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AD8508 데이터시트 PDF




Analog Devices에서 제조한 전자 부품 AD8508은 전자 산업 및 응용 분야에서
광범위하게 사용되는 반도체 소자입니다.


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부품번호 AD8508 기능
기능 Zero Input Crossover Distortion Amplifiers
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AD8508 데이터시트, 핀배열, 회로
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.




AD8508 pdf, 반도체, 판매, 대치품
AD8505/AD8506/AD8508
ELECTRICAL CHARACTERISTICS—5 V OPERATION
VSY = 5 V, VCM = VSY/2, TA = 25°C, RL = 100 kΩ to GND, unless otherwise noted.
Table 2.
Parameter
Symbol Conditions
Min Typ Max Unit
INPUT CHARACTERISTICS
Offset Voltage
VOS 0 V ≤ VCM ≤ 5 V
0.5 2.5 mV
−40°C ≤ TA ≤ +125°C
3.5 mV
Input Bias Current
IB
1 10 pA
−40°C ≤ TA ≤ +85°C
100 pA
−40°C ≤ TA ≤ +125°C
600 pA
Input Offset Current
IOS
0.5 5
pA
−40°C ≤ TA ≤ +85°C
50 pA
−40°C ≤ TA ≤ +125°C
130 pA
Input Voltage Range
−40°C ≤ TA ≤ +125°C
0
5V
Common-Mode Rejection Ratio
CMRR
0 V ≤ VCM ≤ 5 V
90 105
dB
−40°C ≤ TA ≤ +85°C
90
dB
−40°C ≤ TA ≤ +125°C
85
dB
Large-Signal Voltage Gain
AVO 0.05 V ≤ VOUT ≤ 4.95 V,
RL = 100 kΩ to VCM
105 120
dB
−40°C ≤ TA ≤ +125°C
100
dB
Offset Voltage Drift
ΔVOS/ΔT −40°C ≤ TA ≤ +125°C
2 μV/°C
Input Resistance
RIN
220 GΩ
Input Capacitance, Differential Mode CINDM
3 pF
Input Capacitance, Common Mode CINCM
4.2 pF
OUTPUT CHARACTERISTICS
Output Voltage High
VOH RL = 100 kΩ to GND
4.98 4.99
V
−40°C ≤ TA ≤ +125°C
4.98
V
RL = 10 kΩ to GND
4.9 4.95
V
−40°C ≤ TA ≤ +125°C
4.9
V
Output Voltage Low
VOL RL = 100 kΩ to VSY
2 5 mV
−40°C ≤ TA ≤ +125°C
5 mV
RL = 10 kΩ to VSY
10 25 mV
−40°C ≤ TA ≤ +125°C
30 mV
Short-Circuit Limit
ISC VOUT = VSY or GND
±45 mA
POWER SUPPLY
Power Supply Rejection Ratio
PSRR
VSY = 1.8 V to 5 V
100 110
dB
−40°C ≤ TA ≤ +85°C
100
dB
−40°C ≤ TA ≤ +125°C
95
dB
Supply Current per Amplifier
ISY
AD8506/AD8508
VOUT = VSY/2
15 20 μA
−40°C ≤ TA ≤ +125°C
25 μA
AD8505
−40°C ≤ TA ≤ +125°C
25.5 μA
DYNAMIC PERFORMANCE
Slew Rate
SR RL = 100 kΩ, CL = 10 pF, G = 1
13
mV/μs
Gain Bandwidth Product
GBP RL = 1 MΩ, CL = 20 pF, G = 1
95
kHz
Phase Margin
ΦM RL = 1 MΩ, CL = 20 pF, G = 1
60
Degrees
NOISE PERFORMANCE
Voltage Noise
en p-p
f = 0.1 Hz to 10 Hz
2.8 μV p-p
Voltage Noise Density
en f = 1 kHz
45 nV/√Hz
Current Noise Density
in f = 1 kHz
15 fA/√Hz
Rev. E | Page 4 of 20

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AD8508 전자부품, 판매, 대치품
TA = 25°C, unless otherwise noted.
–115
–120
VSY = 1.8V
–125
–130
–135
–140
0
0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8
VCM (V)
Figure 13. Input Offset Voltage vs. Input Common-Mode Voltage
600
VSY = 1.8V
550
500
450
400
350
300
250
200
0
0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8
VCM (V)
Figure 14. Input Bias Current vs. Input Common-Mode Voltage at 125°C
1000
VSY = 1.8V
VCM = VSY/2
100
10
1
0.1
0.01
25
35 45 55 65 75 85 95 105 115
TEMPERATURE (°C)
Figure 15. Input Bias Current vs. Temperature
125
AD8505/AD8506/AD8508
–120
–125
VSY = 5V
–130
–135
–140
–145
–150
012345
VCM (V)
Figure 16. Input Offset Voltage vs. Input Common-Mode Voltage
600
VSY = 5V
550
500
450
400
350
300
250
200
0
0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0
VCM (V)
Figure 17. Input Bias Current vs. Input Common-Mode Voltage at 125°C
1000
VSY = 5V
VCM = VSY/2
100
10
1
0.1
0.01
25
35 45 55 65 75 85 95 105 115
TEMPERATURE (°C)
Figure 18. Input Bias Current vs. Temperature
125
Rev. E | Page 7 of 20

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