參數(shù)資料
型號(hào): MAX1448EVKIT
廠商: Maxim Integrated Products
文件頁(yè)數(shù): 8/21頁(yè)
文件大?。?/td> 0K
描述: EVAL KIT FOR MAX1448
產(chǎn)品培訓(xùn)模塊: Lead (SnPb) Finish for COTS
Obsolescence Mitigation Program
標(biāo)準(zhǔn)包裝: 1
ADC 的數(shù)量: 1
位數(shù): 10
采樣率(每秒): 80M
數(shù)據(jù)接口: 并聯(lián)
輸入范圍: ±1 V
在以下條件下的電源(標(biāo)準(zhǔn)): 120mW @ 80MSPS
工作溫度: 0°C ~ 70°C
已用 IC / 零件: MAX1448
已供物品:
MAX1448
10-Bit, 80Msps, Single 3.0V, Low-Power
ADC with Internal Reference
16
______________________________________________________________________________________
Buffered External Reference
Drives Multiple ADCs
Multiple-converter systems based on the MAX1448 are
well suited for use with a common reference voltage.
The REFIN pin of those converters can be connected
directly to an external reference source. A precision
bandgap reference like the MAX6062 generates an
external DC level of 2.048V (Figure 10), and exhibits a
noise voltage density of 150nV/√Hz. Its output passes
through a 1-pole lowpass filter (with 10Hz cutoff fre-
quency) to the MAX4250, which buffers the reference
before its output is applied to a second 10Hz lowpass
filter. The MAX4250 provides a low offset voltage (for
high-gain accuracy) and a low noise level. The passive
10Hz filter following the buffer attenuates noise pro-
duced in the voltage reference and buffer stages. This
filtered noise density, which decreases for higher fre-
quencies, meets the noise levels specified for precision
ADC operation.
REFOUT
29
N.C.
REFIN
31
REFP
32
REFN
1
COM
2
0.1F
2.048V
100F
2
5
3
2
3
1
4
1
MAX1448
N = 1
MAX4250
REFOUT
29
N.C.
REFIN
31
REFP
32
REFN
1
COM
2
0.1F
MAX1448
N = 1000
0.1F
162
16.2k
3.3V
1F
10Hz LOWPASS
FILTER
10Hz LOWPASS
FILTER
NOTE: ONE FRONT-END REFERENCE CIRCUIT DESIGN MAY BE USED WITH UP TO 1000 ADCs.
2.2F
10V
0.1F
3.3V
MAX6062
Figure 10. Buffered External Reference Drives Up to 1000 ADCs
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