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THS4521_10

更新时间： 2024-11-25 08:48:59
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德州仪器 - TI 放大器输出元件输入元件
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48页 1349K
描述
VERY LOW POWER, NEGATIVE RAIL INPUT, RAIL-TO-RAIL OUTPUT, FULLY DIFFERENTIAL AMPLIFIER

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THS4521_10 数据手册

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THS4521  
THS4522  
THS4524  
www.ti.com  
SBOS458D –DECEMBER 2008–REVISED AUGUST 2010  
VERY LOW POWER, NEGATIVE RAIL INPUT, RAIL-TO-RAIL OUTPUT,  
FULLY DIFFERENTIAL AMPLIFIER  
Check for Samples: THS4521, THS4522, THS4524  
1
FEATURES  
APPLICATIONS  
•
•
•
•
Low-Power SAR and ΔΣ ADC Drivers  
Low-Power Differential Driver  
Low-Power Differential Signal Conditioning  
Low-Power, High-Performance Differential  
Audio Amplifier  
23  
•
Fully Differential Architecture  
•
Bandwidth: 145 MHz  
•
•
•
•
•
Slew Rate: 490 V/ms  
HD2: –133 dBc at 10 kHz (1 VRMS, RL = 1 kΩ)  
HD3: –140 dBc at 10 kHz (1 VRMS, RL = 1 kΩ)  
Input Voltage Noise: 4.6 nV/√Hz (f = 100 kHz)  
THD+N: –112dBc (0.00025%) at 1 kHz (22-kHz  
DESCRIPTION  
The THS4521, THS4522, and THS4524 family of  
devices are very low-power, fully differential op amps  
with rail-to-rail output and an input common-mode  
range that includes the negative rail. These amplifiers  
are designed for low-power data acquisition systems  
and  
dissipation is  
BW, G = 1, 5 VPP  
)
•
•
•
•
Open-Loop Gain: 119 dB  
NRI—Negative Rail Input  
RRO—Rail-to-Rail Output  
high-density  
applications  
critical parameter, and provide  
where  
power  
Output Common-Mode Control (with Low  
Offset and Drift)  
a
exceptional performance in audio applications.  
•
Power Supply:  
The family includes single (THS4521), dual  
(THS4522), and quad (THS4524) versions.  
–
–
Voltage: +2.5 V (±1.25 V) to +5.5 V (±2.75 V)  
Current: 1.14 mA/ch  
These fully differential op amps feature accurate  
output common-mode control that allows for  
dc-coupling when driving analog-to-digital converters  
(ADCs). This control, coupled with an input  
common-mode range below the negative rail as well  
as rail-to-rail output, allows for easy interfacing  
between single-ended, ground-referenced signal  
sources. Additionally, these devices are ideally suited  
for driving both successive-approximation register  
(SAR) and delta-sigma (ΔΣ) ADCs using only a single  
+2.5V to +5V and ground power supply.  
•
Power-Down Capability: 20 mA (typ)  
THS4521 and ADS1278 Combined Performance  
1 kW  
1.5 nF  
5 V  
49.9 W  
1 kW  
AINN1  
VIN+  
2.2 nF  
THS4521  
ADS1278 (CH 1)  
49.9 W  
VIN-  
AINP1 VCOM  
1 kW  
VOCM  
x1  
0.1 mF  
0.1 mF  
1/2  
OPA2350  
1.5 nF  
The THS4521, THS4522, and THS4524 family of fully  
differential op amps is characterized for operation  
over the full industrial temperature range from –40°C  
to +85°C.  
1 kW  
1-kHz FFT  
0
-20  
-40  
-60  
-80  
G = 1  
RF = RG = 1 kW  
CF = 1.5 nF  
VS = 5 V  
Load = 2 x 49.9 W + 2.2 nF  
RELATED  
PRODUCTS  
-100  
-120  
-140  
-160  
THD  
(dBc)  
BW  
(MHz)  
at 100  
kHz  
VN  
RAIL-  
0
4
8
12  
16  
20  
24 26  
Frequency (kHz)  
DEVICE  
THS4520  
THS4121  
THS4130  
IQ (mA)  
15.3  
16  
(nV/√Hz) TO-RAIL  
Tone  
Signal  
(dBFS)  
-0.50  
SINAD  
(dBc)  
105.5  
SFDR  
(dBc)  
113.7  
570  
100  
150  
–114  
–79  
2
Out  
In/Out  
No  
SNR (dBc) THD (dBc)  
-107.9  
(Hz)  
1 k  
109.1  
5.4  
1.3  
16  
–107  
1
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas  
Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.  
2
3
I2S is a trademark of NXP Semiconductor.  
All other trademarks are the property of their respective owners.  
PRODUCTION DATA information is current as of publication date.  
Products conform to specifications per the terms of the Texas  
Instruments standard warranty. Production processing does not  
necessarily include testing of all parameters.  
Copyright © 2008–2010, Texas Instruments Incorporated  
 
 
 
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