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参数资料
| 型号： | MAX5189BEEI+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 4/14页 |
| 文件大小： | 0K |
| 描述： | IC DAC 8BIT DUAL 40MHZ 28-QSOP |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 设置时间： | 25µs |
| 位数： | 8 |
| 数据接口： | 并联 |
| 转换器数目： | 2 |
| 电压电源： | 模拟和数字 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 28-SSOP（0.154"，3.90mm 宽） |
| 供应商设备封装： | 28-QSOP |
| 包装： | 带卷 (TR) |
| 输出数目和类型： | 4 电压，单极 |
| 采样率（每秒）： | * |
MAX5186/MAX5189
Dual, 8-Bit, 40MHz, Current/Voltage,
Simultaneous-Output DACs
12
______________________________________________________________________________________
REN
AGND
DGND
**MAX5186 ONLY
OUT1P
CREF2
CREF1
CLK
OUT1N
OUT2P
OUT2N
0.1
F
0.1
F
0.1
F
DVDD
AVDD AVDD
AVDD
RSET**
*400
RESISTORS INTERNAL TO MAX5189 ONLY.
MAX5186
MAX5189
10
F
3V
0.1
F
0.1
F
REFR
REFO
D0–D7
10
F
400
400
5V
-5V
402
402
402
402
*
OUTPUT 1
MAX4108
400
*
400
5V
-5V
402
402
402
402
OUTPUT 2
MAX4108
+
Figure 5. Differential to Single-Ended Conversion Using a Low-Distortion Amplifier
Differential to Single-Ended Conversion
The MAX4108 low-distortion, high-input bandwidth
amplifier may be used to generate a voltage from the
array current output of the MAX5186. The differential
voltage across OUT1P (or OUT2P) and OUT1N (or
OUT2N) is converted into a single-ended voltage by
designing an appropriate operational amplifier configu-
ration (Figure 5).
I/Q Reconstruction in a QAM Application
The MAX5186/MAX5189’s low distortion supports ana-
log reconstruction of in-phase (I) and quadrature (Q)
carrier components typically used in quadrature ampli-
tude modulation (QAM) architectures where I and Q
data are interleaved on a common data bus. A QAM
signal is both amplitude and phase modulated, created
by summing two independently modulated carriers of
identical frequency but different phase (90° phase dif-
ference).
In a typical QAM application (Figure 6), the modulation
occurs in the digital domain and the MAX5186/
MAX5189’s dual DACs may be used to reconstruct the
analog I and Q components.
The I/Q reconstruction system is completed by a quad-
rature modulator that combines the reconstructed I and
Q components with in-phase and quadrature carrier
frequencies and then sums both outputs to provide the
QAM signal.
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