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參數(shù)資料
| 型號(hào)： | MAX538 |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | +5V, Low-Power, Voltage-Output, Serial 12-Bit DACs(單通道,電壓輸出,12位串行D/A轉(zhuǎn)換器) |
| 中文描述： | +5V、低功耗、電壓輸出、串行12位DAC |
| 文件頁(yè)數(shù)： | 12/16頁(yè) |
| 文件大小： | 174K |
| 代理商： | MAX538 |
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M
S ingle-S upply Linearity
As with any amplifier, the MAX531/MAX538/MAX539’s
output buffer can be positive or negative. When the off-
set is positive, it is easily accounted for (Figure 10).
However, when the offset is negative, the buffer output
cannot follow linearly when there is no negative supply.
In that case, the amplifier output (VOUT) remains at
ground until the DAC voltage is sufficient to overcome
the offset and the output becomes positive.
Normally, linearity is measured after accounting for
zero error and gain error. Since, in single-supply oper-
ation, the actual value of a negative offset is unknown, it
cannot be accounted for during test. Additionally, the
output buffer amplifier exhibits a nonlinearity near-zero
output when operating with a single supply. To account
for this nonlinearity in the MAX531/MAX538/MAX539,
linearity and gain error are measured from code 11 to
code 4095. The output buffer’s offset and nonlinear
behavior do not affect monotonicity, and these DACs
are guaranteed monotonic starting with code zero. In
dual-supply operation, linearity and gain error are mea-
sured from code 0 to 4095.
Power-S upply Bypassing and Ground
Management
Best system performance is obtained with printed cir-
cuit boards that use separate analog and digital
ground planes. Wire-wrap boards are not recommend-
ed. The two ground planes should be connected
together at the low-impedance power-supply source.
DGND and AGND should be connected together at the
chip. For the MAX531 in single-supply applications,
connect V
SS
to AGND at the chip. The best ground
connection may be achieved by connecting the DAC's
DGND and AGND pins together and connecting that
point to the system analog ground plane. If the DAC's
DGND is connected to the system digital ground, digi-
tal noise may get through to the DAC’s analog portion.
Bypass V
DD
(and V
SS
in dual-supply mode) with a
0.1μF ceramic capacitor, connected between V
DD
and
AGND (and between V
SS
and AGND). Mount with
short leads close to the device. Ferrite beads may also
be used to further isolate the analog and digital power
supplies.
Figures 11a and 11b illustrate the grounding and
bypassing scheme described.
S aving Power
When the DAC is not being used by the system, mini-
mize power consumption by setting the appropriate
code to minimize load current. For example, in bipolar
mode, with a resistive load to ground, set the DAC
code to mid-scale (see Table 3). If there is no output
load, minimize internal loading on the reference by set-
ting the DAC to all 0s (on the MAX531, use CLR).
Under this condition, REFIN is high impedance and the
op amp operates at its minimum quiescent current.
5V, Low-Power, Voltage-Output,
S erial 12-Bit DACs
12
______________________________________________________________________________________
Figure 8. Bipolar Configuration (-2.048V to +2.048V Output)
Table 3. Bipolar (Offset Binary) Code Table (-V
REFIN
to +V
REFIN
Output)
33μF
REFIN
REFOUT
AGND
DGND
BIPOFF
RFB
VOUT
V
OUT
-5V
+5V
MAX531
INPUT
OUTPUT
1111
1111
1111
1000
0000
0001
1000
0000
0000
0111
1111
1111
0000
0000
0001
0000
0000
0000
(+V
REFIN
)2048
(+V
REFIN
) 2048
(-V
REFIN
)2048
(-V
REFIN
)2048
0V
(-V
REFIN
)2048 = -V
REFIN
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX5380LEUK | 制造商:Maxim Integrated Products 功能描述:- Cut Tape Product |
| MAX5380LEUK+ | 制造商:Maxim Integrated Products 功能描述:DAC SGL CURRENT STEERING 8BIT 5PIN SOT-23 - Rail/Tube |
| MAX5380LEUK+T | 功能描述:數(shù)模轉(zhuǎn)換器- DAC 8-Bit Precision DAC 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 |
| MAX5380LEUK-T | 功能描述:數(shù)模轉(zhuǎn)換器- DAC 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 |
| MAX5380MEUK | 制造商:Maxim Integrated Products 功能描述:- Cut Tape Product 制造商:Rochester Electronics LLC 功能描述: |
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