參數(shù)資料
型號(hào)： AD7804
廠商： Analog Devices, Inc.
英文描述： +3.3 V to +5 V Quad/Octal 10-Bit DACs
中文描述： 3.3伏至5伏四/八通道10位DAC
文件頁(yè)數(shù)： 20/28頁(yè)
文件大小： 300K
代理商： AD7804
AD7804/AD7805/AD7808/AD7809
REV. A
–20–
V
BIAS
2
32
MAIN DAC RANGE
SUB DAC
RANGE
CHANNEL RANGE MIN CODE LOADED TO SUB DAC
CHANNEL RANGE CENTER CODE LOADED TO SUB DAC
CHANNEL RANGE MAX CODE LOADED TO SUB DAC
V
BIAS
32
32
V
BIAS
6232
V
BIAS
1
32
V
BIAS
332
V
BIAS
3132
V
BIAS
3332
V
BIAS
6132
V
BIAS
6332
Figure 28. Pictorial View of Transfer Function for Any DAC Channel
Grounding and Layout Techniques
To obtain optimum performance from the AD7804/AD7805/
AD7808/AD7809 care should be taken with the layout. Causes
for concern would be feedthrough from the interface bus onto
the analog circuitry particularly the reference pins and ground
loops. The board should be designed such that the analog and
digital sections are separated as much as possible. Ground plan-
ing and shielding should be used as much as possible. Digital
and analog ground planes should only be joined in one place to
avoid ground loops. The ideal place to join the ground planes is
at the analog and digital ground pins of the DAC. Alternatively
a star ground should be established on the board to which all
other grounds are returned. Good decoupling is important in
achieving optimum performance. All supplies, analog or digital,
should be decoupled with 10
μ
F tantalum and 0.1
μ
F ceramic
capacitors to their respective grounds, and should be as close as
possible to the pins of the device. The main aim of the bypass-
ing element is to maximize the charge stored in the bypass loop
while simultaneously minimizing the inductance of this loop.
Inductance in the loop acts as an impedance to high frequency
transients and results in power supply spiking. By keeping the
decoupling as close as possible to the device, the loop area is kept
to a minimum thus reducing the possibility of power supply spikes.
On the AD7805 the REFOUT pin of the device is located next
to the DB9 of the data bus, to reduce the risk of digital feed-
through and noise being coupled from the digital section onto
the reference, the REFOUT pin and any trace connected to it
should be shielded with analog ground. To reduce the noise on
this reference it should be decoupled with a 0.01
μ
F capacitor to
analog ground, keeping the capacitor as close as possible to the
device. The comp pin which is the output from the internal
V
DD
/2 reference is located next to V
OUT
D on the DAC and is
sensitive to noise pickup and feedthrough from the DAC output
and thus should be shielded with analog ground to keep this
reference point as quiet as possible. The comp pin should be
decoupled both to AV
DD
and AGND with 1–10 nF ceramic
capacitors. The external REFIN pin should also be shielded
with analog ground from the digital pins located next to it.
The same precautions should be taken with the reference pins
on the AD7804/AD7808 to reduce the risk of noise pickup and
feedthrough.
Reference Settling Time
With the REFOUT on the AD7804/AD7805/AD7808/AD7809
decoupled with a 0.01
μ
F capacitor to AGND it takes the
REFOUT approximately 2 ms to fully settle after taking the
device out of power down. When this capacitor is reduced to
1 nF the settling time reduces to 150
μ
s. The size of the capaci-
tor required on the REFOUT depends to a large extent on the
layout, if the REFOUT is well shielded with AGND the size of
the capacitor can be reduced thus reducing the settling time for
the reference. The internal V
DD
/2 reference provided at the
comp pin when decoupled with a 1 nF capacitor to both AV
DD
and AGND has very fast settling time, typically less than 500 ns.
相關(guān)PDF資料
PDF描述
AD7804BN ECONOLINE: REC2.2-S_DRW(Z)/H* - 2.2W DIP Package- 1kVDC Isolation- Regulated Output- 4.5-9V, 9-18V, 18-36V, 36-72V Wide Input Range 2 : 1- UL94V-0 Package Material- Continuous Short Circiut Protection- Cost Effective- 100% Burned In- Efficiency to 84%
AD7804BR +3.3 V to +5 V Quad/Octal 10-Bit DACs
AD7805BN %2B3.3V to %2B5V Quad/Octal 10-Bit DACs
AD7805BR %2B3.3V to %2B5V Quad/Octal 10-Bit DACs
AD7805BRS +3.3 V to +5 V Quad/Octal 10-Bit DACs
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
AD7804BN 制造商:Analog Devices 功能描述:DAC 4-CH 10-bit 16-Pin PDIP Tube 制造商:Rochester Electronics LLC 功能描述:QUAD 10-BIT SERIAL DAC - Bulk
AD7804BNZ 功能描述:IC DAC 10BIT QUAD SERIAL 16DIP 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:Data Converter Fundamentals DAC Architectures 標(biāo)準(zhǔn)包裝:750 系列:- 設(shè)置時(shí)間:7µs 位數(shù):16 數(shù)據(jù)接口:并聯(lián) 轉(zhuǎn)換器數(shù)目:1 電壓電源:雙 ± 功率耗散（最大）:100mW 工作溫度:0°C ~ 70°C 安裝類型:表面貼裝 封裝/外殼:28-LCC（J 形引線） 供應(yīng)商設(shè)備封裝:28-PLCC（11.51x11.51） 包裝:帶卷 (TR) 輸出數(shù)目和類型:1 電壓，單極；1 電壓，雙極 采樣率（每秒）:143k
AD7804BR 功能描述:IC DAC 10BIT 3.3V QUAD 16-SOIC RoHS:否 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:Data Converter Fundamentals DAC Architectures 標(biāo)準(zhǔn)包裝:750 系列:- 設(shè)置時(shí)間:7µs 位數(shù):16 數(shù)據(jù)接口:并聯(lián) 轉(zhuǎn)換器數(shù)目:1 電壓電源:雙 ± 功率耗散（最大）:100mW 工作溫度:0°C ~ 70°C 安裝類型:表面貼裝 封裝/外殼:28-LCC（J 形引線） 供應(yīng)商設(shè)備封裝:28-PLCC（11.51x11.51） 包裝:帶卷 (TR) 輸出數(shù)目和類型:1 電壓，單極；1 電壓，雙極 采樣率（每秒）:143k
AD7804BR-REEL 功能描述:IC DAC 10BIT QUAD SRL 16-SOIC RoHS:否 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - 數(shù)模轉(zhuǎn)換器 系列:- 標(biāo)準(zhǔn)包裝:47 系列:- 設(shè)置時(shí)間:2µs 位數(shù):14 數(shù)據(jù)接口:并聯(lián) 轉(zhuǎn)換器數(shù)目:1 電壓電源:單電源 功率耗散（最大）:55µW 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:28-SSOP（0.209"，5.30mm 寬） 供應(yīng)商設(shè)備封裝:28-SSOP 包裝:管件 輸出數(shù)目和類型:1 電流，單極；1 電流，雙極 采樣率（每秒）:*
AD7804BRZ 功能描述:IC DAC 10BIT QUAD SRL 16-SOIC RoHS:是 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - 數(shù)模轉(zhuǎn)換器 系列:- 標(biāo)準(zhǔn)包裝:1 系列:- 設(shè)置時(shí)間:4.5µs 位數(shù):12 數(shù)據(jù)接口:串行，SPI? 轉(zhuǎn)換器數(shù)目:1 電壓電源:單電源 功率耗散（最大）:- 工作溫度:-40°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:8-SOIC（0.154"，3.90mm 寬） 供應(yīng)商設(shè)備封裝:8-SOICN 包裝:剪切帶 (CT) 輸出數(shù)目和類型:1 電壓，單極；1 電壓，雙極 采樣率（每秒）:* 其它名稱:MCP4921T-E/SNCTMCP4921T-E/SNRCTMCP4921T-E/SNRCT-ND
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