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參數(shù)資料
| 型號： | MAX5821LEUA |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類： | DAC |
| 英文描述： | Dual, 10-Bit, Low-Power, 2-Wire, Serial Voltage-Output DAC |
| 中文描述： | SERIAL INPUT LOADING, 4 us SETTLING TIME, 10-BIT DAC, PDSO8 |
| 封裝： | MINIATURE, MICRO MAX PACKAGE-8 |
| 文件頁數(shù)： | 7/13頁 |
| 文件大?。?/td> | 419K |
| 代理商： | MAX5821LEUA |
Detailed Description
The MAX5821 is a dual, 10-bit, voltage-output DAC with
an I
2
C/SMBus-compatible 2-wire interface. The device
consists of a serial interface, power-down circuitry, dual
input and DAC registers, two 10-bit resistor string
DACs, two 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 regis-
ter, immediately updating the device output, 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 MAX5821 uses a segmented resistor string DAC
architecture, which saves power in the overall system
and guarantees output monotonicity. The MAX5821
’
s
input coding is straight binary, with the output voltage
given by the following equation:
where N = 10 (bits), and D = the decimal value of the
input code (0 to 1023).
Output Buffer
The MAX5821 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 MAX5821 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 MAX5821 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 ref-
erence current draw to less than 1μA. In power-down
mode 0, the device output is high impedance. 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 MAX5821 features an I
2
C/SMBus-compatible 2-
wire interface consisting of a serial data line (SDA) and
a serial clock line (SCL). The MAX5821 is SMBus com-
patible within the range of V
DD
= 2.7V to 3.6V. SDA and
SCL facilitate bidirectional communication between the
MAX5821 and the master at rates up to 400kHz. Figure
1 shows the 2-wire interface timing diagram. The
MAX5821 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 MAX5821 by
transmitting the proper address followed by command
and/or data words. Each transmit sequence is framed
by a START (S) or REPEATED START (S
r
) condition and
a STOP (P) condition. Each word transmitted over the
V
V
D
( )
OUT
REF
N
_
=
×
2
M
Dual, 10-Bit, Low-Power, 2-Wire, Serial
Voltage-Output DAC
_______________________________________________________________________________________
7
Pin Description
PIN
1
2
3
4
5
6
7
8
NAME
V
DD
GND
ADD
SCL
SDA
REF
OUTA
OUTB
FUNCTION
Power Supply
Ground
Address Select. A logic high sets the address LSB to 1; a logic low sets the address LSB to zero.
Serial Clock Input
Bidirectional Serial Data Interface
Reference Input
DAC A Output
DAC B Output
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| MAX5821LEUA+ | 功能描述:數(shù)模轉(zhuǎn)換器- DAC 10-Bit 2Ch 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 |
| MAX5821LEUA+T | 功能描述:數(shù)模轉(zhuǎn)換器- DAC 10-Bit 2Ch 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 |
| MAX5821LEUA-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 |
| MAX5821MEUA | 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 |
| MAX5821MEUA+ | 功能描述:數(shù)模轉(zhuǎn)換器- DAC 10-Bit 2Ch 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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