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參數(shù)資料
| 型號(hào)： | MAX5171 |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | Low-Power, Serial, 14-Bit DACs with Force/Sense Voltage Output |
| 中文描述： | 低功耗、串行、14位DAC，帶有加載-感應(yīng)電壓輸出 |
| 文件頁(yè)數(shù)： | 10/16頁(yè) |
| 文件大?。?/td> | 256K |
| 代理商： | MAX5171 |
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M
Low-Power, S erial, 14-Bit DACs
with Forc e/S ense Voltage Output
10
______________________________________________________________________________________
Detailed Desc ription
The MAX5171/MAX5173 14-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, the
negative terminal of the output amplifier is available.
The DACs are designed with an inverted R-2R ladder
network (Figure 1), which produces a weighted voltage
proportional to the reference voltage.
Referenc e Input
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 16383), V
REF
is the reference voltage, and
Gain is the externally set voltage gain. The maximum
output voltage is V
DD
. The reference pin has a mini-
mum impedance of 18k
and is code dependent.
Output Amplifier
The MAX5171/MAX5173’s DAC output is internally
buffered by a precision amplifier with a typical slew rate
of 0.6V/μs. Access to the output amplifier’s inverting
input provides flexibility in output gain setting and sig-
nal conditioning (see Applications Information.
The output amplifier settles to ±0.5LSB from a full-scale
transition within 12μs, when loaded with 5k
in parallel
with 100pF. Loads less than 2k
degrade performance.
Shutdown Mode
The MAX5171/MAX5173 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 become high-
impedance, and the serial interface remains active.
Data in the input register is saved, allowing the
MAX5171/MAX5173 to recall the prior output state
when returning to normal operation. To exit shutdown,
reload the DAC register from the shift register by simul-
taneously 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, returning the output to its
previous state.
Shutdown
Pulling SHDN high while
PDL
is high places the
MAX5171/MAX5173 in shutdown mode. Pulling SHDN
low does not return the device to normal operation. A
high-to-low transition on
PDL
or an appropriate com-
mand from the serial data line is required to exit shut-
down (see Table 1 for commands).
Serial Interface
The MAX5171/MAX5173 3-wire serial interface is com-
patible with SPI/QSPI (Figure 2) and MICROWIRE
(Figure 3) interface standards. The 16-bit serial input
word consists of two control bits and 14 bits of data
(MSB to LSB).
The control bits determine the MAX5171/MAX5173’s
response as outlined in Table 1. The MAX5171/
MAX5173’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
16384
OUT
REF
=
OUT
FB
SHOWN FOR ALL 1s ON DAC
D11
2R
2R
2R
2R
2R
R
R
R
REF
AGND
Figure 1. Simplified DAC Circuit Diagram
相關(guān)PDF資料 |
PDF描述 |
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| MAX5171AEEE | Low-Power, Serial, 14-Bit DACs with Force/Sense Voltage Output |
| MAX5171BEEE | Low-Power, Serial, 14-Bit DACs with Force/Sense Voltage Output |
| MAX5183BEEI | Dual, 10-Bit, 40MHz, Current/Voltage Simultaneous-Output DACs |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX5171AEEE | 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 |
| MAX5171AEEE+ | 功能描述:數(shù)模轉(zhuǎn)換器- DAC 14-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 |
| MAX5171AEEE+T | 功能描述:數(shù)模轉(zhuǎn)換器- DAC 14-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 |
| MAX5171AEEE-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 |
| MAX5171BEEE | 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 |
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