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參數(shù)資料
| 型號(hào)： | ADS8402IPFBR |
| 英文描述： | 16-BIT, 1.25 MSPS, UNIPOLAR DIFFERENTIAL INPUT, MICRO POWER SAMPLING ANALOG-TO-DIGITAL CONVERTER WITH PARALLEL INTERFACE AND REFERENCE |
| 中文描述： | 16位，1.25 MSPS的，單極差動(dòng)輸入，微功耗采樣模數(shù)位并行接口和參考轉(zhuǎn)爐 |
| 文件頁數(shù)： | 23/25頁 |
| 文件大?。?/td> | 212K |
| 代理商： | ADS8402IPFBR |
ADS8402
SLAS154B
–
DECEMBER 2002
–
REVISED MAY 2003
www.ti.com
23
Table 1. Ideal Input Voltages and Output Codes
DESCRIPTION
FULL SCALE RANGE
Least significant bit (LSB)
ANALOG VALUE
2Vref
2Vref/65536
Vref
0
DIGITAL OUTPUT TWOS COMPLEMENT
BINARY CODE
HEX CODE
Full scale
0111 1111 1111 1111
7FFF
Midscale
0000 0000 0000 0000
0000
Zero
–
Vref
1000 0000 0000 0000
8000
The output data is a full 16-bit word (D15
–
D0) on DB15
–
DB0 pins (MSB
–
LSB) if BYTE is low.
The result may also be read on an 8-bit bus for convenience. This is done by using only pins DB15
–
DB8. In this case
two reads are necessary: the first as before, leaving BYTE low and reading the 8 most significant bits on pins
DB15
–
DB8, then bringing BYTE high. When BYTE is high, the low bits (D7
–
D0) appears on pins DB15
–
D8.
These multiword read operations can be done with multiple active RD (toggling) or with RD tied low for simplicity.
BYTE
DATA READ OUT
DB15
–
DB8
D7
–
D0
DB7
–
DB0
All one
’
s
High
Low
D15
–
D8
D7
–
D0
RESET
RESET is an asynchronous active low input signal (that works independantly of CS). Minimum RESET low time is
20 ns. Current conversion will be aborted no later than 50 ns after the converter is in the reset mode. In addition, all
output latches are cleared (set to zero
’
s) after RESET. The converter goes back to normal operation mode no later
than 20 ns after RESET input is brought high.
The converter starts the first sampling period 20 ns after the rising edge of RESET. Any sampling period except for
the one immediately after a RESET is started with the falling edge of the previous BUSY signal or the falling edge
of CS, whichever is later.
POWER-ON INITIALIZATION
One RESET pulse followed by three conversion cycles must be given to the converter after powerup to ensure proper
operation. The next pulse can be issued once both +VA and +VBD reach 95% of the minimum required value.
LAYOUT
For optimum performance, care should be taken with the physical layout of the ADS8402 circuitry.
As the ADS8402 offers single-supply operation, it is often used in close proximity with digital logic, microcontrollers,
microprocessors, and digital signal processors. The more digital logic present in the design and the higher the
switching speed, the more difficult it is to achieve good performance from the converter.
The basic SAR architecture is sensitive to glitches or sudden changes on the power supply, reference, ground
connections and digital inputs that occur just prior to latching the output of the analog comparator. Thus, driving any
single conversion for an n-bit SAR converter, there are at least n
windows
in which large external transient voltages
can affect the conversion result. Such glitches might originate from switching power supplies, nearby digital logic,
or high power devices.
The degree of error in the digital output depends on the reference voltage, layout, and the exact timing of the external
event.
On average, the ADS8402 draws very little current from an external reference, as the reference voltage is internally
buffered. If the reference voltage is external and originates from an op amp, make sure that it can drive the bypass
capacitor or capacitors without oscillation. A 0.1-
μ
F bypass capacitor and 1-
μ
F storage capacitor are recommended
from pin 1 (REFIN) directly to pin 48 (REFM). REFM and AGND should be shorted on the same ground plane under
the device.
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| ADS8402IPFBRG4 | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 16 bit 1.25MSPS Parallel W/Ref 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 |
| ADS8402IPFBT | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 16 bit 1.25MSPS Parallel W/Ref 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 |
| ADS8402IPFBTG4 | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 16B 1.25MSPS Para 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 |
| ADS8405 | 制造商:BB 制造商全稱:BB 功能描述:16-BIT, 1-MSPS, PSEUDO-BIPOLAR, FULLY DIFFERENTIAL INPUT, MICROPOWER SAMPLING ANALOG-TO-DIGITAL CONVERTER WITH PARALLEL INTERFACE, REFERENCE |
| ADS8405EVM | 功能描述:數(shù)據(jù)轉(zhuǎn)換 IC 開發(fā)工具 ADS8405 Eval Mod RoHS:否 制造商:Texas Instruments 產(chǎn)品:Demonstration Kits 類型:ADC 工具用于評(píng)估:ADS130E08 接口類型:SPI 工作電源電壓:- 6 V to + 6 V |
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