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参数资料
| 型号： | MAX5548ETE+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 15/15页 |
| 文件大小： | 0K |
| 描述： | IC DAC 8BIT DUAL 30MA 16-TQFN |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 设置时间： | 30µs |
| 位数： | 8 |
| 数据接口： | I²C，串行，SPI? |
| 转换器数目： | 2 |
| 电压电源： | 单电源 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-WFQFN 裸露焊盘 |
| 供应商设备封装： | 16-TQFN（3x3） |
| 包装： | 带卷 (TR) |
| 输出数目和类型： | 2 电流，单极 |
| 采样率（每秒）： | 10M |
and SCL (I2C mode) and DIN, SCLK, and CS (SPI
mode) facilitate communication between the MAX5548
and the master. The serial interface remains active
in shutdown.
I2C Compatibility (SPI/
I2C = GND)
The MAX5548 is compatible with existing I2C systems
(Figure 2). SCL and SDA are high-impedance inputs;
SDA has an open-drain output that pulls the data line
low during the ninth clock pulse. SDA and SCL require
pullup resistors (2.4k
or greater) to VDD. Optional
resistors (24
) in series with SDA and SCL protect the
device inputs from high-voltage spikes on the bus lines.
Series resistors also minimize crosstalk and undershoot
of the bus signals. The communication protocol sup-
ports standard I2C 8-bit communications. The device’s
address is compatible with 7-bit I2C addressing proto-
col only. Ten-bit address formats are not supported.
Only write commands are accepted by the MAX5548.
Note: I2C readback is not supported.
Bit Transfer
One data bit transfers during each SCL rising edge.
The MAX5548 requires nine clock cycles to transfer
data into or out of the DAC register. The data on SDA
must remain stable during the high period of the SCL
clock pulse. Changes in SDA while SCL is high are
read as control signals (see the START and STOP
Conditions section). Both SDA and SCL idle high.
START and STOP Conditions
The master initiates a transmission with a START condi-
tion (S), (a high-to-low transition on SDA with SCL high).
The master terminates a transmission with a STOP con-
dition (P), (a low-to-high transition on SDA while SCL is
high) (Figure 3). A START condition from the master sig-
nals the beginning of a transmission to the MAX5548.
The master terminates transmission by issuing a STOP
condition. The STOP condition frees the bus.
If a repeated START condition (Sr) is generated instead
of a STOP condition, the bus remains active.
MAX5548
Dual, 8-Bit, Programmable, 30mA
High-Output-Current DAC
_______________________________________________________________________________________
9
+1.25V
REFERENCE
IFSADJ
RFSADJ
FSADJ_
OUT_
VDD
GND
CURRENT-SOURCE
ARRAY DAC
Figure 1. Reference Architecture and Output Current Adjustment
FULL-SCALE OUTPUT CURRENT (mA)*
RFSADJ (k
)
1mA–2mA
1.5mA–3mA
2.5mA–5mA
4.5mA–9mA
8mA–16mA
15mA–30mA
Calculated
1% EIA Std.
1.00
1.500
2.500
4.500
8.00
15.00
40
40.2
1.25
1.875
3.125
5.625
10.00
18.75
35
34.8
1.50
2.250
3.750
6.750
12.00
22.50
30
30.1
1.75
2.625
4.375
7.875
14.00
26.25
25
24.9
2.00
3.000
5.000
9.000
16.00
30.00
20
20.0
Table 1. Full-Scale Output Current and RFSADJ_ Selection Based on a +1.25V (typ)
Reference Voltage
*See the command summary in Table 4.
DAC CODE
IOUT_
1111 1111
1000 0000
0000 0001*
0000 0000
0
Table 2. DAC Output Code Table
255
256
×
I
FS
OS
||
128
256
×
I
FS
OS
||
256
I
FS
OS
||
*Negative output current values = 0.
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