Texas Instruments THS4281 Evaluation Module THS4281EVM THS4281EVM Scheda Tecnica
Codici prodotto
THS4281EVM
+
−
100
2.5
ADS8320
10 nF
500
V BAT
Load
+IN
−IN
V OUT = I RSENSE
0.2
I
RSENSE
THS4281
470 pF
470 pF
VBAT
VBAT
W
k
W
W
2.5 k
W
500
W
W
VBAT/2
High-Side, Low Power Current-Sensing System
www.ti.com
SLOS432A – APRIL 2004 – REVISED NOVEMBER 2009
VERY LOW-POWER, HIGH-SPEED, RAIL-TO-RAIL INPUT AND OUTPUT
VOLTAGE-FEEDBACK OPERATIONAL AMPLIFIER
Check for Samples:
1
FEATURES
DESCRIPTION
23
•
Very Low Quiescent Current: 750
μ
A (at 5 V)
•
Rail-to-Rail Input and Output:
Fabricated using the BiCom-II process, the THS4281
is
is
a
low-power,
rail-to-rail
input
and
output,
–
Common-Mode Input Voltage Extends
voltage-feedback operational amplifier designed to
400 mV Beyond the Rails
operate over a wide power-supply range of 2.7-V to
–
Output Swings Within 150 mV From the
15-V single supply, and ±1.35-V to ±7.5-V dual
Rails
supply. Consuming only 750
μ
A with a unity gain
bandwidth of 90 MHz and a high 35-V/
μ
s slew rate,
•
Wide –3-dB Bandwidth at 5 V:
the THS4281 allows portable or other power-sensitive
–
90 MHz at Gain = +1, 40 MHz at Gain = +2
applications to realize high performance with minimal
•
High Slew Rate: 35 V/
μ
s
power. To ensure long battery life in portable
applications, the quiescent current is trimmed to be
applications, the quiescent current is trimmed to be
•
Fast Settling Time (2-V Step):
less than 900
μ
A at +25°C, and 1 mA from –40°C to
–
78 ns to 0.1%
+85°C.
–
150 ns to 0.01%
The THS4281 is a true single-supply amplifier with a
•
Low Distortion at Gain = +2, V
O
= 2-V
PP
, 5 V:
specified common-mode input range of 400 mV
–
–91 dBc at 100 kHz, –67 dBc at 1 MHz
beyond the rails. This allows for high-side current
sensing
sensing
applications
without
phase
reversal
•
Input Offset Voltage: 2.5 mV (Max at +25°C)
concerns. Its output swings to within 40 mV from the
•
Output Current > 30 mA (10-
Ω
Load, 5 V)
rails with 10-k
Ω
loads, and 150 mV from the rails with
•
Low Voltage Noise of 12.5 nV/
√
Hz
1-k
Ω
loads.
•
Supply Voltages: +2.7 V, 3 V, +5 V, ±5 V, +15 V
The THS4281 has a good 0.1% settling time of 78 ns,
•
Packages: SOT23, MSOP, and SOIC
and 0.01% settling time of 150 ns. The low THD of
–87 dBc at 100 kHz, coupled with a maximum offset
–87 dBc at 100 kHz, coupled with a maximum offset
APPLICATIONS
voltage of less than 2.5 mV, makes the THS4281 a
good match for high-resolution ADCs sampling less
good match for high-resolution ADCs sampling less
•
Portable/Battery-Powered Applications
than 2 MSPS.
•
High Channel Count Systems
•
ADC Buffer
The THS4281 is offered in a space-saving SOT23-5
package, a small MSOP-8 package, and the industry
package, a small MSOP-8 package, and the industry
•
Active Filters
standard SOIC-8 package.
•
Current Sensing
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.
Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
2
FilterPro is a trademark of Texas Instruments.
3
All other trademarks are the property of their respective owners.
PRODUCTION DATA information is current as of publication date.
Copyright © 2004–2009, Texas Instruments Incorporated
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.