参数资料
| 型号： | SX8723CWLTDT |
| 厂商： | Semtech |
| 文件页数： | 14/67页 |
| 文件大小： | 0K |
| 描述： | IC DAS ADC 16BIT I2C/SRL |
| 标准包装： | 1 |
| 系列： | ZoomingADC™ |
| 类型： | 数据采集系统（DAS） |
| 输入类型： | 差分 |
| 输出类型： | 数字 |
| 接口： | I²C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 12-WFDFN 裸露焊盘 |
| 供应商设备封装： | 12-MLPD-EP（4x4） |
| 包装： | 标准包装 |
| 其它名称： | SX8723CWLTDTDKR |
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Page 21
ADVANCED COMMUNICATIONS & SENSING
DATASHEET
SX8723C
ZoomingADC for sensing data acquisition
Revision 1.01
January 2011
Semtech
(3)
SetNelconv: (rw) sets the number of elementary conversions to 2
(SetNelconv[1:0]). To compensate for offsets, the input signal is chopped
between elementary conversions (1,2,4,8).
(4)
SetOsr: (rw) sets the over-sampling rate (OSR) of an elementary conversion to 2
(3+SetOsr[2:0]). OSR = 8, 16, 32, ..., 512, 1024.
(5)
Continuous: (rw) setting this bit starts a conversion. When this bis is 1, A new conversion will automatically begin directly when the previ-
ous one is finished.
(6)
Reserved
(7)
IbAmpAdc: (rw) sets the bias current in the ADC to 0.25 x (1+ IbAmpAdc[1:0]) of the normal operation current (25, 50, 75 or 100% of nom-
inal current). To be used for low-power, low-speed operation.
(8)
IbAmpPga: (rw) sets the bias current in the PGAs to 0.25 x (1+IbAmpPga[1:0]) of the normal operation current (25, 50, 75 or 100% of nom-
inal current). To be used for low-power, low-speed operation.
(9)
Enable: (rw) enables the ADC modulator (bit 0) and the different stages of the PGAs (PGAi by bit i=1,2,3). PGA stages that are disabled are
bypassed.
(10)
SetFs: (rw) These bits set the over sampling frequency of the acquisition chain. Expressed as a fraction of the oscillator frequency, the
sampling frequency is given as: 11 ' 500 kHz, 10 ' 250 kHz, 01 ' 125 kHz, 00 ' 62.5 kHz.
(11)
Pga1Gain: (rw) sets the gain of the first stage: 0 ' 1, 1 ' 10.
(12)
Pga2Gain: (rw) sets the gain of the second stage: 00 ' 1, 01 ' 2, 10 ' 5, 11 ' 10.
(13)
Pga3Gain: (rw) sets the gain of the third stage to Pga3Gain[6:0] 1/12.
(14)
Pga2Offset: (rw) sets the offset of the second stage between -1 and +1, with increments of 0.2. The MSB gives the sign (0 positive, 1 neg-
ative); amplitude is coded with the bits Pga2Offset[5:0].
(15)
Pga3Offset: (rw) sets the offset of the third stage between -5.25 and +5.25, with increments of 1/12. The MSB gives the sign (0 positive, 1
negative); amplitude is coded with the bits Pga3Offset[5:0].
(16)
Busy: (r) set to 1 if a conversion is running.
(17)
Def: (w) sets all values to their defaults (PGA disabled, max speed, nominal modulator bias current, 2 elementary conversions, over-sam-
pling rate of 32) and starts a new conversion without waiting the end of the preceding one.
(18)
Amux(4:0): (rw) Amux[4] sets the mode (0 ' differential inputs, 1 ' single ended inputs with A0= common reference) Amux[3] sets the sign
(0 ' straight, 1' cross) Amux[2:0] sets the channel.
(19)
Vmux: (rw) sets the differential reference channel (0 ' VBATT, 1 ' VREF).
7.3 Input Multiplexers (AMUX and VMUX)
The ZoomingADC has analog inputs AC0 to AC5 and reference inputs. Let us first define the differential input voltage
VIN and reference voltage VREF,ADC respectively as:
As shown in Table 9, the inputs can be configured in two ways: either as 4 differential channels (VIN1= AC1 - AC0,... , VIN3
= AC5 - AC4), or AC0 can be used as a common reference, providing 7 signal paths all referred to AC0. The control word
for the analog input selection is Amux. Notice that the Amux bit 4 controls the sign of the input voltage.
Equation 3
Equation 4
Table 9. Analog Input Selection
Amux
(RegACCfg5[5:1])
VINP
VINN
Amux
(RegACCfg5[5:1])
VINP
VINN
Sign S = 1
Sign S = -1
00x00
AC1(VREF)AC0(VSS)
01x00
AC1(VSS)AC0(VREF)
]
[V
V
INN
INP
IN
=
]
[V
V
REFN
REFP
REF
=
Not
Recommended
for
New
Designs
相关PDF资料 |
PDF描述 |
|---|---|
| SX8723E083TDT | IC DAS PRESS/TEMP SENS 12MLPD |
| SX8724CWLTDT | IC DAS ADC 16BIT I2C/SRL |
| SX8724E082TDT | IC DAS PRESS/TEMP SENS 16MLPQ |
| SX8725CWLTDT | IC DAS ADC 16BIT I2C/SRL |
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相关代理商/技术参数 |
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| SX8723E083TDT | 功能描述:IC DAS PRESS/TEMP SENS 12MLPD RoHS:是 类别:集成电路 (IC) >> 接口 - 传感器和探测器接口 系列:ZoomingADC™ 其它有关文件:Automotive Product Guide 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:74 系列:- 类型:触控式传感器 输入类型:数字 输出类型:数字 接口:JTAG，串行 电流 - 电源:100µA 安装类型:表面贴装 封装/外壳:20-TSSOP（0.173"，4.40mm 宽） 供应商设备封装:20-TSSOP 包装:管件 |
| SX8723E083TRT | 功能描述:IC DAS PRESSURE/TEMP SENS 12MLPD RoHS:是 类别:集成电路 (IC) >> 接口 - 传感器和探测器接口 系列:ZoomingADC™ 其它有关文件:Automotive Product Guide 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:74 系列:- 类型:触控式传感器 输入类型:数字 输出类型:数字 接口:JTAG，串行 电流 - 电源:100µA 安装类型:表面贴装 封装/外壳:20-TSSOP（0.173"，4.40mm 宽） 供应商设备封装:20-TSSOP 包装:管件 |
| SX8723S | 制造商:SEMTECH 制造商全称:Semtech Corporation 功能描述:ZoomingADC for sensing data acquisition |
| SX8723SWLTDT | 制造商:Semtech Corporation 功能描述:2 INPUTS ZOOMING ADC WITH SPI |
| SX8724 | 制造商:SEMTECH 制造商全称:Semtech Corporation 功能描述:ZoomingADC? for Pressure and Temperature Sensing |
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