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參數(shù)資料
| 型號： | ADS1271EVM-PDK |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | modular EVM form factor |
| 中文描述： | 模塊化EVM的外形 |
| 文件頁數(shù)： | 25/29頁 |
| 文件大?。?/td> | 381K |
| 代理商： | ADS1271EVM-PDK |
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SBAS306A NOVEMBER 2004 REVISED DECEMBER 2004
www.ti.com
25
APPLICATION INFORMATION
To obtain the specified performance from the ADS1271,
the following layout and component guidelines should be
considered.
1.
Power Supplies: The device requires two power
supplies for operation: DVDD and AVDD. The allowed
range for DVDD is 1.65V to 3.6V, and AVDD is
restricted to 4.75V to 5.25V. Best performance is
achieved when DVDD = 1.8V. For both supplies, use
a 10
μ
F tantalum capacitor, bypassed with a 0.1
μ
F
ceramic capacitor, placed close to the device pins.
Alternatively, a single 10
μ
F ceramic capacitor can be
used. The supplies should be relatively free of noise
and should not be shared with devices that produce
voltage spikes (such as relays, LED display drivers,
etc.). If a switching power supply source is used, the
voltage ripple should be low (< 2mV). The power
supplies may be sequenced in any order.
2.
Ground Plane: A single ground plane connecting both
AGND and DGND pins can be used. If separate digital
and analog grounds are used, connect the grounds
together at the converter.
3.
Digital Inputs: It is recommended to source terminate
the digital inputs to the device with 50
series
resistors. The resistors should be placed close to the
driving end of digital source (oscillator, logic gates,
DSP, etc.) This helps to reduce ringing on the digital
lines, which may lead to degraded ADC performance.
4.
Analog/Digital Circuits: Place analog circuitry (input
buffer, reference) and associated tracks together,
keeping them away from digital circuitry (DSP,
microcontroller, logic). Avoid crossing digital tracks
across analog tracks to reduce noise coupling and
crosstalk.
5.
Reference Inputs: It is recommended to use a
minimum 10
μ
F tantalum with a 0.1
μ
F ceramic
capacitor directly across the reference inputs, REFP
and REFN. The reference input should be driven by a
low-impedance source. For best performance, the
reference should have less than 3
μ
V
RMS
broadband
noise. For references with noise higher than this,
external reference filtering may be necessary.
6.
Analog Inputs: The analog input pins must be driven
differentially to achieve specified performance. A true
differential driver or transformer (AC applications) can
be used for this purpose. Route the analog inputs
tracks (AINP, AINN) as a pair from the buffer to the
converter using short, direct tracks and away from
digital tracks.
A 1nF to 10nF capacitor should be used directly
across the analog input pins, AINP and AINN. A low-k
dielectric (such as COG or film type) should be used to
maintain low THD. Capacitors from each analog input
to ground should be used. They should be no larger
than 1/10 the size of the difference capacitor (typically
100pF) to preserve the AC common-mode
performance.
7.
Component Placement: Place the power supply,
analog input, and reference input bypass capacitors
as close as possible to the device pins. This is
particularly important for the small-value ceramic
capacitors.
Surface-mount
recommended to avoid the higher inductance of
leaded components.
components
are
Figure 60 to Figure 62 illustrate basic connections and
interfaces that can be used with the ADS1271.
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|---|---|
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| ADS1601IPFBT | 16-BIT 1.25MSPS ANALOG TO DIGITAL CONVERTER |
| ADS1602 | 16-Bit, 2.5MSPS Analog-to-Digital Converter |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| ADS1271IBPW | 功能描述:模數(shù)轉換器 - ADC 24B 105kSPS Indus Delta-Sigma ADC RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 結構:Sigma-Delta 轉換速率: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 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-32 |
| ADS1271IBPW | 制造商:Texas Instruments 功能描述:24BIT ADC 105KSPS DELTA S 16TSSOP 制造商:Texas Instruments 功能描述:24BIT ADC, 105KSPS, DELTA S, 16TSSOP 制造商:Texas Instruments 功能描述:24BIT ADC, 105KSPS, DELTA S, 16TSSOP; Resolution (Bits):24bit; Sampling Rate:105kSPS; Supply Voltage Type:Single; Supply Voltage Min:4.75V; Supply Voltage Max:5.25V; Supply Current:17mA; Digital IC Case Style:TSSOP; No. of Pins:16; ;RoHS Compliant: Yes |
| ADS1271IBPWG4 | 功能描述:模數(shù)轉換器 - ADC 24B 105kSPS Indus Delta-Sigma ADC RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 結構:Sigma-Delta 轉換速率: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 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-32 |
| ADS1271IBPWR | 功能描述:模數(shù)轉換器 - ADC 24B 105kSPS Indus Delta-Sigma ADC RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 結構:Sigma-Delta 轉換速率: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 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-32 |
| ADS1271IBPWRG4 | 功能描述:模數(shù)轉換器 - ADC 24B 105kSPS Indus Delta-Sigma ADC RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 結構:Sigma-Delta 轉換速率: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 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-32 |
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