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参数资料
| 型号： | MAX1148BEUP+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 11/25页 |
| 文件大小： | 0K |
| 描述： | IC ADC 14BIT 116KSPS 20-TSSOP |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 位数： | 14 |
| 采样率（每秒）： | 116k |
| 数据接口： | MICROWIRE?，QSPI?，串行，SPI? |
| 转换器数目： | 1 |
| 功率耗散（最大）： | 879mW |
| 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： | 20-TSSOP（0.173"，4.40mm 宽） |
| 供应商设备封装： | 20-TSSOP |
| 包装： | 带卷 (TR) |
| 输入数目和类型： | 8 个单端，单极；8 个单端，双极；4 个差分，单极；4 个差分，双极 |
MAX1146–MAX1149
Multichannel, True-Differential,
Serial, 14-Bit ADCs
______________________________________________________________________________________
19
Method 1 allows the direct application of an external
reference from 1.5V to VDD + 50mV. The REF input
impedance is typically 10k
. During conversion, an
external reference at REF must deliver up to 210A and
have an output impedance less than 10
. Bypass REF
with a 0.1F capacitor to AGND to improve its output
impedance.
Method 2 utilizes the internal reference buffer to reduce
the external reference load. The REFADJ input imped-
ance is typically 20k
. During a conversion, an external
reference at REFADJ must deliver at least 100A and
have an output impedance less than 100
. The
MAX1146/MAX1148 reference buffer has a 3.277V/V
gain and the MAX1147/MAX1149 has a gain of
2.000V/V. The external reference voltage at REFADJ
multiplied by the reference buffer gain is the SAR ADC
reference voltage. This reference appears at REF and
must be from 1.5V to VDD + 50mV. Bypass REFADJ
with a 0.01F capacitor and bypass REF with a 2.2F
capacitor to AGND.
Transfer Function
Table 7 shows the full-scale voltage ranges for unipolar
and bipolar modes.
Output data coding for the MAX1146–MAX1149 is bina-
ry in unipolar mode and two’s complement binary in
bipolar mode with 1 LSB = (VREF/2N), where N is the
number of bits (14). Code transitions occur halfway
between successive-integer LSB values. Figure 14 and
Figure 15 show the input/output (I/O) transfer functions
for unipolar and bipolar operations, respectively.
Serial Interfaces
The MAX1146–MAX1149 feature a serial interface that
is fully compatible with SPI, QSPI, and MICROWIRE. If a
serial interface is available, establish the CPU’s serial
interface as a master, so that the CPU generates the
serial clock for the ADCs. Select a clock frequency up
to 2.1MHz.
SPI and MICROWIRE Interface
When using an SPI (Figure 16a) or MICROWIRE interface
(Figure 16b), set CPOL = CPHA = 0. Two 8-bit readings
are necessary to obtain the entire 14-bit result from the
ADC. DOUT data transitions on the serial clock’s falling
MAX1146–
MAX1149
MAX6163
1.250V
BANDGAP
REFERENCE
20k
SAR
ADC
REF
REFERENCE
BUFFER
DISABLED
DGND
VDD
0.1
F
0.1
F
+5V
OUT
IN
GND
+5V
3.000V
AGND
REFADJ
REF
Figure 12. External Reference Applied to REF
MAX1146–
MAX1149
0.047
F
510k
24k
100k
+3.3V
REFADJ
Figure 13. Reference Adjust Circuit
UNIPOLAR MODE
BIPOLAR MODE
INPUT AND OUTPUT
MODES
ZERO SCALE
FULL SCALE
NEGATIVE FULL
SCALE
ZERO SCALE
POSITIVE FULL
SCALE
Single-Ended Mode
VCOM
VREF + VCOM
VCOM
Differential Mode
VIN-
VREF + VIN-
VIN-
Table 7. Full Scale and Zero Scale
Note: The common mode range for the analog inputs is from AGND to VDD.
+
V
REF
COM
2
+
V
REF
IN
2
+
V
REF
COM
2
+
V
REF
IN
2
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX1148CGP | 制造商:Maxim Integrated Products 功能描述:MULTICHANNEL, TRUE-DIFFERENTIAL, SERIAL, 14-B - Rail/Tube |
| MAX1148CUP | 制造商:Maxim Integrated Products 功能描述:MULTICHANNEL, TRUE-DIFFERENTIAL, SERIAL, 14-B - Rail/Tube |
| MAX1148EGP | 制造商:Maxim Integrated Products 功能描述:MULTICHANNEL, TRUE-DIFFERENTIAL, SERIAL, 14-B - Rail/Tube |
| MAX1148EUP | 制造商:Maxim Integrated Products 功能描述:MULTICHANNEL, TRUE-DIFFERENTIAL, SERIAL, 14-B - Rail/Tube |
| MAX1149 | 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:Multichannel, True-Differential, Serial, 14-Bit ADCs |
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