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參數(shù)資料
| 型號(hào)： | DS4426T+T&R |
| 廠商： | Maxim Integrated Products |
| 文件頁數(shù)： | 5/15頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC DAC I2C-MARGINING 4CH 28-TQFN |
| 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)： | 8 |
| 數(shù)據(jù)接口： | I²C |
| 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： | 28-WFQFN 裸露焊盤 |
| 供應(yīng)商設(shè)備封裝： | 28-TQFN-EP（4x4） |
| 包裝： | 帶卷 (TR) |
| 輸出數(shù)目和類型： | 4 電流，單極 |
| 采樣率（每秒）： | * |
Applications Information
Example Calculations for an Adjustable
Power Supply
In this example, the circuit shown in Figure 8 is used to
margin a +2.0V supply by ±20%. The margined power
supply 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 rela-
tionship 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 DS4426). Summing the currents into the
feedback node, we have 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
I
VV
R
RA
OUT
FB
A
0
=
I
V
R
RB
FB
B
0
=
V
R
RR
V
FB
B
AB
OUT
=
+
×
0
00
DS4426
Quad-Channel, I2C-Margining IDACs with
Three Channels of Power-Supply Tracking
______________________________________________________________________________________
13
DC-DC
CONVERTER
FB
OUT
SDA
SCL
OUT0
GND
RFS0 = 80k
Ω
4.7k
Ω
4.7k
Ω
VCC
VOUT = 2.0V*
FS0
R0B = 2.67k
Ω
R0A = 4k
Ω
VFB = 0.8V*
IR0A
IR0B
IOUT0
DS4426
*VOUT AND VFB VALUES ARE DETERMINED BY THE DC-DC CONVERTER AND SHOULD NOT BE CONFUSED WITH VOUT AND VREF OF THE DS4426.
Figure 8. Example Typical Application Circuit
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| DS4432U+T&R | 制造商:Maxim Integrated Products 功能描述:DUAL-CHANNEL, I?C ADJUSTABLE SINK/SOURCE CURRENT DAC - Tape and Reel 制造商:Maxim Integrated Products 功能描述:MXMDS4432U+T&R DUAL-CHANNEL, I?°?C ADJUSTA 制造商:Maxim Integrated Products 功能描述:IC DAC 7BIT 2CH 5.5V 8-MSOP |
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