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參數(shù)資料
| 型號： | MAX1191 |
| 廠商： | Maxim Integrated Products, Inc. |
| 元件分類： | ADC |
| 英文描述： | Ultra-Low-Power, 7.5Msps, Dual 8-Bit ADC |
| 中文描述： | 超低功耗、7.5Msps、雙路、8位ADC |
| 文件頁數(shù)： | 20/27頁 |
| 文件大小： | 492K |
| 代理商： | MAX1191 |
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Ultra-Low-Power, 7.5Msps, Dual 8-Bit ADC
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______________________________________________________________________________________
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 MAX1191 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 can be selected to reduce the drive
requirements. A reduced signal swing from the input
driver, such as an op amp, can also improve the overall
distortion.
In general, the MAX1191 provides better SFDR and
THD with fully differential input signals than single-
ended drive, especially for high input frequencies. In
differential input mode, even-order harmonics are lower
as both inputs (INA+, INA- and/or INB+, INB-) are bal-
anced, and each of the ADC inputs only requires half
the signal swing compared to single-ended mode.
Single-Ended AC-Coupled Input Signal
Figure 9 shows an AC-coupled, single-ended applica-
tion. Amplifiers such as the MAX4108 provide high
speed, high bandwidth, low noise, and low distortion to
maintain the input signal integrity.
Buffered External Reference Drives
Multiple ADCs
The buffered external reference mode allows for more
control over the MAX1191 reference voltage and allows
multiple converters to use a common reference. To
drive one MAX1191 in buffered external reference
mode, the external circuit must sink 0.7μA, allowing one
reference circuit to easily drive the REFIN of multiple
converters to 1.024V ±10%.
MAX1191
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-KK81
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-KK81
INA-
INA+
INB-
INB+
COM
Figure 8. Transformer-Coupled Input Drive
MAX1191
0.1
μ
F
1k
1k
100
100
C
IN
22pF
C
IN
22pF
INB+
INB-
COM
INA+
INA-
0.1
μ
F
R
ISO
50
R
ISO
50
REFP
REFN
V
IN
MAX4108
0.1
μ
F
1k
1k
100
100
C
IN
22pF
C
IN
22pF
0.1
μ
F
R
ISO
50
R
ISO
50
REFP
REFN
V
IN
MAX4108
Figure 9. Using an Op Amp for Single-Ended, AC-Coupled
Input Drive
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| MAX1191ETI-T | Ultra-Low-Power, 7.5Msps, Dual 8-Bit ADC |
| MAX1198 | Dual, 8-Bit, 100Msps, 3.3V, Low-Power ADC with Internal Reference and Parallel Outputs |
| MAX1198ECM | Dual, 8-Bit, 100Msps, 3.3V, Low-Power ADC with Internal Reference and Parallel Outputs |
| MAX1200 | +5v sINGLE-sUPPLY, 1mSPS, 16-bIT sELF-cALIBRATING adc |
| MAX1200AEMH | +5v sINGLE-sUPPLY, 1mSPS, 16-bIT sELF-cALIBRATING adc |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX1191ETI | 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 |
| MAX1191ETI+ | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 8-Bit 2Ch 7.5Msps 3.6V Precision 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 |
| MAX1191ETI+T | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 8-Bit 2Ch 7.5Msps 3.6V Precision 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 |
| MAX1191ETI-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 |
| MAX1192ETI | 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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