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PDF ISL28138 Data sheet ( Hoja de datos )
| Número de pieza | ISL28138 | |
| Descripción | (ISL28138 / ISL28238) Single and Dual Precision Rail-to-Rail Input-Output (RRIO) Op Amps | |
| Fabricantes | Intersil Corporation | |
| Logotipo |  |
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Data Sheet
ISL28138, ISL28238
February 19, 2008
FN6336.2
4.5MHz, Single and Dual Precision
Rail-to-Rail Input-Output (RRIO) Op Amps
www.wdatiatshheVete4ur.ycomLow Input Bias Current
The ISL28138 and ISL28238 are 4.5MHz low-power single
and dual operational amplifiers. The parts are optimized for
single supply operation from 2.4V to 5.5V, allowing operation
from one lithium cell or two Ni-Cd batteries.
The parts feature an Input Range Enhancement Circuit
(IREC) which enables them to maintain CMRR performance
for input voltages greater than the positive supply. The input
signal is capable of swinging 0.25V above the positive
supply and to 100mV below the negative supply with only a
slight degradation of the CMRR performance. The output
operation is rail-to-rail.
The parts draw minimal supply current (900µA per amplifier)
while meeting excellent DC accuracy, AC performance,
noise and output drive specifications. The ISL28138 features
an enable pin that can be used to turn the device off and
reduce the supply current to less than 20µA. Operation is
guaranteed over -40°C to +125°C temperature range.
Ordering Information
PART NUMBER
PART
PACKAGE
(Note)
MARKING (Pb-free)
ISL28138FHZ-T7* GABR
6 Ld SOT-23
ISL28138FHZ-T7A* GABR
6 Ld SOT-23
ISL28138FBZ
28138 FBZ 8 Ld SOIC
PKG. DWG. #
MDP0038
MDP0038
MDP0027
ISL28138FBZ-T7* 28138 FBZ 8 Ld SOIC
MDP0027
Coming Soon
ISL28238FBZ
28238 FBZ 8 Ld SOIC
MDP0027
Coming Soon
28238 FBZ 8 Ld SOIC
ISL28238FBZ-T7*
MDP0027
Coming Soon
ISL28238FUZ
8238Z
8 Ld MSOP MDP0043
Coming Soon
8238Z
ISL28238FUZ-T7*
8 Ld MSOP MDP0043
*Please refer to TB347 for details on reel specifications.
NOTE: These Intersil Pb-free plastic packaged products employ
special Pb-free material sets; molding compounds/die attach
materials and 100% matte tin plate PLUS ANNEAL - e3 termination
finish, which is 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.
Features
• 4.5MHz gain bandwidth product
• 900µA supply current (per amplifier)
• 300µV maximum offset voltage
• 1pA typical input bias current
• Down to 2.4V single supply voltage range
• Rail-to-rail input and output
• Output sources and sinks 60mA load current
• Enable pin (ISL28138)
• -40°C to +125°C operation
• Pb-free (RoHS compliant)
Applications
• Low-end audio
• 4mA to 20mA current loops
• Medical devices
• Sensor amplifiers
• ADC buffers
• DAC output amplifiers
Pinouts
ISL28138
(6 LD SOT-23)
TOP VIEW
OUT 1
6 V+
V- 2
5 EN
+-
IN+ 3
4 IN-
ISL28138
(8 LD SO)
TOP VIEW
NC 1
8 EN
IN- 2
IN+ 3
-
+
7 V+
6 OUT
V- 4
5 NC
ISL28238
(8 LD SO)
TOP VIEW
OUT_A 1
8 V+
ISL28238
(8 LD MSOP)
TOP VIEW
OUT_A 1
8 V+
IN-_A 2
IN+_A 3
V- 4
-+
+-
7 OUT_B IN-_A 2
6 IN-_B IN+_A 3
5 IN+_B
V- 4
-+
+-
7 OUT_B
6 IN-_B
5 IN+_B
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. 2007, 2008. All Rights Reserved.
All other trademarks mentioned are the property of their respective owners.
1 page  
ISL28138, ISL28238
Typical Performance Curves V+ = 5V, V- = 0V,VCM = 2.5V, RL = Open, unless otherwise specified. (Continued)
1
0
-1 V+ = 5V
-2
-3
www.datash-4eet4u.com
V+ = 2.4V
-5
-6 RL = 10k
CL = 16.3pF
-7 AV = +1
-8 VOUT = 10mVP-P
-9
10k
100k
1M
FREQUENCY (Hz)
10M
100M
FIGURE 7. GAIN vs FREQUENCY vs SUPPLY VOLTAGE
8
7
6
5
4
3
2
1
0
-1
-2
-3 V+ = 5V
-4 RL = 1k
-5
-6
-7
AV = +1
VOUT = 10mVP-P
-8
10k
100k
CL = 51.7pF
CL = 43.7pF
CL = 37.7pF
CL = 26.7pF
CL = 16.7pF
CL = 4.7pF
1M
10M
FREQUENCY (Hz)
FIGURE 8. GAIN vs FREQUENCY vs CL
100M
10
0
-10
-20
-30
-40
-50
-60
-70
-80
-90
100
V+ = 2.4V, 5V
RL = 1k
CL = 16.3pF
AV = +1
VCM = 1VP-P
1k
10k 100k
1M
FREQUENCY (Hz)
10M
FIGURE 9. CMRR vs FREQUENCY; V+ = 2.4V AND 5V
20
0
-20 PSRR-
-40
-60
PSRR+
V+, V- = ±1.2V
-80 RL = 1k
CL = 16.3pF
-100
AV = +1
-120
VCM = 1VP-P
100 1k 10k 100k 1M 10M
FREQUENCY (Hz)
FIGURE 10. PSRR vs FREQUENCY, V+, V- = ±1.2V
20
0
-20 PSRR-
-40
-60
PSRR+
V+, V- = ±2.5V
-80 RL = 1k
CL = 16.3pF
-100
AV = +1
-120
VCM = 1VP-P
100 1k 10k 100k 1M 10M
FREQUENCY (Hz)
FIGURE 11. PSRR vs FREQUENCYV, V+, V- = ±2.5V
1k
V+ = 5V
RL = 1k
CL = 16.3pF
AV = +1
100
10
1 10 100 1k 10k 100k
FREQUENCY (Hz)
FIGURE 12. INPUT VOLTAGE NOISE DENSITY vs FREQUENCY
5 FN6336.2
February 19, 2008
5 Page 
Pin Descriptions
ISL28138
(6 Ld SOT-23)
4
www.datasheet4u.com
ISL28138
(8 Ld SOIC)
1, 5
2
33
24
16
ISL28138, ISL28238
ISL28238
(8 Ld SOIC)
(8 Ld MSOP)
2 (A)
6 (B)
3 (A)
5 (B)
4
1 (A)
7 (B)
PIN NAME
NC
IN-
IN-_A
IN-_B
FUNCTION
Not connected
inverting input
IN+
IN+_A
IN+_B
Non-inverting
input
EQUIVALENT CIRCUIT
IN-
(See circuit 1)
Circuit 1
V+
IN+
V-
V- Negative supply
OUT
OUT_A
OUT_B
Output
V+
CAPACITIVELY
COUPLED
ESD CLAMP
V-
Circuit 2
V+
OUT
67
58
8 V+
EN
Applications Information
Introduction
The ISL28138 and ISL28238 are single and dual channel
CMOS rail-to-rail input, output (RRIO) micropower precision
operational amplifiers. The parts are designed to operate
from single supply (2.4V to 5.5V) or dual supply (±1.2V to
±2.75V). The parts have an input common mode range that
extends 0.25V above the positive rail and 100mV below the
the negative supply rail. The output operation can swing
within about 3mV of the supply rails with a 100kΩ load.
Rail-to-Rail Input
Many rail-to-rail input stages use two differential input pairs,
a long-tail PNP (or PFET) and an NPN (or NFET). Severe
penalties have to be paid for this circuit topology. As the
Positive supply
Chip enable
(See circuit 2)
Circuit 3
V-
V+
EN
Circuit 4
V-
input signal moves from one supply rail to another, the
operational amplifier switches from one input pair to the
other causing drastic changes in input offset voltage and an
undesired change in magnitude and polarity of input offset
current.
The ISL28138 and ISL28238 achieve input rail-to-rail
operation without sacrificing important precision
specifications and degrading distortion performance. The
devices’ input offset voltage exhibits a smooth behavior
throughout the entire common-mode input range. The input
bias current versus the common-mode voltage range gives
us an undistorted behavior from typically 100mV below the
negative rail and 0.25V higher than the V+ rail.
11 FN6336.2
February 19, 2008
11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet ISL28138.PDF ] | |
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