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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)： | 2/15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）： | * |
Inputs for Tracking in DC-DC Power
Applications
When enabling/disabling the power-supply tracking, a
resistor-divider connected to the THR input sets the dis-
able threshold (see VTHRESHOLD in Figure 4). The top
of the resistor-divider must be connected to the master
DC-DC voltage for correct operation. Below this thresh-
old, the tracking circuit is active.
Power-Supply Sequencing
The DS4426 can be used to perform power-supply
sequencing. This is a subset of power-supply tracking
with modifications to the external resistor network. The
basic concept is that the DS4426 sources maximum
current into the slave power supply's feedback node
until a voltage in the system has risen above a specific
voltage level. By sourcing the maximum current into the
feedback node, the power supply's output is held off.
Maximum sourcing current is achieved with two steps:
1) Apply the maximum allowed input voltage across
INP and INN. Connect INP to VCC - 1.4V using a
voltage-divider to ground. Connect INN to ground.
2) Set the gain to the maximum allowed (RL/RG = 5).
The slave power supply is allowed to turn on once the
voltage on THR is greater than VREF/2. Use a resistor-
divider connected to the rising system voltage to scale
the trip point to VREF/2.
I2C Slave Address
The DS4426 responds to one of four I2C slave address-
es determined by the state of the input on the two
address inputs. The two input states are connected to
VCC or connected to ground.
Memory Organization
The DS4426’s current sources are controlled by writing
to memory addresses listed in Table 2.
The format of each of the output control registers is
given by:
where:
For example:
RFS0 = 80k
Ω and register 0xF8h is written to a value of
0xAAh. Use the following formula to calculate the out-
put current:
IFS = (1.0V/80k
Ω) x (127/16) = 99.22A
The MSB of the output register is 1, so the output is
sourcing the value corresponding to position 2Ah (42
decimal). The magnitude of the output current is equal
to the following:
99.22A x (42/127) = 32.8125A
DS4426
Quad-Channel, I2C-Margining IDACs with
Three Channels of Power-Supply Tracking
10
______________________________________________________________________________________
A1
A0
SLAVE ADDRESS (HEX)
GND
90h
GND
VCC
92h
VCC
GND
94h
VCC
96h
Table 1. Slave Addresses
MEMORY ADDRESS (HEX)
CURRENT SOURCE
F8h
OUT0
F9h
OUT1
FAh
OUT2
FBh
OUT3
Table 2. Memory Addresses
BIT 7
(MSB)
BIT 6
BIT 5
BIT 4
BIT 3
BIT 2
BIT 1
BIT 0
(LSB)
S
D6
D5
D4
D3
D2
D1
D0
BIT
NAME
DESCRIPTION
POWER-ON
DEFAULT
S
Sign
Bit
Determines if DAC sources or
sinks current. For sink, S = 0.
For source, S = 1.
0b
DX
Data
7-bit data word controlling DAC
output. Setting 0000000b
outputs zero current regardless
of the state of the sign bit.
0000000b
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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 |
| DS4432U+T&R | 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 |
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