參數(shù)資料
型號： MAX1198EVKIT
廠商： Maxim Integrated Products
文件頁數(shù)： 8/22頁
文件大?。?/td> 0K
描述： EVAL KIT FOR MAX1198
產(chǎn)品培訓(xùn)模塊： Lead (SnPb) Finish for COTS
Obsolescence Mitigation Program
標(biāo)準包裝： 1
ADC 的數(shù)量： 2
位數(shù)： 8
采樣率（每秒）： 100M
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）： 264mW @ 100MSPS
工作溫度： 0°C ~ 70°C
已用 IC / 零件： MAX1195，1196，1197，1198
已供物品： 板
MAX1198
requirements. A reduced signal swing from the input
driver, such as an op amp, can also improve the overall
distortion.
In general, the MAX1198 provides better SFDR and
THD with fully differential input signals than single-
ended drive, especially for very high input frequencies.
In differential input mode, even-order harmonics are
lower as both inputs (INA+, INA- and/or INB+, INB-) are
balanced, and each of the ADC inputs only requires half
the signal swing compared to single-ended mode.
Single-Ended AC-Coupled Input Signal
Figure 7 shows an AC-coupled, single-ended applica-
tion. Amplifiers like the MAX4108 provide high speed,
high bandwidth, low noise, and low distortion to main-
tain the integrity of the input signal.
Buffered External Reference Drives
Multiple ADCs
Multiple-converter systems based on the MAX1198 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 gen-
erates an external DC level of 2.048V (Figure 8), and
exhibits a noise-voltage density of 150nV/
√Hz. Its out-
put passes through a 1-pole lowpass filter (with 10Hz
cutoff frequency) to the MAX4250, which buffers the
reference before its output is applied to a second 10Hz
lowpass filter. The MAX4250 provides a low offset volt-
age (for high gain accuracy) and a low noise level. The
passive 10Hz filter following the buffer attenuates noise
produced in the voltage reference and buffer stages.
This filtered noise density, which decreases for higher
frequencies, meets the noise levels specified for preci-
sion ADC operation.
Dual, 8-Bit, 100Msps, 3.3V, Low-Power ADC
with Internal Reference and Parallel Outputs
16
______________________________________________________________________________________
MAX1198
T1
N.C.
VIN
6
1
5
2
4
3
22pF
0.1
F
0.1
F
2.2
F
25
25
MINICIRCUITS
TT1–6-KK81
T1
N.C.
VIN
6
1
5
2
4
3
22pF
0.1
F
0.1
F
2.2
F
25
25
MINICIRCUITS
TT1-6-KK81
INA-
INA+
INB-
INB+
COM
MAX1198
0.1
F
1k
1k
100
100
CIN
22pF
CIN
22pF
INB+
INB-
COM
INA+
INA-
0.1
F
RISO
50
RISO
50
REFP
REFN
VIN
MAX4108
0.1
F
1k
1k
100
100
CIN
22pF
CIN
22pF
0.1
F
RISO
50
RISO
50
REFP
REFN
VIN
MAX4108
Figure 6. Transformer-Coupled Input Drive
Figure 7. Using an Op Amp for Single-Ended, AC-Coupled
Input Drive
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