参数资料
型号: MAX5380MEUK+T
厂商: Maxim Integrated Products
文件页数: 2/12页
文件大小: 0K
描述: IC DAC 8BIT 2WIRE SER SOT23-5
产品培训模块: Lead (SnPb) Finish for COTS
Obsolescence Mitigation Program
标准包装: 1
设置时间: 20µs
位数: 8
数据接口: 串行
转换器数目: 1
电压电源: 单电源
功率耗散(最大): 571mW
工作温度: -40°C ~ 85°C
安装类型: 表面贴装
封装/外壳: SC-74A,SOT-753
供应商设备封装: SOT-23-5
包装: 标准包装
输出数目和类型: 1 电压,单极
采样率(每秒): *
产品目录页面: 1397 (CN2011-ZH PDF)
其它名称: MAX5380MEUK+TDKR
MAX5380/MAX5381/MAX5382
device, followed by the MAX5380/MAX5381/MAX5382s’
preset slave address, a power-mode bit, the DAC data,
and finally, a STOP condition (Figure 6). The bus is then
free for another transmission.
SDA’s state is sampled and therefore must remain sta-
ble while SCL is high. Data is transmitted in 8-bit bytes.
Nine clock cycles are required to transfer each byte to
the MAX5380/MAX5381/MAX5382. Release SDA during
the 9th clock cycle since the selected device acknowl-
edges receipt of the byte by pulling SDA low during
this time. A series resistor on the SDA line may be
needed if the master’s output is forced high while the
selected device acknowledges (Figure 4).
Slave Address
The MAX5380/MAX5381/MAX5382 are available with
one of four preset slave addresses. Each address
option is identified by the suffix L, M, N, or P added to
the part number. The address is defined as the 7MSBs
sent by the master after a START condition. The
address options are 0x60, 0x62, 0x64, 0x66 (left justi-
fied with LSB set to 0). The 8th bit, typically used to
define a write or read protocol, sets the device’s power
mode (SHDN). The device is powered-down when
SHDN is set to one. During a device search routine, the
MAX5380/MAX5381/MAX5382 acknowledge both
options (SHDN = 0 or SHDN = 1), but do not change
their power state if a stop condition (or restart) is issued
immediately. The second byte (DAC data) must be
sent/received for the device to update both power
mode and DAC output.
DAC Data
The 8-bit DAC data is decoded as straight binary MSB
first with 1LSB = VREF / 256 and converted into the cor-
responding analog voltage as shown in Table 1. After
receiving the data byte, the devices acknowledge its
receipt and expect a STOP condition, at which point
the DAC output is updated.
The MAX5380/MAX5381/MAX5382 update the output
and the power mode only if the second byte is clocked
in (SHDN = 0) or out (SHDN = 1) of the device. When
SHDN = 1, the master will read all ones when clocking
out a data byte. The MAX5380/MAX5381/MAX5382 do
not drive SDA except for the acknowledge bit.
I2C Compatibility
The MAX5380/MAX5381/MAX5382 are compatible with
existing I2C systems. SCL and SDA are high-imped-
ance inputs; SDA has an open drain that pulls the data
line low during the 9th clock pulse. Figure 7 shows a
typical I2C application. The communication protocol
supports standard I2C 8-bit communications. The gen-
eral call address is ignored, and CBUS formats are not
supported. The devices’ address is compatible with the
7-bit I2C addressing protocol only. No 10-bit formats
Low-Cost, Low-Power, 8-Bit DACs with
2-Wire Serial Interface in SOT23
10
______________________________________________________________________________________
*SEE ORDERING INFORMATION.
SDA
START
CONDITION
STOP
CONDITION
9
8
10
18
1
17
ACK
LSB
MSB
LSB
MSB
0
1
0
A1
0
A2
ACK
SHDN
D7
D5
D6
D4
D2
D3
D1
D0
SLAVE ADDRESS BYTE
DAC CODE
*
A1 A2
0
L
0
1
M
1
0
N
11
P
Figure 6. A Complete Serial Transmission
SCL
SDA
START CONDITION
STOP CONDITION
Figure 5. START and STOP Conditions
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