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參數(shù)資料
| 型號(hào)： | MAX1190ECM |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類： | ADC |
| 英文描述： | Dual 10-Bit, 120Msps, 3.3V, Low-Power ADC with Internal Reference and Parallel Outputs |
| 中文描述： | DUAL 1-CH 10-BIT FLASH METHOD ADC, PARALLEL ACCESS, PQFP48 |
| 封裝： | 7 X 7 MM, 1.0 MM HEIGHT, MS-026ABA-HD, TQFP-48 |
| 文件頁數(shù)： | 17/21頁 |
| 文件大?。?/td> | 739K |
| 代理商： | MAX1190ECM |
Typical QAM Demodulation Application
A frequently used modulation technique in digital com-
munications applications is quadrature amplitude modu-
lation (QAM). Typically found in spread-spectrum-based
systems, a QAM signal represents a carrier frequency
modulated in both amplitude and phase. At the transmit-
ter, modulating the baseband signal with quadrature
outputs, a local oscillator followed by subsequent
upconversion can generate the QAM signal. The result
is an in-phase (I) and a quadrature (Q) carrier compo-
nent, where the Q component is 90
°
phase shifted with
respect to the in-phase component. At the receiver, the
QAM signal is divided down into its I and Q compo-
nents, essentially representing the modulation process
reversed. Figure 10 displays the demodulation process
performed in the analog domain, using the dual-
matched 3.3V, 10-bit ADC MAX1190 and the MAX2451
quadrature demodulator to recover and digitize the I
and Q baseband signals. Before being digitized by the
MAX1190, the mixed-down signal components can be
filtered by matched analog filters, such as Nyquist or
pulse-shaping filters, which remove unwanted images
from the mixing process, thereby enhancing the overall
SNR performance and minimizing intersymbol interfer-
ence.
Grounding, Bypassing, and
Board Layout
The MAX1190 requires high-speed board layout design
techniques. Locate all bypass capacitors as close to the
device as possible, preferably on the same side as the
ADC, using surface-mount devices for minimum induc-
tance. Bypass V
DD
, REFP, REFN, and COM with two
parallel 0.1μF ceramic capacitors and a 2.2μF bipolar
capacitor to GND. Follow the same rules to bypass the
digital supply (OV
DD
) to OGND. Multilayer boards with
separated ground and power planes produce the
M
Dual 10-Bit, 120Msps, 3.3V, Low-Power ADC
with Internal Reference and Parallel Outputs
______________________________________________________________________________________
17
MAX4250
MAX6062
16.2k
162
3.3V
2
4
2
3
5
10Hz LOWPASS
FILTER
10Hz LOWPASS
FILTER
1
1
REFOUT
REFP
REFN
REFIN
1
μ
F
MAX1190
N = 1
29
N.C.
2.048V
N.C.
31
32
1
2
29
31
32
1
2
COM
REFOUT
NOTE:
ONE FRONT-END REFERENCE CIRCUIT DESIGN MAY BE USED WITH UP TO 1000 ADCs.
REFP
REFN
REFIN
MAX1190
N = 1000
COM
3
0.1
μ
F
0.1
μ
F
3.3V
0.1
μ
F
0.1
μ
F
0.1
μ
F
0.1
μ
F
0.1
μ
F
2.2
μ
F
10V
0.1
μ
F
0.1
μ
F
0.1
μ
F
100
μ
F
0.1
μ
F
Figure 8. External Buffered (MAX4250) Reference Drive Using a MAX6062 Bandgap Reference
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX1190ECM+ | 制造商:Maxim Integrated Products 功能描述:IC SM ADC LOW POWER 10-BIT DUAL |
| MAX1190ECM+D | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 10Bit 2Ch 120Msps 3.3V Low-Power ADC RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 結(jié)構(gòu):Sigma-Delta 轉(zhuǎn)換速率:125 SPs to 8 KSPs 分辨率:24 bit 輸入類型:Differential 信噪比:107 dB 接口類型:SPI 工作電源電壓:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-32 |
| MAX1190ECM+TD | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 10Bit 2Ch 120Msps 3.3V Low-Power ADC RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 結(jié)構(gòu):Sigma-Delta 轉(zhuǎn)換速率:125 SPs to 8 KSPs 分辨率:24 bit 輸入類型:Differential 信噪比:107 dB 接口類型:SPI 工作電源電壓:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-32 |
| MAX1190ECM-D | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 結(jié)構(gòu):Sigma-Delta 轉(zhuǎn)換速率:125 SPs to 8 KSPs 分辨率:24 bit 輸入類型:Differential 信噪比:107 dB 接口類型:SPI 工作電源電壓:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-32 |
| MAX1190ECM-TD | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 結(jié)構(gòu):Sigma-Delta 轉(zhuǎn)換速率:125 SPs to 8 KSPs 分辨率:24 bit 輸入類型:Differential 信噪比:107 dB 接口類型:SPI 工作電源電壓:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-32 |
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