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參數(shù)資料
| 型號： | SX8725CWLTDT |
| 廠商： | Semtech |
| 文件頁數(shù)： | 14/68頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC DAS ADC 16BIT I2C/SRL |
| 標準包裝： | 1 |
| 系列： | ZoomingADC™ |
| 類型： | 數(shù)據(jù)采集系統(tǒng)（DAS） |
| 輸入類型： | 差分 |
| 輸出類型： | 數(shù)字 |
| 接口： | I²C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 12-WDFN 裸露焊盤 |
| 供應商設備封裝： | 12-MLPD-EP（4x4） |
| 包裝： | 標準包裝 |
| 其它名稱： | SX8725CWLTDTDKR |
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www.semtech.com/products/
Page 21
ADVANCED COMMUNICATIONS & SENSING
DATASHEET
SX8725C
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 AC3 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, VIN2 =
AC3 - AC2), 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
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| SX8725E083TDT | 功能描述:IC DAS PRESS/TEMP SENS 12MLPD RoHS:是 類別:集成電路 (IC) >> 接口 - 傳感器和探測器接口 系列:ZoomingADC™ 其它有關文件:Automotive Product Guide 產(chǎn)品培訓模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝:74 系列:- 類型:觸控式傳感器 輸入類型:數(shù)字 輸出類型:數(shù)字 接口:JTAG，串行 電流 - 電源:100µA 安裝類型:表面貼裝 封裝/外殼:20-TSSOP（0.173"，4.40mm 寬） 供應商設備封裝:20-TSSOP 包裝:管件 |
| SX8725E083TRT | 功能描述:IC DAS PRESSURE/TEMP SENS 12MLPD RoHS:是 類別:集成電路 (IC) >> 接口 - 傳感器和探測器接口 系列:ZoomingADC™ 其它有關文件:Automotive Product Guide 產(chǎn)品培訓模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝:74 系列:- 類型:觸控式傳感器 輸入類型:數(shù)字 輸出類型:數(shù)字 接口:JTAG，串行 電流 - 電源:100µA 安裝類型:表面貼裝 封裝/外殼:20-TSSOP（0.173"，4.40mm 寬） 供應商設備封裝:20-TSSOP 包裝:管件 |
| SX8725S | 制造商:SEMTECH 制造商全稱:Semtech Corporation 功能描述:ZoomingADC for sensing data acquisition ADVANCED COMMUNICATIONS & SENSING |
| SX8725SWLTDT | 制造商:Semtech Corporation 功能描述: 制造商:Semtech Corporation 功能描述:1 INPUTS ZOOMING ADC WITH SPI |
| SX8733 | 制造商:SEMTECH 制造商全稱:Semtech Corporation 功能描述:Precision Diode Digital Temperature For Up To 3 External Sensors |
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