參數(shù)資料
型號(hào): MAX1304ECM/V+T
廠商: Maxim Integrated Products
文件頁(yè)數(shù): 22/37頁(yè)
文件大?。?/td> 0K
描述: IC ADC 12BIT 4000KSPS 8CH 48LQFP
產(chǎn)品培訓(xùn)模塊: Lead (SnPb) Finish for COTS
Obsolescence Mitigation Program
標(biāo)準(zhǔn)包裝: 2,000
位數(shù): 12
采樣率(每秒): 3.65M
數(shù)據(jù)接口: 并聯(lián)
轉(zhuǎn)換器數(shù)目: 1
功率耗散(最大): 1.82W
電壓電源: 模擬和數(shù)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(yīng)商設(shè)備封裝: 48-LQFP(7x7)
包裝: 帶卷 (TR)
輸入數(shù)目和類型: 8 個(gè)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
______________________________________________________________________________________
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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