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參數資料
| 型號： | MAX5842MEUB |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類： | DAC |
| 英文描述： | Quad, 12-Bit, Low-Power, 2-Wire, Serial Voltage-Output DAC |
| 中文描述： | SERIAL INPUT LOADING, 4 us SETTLING TIME, 12-BIT DAC, PDSO10 |
| 封裝： | MINIATURE, MICRO MAX PACKAGE-10 |
| 文件頁數： | 8/15頁 |
| 文件大?。?/td> | 462K |
| 代理商： | MAX5842MEUB |
M
Quad, 12-Bit, Low-Power, 2-Wire, Serial
Voltage-Output DAC
8
_______________________________________________________________________________________
Detailed Description
The MAX5842 is a quad, 12-bit, voltage-output DAC
with an I
2
C/SMBus-compatible 2-wire interface. The
device consists of a serial interface, power-down cir-
cuitry, four input and DAC registers, four 12-bit resistor
string DACs, four unity-gain output buffers, and output
resistor networks. The serial interface decodes the
address and control bits, routing the data to the proper
input or DAC register. Data can be directly written to
the DAC register, immediately updating the device out-
put, or can be written to the input register without
changing the DAC output. Both registers retain data as
long as the device is powered.
DAC Operation
The MAX5842 uses a segmented resistor string DAC
architecture, which saves power in the overall system
and guarantees output monotonicity. The MAX5842
’
s
input coding is straight binary, with the output voltage
given by the following equation:
where N = 12 (bits), and D = the decimal value of the
input code (0 to 4095).
Output Buffer
The MAX5842 analog outputs are buffered by preci-
sion, unity-gain followers that slew 0.5V/μs. Each buffer
output swings rail-to-rail, and is capable of driving 5k
in parallel with 200pF. The output settles to ±0.5LSB
within 4μs.
Power-On Reset
The MAX5842 features an internal POR circuit that ini-
tializes the device upon power-up. The DAC registers
are set to zero scale and the device is powered down,
with the output buffers disabled and the outputs pulled
to GND through the 100k
termination resistor.
Following power-up, a wake-up command must be initi-
ated before any conversions are performed.
Power-Down Modes
The MAX5842 has three software-controlled, low-
power, power-down modes. All three modes disable
the output buffers and disconnect the DAC resistor
strings from REF, reducing supply current draw to 1μA
and the reference current draw to less than 1μA. In
power-down mode 0, the device output is high imped-
ance. In power-down mode 1, the device output is
internally pulled to GND by a 1k
termination resistor.
In power-down mode 2, the device output is internally
pulled to GND by a 100k
termination resistor. Table 1
shows the power-down mode command words.
Upon wake-up, the DAC output is restored to its previ-
ous value. Data is retained in the input and DAC regis-
ters during power-down mode.
Digital Interface
The MAX5842 features an I
2
C/SMBus-compatible
2-wire interface consisting of a serial data line (SDA)
and a serial clock line (SCL). The MAX5842 is SMBus
compatible within the range of V
DD
= 2.7V to 3.6V. SDA
and SCL facilitate bidirectional communication between
the MAX5842 and the master at rates up to 400kHz.
Figure 1 shows the 2-wire interface timing diagram. The
MAX5842 is a transmit/receive slave-only device, rely-
ing upon a master to generate a clock signal. The mas-
ter (typically a microcontroller) initiates data transfer on
the bus and generates SCL to permit that transfer.
A master device communicates to the MAX5842 by
transmitting the proper address followed by command
and/or data words. Each transmit sequence is framed
V
V
D
( )
OUT
REF
N
_
=
×
2
Pin Description
PIN
1
2
3
4
5
6
7
8
9
10
NAME
ADD
SCL
V
DD
GND
SDA
REF
OUTA
OUTB
OUTC
OUTD
FUNCTION
Address Select. A logic high sets the address LSB to 1; a logic low sets the address LSB to zero.
Serial Clock Input
Power Supply
Ground
Bidirectional Serial Data Interface
Reference Input
DAC A Output
DAC B Output
DAC C Output
DAC D Output
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相關代理商/技術參數 |
參數描述 |
|---|---|
| MAX5842MEUB+ | 功能描述:數模轉換器- DAC 12-Bit 4Ch Precision DAC RoHS:否 制造商:Texas Instruments 轉換器數量:1 DAC 輸出端數量:1 轉換速率: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 安裝風格:SMD/SMT 封裝 / 箱體:SOIC-14 封裝:Tube |
| MAX5842MEUB+T | 功能描述:數模轉換器- DAC 12-Bit 4Ch Precision DAC RoHS:否 制造商:Texas Instruments 轉換器數量:1 DAC 輸出端數量:1 轉換速率: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 安裝風格:SMD/SMT 封裝 / 箱體:SOIC-14 封裝:Tube |
| MAX5842MEUB-T | 功能描述:數模轉換器- DAC RoHS:否 制造商:Texas Instruments 轉換器數量:1 DAC 輸出端數量:1 轉換速率: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 安裝風格:SMD/SMT 封裝 / 箱體:SOIC-14 封裝:Tube |
| MAX5851ETL | 功能描述:數模轉換器- DAC RoHS:否 制造商:Texas Instruments 轉換器數量:1 DAC 輸出端數量:1 轉換速率: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 安裝風格:SMD/SMT 封裝 / 箱體:SOIC-14 封裝:Tube |
| MAX5851ETL+ | 功能描述:數模轉換器- DAC 8-Bit 2Ch 80Msps DAC RoHS:否 制造商:Texas Instruments 轉換器數量:1 DAC 輸出端數量:1 轉換速率: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 安裝風格:SMD/SMT 封裝 / 箱體:SOIC-14 封裝:Tube |
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