参数资料
型号: MAX1304ECM/V+
厂商: Maxim Integrated Products
文件页数: 22/37页
文件大小: 0K
描述: IC ADC 12BIT 4000KSPS 8CH 48LQFP
产品培训模块: Lead (SnPb) Finish for COTS
Obsolescence Mitigation Program
标准包装: 250
位数: 12
采样率(每秒): 3.65M
数据接口: 并联
转换器数目: 1
功率耗散(最大): 1.82W
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: 48-LQFP
供应商设备封装: 48-LQFP(7x7)
包装: 管件
输入数目和类型: 8 个单端,单极
MAX1304–MAX1306/MAX1308–MAX1310/MAX1312–MAX1314
8-/4-/2-Channel, 12-Bit, Simultaneous-Sampling ADCs
with ±10V, ±5V, and 0 to +5V Analog Input Ranges
______________________________________________________________________________________
29
Bipolar ±10V Devices
Table 7 and Figure 14 show the two’s complement trans-
fer function for the ±10V input range MAX1312/
MAX1313/MAX1314. The FSR is eight times the voltage at
REF. The internal +2.5V reference gives a +20V FSR,
while an external +2V to +3V reference allows an FSR of
+16V to +24V, respectively. Calculate the LSB size using:
which equals 4.88mV with a +2.5V reference.
The input range is centered about VMSV. Normally,
MSV = AGND, and the input is symmetrical about zero.
For a custom midscale voltage, drive MSV with an
external voltage source. Noise present on MSV directly
couples into the ADC result. Use a precision, low-drift
voltage reference with adequate bypassing to prevent
MSV from degrading ADC performance. For maximum
FSR, do not violate the absolute maximum voltage rat-
ings of the analog inputs when choosing MSV.
Determine the input voltage as a function of VREF,
VMSV, and the output code in decimal using:
VCH_ = LSB x CODE10 + VMSV
1
8
212
LSB
xVREF
=
Table 7. ±10V Bipolar Code Table
TWO’s
COMPLEMENT
DIGITAL OUTPUT
CODE
DECIMAL
EQUIVALENT
DIGITAL OUTPUT
CODE
(CODE10)
INPUT VOLTAGE
(V)
VREF = +2.5V
VMSV = 0V
0111 1111 1111 =
0x7FF
+2047
+9.9976 ±0.5 LSB
0111 1111 1110 =
0x7FE
+2046
+9.9927 ±0.5 LSB
0000 0000 0001 =
0x001
+1
+0.0073 ±0.5 LSB
0000 0000 0000 =
0x000
0
0.0024 ±0.5 LSB
1111 1111 1111 =
0xFFF
-1
-0.0024 ±0.5 LSB
1000 0000 0001 =
0x801
-2047
-9.9927 ±0.5 LSB
1000 0000 0000 =
0x800
-2048
-9.9976 ±0.5 LSB
()
8 x VREF
2
12
1 LSB =
TWO'S
COMPLEMENT
BINAR
Y
OUTPUT
CODE
-2048 -2046
+2047
+2045
0x800
0x801
0x802
0x803
0x7FF
0x7FE
0x7FD
0x7FC
0xFFF
0x000
0x001
-1 0 +1
(MSV)
INPUT VOLTAGE (VCH_ - VMSV IN LSBs)
Figure 14. ±10V Bipolar Transfer Function
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