參數資料
型號: MAX1304ECM+T
廠商: Maxim Integrated Products
文件頁數: 20/37頁
文件大?。?/td> 0K
描述: IC ADC 12BIT 8CH 4MSPS 48LQFP
產品培訓模塊: Lead (SnPb) Finish for COTS
Obsolescence Mitigation Program
標準包裝: 2,000
位數: 12
采樣率(每秒): 3.65M
數據接口: 并聯(lián)
轉換器數目: 1
功率耗散(最大): 1.82W
電壓電源: 模擬和數字
工作溫度: -40°C ~ 85°C
安裝類型: 表面貼裝
封裝/外殼: 48-LQFP
供應商設備封裝: 48-LQFP(7x7)
包裝: 帶卷 (TR)
輸入數目和類型: 8 個單端,單極
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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