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參數(shù)資料
| 型號： | DS4424N+T&R |
| 廠商： | Maxim Integrated Products |
| 文件頁數(shù)： | 11/11頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC DAC 7BIT 4CH 5.5V 14-TDFN |
| 產(chǎn)品培訓(xùn)模塊： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 標(biāo)準(zhǔn)包裝： | 2,500 |
| 位數(shù)： | 7 |
| 數(shù)據(jù)接口： | 串行 |
| 轉(zhuǎn)換器數(shù)目： | 4 |
| 電壓電源： | 單電源 |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 14-WFDFN 裸露焊盤 |
| 供應(yīng)商設(shè)備封裝： | 14-TDFN-EP（3x3） |
| 包裝： | 帶卷 (TR) |
| 輸出數(shù)目和類型： | 4 電流，單極 |
| 采樣率（每秒）： | * |
DS4422/DS4424
Two-/Four-Channel, I2C, 7-Bit Sink/Source
Current DAC
_______________________________________________________________________________________
9
Applications Information
Example Calculations
for an Adjustable Power Supply
In this example, the
Typical Operating Circuit is used
as a base to create Figure 3, a DC-DC output voltage
of 2.0V with ±20% margin. The adjustable power sup-
ply has a DC-DC converter output voltage, VOUT, of
2.0V and a DC-DC converter feedback voltage, VFB, of
0.8V. To determine the relationship of R0A and R0B,
start with the equation:
Substituting VFB = 0.8V and VOUT = 2.0V, the relation-
ship between R0A and R0B is determined to be:
R0A
≈ 1.5 x R0B
IOUT0 is chosen to be 100A (midrange source/sink
current for the DS4422/DS4424). Summing the currents
into the feedback node produces the following:
IOUT0 = IR0B - IR0A
Where:
And:
To create a 20% margin in the supply voltage, the value
of VOUT is set to 2.4V. With these values in place, R0B
is calculated to be 2.67k
Ω, and R0A is calculated to be
4.00k
Ω. The current DAC in this configuration allows
the output voltage to be moved linearly from 1.6V to
2.4V using 127 settings. This corresponds to a resolu-
tion of 6.3mV/step.
VCC Decoupling
To achieve the best results when using the DS4422/
DS4424, decouple the power supply with a 0.01F or
0.1F capacitor. Use a high-quality ceramic surface-
mount capacitor if possible. Surface-mount compo-
nents minimize lead inductance, which improves
performance, and ceramic capacitors tend to have
adequate high-frequency response for decoupling
applications.
Power Rail Considerations
Given that the absolute maximum rating for the OUT
pins is VCC + 0.5V, it is recommended that the DS4424
power rail be brought up before or at the same time as
the power rail of the source it is controlling.
I
VV
R
R0A
OUT
FB
0A
=
I
V
R
R0B
FB
0B
=
V
R
RR
FB
0B
0A +
0B
OUT
=× V
DC-DC
CONVERTER
FB
OUT
SDA
SCL
A0
A1
OUT0
GND
*VOUT AND VFB VALUES ARE DETERMINED BY THE DC-DC CONVERTER AND SHOULD NOT BE CONFUSED WITH VOUT AND VRFS OF THE DS4422/DS4424.
RFS0 = 80k
Ω
4.7k
Ω
4.7k
Ω
VCC
VOUT* = 2.0V
VFB* = 0.8V
FS0
R0B= 2.67k
Ω
R0A = 4.00k
Ω
DS4422/
DS4424
I0A
I0B
IOUT0
Figure 3. Example Application Circuit
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| DS4425 | 制造商:MAXIM 制造商全稱:Maxim Integrated Products 功能描述:106.25MHz/212.5MHz/425MHz Clock Oscillators |
| DS4425AN+ | 功能描述:標(biāo)準(zhǔn)時鐘振蕩器 425Mhz Clock Oscillator RoHS:否 制造商:AVX 產(chǎn)品:Standard Clock Oscillators 封裝 / 箱體:7 mm x 5 mm 頻率:75 MHz 頻率穩(wěn)定性:50 PPM 電源電壓:2.5 V 負(fù)載電容: 端接類型:SMD/SMT 最小工作溫度:0 C 最大工作溫度:+ 70 C 輸出格式:LVDS 尺寸: 封裝:Reel 系列: |
| DS4425BN+ | 功能描述:標(biāo)準(zhǔn)時鐘振蕩器 425Mhz Clock Oscillator RoHS:否 制造商:AVX 產(chǎn)品:Standard Clock Oscillators 封裝 / 箱體:7 mm x 5 mm 頻率:75 MHz 頻率穩(wěn)定性:50 PPM 電源電壓:2.5 V 負(fù)載電容: 端接類型:SMD/SMT 最小工作溫度:0 C 最大工作溫度:+ 70 C 輸出格式:LVDS 尺寸: 封裝:Reel 系列: |
| DS4426 | 制造商:MAXIM 制造商全稱:Maxim Integrated Products 功能描述:Quad-Channel, I2C-Margining IDACs with Three Channels of Power-Supply Tracking |
| DS4426T+ | 功能描述:數(shù)模轉(zhuǎn)換器- DAC 4Ch I2C Migrt w/3 ch P-Sup Track RoHS:否 制造商:Texas Instruments 轉(zhuǎn)換器數(shù)量:1 DAC 輸出端數(shù)量:1 轉(zhuǎn)換速率:2 MSPs 分辨率:16 bit 接口類型:QSPI, SPI, Serial (3-Wire, Microwire) 穩(wěn)定時間:1 us 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-14 封裝:Tube |
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