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| 型号： | MAX5548ETE+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 14/15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 |
MAX5548
Detailed Description
Architecture
The MAX5548 8-bit, dual current-steering DAC (see the
Functional Diagram) operates with DAC update rates
up to 10Msps in SPI mode and 400ksps in I2C mode.
The converter consists of a 16-bit shift register and
input DAC registers, followed by a current-steering
array. The current-steering array generates full-scale
currents up to 30mA per DAC. An integrated +1.25V
bandgap reference, control amplifier, and an external
resistor determine each data converter’s full-scale
output range.
Reference Architecture and Operation
The MAX5548 provides an internal +1.25V bandgap ref-
erence or accepts an external reference voltage source
between +0.5V and +1.5V. REFIN serves as the input for
an external low-impedance reference source. Leave
REFIN unconnected in internal reference mode. Internal
or external reference mode is software selectable
through the SPI/I2C serial interface.
The MAX5548’s reference circuit (Figure 1) employs a
control amplifier to regulate the full-scale current (IFS)
for the current outputs of the DAC. This device has a
software-selectable full-scale current range (see the
command summary in Table 4). After selecting a cur-
rent range, an external resistor (RFSADJ_) sets the full-
scale current. See Table 1 for a matrix of IFS and
RFSADJ selections.
During startup, when the power is first applied, the
MAX5548 defaults to the external reference mode, and
to the 1mA–2mA full-scale current-range mode.
DAC Data
The 8-bit DAC data is decoded as offset binary, MSB
first, with 1 LSB = IFS / 256, and converted into the cor-
responding current as shown in Table 2.
Serial Interface
The MAX5548 features a pin-selectable SPI/I2C serial
interface. Connect SPI/I2C to GND to select I2C mode,
or connect SPI/I2C to VDD to select SPI mode. SDA
Dual, 8-Bit, Programmable, 30mA
High-Output-Current DAC
8
_______________________________________________________________________________________
Pin Description
PIN
NAME
FUNCTION
1
SCLK/SCL
Serial Clock Input. Connect SCL to VDD through a 2.4k
resistor in I2C mode.
2
DIN/SDA
Serial Data Input. Connect SDA to VDD through a 2.4k
resistor in I2C mode.
3
CS/A0
Chip-Select Input in SPI Mode/Address Select 0 in I2C Mode. CS is an active-low input. Connect A0 to
VDD or GND to set the device address in I2C mode.
4
SPI/I2C
SPI/I2C Select Input. Connect SPI/I2C to VDD to select SPI mode, or connect SPI/I2C to GND to select
I2C mode.
5
DOUT/A1
Serial Data Output in SPI Mode/Address Select 1 in I2C Mode. Use DOUT to daisy chain the MAX5548 to
other devices or to read back in SPI mode. The digital data is clocked out on SCLK’s falling edge.
Connect A1 to VDD or GND to set the device address in I2C mode.
6, 13, 15
N.C.
No Connection. Leave unconnected or connect to GND.
7
REFIN
Reference Input. Drive REFIN with an external reference source between +0.5V and +1.5V. Leave REFIN
unconnected in internal reference mode. Bypass REFIN with a 0.1F capacitor to GND as close to the
device as possible.
8, 16
GND
Ground
9
OUTB
DACB Output. OUTB provides up to 30mA of output current.
10
FSADJB
DACB Full-Scale Adjust Input. For maximum full-scale output current, connect a 20k
resistor between
FSADJB and GND. For minimum full-scale current, connect a 40k
resistor between FSADJB and GND.
11
FSADJA
DACA Full-Scale Adjust Input. For maximum full-scale output current, connect a 20k
resistor between
FSADJA and GND. For minimum full-scale current, connect a 40k
resistor between FSADJA and GND.
12
OUTA
DACA Output. OUTA provides up to 30mA of output current.
14
VDD
Power-Supply Input. Connect VDD to a +2.7 to +5.25V power supply. Bypass VDD to GND with a 0.1F
capacitor as close to the device as possible.
—
EP
Exposed Pad. Connect to GND. Do not use as a substitute ground connection.
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