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参数资料
| 型号： | TLV2556IDWR |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | ADC |
| 英文描述： | 11-CH 12-BIT SUCCESSIVE APPROXIMATION ADC, SERIAL ACCESS, PDSO20 |
| 封装： | GREEN, PLASTIC, SOIC-20 |
| 文件页数： | 22/37页 |
| 文件大小： | 729K |
| 代理商： | TLV2556IDWR |
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TLV2556
SLAS355A – DECEMBER 2001 – REVISED SEPTEMBER 2002
29
www.ti.com
PRINCIPLES OF OPERATION
data input—address/command bits
The four MSBs (D7–D4) of the input data register are the address or command. These bits can be used to
address one of the 11 input channels, select one of three reference-test voltages, activate the software
power-down mode, or access the second configuration register, CFGR2. All address/command bits affect the
current conversion, which is the conversion that immediately follows the current I/O cycle. They also allow
access to CFGR1 except for command 1111b, which allows access to CFGR2.
data output length
CFGR1 bits (D3 and D2) of the data register select the output data length. The data-length selection is valid
for the current I/O cycle (the cycle in which the data is read). The data-length selection, being valid for the current
I/O cycle, allows device start-up without losing I/O synchronization. A data length of 8, 12, or 16 bits can be
selected. Since the converter has 12-bit resolution, a data length of 12 bits is suggested.
With D3 and D2 set to 00 or 10, the device is in the 12-bit data-length mode and the result of the current
conversion is output as a 12-bit serial data stream during the next I/O cycle. The current I/O cycle must be exactly
12 bits long for proper synchronization, even when this means corrupting the output data from a previous
conversion. The current conversion is started immediately after the twelfth falling edge of the current I/O cycle.
With bits D3 and D2 set to 11, the 16-bit data-length mode is selected, which allows convenient communication
with 16-bit serial interfaces. In the 16-bit mode, the result of the current conversion is output as a 16-bit serial
data stream during the next I/O cycle with the four LSBs always reset to 0 (pad bits). The current I/O cycle must
be exactly 16 bits long to maintain synchronization even when this means corrupting the output data from the
previous conversion. The current conversion is started immediately after the sixteenth falling edge of the current
I/O cycle.
With bits D3 and D2 set to 01, the 8-bit data-length mode is selected, which allows fast communication with 8-bit
serial interfaces. In the 8-bit mode, the result of the current conversion is output as an 8-bit serial data stream
during the next I/O cycle. The current I/O cycle must be exactly eight bits long to maintain synchronization, even
when this means corrupting the output data from the previous conversion. The four LSBs of the conversion
result are truncated and discarded. The current conversion is started immediately after the eighth falling edge
of the current I/O cycle.
Since the D3 and D2 register settings take effect on the I/O cycle when the data length is programmed, there
can be a conflict with the previous cycle if the data-word length was changed. This may occur when the data
format is selected to be least significant bit first, since at the time the data length change becomes effective (six
rising edges of I/O CLOCK), the previous conversion result has already started shifting out. In actual operation,
when different data lengths are required within an application and the data length is changed between two
conversions, no more than one conversion result can be corrupted and only when it is shifted out in LSB-first
format.
LSB out first
D1 in the CFGR1 controls the direction of the output (binary) data transfer. When D1 is reset to 0, the conversion
result is shifted out MSB first. When set to 1, the data is shifted out LSB first. Selection of MSB first or LSB first
always affects the next I/O cycle and not the current I/O cycle. When changing from one data direction to
another, the current I/O cycle is never disrupted.
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相关代理商/技术参数 |
参数描述 |
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| TLV2556IDWRG4 | 功能描述:模数转换器 - ADC 12B 200 KSPS 11Ch Lo Pwr Serial ADC RoHS:否 制造商:Texas Instruments 通道数量:2 结构:Sigma-Delta 转换速率:125 SPs to 8 KSPs 分辨率:24 bit 输入类型:Differential 信噪比:107 dB 接口类型:SPI 工作电源电压:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-32 |
| TLV2556IPW | 功能描述:模数转换器 - ADC 12-Bit 200 KSPS 11 Ch Lo-Pwr RoHS:否 制造商:Texas Instruments 通道数量:2 结构:Sigma-Delta 转换速率:125 SPs to 8 KSPs 分辨率:24 bit 输入类型:Differential 信噪比:107 dB 接口类型:SPI 工作电源电压:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-32 |
| TLV2556IPW | 制造商:Texas Instruments 功能描述:12BIT ADC 200KSPS 2556 TSSOP20 制造商:Texas Instruments 功能描述:12BIT ADC, 200KSPS, 2556, TSSOP20 制造商:Texas Instruments 功能描述:12BIT ADC, 200KSPS, 2556, TSSOP20; Resolution (Bits):12bit; Sampling Rate:200kSPS; Supply Voltage Type:Single; Supply Voltage Min:2.7V; Supply Voltage Max:5.5V; Supply Current:3mA; Digital IC Case Style:TSSOP; No. of Pins:20; Input ;RoHS Compliant: Yes |
| TLV2556IPWG4 | 功能描述:模数转换器 - ADC 12-Bit 200 KSPS 11 Ch Lo-Pwr RoHS:否 制造商:Texas Instruments 通道数量:2 结构:Sigma-Delta 转换速率:125 SPs to 8 KSPs 分辨率:24 bit 输入类型:Differential 信噪比:107 dB 接口类型:SPI 工作电源电压:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-32 |
| TLV2556IPWR | 功能描述:模数转换器 - ADC 12-Bit 200 KSPS 11 Ch Lo-Pwr RoHS:否 制造商:Texas Instruments 通道数量:2 结构:Sigma-Delta 转换速率:125 SPs to 8 KSPs 分辨率:24 bit 输入类型:Differential 信噪比:107 dB 接口类型:SPI 工作电源电压:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-32 |
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