參數(shù)資料
型號(hào)： MAX5820L
廠商： Maxim Integrated Products, Inc.
英文描述： Dual D-type Positive-Edge-Triggered Flip-Flops With Preset And C 14-CDIP -55 to 125
中文描述： 雙路，8位，低功耗，2線，串行電壓輸出DAC
文件頁(yè)數(shù)： 7/13頁(yè)
文件大?。?/td> 400K
代理商： MAX5820L
Detailed Description
The MAX5820 is a dual, 8-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, dual input and DAC registers, two 8-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 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 MAX5820 uses a segmented resistor string DAC
architecture, which saves power in the overall system
and guarantees output monotonicity. The MAX5820’s
input coding is straight binary, with the output voltage
given by the following equation:
where N = 8 (bits) and D = the decimal value of the
input code (0 to 255).
Output Buffer
The MAX5820 analog outputs are buffered by precision,
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 ±0.5 LSB within 4μs.
Power-On Reset
The MAX5820 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 MAX5820 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 MAX5820 features an I
2
C/SMBus-compatible 2-
wire interface consisting of a serial data line (SDA) and
a serial clock line (SCL). The MAX5820 is SMBus com-
patible within the range of V
DD
= 2.7V to 3.6V. SDA and
SCL facilitate bidirectional communication between the
MAX5820 and the master at rates up to 400kHz. Figure
1 shows the 2-wire interface timing diagram. The
MAX5820 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 MAX5820 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
bus is 8 bits long and is always followed by an
acknowledge clock pulse.
V
V
D
OUT
REF
2
N
_
=
×
M
Dual, 8-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
SMBus is a trademark of Intel Corporation.
相關(guān)PDF資料
PDF描述
MAX5820M Dual D-type Positive-Edge-Triggered Flip-Flops With Preset And C 20-LCCC -55 to 125
MAX5820 Dual D-type Positive-Edge-Triggered Flip-Flops With Preset And C 14-CFP -55 to 125
MAX5820LEUA Dual, 8-Bit, Low-Power, 2-Wire, Serial Voltage-Output DAC
MAX5821MEUA Dual, 10-Bit, Low-Power, 2-Wire, Serial Voltage-Output DAC
MAX5821 Dual D-type Positive-Edge-Triggered Flip-Flops With Preset And C 14-CDIP -55 to 125
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
MAX5820LEUA 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
MAX5820LEUA+ 功能描述:數(shù)模轉(zhuǎn)換器- DAC 8-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(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
MAX5820LEUA+T 功能描述:數(shù)模轉(zhuǎn)換器- DAC 8-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(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
MAX5820LEUA-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
MAX5820MEUA 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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