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參數(shù)資料
| 型號： | MAX5174AEEE |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類： | DAC |
| 英文描述： | Low-Power, Serial, 12-Bit DACs with Voltage Output |
| 中文描述： | SERIAL INPUT LOADING, 18 us SETTLING TIME, 12-BIT DAC, PDSO16 |
| 封裝： | 0.150 INCH, 0.025 INCH PITCH, QSOP-16 |
| 文件頁數(shù)： | 10/16頁 |
| 文件大小： | 255K |
| 代理商： | MAX5174AEEE |
M
Low-Power, S erial, 12-Bit DACs
with Voltage Output
10
______________________________________________________________________________________
Detailed Desc ription
The MAX5174/MAX5176 12-bit, serial, voltage-output
DACs operate with a 3-wire serial interface. These
devices include a 16-bit shift register and a double-
buffered input composed of an input register and a
DAC register (see Functional Diagram. In addition,
these devices employ a rail-to-rail output amplifier and
internal trimmed resistors to provide a gain of
+1.638V/V, maximizing the output voltage swing. The
MAX5174/MAX5176’s offset adjust pin allows for a DC
shift in DAC outputs. The DACs are designed with an
inverted R-2R ladder network (Figure 1) that produces
a weighted voltage proportional to the reference volt-
age.
Referenc e Inputs
The reference input accepts both AC and DC values
with a voltage range extending from 0 to V
DD
- 1.4V.
The following equation represents the resulting output
voltage:
where N is the numeric value of the DAC’s binary input
code (0 to 4095), V
REF
is the reference voltage, and
Gain is the internally set voltage gain (1.638V/V if OS =
AGND). The maximum output voltage is V
DD
. The refer-
ence pin has a minimum impedance of 18k
and is
code dependent.
Output Amplifier
With OS connected to AGND, the output amplifier
employs an internal trimmed resistor-divider, setting the
gain to 1.638V/V and minimizing gain error. The output
amplifier has a typical slew rate of 0.6V/μs, and settles
to ±0.5LSB from a full-scale transition within 18μs when
loaded with 5k
in parallel with 100pF. Loads less than
2k
degrade performance. For alternative output
amplifier setups, refer to the Applications Information
section.
S hutdown Mode
The MAX5174/MAX5176 feature a software- and hard-
ware-programmable shutdown mode that reduces the
typical supply current to 1μA. Enter shutdown by writing
the appropriate input-control word as shown in Table 1
or by using the hardware shutdown. In shutdown mode,
the reference input and amplifier output both become
high impedance, and the serial interface remains
active. Data in the input register is saved, allowing the
MAX5174/MAX5176 to recall the prior output state
when returning to normal operation. Exit shutdown by
reloading the DAC register from the shift register, by
simultaneously loading the input and DAC registers, or
by toggling
PDL
. When returning from shutdown wait
40μs for the output to settle.
Power-Down Lockout
Power-down lockout disables the software/hardware
shutdown mode. A high-to-low transition on
PDL
brings
the device out of shutdown and returns the output to its
previous state.
Shutdown
Pulling SHDN high while
PDL
is high places the
MAX5174/MAX5176 in shutdown. Pulling SHDN low will
not return the device to normal operation. A high-to-low
transition on
PDL
or an appropriate command from the
serial data line (see Table 1 for commands) is required
to exit shutdown.
S erial-Interfac e
The MAX5174/MAX5176 3-wire serial interface is com-
patible with SPI and QSPI (Figure 2), and MICROWIRE
(Figure 3) interface standards. The 16-bit serial input
word consists of two control bits, 12 bits of data (MSB
to LSB), and two sub-bits.
The control bits determine the MAX5174/MAX5176’s
response as outlined in Table 1. The MAX5174/
MAX5176’s digital inputs are double buffered, which
allows any of the following:
Loading the input register without updating the DAC
register.
Updating the DAC register from the input register.
Updating the input and DAC registers simultaneously.
V
V
N
Gain
OUT
REF
=
4096
OUT_
OS_
R
R
SHOWN FOR ALL 1s ON DAC
D0
D9
D10
D11
2R
2R
2R
2R
2R
R
R
R
REF_
AGND
Figure 1. Simplified DAC Circuit Diagram
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX5174AEEE+ | 功能描述:數(shù)模轉(zhuǎn)換器- DAC 12-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 |
| MAX5174AEEE+T | 功能描述:數(shù)模轉(zhuǎn)換器- DAC 12-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 |
| MAX5174AEEE-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 |
| MAX5174BEEE | 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 |
| MAX5174BEEE+ | 功能描述:數(shù)模轉(zhuǎn)換器- DAC 12-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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