参数资料
型号: PGA117AIPW
厂商: TEXAS INSTRUMENTS INC
元件分类: 模拟信号调理
英文描述: SPECIALTY ANALOG CIRCUIT, PDSO20
封装: GREEN, PLASTIC, TSSOP-20
文件页数: 26/47页
文件大小: 1545K
代理商: PGA117AIPW
10kW
ADC
G=1
R
F
R
I
Output
Stage
SPI
Interface
REF3225
SCLK
DIO
CS
V
OUT
DV
DD
AV
DD
GND
V
REF
MSP430
Microcontroller
+3V
V
REF
PGA112
PGA113
V
/CH0
CAL
CH1
CAL3
CAL4
CAL1
CAL2
0.1V
CAL
0.9V
CAL
10kW
80kW
MUX
CAL2/3
2.5V
ADCRef
C
0.1 F
BYPASS
m
C
0.1 F
BYPASS
m
C
0.1 F
BYPASS
m
SBOS424B – MARCH 2008 – REVISED SEPTEMBER 2008 ............................................................................................................................................ www.ti.com
Figure 73. Using CAL Channels with VREF = Ground
Table 9. Using the MUX CAL Channels with VREF = GND
(AVDD = 3V, DVDD = 3V, ADC Ref = 2.5V, and VREF = GND)
MUX
GAIN
OP AMP
FUNCTION
SELECT
MUX INPUT
(+In)
(VOUT)
DESCRIPTION
Minimum signal level that the
MUX, op amp, and ADC can
Minimum Signal
CAL1
1
GND
50mV
read. Op amp VOUT is limited
by negative saturation.
90% ADC Ref for system
0.9 ×
Gain Calibration
CAL2
1
2.25V
full-scale or gain calibration
(VCAL/CH0)
of the ADC.
Maximum signal level that
the MUX, op amp, and ADC
can read. Op amp VOUT is
0.9 ×
Maximum Signal
CAL2
2
2.25V
2.95V
limited by positive saturation.
(VCAL/CH0)
System is limited by ADC
max input of 2.5V (ADC Ref
= 2.5V).
0.1 ×
10% ADC Ref for system
Offset Calibration
CAL3
1
0.25V
(VCAL/CH0)
offset calibration of the ADC.
Minimum signal level that the
MUX, op amp, and ADC can
Minimum Signal
CAL4
1
VREF
GND
50mV
read. Op amp VOUT is limited
by negative saturation.
32
Copyright 2008, Texas Instruments Incorporated
Product Folder Link(s): PGA112 PGA113 PGA116 PGA117
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