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參數(shù)資料
| 型號(hào)： | MAX5742 |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | Dual Very-High Speed, High-Current Peripheral Drivers 8-CDIP -55 to 125 |
| 中文描述： | 12位、低功耗、四路、電壓輸出DAC，串行接口 |
| 文件頁(yè)數(shù)： | 9/15頁(yè) |
| 文件大?。?/td> | 676K |
| 代理商： | MAX5742 |
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M
12-Bit, Low-Power, Quad, Voltage-Output
DAC with Serial Interface
_______________________________________________________________________________________
9
Detailed Description
The MAX5742 contains four 12-bit, voltage-output, low-
power digital-to-analog converters (DACs). Each DAC
employs a resistor string architecture that converts a
12-bit digital input word to an equivalent analog output
voltage proportional to the applied reference voltage.
The MAX5742 shares one reference input (REF)
between all four DACs. The MAX5742 includes rail-to-
rail output buffer amplifiers for each DAC, and input
logic for simple microprocessor (μP), and CMOS inter-
faces. The power-supply range is from +2.7V to +5.5V
(
Functional Diagram
). The MAX5742
’
s reference input
accepts a voltage range from 0 to V
DD
. In power-down
mode the reference input is high impedance. The
MAX5742 is compatible with the 3-wire SPI, QSPI,
MICROWIRE and DSP serial interface with Schmitt-trig-
gered logic inputs.
Reference Input and DAC Output Range
The reference input accepts positive DC and AC sig-
nals. The voltage at REF sets the full-scale output volt-
age of the four DACs. The reference input voltage
range is 0 to V
DD
. The impedance at REF is 45k
. The
voltage at REF can vary from GND to V
DD
. The output
voltages (V
OUT_
) are represented by a digitally pro-
grammable voltage source as:
V
OUT_
= (V
REF
D) / 2
12
where D is the decimal equivalent of binary DAC input
code ranging from 0 to 4095. V
REF
is the voltage at
REF.
Output Buffer Amplifiers
All DACs are internally buffered at the output. The
buffer amplifiers have both rail-to-rail common mode
and (GND to V
REF
) output voltage range. The buffers
are unity-gain stable with C
L
= 200pF and R
L
= 5k
.
Buffer amplifiers are disabled during power-up and
individual DAC outputs are shorted to GND through a
100k
resistor. Buffer amplifiers can individually or alto-
gether be powered-down by programming the input
register control bits. During power down, contents of
the input and DAC registers remain the same. On
wake-up, all DAC outputs are restored to their pre-
power-down voltage values.
Power-Down Mode
In power-down mode, the DAC outputs are pro-
grammed to one of three output states, 1k
, 100k
, or
floating (Table 1). The REF input is high impedance
(2M
typ) to conserve current drain from the system
reference; therefore, the system reference does not
have to be powered-down. The DAC outputs return to
the values contained in the registers when brought out
of power-down. The recovery time, from total power-
down to power-up, is 8μs. This extra time is needed to
allow the internal bias to wake-up. Power-down mode
reduces current consumption to 0.3μA.
3-Wire Serial Interface
The MAX5742 digital interface is a standard 3-wire con-
nection compatible with SPI/QSPI/MICROWIRE/DSP
interfaces. The chip-select input (
CS
) frames the serial
data loading at DIN. Immediately following
CS
high-to-
low transition, the data is shifted synchronously and
latched into the input register on the falling edge of the
serial clock input (SCLK). After 16 bits have been
loaded into the serial input register, it transfers its con-
tents to the DAC latch.
CS
may then either be held low
or brought high.
CS
must be brought high for a mini-
mum of 80ns before the next write sequence, since a
Pin Description
PIN
NAME
FUNCTION
1
CS
Chip-Select Input
2
SCLK
Serial-Clock Input
3
V
DD
Power-Supply Input
4
GND
Ground
5
DIN
Serial Data Input
6
REF
External Reference Voltage Input
7
–
10
OUTA
–
OUTD
DAC Voltage Outputs. Power-on reset sets DAC registers to zero, and internally connects
OUT to GND with 100k
resistor.
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| MAX5742EUB | 12-Bit, Low-Power, Quad, Voltage-Output DAC with Serial Interface |
| MAX5812PEUT | 12-Bit Low-Power, 2-Wire, Serial Voltage-Output DAC |
| MAX5812 | 12-Bit Low-Power, 2-Wire, Serial Voltage-Output DAC |
| MAX5812LEUT | 12-Bit Low-Power, 2-Wire, Serial Voltage-Output DAC |
| MAX5812MEUT | 12-Bit Low-Power, 2-Wire, Serial Voltage-Output DAC |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX5742AUB | 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 |
| MAX5742AUB+ | 功能描述:數(shù)模轉(zhuǎn)換器- DAC 12-Bit 4Ch 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 |
| MAX5742AUB+T | 功能描述:數(shù)模轉(zhuǎn)換器- DAC 12-Bit 4Ch 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 |
| MAX5742AUB-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 |
| MAX5742EUB | 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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