參數(shù)資料
型號(hào)： MAX1180
廠商： Maxim Integrated Products, Inc.
英文描述： Dual 10-Bit, 105Msps, +3.3V, Low-Power ADC with Internal Reference and Parallel Outputs
中文描述： 雙路、10位、105Msps、3.3V、低功耗ADC，內(nèi)置電壓基準(zhǔn)及并行輸出
文件頁(yè)數(shù)： 16/20頁(yè)
文件大?。?/td> 573K
代理商： MAX1180
M
Dual 10-Bit, 105Msps, +3.3V, Low-Power ADC
with Internal Reference and Parallel Outputs
16
______________________________________________________________________________________
anced, and each of the ADC inputs only require 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.
Typical QAM Demodulation Application
The most frequently used modulation technique for dig-
ital communications application is the Quadrature
Amplitude Modulation (QAM). QAMs are typically found
in spread-spectrum based systems. A QAM signal rep-
resents a carrier frequency modulated in both ampli-
tude and phase. At the transmitter, modulating the
baseband signal with quadrature outputs, a local oscil-
lator followed by subsequent up-conversion can gener-
ate the QAM signal. The result is an in-phase (I) and a
quadrature (Q) carrier component, where the Q compo-
nent is 90 degrees phase-shifted with respect to the in-
phase component. At the receiver, the QAM signal is
divided down into its I and Q components, essentially
representing the modulation process reversed. Figure 8
displays the demodulation process performed in the
analog domain, using the dual-matched, +3V, 10-bit
ADCs, MAX1180 and the MAX2451 quadrature demod-
ulators, to recover and digitize the I and Q baseband
signals. Before being digitized by the MAX1180, the
mixed-down signal components may be filtered by
matched analog filters, such as Nyquist or Pulse-
Shaping filters which remove any unwanted images
from the mixing process, enhances the overall signal-
to-noise (SNR) performance, and minimizes intersym-
bol interference.
Grounding, Bypassing,
and Board Layout
The MAX1180 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
inductance. 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 separate ground and power planes, pro-
duce the highest level of signal integrity. Consider the
use of a split ground plane arranged to match the
physical location of the analog ground (GND) and the
digital output driver ground (OGND) on the ADCs pack-
age. The two ground planes should be joined at a sin-
gle point, such that the noisy digital ground currents do
not interfere with the analog ground plane. The ideal
location of this connection can be determined experi-
mentally at a point along the gap between the two
ground planes, which produces optimum results. Make
this connection with a low-value, surface-mount resistor
(1
to 5
), a ferrite bead, or a direct short.
Alternatively, all ground pins could share the same
ground plane, if the ground plane is sufficiently isolated
from any noisy, digital systems ground plane (e.g.,
downstream output buffer or DSP ground plane). Route
high-speed digital signal traces away from the sensitive
analog traces of either channel. Make sure to isolate
the analog input lines to each respective converter to
MAX1180
T1
N.C.
V
IN
6
1
5
2
4
3
22pF
22pF
0.1
μ
F
0.1
μ
F
2.2
μ
F
25
25
MINICIRCUITS
TT1
–
6
T1
N.C.
V
IN
6
1
5
2
4
3
22pF
22pF
0.1
μ
F
0.1
μ
F
2.2
μ
F
25
25
MINICIRCUITS
TT1
–
6
INA-
INA+
INB-
INB+
COM
Figure 6. Transformer-Coupled Input Drive
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MAX11800ETC/V+ 功能描述:觸摸屏轉(zhuǎn)換器和控制器 SPI 4Ch Touch Screen Controller RoHS:否 制造商:Microchip Technology 類型:Resistive Touch Controllers 輸入類型:3 Key 數(shù)據(jù)速率:140 SPS 分辨率:10 bit 接口類型:4-Wire, 5-Wire, 8-Wire, I2C, SPI 電源電壓:2.5 V to 5.25 V 電源電流:17 mA 工作溫度:- 40 C to + 85 C 封裝 / 箱體:SSOP-20
MAX11800ETC/V+T 功能描述:觸摸屏轉(zhuǎn)換器和控制器 SPI 4Ch Touch Screen Controller RoHS:否 制造商:Microchip Technology 類型:Resistive Touch Controllers 輸入類型:3 Key 數(shù)據(jù)速率:140 SPS 分辨率:10 bit 接口類型:4-Wire, 5-Wire, 8-Wire, I2C, SPI 電源電壓:2.5 V to 5.25 V 電源電流:17 mA 工作溫度:- 40 C to + 85 C 封裝 / 箱體:SSOP-20
MAX11800ETC+ 功能描述:觸摸屏轉(zhuǎn)換器和控制器 SPI 4Ch Touch Screen Controller RoHS:否 制造商:Microchip Technology 類型:Resistive Touch Controllers 輸入類型:3 Key 數(shù)據(jù)速率:140 SPS 分辨率:10 bit 接口類型:4-Wire, 5-Wire, 8-Wire, I2C, SPI 電源電壓:2.5 V to 5.25 V 電源電流:17 mA 工作溫度:- 40 C to + 85 C 封裝 / 箱體:SSOP-20
MAX11800ETC+T 功能描述:觸摸屏轉(zhuǎn)換器和控制器 SPI 4Ch Touch Screen Controller RoHS:否 制造商:Microchip Technology 類型:Resistive Touch Controllers 輸入類型:3 Key 數(shù)據(jù)速率:140 SPS 分辨率:10 bit 接口類型:4-Wire, 5-Wire, 8-Wire, I2C, SPI 電源電壓:2.5 V to 5.25 V 電源電流:17 mA 工作溫度:- 40 C to + 85 C 封裝 / 箱體:SSOP-20
MAX11800EVKIT+ 功能描述:顯示開發(fā)工具 MAX11800 Eval Kit RoHS:否 制造商:4D Systems 產(chǎn)品:4Display Shields 工具用于評(píng)估:?OLED-160-G1, ?OLED-160-G2 接口類型:Serial 工作電源電壓:5 V
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