Document
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 micropower 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 railto-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 amplifier 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)
06900-051 06900-100
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)
06900-002 06900-001
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)
06900-045 06900-104
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
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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 Perfo.