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參數(shù)資料
| 型號： | ADS1602 |
| 英文描述： | 16-Bit, 2.5MSPS Analog-to-Digital Converter |
| 中文描述： | 16位2.5MSPS模擬到數(shù)字轉換器 |
| 文件頁數(shù)： | 15/26頁 |
| 文件大?。?/td> | 397K |
| 代理商： | ADS1602 |
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SBAS341B DECEMBER 2004 REVISED APRIL 2005
www.ti.com
15
OVERVIEW
The ADS1602 is a high-performance delta-sigma ADC.
The modulator uses an inherently stable 2-1-1 multi-stage
architecture incorporating proprietary circuitry that allows
for very linear high-speed operation. The modulator
samples the input signal at 40MSPS (when f
CLK
= 40MHz).
A low-ripple linear phase digital filter decimates the
modulator output by 16 to provide high resolution 16-bit
output data.
Conceptually, the modulator and digital filter measure the
differential input signal, V
IN
= (AINP – AINN), against the
scaled differential reference, V
REF
= (VREFP – VREFN),
as shown in Figure 38. The voltage reference can either be
generated internally or supplied externally. A 3-wire serial
interface, designed for direct connection to DSPs, outputs
the data. A separate power supply for the I/O allows flexi-
bility for interfacing to different logic families. Out-of-range
conditions are indicated with a dedicated digital output pin.
Analog power dissipation is controlled using an external
resistor. This control allows reduced dissipation when op-
erating at slower speeds. When not in use, power con-
sumption can be dramatically reduced by setting the PD
pin low to enter Power-Down mode.
ANALOG INPUTS (AINP, AINN)
The ADS1602 measures the differential signal,
V
IN
= (AINP – AINN), against the differential reference,
V
REF
= (VREFP – VREFN). The most positive measurable
differential input is V
REF
, which produces the most positive
digital output code of 7FFFh. Likewise, the most negative
measurable differential input is –V
REF
, which produces the
most negative digital output code of 8000h.
The ADS1602 supports a very wide range of input signals.
For V
REF
= 3V, the full-scale input voltages are
±
3V.
Having such a wide input range makes out-of-range
signals unlikely. However, should an out-of-range signal
occur, the digital output OTR will go high.
The analog inputs must be driven with a differential signal
to achieve optimum performance. For the input signal:
AINP
AINN
2
the recommended common-mode voltage is 1.5V. In
addition to the differential and common-mode input
voltages, the absolute input voltage is also important. This
is the voltage on either input (AINP or AINN) with respect
to AGND. The range for this voltage is:
V
CM
0.1V
(AINN or AINP)
4.6V
If either input is taken below –0.1V, ESD protection diodes
on the inputs will turn on. Exceeding 4.6V on either input
will result in degradation in the linearity performance. ESD
protection diodes will also turn on if the inputs are taken
above AVDD (+5V).
The recommended absolute input voltage is:
0.1V
(AINN or AINP)
4.2V
Keeping the inputs within this range provides for optimum
performance.
Σ
Modulator
Digital
Filter
Serial
Interface
Σ
V
IN
VREFN
IOVDD
VREFP
V
REF
Σ
AINP
AINN
FSO
FSO
SCLK
SCLK
DOUT
DOUT
CLK
Figure 38. Conceptual Block Diagram
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| ADS1602IPFBRG4 | 16-Bit, 2.5MSPS Analog-to-Digital Converter |
| ADS1602IPFBT | 16-Bit, 2.5MSPS Analog-to-Digital Converter |
| ADS1602IPFBTG4 | 16-Bit, 2.5MSPS Analog-to-Digital Converter |
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| ADS1602EVM | 功能描述:數(shù)據(jù)轉換 IC 開發(fā)工具 ADS1602EVM Eval Mod RoHS:否 制造商:Texas Instruments 產(chǎn)品:Demonstration Kits 類型:ADC 工具用于評估:ADS130E08 接口類型:SPI 工作電源電壓:- 6 V to + 6 V |
| ADS1602IPFBR | 功能描述:模數(shù)轉換器 - ADC 16-Bit 2.5MSPS 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 |
| ADS1602IPFBRG4 | 功能描述:模數(shù)轉換器 - ADC 16-Bit 2.5MSPS 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 |
| ADS1602IPFBT | 功能描述:模數(shù)轉換器 - ADC 16-Bit 2.5MSPS 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 |
| ADS1602IPFBTG4 | 功能描述:模數(shù)轉換器 - ADC 16-Bit 2.5MSPS 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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