www.semtech.com/products/ Page 19 ADVANCED COMMUNICATIONS & SENSING DATASHEET SX8725C ZoomingADC fo" />
參數(shù)資料
型號(hào)： SX8725CWLTDT
廠商： Semtech
文件頁(yè)數(shù)： 11/68頁(yè)
文件大?。?/td> 0K
描述： IC DAS ADC 16BIT I2C/SRL
標(biāo)準(zhǔn)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(yīng)商設(shè)備封裝： 12-MLPD-EP（4x4）
包裝： 標(biāo)準(zhǔn)包裝
其它名稱： SX8725CWLTDTDKR
www.semtech.com/products/
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
=
Not
Recommended
for
New
Designs
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