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参数资料
| 型号： | DS4426T+T&R |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 13/15页 |
| 文件大小： | 0K |
| 描述： | IC DAC I2C-MARGINING 4CH 28-TQFN |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 位数： | 8 |
| 数据接口： | I²C |
| 转换器数目： | 4 |
| 电压电源： | 单电源 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 28-WFQFN 裸露焊盘 |
| 供应商设备封装： | 28-TQFN-EP（4x4） |
| 包装： | 带卷 (TR) |
| 输出数目和类型： | 4 电流，单极 |
| 采样率（每秒）： | * |
DS4426
Quad-Channel, I2C-Margining IDACs with
Three Channels of Power-Supply Tracking
_______________________________________________________________________________________
7
Using the external resistors RFS[3:0] to set the output-
current range, the DS4426 provides some flexibility for
adjusting the impedances of the feedback network or
the range over which the power supply can be con-
trolled or margined.
As a source for biasing instrumentation or other circuits,
the DS4426 provides a simple and inexpensive current
source with an I2C interface for control. The adjustable,
full-scale range allows the application to get the most
out of its 7-bit sink or source resolution.
Power-Supply Tracking Circuit
By making use of the power-supply tracking circuitry,
the DS4426 has the ability to source current on power-
up. This current is additive with the current DAC
source/sink currents and is determined by the value of
the gain resistor, RG, and the supply voltage, VCC. This
current is controlled by the voltages presented to the
corresponding INP and INN pins, and the voltages pre-
sented to the corresponding threshold (THR) pins.
Maximum Source Current
The maximum current the DS4426 can source at
power-up using the power-supply tracking circuitry
depends on the value of the supply voltage, VCC, and
the gain resistor, RG, connected from the correspond-
ing GAIN pin to VCC. The maximum current (IMAX) that
can be sourced to the corresponding OUT pin can be
estimated using the following equation:
The power-supply tracking circuit can be estimated
with Figure 2.
Inputs for Power-Supply Tracking:
INP and INN
Each pair of power-supply tracking inputs, INP and
INN, determines if and how much of the IMAX current is
sourced when the power-supply tracking circuit is
enabled. When the difference between the voltage pre-
sented to INP (VINP) and INN (VINN) is more than
approximately +0.3V, then the maximum source cur-
rent, as determined by the value IMAX, is sourced into
the OUT pin connection. When the difference between
VINP and VINN is less than approximately -0.2V, then no
current is sourced into the corresponding OUT pin. The
change in current from no current to IMAX can be esti-
mated by the power-supply tracking gain, GVI (see the
Power-Supply Tracking Characteristics table).
Figure 3 shows the typical current behavior of the
power-supply tracking circuit with respect to the volt-
age difference seen at the INP and INN inputs.
I
VV
R
MAX
CC
OUT
G
()
MSB
LSB
CURRENT
DAC[3:0]
OUT[3:0]
FS[3:0]
TRACKING
OUT[3:1] ONLY
I2C CONTROL
127 POSITIONS
EACH FOR SOURCE
AND SINK MODE
SOURCE
OR
SINK MODE
RFS[3:0]
Figure 1. Current DAC Detail
+
INP
GAIN
VCC
DAC
OUT
SLAVE
FEEDBACK
NODE
GVI
RG
-
INN
SHUTDOWN
Figure 2. Gain Stage
I
-0.2
+0.3
AT VCC = +5.0V
IMAX
GVI
V
(VINP - VINN)
Figure 3. INP and INN Differential Inputs
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相关代理商/技术参数 |
参数描述 |
|---|---|
| DS443 | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Analog IC |
| DS4432 | 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:Dual-Channel, I2C, 7-Bit Sink/Source Current DAC |
| DS4432U+ | 功能描述:数模转换器- DAC 2Ch I2C Adj Sink-Source RoHS:否 制造商:Texas Instruments 转换器数量:1 DAC 输出端数量:1 转换速率:2 MSPs 分辨率:16 bit 接口类型:QSPI, SPI, Serial (3-Wire, Microwire) 稳定时间:1 us 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-14 封装: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:数模转换器- DAC 2Ch I2C Adj Sink-Source RoHS:否 制造商:Texas Instruments 转换器数量:1 DAC 输出端数量:1 转换速率:2 MSPs 分辨率:16 bit 接口类型:QSPI, SPI, Serial (3-Wire, Microwire) 稳定时间:1 us 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-14 封装:Tube |
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