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Analog Devices Semiconductor Electronic Components Datasheet

AD8505 Datasheet

Zero Input Crossover Distortion Amplifiers

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AD8505 pdf
20 μA Maximum, Rail-to-Rail I/O,
Zero Input Crossover Distortion Amplifiers
AD8505/AD8506/AD8508
FEATURES
PSRR: 100 dB minimum
CMRR: 105 dB typical
Very low supply current: 20 μA per amplifier maximum
1.8 V to 5 V single supply or ±0.9 V to ±2.5 V dual supply
Rail-to-rail input/output
Low noise: 45 nV/√Hz at 1 kHz
2.5 mV offset voltage maximum
Very low input bias current: 1 pA typical
APPLICATIONS
Pressure and position sensors
Remote security
Bio sensors
IR thermometers
Battery-powered consumer equipment
Hazard detectors
GENERAL DESCRIPTION
The AD8505/AD8506/AD8508 are single, dual, and quad micro-
power amplifiers featuring rail-to-rail input/output swings while
operating from a single 1.8 V to 5 V power supply or from dual
±0.9 V to ±2.5 V power supplies. Using a new circuit technology,
these amplifiers offer zero input crossover distortion (excellent
PSRR and CMRR performance) and low bias current while
operating with a supply current of less than 20 μA per amplifier.
This amplifier family offers the lowest noise in its power class.
This combination of features makes the AD8505/AD8506/AD8508
amplifiers ideal choices for battery-powered applications because
they minimize errors due to power supply voltage variations over
the lifetime of the battery and maintain high CMRR even for a rail-
to-rail input op amp. Remote battery-powered sensors, handheld
instrumentation, consumer equipment, hazard detection (for
example, smoke, fire, and gas), and patient monitors can benefit
from the features of the AD8505/AD8506/AD8508 amplifiers.
The AD8505/AD8506/AD8508 are specified for both the industrial
temperature range of −40°C to +85°C and the extended industrial
temperature range of −40°C to +125°C. The AD8505 single ampli-
fier is available in a tiny 5-lead SOT-23 and a 6-ball WLCSP
packages. The AD8506 dual amplifier is available in 8-lead MSOP
and 8-ball WLCSP packages. The AD8508 quad amplifier is
available in 14-lead TSSOP and 14-ball WLCSP packages. The
AD8505/AD8506/AD8508 are members of a growing series of
zero crossover distortion op amps offered by Analog Devices,
Inc., including the ADA4505-1/ADA4505-2/ADA4505-4, that
operate from a single 1.8 V to 5 V supply or from dual ±0.9 V to
±2.5 V power supplies.
PIN CONFIGURATIONS
BALL A1
INDICATOR
OUT 1
5 V+
AD8505
V– 2 TOP VIEW
(Not to Scale)
+IN 3
4 –IN
Figure 1. 5-Lead SOT-23 (RJ-5)
OUT V+
A1 A2
V– NC
B1 B2
+IN –IN
C1 C2
AD8505
TOP VIEW
(BALL SIDE DOWN)
Not to Scale
NC = NO CONNECT
Figure 2. 6-Ball WLCSP (CB-6-7)
OUT A 1
–IN A 2
+IN A 3
V– 4
AD8506
TOP VIEW
(Not to Scale)
8 V+
7 OUT B
6 –IN B
5 +IN B
Figure 3. 8-Lead MSOP (RM-8)
BALL A1
CORNER
OUT B
A1
V+
A2
–IN B
B1
+IN B
C1
V–
C2
OUT A
A3
–IN A
B3
+IN A
C3
AD8506
TOP VIEW
(BALL SIDE DOWN)
Not to Scale
Figure 4. 8-Ball WLCSP (CB-8-2)
OUT A 1
14 OUT D
–IN A 2
13 –IN D
+IN A 3 AD8508 12 +IN D
V+ 4 TOP VIEW 11 V–
+IN B 5 (Not to Scale) 10 +IN C
–IN B 6
9 –IN C
OUT B 7
8 OUT C
Figure 5. 14-Lead TSSOP (RU-14)
BALL A1
CORNER
OUTD
A1
OUTA
A2
–INA
A3
–IND V– +INA
B1 B2 B3
+IND
C1
+INB
C3
+INC V+ –INB
D1 D2 D3
–INC
E1
OUTC
E2
OUTB
E3
AD8508
TOP VIEW
(BALL SIDE DOWN)
Not to Scale
Figure 6. 14-Ball WLCSP (CB-14-1)
Rev. E
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other
rights of third parties that may result from its use. Specifications subject to change without notice. No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
www.analog.com
Fax: 781.461.3113 ©2007–2010 Analog Devices, Inc. All rights reserved.


Analog Devices Semiconductor Electronic Components Datasheet

AD8505 Datasheet

Zero Input Crossover Distortion Amplifiers

No Preview Available !

AD8505 pdf
AD8505/AD8506/AD8508
TABLE OF CONTENTS
Features .............................................................................................. 1
Applications....................................................................................... 1
General Description ......................................................................... 1
Pin Configurations ........................................................................... 1
Revision History ............................................................................... 2
Specifications..................................................................................... 3
Electrical Characteristics—1.8 V Operation ............................ 3
Electrical Characteristics—5 V Operation................................ 4
Absolute Maximum Ratings............................................................ 5
Thermal Resistance ...................................................................... 5
ESD Caution...................................................................................5
Typical Performance Characteristics ..............................................6
Theory of Operation ...................................................................... 13
Applications Information .............................................................. 15
Pulse Oximeter Current Source ............................................... 15
Four-Pole, Low-Pass Butterworth Filter for Glucose
Monitor........................................................................................ 16
Outline Dimensions ....................................................................... 17
Ordering Guide .......................................................................... 20
REVISION HISTORY
5/10—Rev. D to Rev. E
Added AD8505, 6-Ball WLCSP Package.........................Universal
Changes to Large-Signal Voltage Gain Parameter (Table 1)....... 4
Changes to Large-Signal Voltage Gain Parameter (Table 2)....... 5
Changes to Table 4............................................................................ 6
Updated Outline Dimensions ....................................................... 19
Changes to Ordering Guide .......................................................... 21
10/09—Rev. C to Rev. D
Added AD8505, 5-Lead SOT-23 Package .......................Universal
Changes to General Description, Added Figure 1 ....................... 1
Moved Electrical Characteristics—1.8 V Operation Section,
Changes to Supply Current per Amplifier Parameter, Table 1 .....3
Moved Electrical Characteristics—5 V Operation Section,
Changes to Supply Current per Amplifier Parameter, Table 2 .....4
Changes to Thermal Resistance Section and Table 4................... 5
Changes to Figure 20 and Figure 23............................................... 8
Updated Outline Dimensions ....................................................... 16
Changes to Ordering Guide .......................................................... 17
3/09—Rev. B to Rev. C
Added AD8508, 14-Ball WLCSP Package.......................Universal
Updated Outline Dimensions ....................................................... 17
Changes to Ordering Guide .......................................................... 18
10/08—Rev. A to Rev. B
Added WLCSP Package .....................................................Universal
Added Figure 2; Renumbered Sequentially .................................. 1
Added Input Resistance Parameter ................................................ 3
Changes to Input Capacitance Differential Mode Parameter
Symbol and Input Capacitance Common Mode Parameter
Symbol................................................................................................ 3
Added Input Resistance Parameter ................................................ 4
Changes to Input Capacitance Differential Mode Parameter
Symbol and Input Capacitance Common Mode Parameter
Symbol................................................................................................ 4
Changes to Table 4.............................................................................5
Changes to Figure 46...................................................................... 16
Updated Outline Dimensions....................................................... 17
Added Figure 49 ............................................................................. 17
Changes to Ordering Guide .......................................................... 18
7/08—Rev. 0 to Rev. A
Added AD8508 ...................................................................Universal
Added TSSOP Package ......................................................Universal
Changes to Features Section and General Description Section..1
Added Figure 2; Renumbered Sequentially ...................................1
Changed Electrical Characteristics Heading to Electrical
Characteristics—5 V Operation ......................................................3
Changes to Table 1.............................................................................3
Added Electrical Characteristics—1.8 V Operation Heading.....4
Changes to Table 2.............................................................................4
Changes to Table 3, Thermal Resistance Section, and Table 4....5
Added TA = 25°C Condition to Typical Performance
Characteristics Section .....................................................................6
Changes to Figure 3, Figure 4, Figure 6, and Figure 7 ..................6
Added Figure 11 and Figure 14 .......................................................7
Changes to Figure 17 Through Figure 20.......................................8
Changes to Figure 21 Through Figure 26.......................................9
Changes to Figure 27, Figure 28, Figure 30, and Figure 31....... 10
Changes to Figure 34, Figure 37, and Figure 38 ......................... 11
Added Figure 39 and Figure 40 .................................................... 12
Added Theory of Operation Section, Figure 41, and
Figure 42 .......................................................................................... 13
Added Figure 43 and Figure 44 .................................................... 14
Added Applications Information Section and Figure 45 .......... 15
Added Figure 46 ............................................................................. 16
Updated Outline Dimensions....................................................... 17
Added Figure 48 ............................................................................. 17
Changes to Ordering Guide .......................................................... 17
11/07—Revision 0: Initial Version
Rev. E | Page 2 of 20


Part Number AD8505
Description Zero Input Crossover Distortion Amplifiers
Maker Analog Devices
Total Page 20 Pages
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