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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： | 33/47页 |
| 文件大小： | 1545K |
| 代理商： | PGA117AIPW |
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APPLICATIONS: DRIVING/INTERFACING TO
10kW
CDACSAR
ADC
G=1
R
F
R
I
Output
Stage
SPI
Interface
SCLK
DIO
CS
7
V
OUT
5
DV
DD
10
AV
DD
1
GND
6
V
REF
4
3
8
9
+3V
+5V
V
REF
PGA112
PGA113
(MSOP-10)
V
/CH0
CAL
2
CH1
CAL3
CAL4
CAL1
CAL2
0.1V
CAL
0.9V
CAL
10kW
80kW
MUX
CAL2/3
R
100W
FILT
C
FILT
(1nF)
C
SH
40pF
12-BitSettling
500kHz
16-BitSettling
300kHz
C
0.1 F
BYPASS
m
C
0.1 F
BYPASS
m
C
0.1 F
BYPASS
m
,, PGA113
www.ti.com ............................................................................................................................................ SBOS424B – MARCH 2008 – REVISED SEPTEMBER 2008
2. Signal trace routing. Keep VOUT and other low
Bypass
capacitors
greater
than
100pF
are
impedance traces away from MUX channel inputs
recommended. Lower impedances and a bypass
that are high impedance. Poor signal routing can
capacitor placed directly at the input MUX
cause positive feedback, unwanted oscillations,
channels keep crosstalk between channels to a
or
excessive
overshoot
and
ringing
on
minimum as a result of parasitic capacitive
step-changing signals. If the input signals are
coupling from adjacent PCB traces and pin-to-pin
particularly noisy, separate MUX input channels
capacitance.
with guard traces on either side of the signal
traces. Connect the guard traces to ground near
the PGA and at the signal entry point into the
ADCS
PCB. On multilayer PCBs, ensure that there are
CDAC
SAR
ADCs
contain
an
input
sampling
no parallel traces near MUX input traces on
capacitor, CSH, to sample the input signal during a
adjacent layers; capacitive coupling from other
sample period as shown in Figure 79. After the
layers can be a problem. Use ground planes to
sample period, CSH is removed from the input signal.
isolate MUX input signal traces from signal traces
Subsequent comparisons of the charge stored on CSH
on other layers.
are performed during the ADC conversion process.
Additionally, group and route the digital signals
To achieve optimal op amp stability, input signal
into the PGA as far away as possible from the
settling, and the demands for charge from the input
analog MUX input signals. Most digital signals
signal conditioning circuitry, most ADC applications
are fast rise/fall time signals with low-impedance
are optimized by the use of a resistor (RFILT) and
drive capability that can easily couple into the
capacitor (CFILT) filter placed between the op amp
high-impedance
inputs
of
the
input
MUX
output and ADC input. For the PGA112/PGA113, or
channels. This coupling can create unwanted
the PGA116/PGA117, setting CFILT = 1nF and RFILT =
noise that gains up to VOUT.
100
yields
optimum
system
performance
for
sampling converters operating at speeds up to
3. Input MUX channels and source impedance.
500kHz, depending upon the application settling time
Input MUX channels are high-impedance; when
and accuracy requirements.
combined with high gain, the channels can pick
up unwanted
noise.
Keep
the
input
signal
sources low-impedance (< 10k
). Also, consider
bypassing input MUX channels with a ceramic
bypass capacitor directly at the MUX input pin.
Figure 79. Driving/Interfacing to ADCs
Copyright 2008, Texas Instruments Incorporated
39
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相关代理商/技术参数 |
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|---|---|
| PGA117AIPWG4 | 功能描述:特殊用途放大器 Programmable Gain Amp w/Mux RoHS:否 制造商:Texas Instruments 通道数量:Single 共模抑制比（最小值）: 输入补偿电压: 工作电源电压:3 V to 5.5 V 电源电流:5 mA 最大功率耗散: 最大工作温度:+ 70 C 最小工作温度:- 40 C 安装风格:SMD/SMT 封装 / 箱体:QFN-20 封装:Reel |
| PGA117AIPWR | 功能描述:特殊用途放大器 Zero-Drift Program Gain AMP/MUX RoHS:否 制造商:Texas Instruments 通道数量:Single 共模抑制比（最小值）: 输入补偿电压: 工作电源电压:3 V to 5.5 V 电源电流:5 mA 最大功率耗散: 最大工作温度:+ 70 C 最小工作温度:- 40 C 安装风格:SMD/SMT 封装 / 箱体:QFN-20 封装:Reel |
| PGA117AIPWRG4 | 功能描述:特殊用途放大器 Programmable Gain Amp w/Mux RoHS:否 制造商:Texas Instruments 通道数量:Single 共模抑制比（最小值）: 输入补偿电压: 工作电源电压:3 V to 5.5 V 电源电流:5 mA 最大功率耗散: 最大工作温度:+ 70 C 最小工作温度:- 40 C 安装风格:SMD/SMT 封装 / 箱体:QFN-20 封装:Reel |
| PGA-120-AH3-S-TG | 制造商:3M Electronic Products Division 功能描述: |
| PGA120M004B1-1315BLU | 制造商:FCI 功能描述: |
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