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PDF ISL28288 Data sheet ( Hoja de datos )
| Número de pieza | ISL28288 | |
| Descripción | (ISL28288 / ISL28488) Dual and Quad Micropower Single Supply Rail-to-Rail Input and Output (RRIO) Op-Amp | |
| Fabricantes | Intersil | |
| Logotipo |  |
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Data Sheet
ISL28288, ISL28488
June 28, 2007
FN6339.1
Dual and Quad Micropower Single Supply
Rail-to-Rail Input and Output (RRIO)
Op-Amp
The ISL28288 and ISL28488 are dual and quad channel
micropower operational amplifiers optimized for single
supply operation over the 2.4V to 5V range. They can be
operated from one lithium cell or two Ni-Cd batteries. For
equivalent performance in a single channel op-amp
reference EL8188.
These devices feature an Input Range Enhancement Circuit
(IREC) which enables them to maintain CMRR performance
for input voltages 10% above the positive supply rail and to
100mV below the negative supply. The output operation is
rail to rail.
The ISL28288 and ISL28488 draw minimal supply current
while meeting excellent DC-accuracy, AC-performance,
noise and output drive specifications. The ISL28288
contains a power down enable pin that reduces the power
supply current to typically less than 4µA in the disabled
state.
Pinouts
ISL28288
(10 LD MSOP)
TOP VIEW
IN+_A 1
EN_A 2
V- 3
EN_B 4
IN+_B 5
10 IN-_A
-
+
9 OUT_A
8 V+
+
-
7 OUT_B
6 IN-_B
ISL28488
(16 LD QSOP)
TOP VIEW
OUT_A 1
IN-_A 2
IN+_A 3
V+ 4
IN+_B 5
IN-_B 6
OUT_B 7
NC 8
16 OUT_D
15 IN-_D
14 IN+_D
13 V-
12 IN+_C
11 IN-_C
10 OUT_C
9 NC
Features
• Low power 120µA typical supply current
• 1.5mV max offset voltage
• 30pA max input bias current
• 300kHz typical gain-bandwidth product
• 105dB typical PSRR
• 100dB typical CMRR
• Single supply operation down to 2.4V
• Input is capable of swinging above V+ and below V-
(ground sensing)
• Rail-to-rail input and output (RRIO)
• Enable Pin (ISL28288 only)
• Pb-free plus anneal available (RoHS compliant)
Applications
• Battery- or solar-powered systems
• 4mA to 25mA current loops
• Handheld consumer products
• Medical devices
• Thermocouple amplifiers
• Photodiode pre-amps
• pH probe amplifiers
Ordering Information
PART NUMBER
(Note)
PART
MARKING
PACKAGE PKG. DWG.
(Pb-Free)
#
ISL28288FUZ
8288Z
10 Ld MSOP MDP0043
ISL28288FUZ-T7 8288Z
10 Ld MSOP MDP0043
ISL28488FAZ
28488 FAZ 16 Ld QSOP MDP0040
ISL28488FAZ-T7 28488 FAZ 16 Ld QSOP MDP0040
*“-T7” suffix is for tape and reel. Please refer to TB347 for details on
reel specifications.
NOTE: Intersil Pb-free plus anneal products employ special Pb-free
material sets; molding compounds/die attach materials and 100%
matte tin plate termination finish, which are RoHS compliant and
compatible with both SnPb and Pb-free soldering operations.
Intersil Pb-free products are MSL classified at Pb-free peak reflow
temperatures that meet or exceed the Pb-free requirements of
IPC/JEDEC J STD-020.
1 CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 1-888-468-3774 | Intersil (and design) is a registered trademark of Intersil Americas Inc.
Copyright Intersil Americas Inc. 2006, 2007. All Rights Reserved
All other trademarks mentioned areFrtehee pDroaptaersthyeoef tthhetirtrpe:s/p/ewcwtivwe .odwantearssh. eet4u.com/
1 page  
ISL28288, ISL28488
Typical Performance Curves V+ = 5V, V- = 0V, VCM = 2.5V, RL = Open (Continued)
10.00
1k
1.00
100
0.10
10
0.01
1
10 100 1k 10k 100k
FREQUENCY (Hz)
FIGURE 7. CURRENT NOISE vs FREQUENCY
1
1 10 100 1k 10k 100k
FREQUENCY (Hz)
FIGURE 8. VOLTAGE NOISE vs FREQUENCY
5.4µVP-P
TIME (1s/DIV)
FIGURE 9. 0.1Hz TO 10Hz INPUT VOLTAGE NOISE
2.56
2.54
VIN
2.52
2.50
VOUT
2.48
2.46
2.44
V+ = 5VDC
VOUT = 0.1VP-P
RL = 1kΩ
AV = +1
2.42
0 2 4 6 8 10 12 14 16 18 20
TIME (µs)
FIGURE 10. SMALL SIGNAL TRANSIENT RESPONSE
5.0
V+ = 5VDC
4.0
VOUT = 2VP-P
RL = 1kΩ
VOUT
AV = -2
3.0
2.0
1.0 VIN
0
0 50 100 150 200 250
TIME (µs)
FIGURE 11. LARGE SIGNAL TRANSIENT RESPONSE
5
EN
INPUT
AV = -1
VIN = 200mVP-P
V+ = 5V
V- = 0V
0
VOUT
0
10µs/DIV
FIGURE 12. ENABLE TO OUTPUT DELAY TIME
FN6339.1
June 28, 2007
Free Datasheet http://www.datasheet4u.com/
5 Page 
ISL28288, ISL28488
noise injection into the channel being used. The proper way
to prevent this oscillation is to short the output to the
negative input and ground the positive input (as shown in
Figure 34).
-
ISL28288
+
FIGURE 34. PREVENTING OSCILLATIONS IN UNUSED
CHANNELS
Proper Layout Maximizes Performance
To achieve the maximum performance of the high input
impedance and low offset voltage of the ISL28288, care
should be taken in the circuit board layout. The PC board
surface must remain clean and free of moisture to avoid
leakage currents between adjacent traces. Surface coating
of the circuit board will reduce surface moisture and provide
a humidity barrier, reducing parasitic resistance on the
board. When input leakage current is a concern, the use of
guard rings around the amplifier inputs will further reduce
leakage currents. Figure 35 shows a guard ring example for
a unity gain amplifier that uses the low impedance amplifier
output at the same voltage as the high impedance input to
eliminate surface leakage. The guard ring does not need to
be a specific width, but it should form a continuous loop
around both inputs. For further reduction of leakage
currents, components can be mounted to the PC board
using Teflon standoff insulators.
HIGH IMPEDANCE INPUT
V+
IN
FIGURE 35. GUARD RING EXAMPLE FOR UNITY GAIN
AMPLIFIER
Example Application
Thermocouples are the most popular temperature-sensing
device because of their low cost, interchangeability, and
ability to measure a wide range of temperatures. The
ISL28288 (Figure 36) is used to convert the differential
thermocouple voltage into single-ended signal with 10X gain.
The ISL28288's rail-to-rail input characteristic allows the
thermocouple to be biased at ground and the amplifier to run
from a single 5V supply.
.
R3 10kΩ
R2
K TYPE
THERMOCOUPLE
10kΩ
R4
100kΩ
+ V+
ISL28X88
- V-
+
5V
410µV/°C
R1
100kΩ
FIGURE 36. THERMOCOUPLE AMPLIFIER
Current Limiting
The ISL28288 has no internal current-limiting circuitry. If the
output is shorted, it is possible to exceed the Absolute
Maximum Rating for output current or power dissipation,
potentially resulting in the destruction of the device.
Power Dissipation
It is possible to exceed the +150°C maximum junction
temperatures under certain load and power-supply
conditions. It is therefore important to calculate the
maximum junction temperature (TJMAX) for all applications
to determine if power supply voltages, load conditions, or
package type need to be modified to remain in the safe
operating area. These parameters are related in Equation 1:
TJMAX = TMAX + (θJAxPDMAXTOTAL)
(EQ. 1)
where:
• PDMAXTOTAL is the sum of the maximum power
dissipation of each amplifier in the package (PDMAX)
• PDMAX for each amplifier is calculated in Equation 2:
PDMAX
=
2*VS × ISMAX + (VS
-
VO
U
T
MA
X
)
×
V-----O----U----T----M-----A----X--
RL
(EQ. 2)
where:
• TMAX = Maximum ambient temperature
• θJA = Thermal resistance of the package
• PDMAX = Maximum power dissipation of 1 amplifier
• VS = Supply voltage (Magnitude of V+ and V-)
• IMAX = Maximum supply current of 1 amplifier
• VOUTMAX = Maximum output voltage swing of the
application
• RL = Load resistance
11 FN6339.1
June 28, 2007
Free Datasheet http://www.datasheet4u.com/
11 Page | ||
| Páginas | Total 13 Páginas | |
| PDF Descargar | [ Datasheet ISL28288.PDF ] | |
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