参数资料
型号: MAX1304ECM/V+T
厂商: Maxim Integrated Products
文件页数: 20/37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: 2,000
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: 带卷 (TR)
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
______________________________________________________________________________________
27
Transfer Functions
Unipolar 0 to +5V Devices
Table 5 and Figure 12 show the offset binary transfer
function for the MAX1304/MAX1305/MAX1306 with a 0
to +5V input range. The full-scale input range (FSR) is
two times the voltage at REF. The internal +2.5V refer-
ence gives a +5V FSR, while an external +2V to +3V
reference allows an FSR of +4V to +6V, respectively.
Calculate the LSB size using:
which equals 1.22mV when using a 2.5V reference.
The input range is centered about VMSV, internally set
to +2.5V. For a custom midscale voltage, drive REFMS
with an external voltage source and MSV will follow
REFMS. Noise present on MSV or REFMS directly cou-
ples into the ADC result. Use a precision, low-drift volt-
age reference with adequate bypassing to prevent MSV
from degrading ADC performance. For maximum FSR,
do not violate the absolute maximum voltage ratings 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 - 2.500V
1
2
212
LSB
xVREF
=
Table 5. 0 to +5V Unipolar Code Table
BINARY
DIGITAL
OUTPUT CODE
DECIMAL
EQUIVALENT
DIGITAL OUTPUT
CODE
(CODE10)
INPUT VOLTAGE
(V)
VREF = +2.5V
VREFMS = +2.5V
1111 1111 1111
= 0xFFF
4095
+4.9994 ± 0.5 LSB
1111 1111 1110
= 0xFFE
4094
+4.9982 ± 0.5 LSB
1000 0000 0001
= 0x801
2049
+2.5018 ± 0.5 LSB
1000 0000 0000
= 0x800
2048
+2.5006 ± 0.5 LSB
0111 1111 1111
= 0x7FF
2047
+2.4994 ± 0.5 LSB
0000 0000 0001
= 0x001
1
+0.0018 ± 0.5 LSB
0000 0000 0000
= 0x000
0
+0.0006 ± 0.5 LSB
()
2 x VREF
2
12
1 LSB =
BINAR
Y
OUTPUT
CODE
02
1
3
4095
4093
0x0000
0x0001
0x0002
0x0003
0xFFF
0xFFE
0xFFD
0xFFC
0x7FF
0x800
0x801
2046
2048 2050
(MSV)
INPUT VOLTAGE (LSBs)
Figure 12. 0 to +5V Unipolar Transfer Function
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