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| 型号： | SX8725CWLTDT |
| 元件分类： | ADC |
| 英文描述： | 2-CH 16-BIT PROPRIETARY METHOD ADC, SERIAL/PARALLEL ACCESS, PDSO12 |
| 封装： | 4 X 4 MM, HALOGEN FREE AND ROHS COMPLIANT, MLPD-12 |
| 文件页数： | 11/68页 |
| 文件大小： | 1718K |
| 代理商： | SX8725CWLTDT |
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Page 19
ADVANCED COMMUNICATIONS & SENSING
DATASHEET
SX8725C
ZoomingADC for sensing data acquisition
Revision 1.01
January 2011
Semtech
The core of the zooming section is made of three differential programmable amplifiers (PGA). After selection of an
input and reference signals VIN and VREF,ADC combination, the input voltage is modulated and amplified through
stages 1 to 3. Fine gain programming up to 1'000 V/V is possible. In addition, the last two stages provide
programmable offset. Each amplifier can be bypassed if needed.
The output of the cascade of PGA is directly fed to the analog-to-digital converter (ADC), which converts the signal
VIN,ADC into digital.
Like most ADCs intended for instrumentation or sensing applications, the ZoomingADCTM is an over-sampled
converter 1. The ADC is a so-called incremental converter; with bipolar operation (the ADC accepts both positive and
negative differential input voltages). In first approximation, the ADC output result relative to full-scale (FS) delivers the
quantity:
in two's complement (see Equation 18 and Equation 19, page 33 for details). The output code OUTADC is -FS / 2 to +
FS / 2 for VIN,ADC = -VREF,ADC / 2 to + VREF,ADC / 2 respectively. As will be shown, VIN,ADC is related to input voltage VIN by
the relationship:
where GDTOT is the total PGA gain, GDOFFTOT is the total magnitude of PGA offset and S is the sign of the offset (see
7.1.2 Programmable Gain Amplifiers
As seen in Figure 10, page 18, the zooming function is implemented with three programmable gain amplifiers (PGA).
These are:
PGA1: coarse gain tuning
PGA2: medium gain and offset tuning
PGA3: fine gain and offset tuning. Should be set ON for high linearity data acquisition
All gain and offset settings are realized with ratios of capacitors. The user has control over each PGA activation and
gain, as well as the offset of stages 2 and 3. These functions are examined hereafter.
1.
Over-sampled converters are operated with a sampling frequency fS much higher than the input signal's Nyquist rate (typically fS is 20-
1'000 times the input signal bandwidth). The sampling frequency to throughput ratio is large (typically 10-500). These converters include
digital decimation filtering. They are mainly used for high resolution, and/or low-to-medium speed applications.
Equation 1
Equation 2
2
/
2
/
,
REF
ADC
IN
ADC
V
FS
OUT
]
[
,
V
S
GDoff
V
GD
V
REF
TOT
IN
TOT
ADC
IN
=
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相关代理商/技术参数 |
参数描述 |
|---|---|
| SX8725E083TDT | 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 |
| SX8725E083TRT | 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 |
| SX8725S | 制造商:SEMTECH 制造商全称: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 制造商全称:Semtech Corporation 功能描述:Precision Diode Digital Temperature For Up To 3 External Sensors |
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