參數(shù)資料
型號(hào)： MAX1449
廠商： Maxim Integrated Products, Inc.
元件分類： 溫度/濕度傳感器
英文描述： 1C Remote and Local TEMPERATURE SENSOR with N-Factor and Series Resistance Correction 16-SSOP/QSOP -40 to 125
中文描述： 10位、105Msps、單路+3.3V、低功耗ADC，內(nèi)置電壓基準(zhǔn)
文件頁(yè)數(shù)： 13/18頁(yè)
文件大?。?/td> 603K
代理商： MAX1449
M
10-Bit, 105Msps, Single +3.3V, Low-Power
ADC with Internal Reference
______________________________________________________________________________________
13
Using Transformer Coupling
An RF transformer (Figure 8) provides an excellent
solution to convert a single-ended source signal to a
fully differential signal, required by the MAX1449 for
optimum performance. Connecting the center tap of the
transformer to COM provides a V
DD
/2 DC level shift to
the input. Although a 1:1 transformer is shown, a step-
up transformer may be selected to reduce the drive
requirements. A reduced signal swing from the input
driver, such as an op amp, may also improve the over-
all distortion.
In general, the MAX1449 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 (IN+, IN-) are balanced, and each
of the inputs only requires half the signal swing com-
pared to single-ended mode.
Single-Ended AC-Coupled Input Signal
Figure 9 shows an AC-coupled, single-ended applica-
tion. The MAX4108 op amp provides high speed, high
bandwidth, low-noise, and low-distortion to maintain the
integrity of the input signal.
Grounding, Bypassing
and Board Layout
The MAX1449 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. Multi-layer
boards with separated ground and power planes pro-
duce the highest level of signal integrity. Consider
OUTPUT
DATA D9
–
D0
OE
t
DISABLE
t
ENABLE
HIGH-Z
HIGH-Z
VALID DATA
Figure 5. Output Enable Timing
N - 6
N
N - 5
N + 1
N - 4
N + 2
N - 3
N + 3
N - 2
N + 4
N - 1
N + 5
N
N + 6
N + 1
5.5 CLOCK-CYCLE LATENCY
ANALOG INPUT
CLOCK INPUT
DATA OUTPUT
t
D0
t
CH
t
CL
Figure 6. System and Output Timing Diagram
相關(guān)PDF資料
PDF描述
MAX1449EHJ Analog-to-Digital Converter， 10-Bit
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
MAX1449EHJ 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
MAX1449EHJ+ 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 10-Bit 105Msps 3V High Speed 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
MAX1449EHJ+T 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 10-Bit 105Msps 3V High Speed 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
MAX1449EHJ-T 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
MAX144ACPA 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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