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參數(shù)資料
| 型號(hào)： | DS4426T+T&R |
| 廠商： | Maxim Integrated Products |
| 文件頁(yè)數(shù)： | 12/15頁(yè) |
| 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）： | * |
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Detailed Description
The DS4426 contains four I2C-adjustable current
sources that are each capable of sinking and sourcing
current. Three of the current outputs (OUT[3:1]) also
have power-supply tracking circuitry that allows addi-
tional current to be sourced during power-up.
Adjustable Current DACs
Each output (OUT[3:0]) has 127 sink and 127 source
settings that are programmed through the I2C interface.
The full-scale current ranges (and corresponding step
sizes) of the outputs are determined by external resis-
tors connected to the corresponding FS pins (see
Figure 1). The formula to determine the external resistor
values (RFS) for each output is given by:
where IFS is the desired full-scale current value, VRFS is
the RFS voltage (see the DC Electrical Characteristics
table), and RFS is the external resistor value.
To calculate the output-current value (IOUT) based on the
corresponding DAC value (see Table 2 for correspond-
ing memory addresses), use the following equation:
On power-up, the DS4426 current DAC outputs are set
to zero current. This is done to prevent the device from
sinking or sourcing an incorrect current before the sys-
tem host controller has a chance to modify its setting.
Note, however, that if power-supply tracking is enabled
(see the
Power-Supply Tracking Circuit section), then
the DS4426 can still source current at power-up.
When used in adjustable power-supply applications
(see Figure 8), the DS4426 does not affect the initial
power-up voltage of the supply because it defaults to
providing zero output current on power-up unless
power-supply tracking is enabled. As it sources or
sinks current into the feedback voltage node, it
changes the amount of output voltage required by the
regulator to reach its steady-state operating point.
I
DACValue dec
I
OUT
FS
=×
()
127
R
V
I
FS
RFS
FS
=
×
16
127
DS4426
Quad-Channel, I2C-Margining IDACs with
Three Channels of Power-Supply Tracking
6
_______________________________________________________________________________________
Pin Description
PIN
NAME
FUNCTION
1
SDA
Serial Data Input/Output. I2C data pin.
2
SCL
Serial Clock Input. I2C clock input.
3
VCC
Voltage Supply
4
OUT0
Current DAC Output
5, 6, 7
OUT1, OUT2, OUT3
Current DAC and Tracking Control Output
8
GND
Ground
9
A0
I2C Address Input 0
10
A1
I2C Address Input 1
11, 13, 15
INP1, INP2, INP3
Power-Supply Tracking Positive Input
12, 14, 16
INN1, INN2, INN3
Power-Supply Tracking Negative Input
17, 19, 20
THR3, THR2, THR1
Threshold Input. Comparator input used to set threshold for tracking
enable/disable based on VREF/2.
18
DNC
Do Not Connect
21–24
FS0, FS1, FS2, FS3
Full-Scale Calibration Input. A resistor-to-ground on this input determines full-
scale output current on the associated output.
25, 26, 27
GAIN3, GAIN2,
GAIN1
Gain Adjustment Pin. Connect a resistor between this pin and VCC.
28
N.C.
No Connection
—
EP
Exposed Pad. No connection.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| DS443 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Analog IC |
| DS4432 | 制造商:MAXIM 制造商全稱:Maxim Integrated Products 功能描述:Dual-Channel, I2C, 7-Bit Sink/Source Current DAC |
| DS4432U+ | 功能描述:數(shù)模轉(zhuǎn)換器- DAC 2Ch I2C Adj Sink-Source 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(shí)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 |
| 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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