供應(yīng)商設(shè)備封裝:24-SOIC W 包裝:帶卷 (TR) 輸出數(shù)目和類型:8 電壓，單極 采樣率（每秒）:* |
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