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參數(shù)資料
| 型號： | ADS8401 |
| 英文描述： | 16-BIT, 1.25 MSPS, UNIPOLAR INPUT, MICRO POWER SAMPLING ANALOG-TODIGITAL CONVERTER WITH PARALLEL INTERFACE AND REFERENCE |
| 中文描述： | 16位，1.25 MSPS的，單極輸入，并行接口和參考微功率取樣類比，TODIGITAL轉(zhuǎn)爐 |
| 文件頁數(shù)： | 22/25頁 |
| 文件大?。?/td> | 238K |
| 代理商： | ADS8401 |
ADS8401
SLAS376B
–
DECEMBER 2002
–
REVISED APRIL 2003
www.ti.com
22
Sampling starts with the falling edge of the BUSY signal when CS is tied low or starts with the falling edge of CS when
BUSY is low.
Both RD and CS can be high during and before a conversion with one exception (CS must be low when CONVST
goes low to initiate a conversion). Both the RD and CS pins are brought low in order to enable the parallel output bus
with the conversion.
Reading Data
The ADS8401 outputs full parallel data in straight binary format as shown in Table 1. The parallel output is active when
CS and RD are both low. There is a minimal quiet zone requirement around the falling edge of CONVST. This is 100
ns prior to the falling edge of CONVST and 40 ns after the falling edge. No data read should be attempted within this
zone. Any other combination of CS and RD sets the parallel output to 3-state. BYTE is used for multiword read
operations. BYTE is used whenever lower bits of the converter result are output on the higher byte of the bus. Refer
to Table 1 for ideal output codes.
Table 1. Ideal Input Voltages and Output Codes
DESCRIPTION
FULL SCALE RANGE
Least significant bit (LSB)
ANALOG VALUE
Vref
Vref/65536
Vref
–
1 LSB
Vref/2
Vref/2
–
1 LSB
0 V
DIGITAL OUTPUT STRAIGHT BINARY
BINARY CODE
HEX CODE
Full scale
1111 1111 1111 1111
FFFF
Midscale
1000 0000 0000 0000
8000
Midscale
–
1 LSB
0111 1111 1111 1111
7FFF
Zero
0000 0000 0000 0000
0000
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) appear 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
DB7
–
DB0
High
D7
–
D0
All one
’
s
Low
D15
–
D8
D7
–
D0
RESET
RESET is an asynchronous active low input signal (that works independently 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.
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| ADS8401IBPFBR | 16-BIT, 1.25 MSPS, UNIPOLAR INPUT, MICRO POWER SAMPLING ANALOG-TODIGITAL CONVERTER WITH PARALLEL INTERFACE AND REFERENCE |
| ADS8401IBPFBT | 16-BIT, 1.25 MSPS, UNIPOLAR INPUT, MICRO POWER SAMPLING ANALOG-TODIGITAL CONVERTER WITH PARALLEL INTERFACE AND REFERENCE |
| ADS8401IPFBR | 16-BIT, 1.25 MSPS, UNIPOLAR INPUT, MICRO POWER SAMPLING ANALOG-TODIGITAL CONVERTER WITH PARALLEL INTERFACE AND REFERENCE |
| ADS8401IPFBT | 16-BIT, 1.25 MSPS, UNIPOLAR INPUT, MICRO POWER SAMPLING ANALOG-TODIGITAL CONVERTER WITH PARALLEL INTERFACE AND REFERENCE |
| ADS8406 | 16-BIT, 1.25 MSPS, PSEUDO-BIPOLAR, FULLY DIFFERENTIAL INPUT, MICRO POWER SAMPLING ANALOG-TO-DIGITAL CONVERTER WITH PARALLEL INTERFACE |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ADS8401EVM | 功能描述:數(shù)據(jù)轉(zhuǎn)換 IC 開發(fā)工具 ADS8401 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 |
| ADS8401IBPFBR | 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 |
| ADS8401IBPFBRG4 | 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 |
| ADS8401IBPFBT | 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 |
| ADS8401IBPFBTG4 | 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 |
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