AD AD8519AKS

8 MHz Rail-to-Rail
Operational Amplifiers
AD8519/AD8529
FEATURES
Space-Saving SC70 and SOT-23 Packaging
Wide Bandwidth: 8 MHz @ 5 V
Low Offset Voltage: 1.2 mV Max
Rail-to-Rail Output Swing
2.7 V/ms Slew Rate
Unity Gain Stable
Single-Supply Operation: 2.7 V to 12 V
APPLICATIONS
Portable Communications
Microphone Amplifiers
Portable Phones
Sensor Interface
Active Filters
PCMCIA Cards
ASIC Input Drivers
Wearable Computers
Battery-Powered Devices
Voltage Reference Buffers
Personal Digital Assistants
PIN CONFIGURATIONS
8-Lead SOIC
(R Suffix)
NC 1
8 NC
7 V+
+IN A 3
6 OUT A
5 NC
Vⴚ 4
NC = NO CONNECT
5-Lead SC70 and SOT-23
(KS and RT Suffixes)
OUT A 1
AD8519
5 V+
Vⴚ 2
4 ⴚIN A
+IN A 3
8-Lead SOIC and MSOP
(R and RM Suffixes)
GENERAL DESCRIPTION
The AD8519 and AD8529 are rail-to-rail output bipolar amplifiers with a unity gain bandwidth of 8 MHz and a typical voltage
offset of less than 1 mV. The AD8519 brings precision and
bandwidth to the SC70 and SOT-23 packages. The low supply
current makes the AD8519/AD8529 ideal for battery-powered
applications. The rail-to-rail output swing of the AD8519/AD8529
is larger than standard video op amps, making them useful in
applications that require greater dynamic range than standard
video op amps. The 2.7 V/ms slew rate makes the AD8519/AD8529
a good match for driving ASIC inputs such as voice codecs.
AD8519
ⴚIN A 2
OUT A 1
AD8529
8 V+
–IN A 2
7 OUT B
+IN A 3
6 –IN B
V– 4
5 +IN B
The small SC70 package makes it possible to place the AD8519
next to sensors, reducing external noise pickup.
The AD8519/AD8529 is specified over the extended industrial
(–40∞C to +125∞C) temperature range. The AD8519 is available
in 5-lead SC70 and SOT-23 packages and an 8-lead SOIC
surface-mount package. The AD8529 is available in 8-lead SOIC
and MSOP packages.
REV. C
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. No license is granted by implication or otherwise
under any patent or patent rights of Analog Devices. Trademarks and
registered trademarks are the property of their respective companies.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781/329-4700
www.analog.com
Fax: 781/326-8703
© 2003 Analog Devices, Inc. All rights reserved.
AD8519/AD8529–SPECIFICATIONS
ELECTRICAL CHARACTERISTICS (V = 5.0 V, V– = 0 V, V
S
CM
= 2.5 V, TA = 25ⴗC, unless otherwise noted.)
Parameter
Symbol
Conditions
INPUT CHARACTERISTICS
Offset Voltage
VOS
AD8519AKS, AD8519ART
–40∞C £ TA £ +125∞C
AD8519AR (R-8), AD8529
–40∞C £ TA £ +125∞C
Input Bias Current
IB
Input Offset Current
IOS
Input Voltage Range
Common-Mode Rejection Ratio
VCM
CMRR
Large Signal Voltage Gain
AVO
Offset Voltage Drift
Bias Current Drift
OUTPUT CHARACTERISTICS
Output Voltage Swing High
Output Voltage Swing Low
Short-Circuit Current
Maximum Output Current
POWER SUPPLY
Power Supply Rejection Ratio
Supply Current/Amplifier
DVOS/DT
DIB/DT
VOH
VOL
ISC
IOUT
PSRR
ISY
Min
Typ
Max
Unit
600
800
600
1,100
1,300
1,000
1,100
300
400
± 50
± 100
4
mV
mV
mV
mV
nA
nA
nA
nA
V
–40∞C £ TA £ +125∞C
–40∞C £ TA £ +125∞C
0 V £ VCM £ 4.0 V,
–40∞C £ TA £ +125∞C
RL = 2 kW, 0.5 V < VOUT < 4.5 V
RL = 10 kW, 0.5 V < VOUT < 4.5 V
RL = 10 kW, –40∞C £ TA £ +125∞C
IL = 250 mA
–40∞C £ TA £ +125∞C
IL = 5 mA
IL = 250 mA
–40∞C £ TA £ +125∞C
IL = 5 mA
Short to Ground, Instantaneous
0
63
50
30
100
30
100
dB
V/mV
V/mV
V/mV
mV/∞C
pA/∞C
2
500
4.90
4.80
V
V
± 70
± 25
VS = 2.7 V to 7 V,
–40∞C £ TA £ +125∞C
VOUT = 2.5 V
–40∞C £ TA £ +125∞C
110
80
600
80
200
1,200
1,400
mV
mV
mA
mA
dB
dB
mA
mA
DYNAMIC PERFORMANCE
Slew Rate
Settling Time
Gain Bandwidth Product
Phase Margin
SR
tS
GBP
fm
1 V < VOUT < 4 V, RL = 10 kW
To 0.01%
2.9
1,200
8
60
V/ms
ns
MHz
Degrees
NOISE PERFORMANCE
Voltage Noise
Voltage Noise Density
Current Noise Density
en p-p
en
in
0.1 Hz to 10 Hz
f = 1 kHz
f = 1 kHz
0.5
10
0.4
mV p-p
nV/÷Hz
pA/÷Hz
Specifications subject to change without notice.
–2–
REV. C
AD8519/AD8529
ELECTRICAL CHARACTERISTICS (V = 3.0 V, V– = 0 V, V
S
CM
= 1.5 V, TA = 25ⴗC, unless otherwise noted.)
Parameter
Symbol
Conditions
INPUT CHARACTERISTICS
Offset Voltage
VOS
AD8519AKS, AD8519ART
–40∞C £ TA £ +125∞C
AD8519AR (R-8), AD8529
–40∞C £ TA £ +125∞C
Input Bias Current
Input Offset Current
Input Voltage Range
Common-Mode Rejection Ratio
IB
IOS
VCM
CMRR
Large Signal Voltage Gain
AVO
OUTPUT CHARACTERISTICS
Output Voltage Swing High
Output Voltage Swing Low
POWER SUPPLY
Power Supply Rejection Ratio
Supply Current/Amplifier
VOH
VOL
PSRR
ISY
0 V £ VCM £ 2.0 V,
–40∞C £ TA £ +125∞C
RL = 2 kW, 0.5 V < VOUT < 2.5 V
RL = 10 kW
IL = 250 mA
IL = 5 mA
IL = 250 mA
IL = 5 mA
VS = 2.5 V to 7 V,
–40∞C £ TA £ +125∞C
VOUT = 1.5 V
–40∞C £ TA £ +125∞C
Min
Typ
Max
Unit
700
900
700
1,200
1,400
1,100
1,200
300
± 50
2
mV
mV
mV
mV
nA
nA
V
0
55
20
75
20
30
dB
V/mV
V/mV
2.90
2.80
60
80
600
100
200
V
V
mV
mV
1,100
1,300
dB
mA
mA
DYNAMIC PERFORMANCE
Slew Rate
Settling Time
Gain Bandwidth Product
Phase Margin
SR
tS
GBP
fm
RL = 10 kW
To 0.01%
1.5
2,000
6
55
V/ms
ns
MHz
Degrees
NOISE PERFORMANCE
Voltage Noise Density
Current Noise Density
en
in
f = 1 kHz
f = 1 kHz
10
0.4
nV/÷Hz
pA/÷Hz
Specifications subject to change without notice.
REV. C
–3–
AD8519/AD8529–SPECIFICATIONS
ELECTRICAL CHARACTERISTICS (V = 2.7 V, V– = 0 V, V
S
CM
= 1.35 V, TA = 25ⴗC, unless otherwise noted.)
Parameter
Symbol
Conditions
INPUT CHARACTERISTICS
Offset Voltage
VOS
AD8519AKS, AD8519ART
–40∞C £ TA £ +125∞C
AD8519AR (R-8), AD8529
–40∞C £ TA £ +125∞C
Input Bias Current
Input Offset Current
Input Voltage Range
Common-Mode Rejection Ratio
IB
IOS
VCM
CMRR
Large Signal Voltage Gain
AVO
OUTPUT CHARACTERISTICS
Output Voltage Swing High
Output Voltage Swing Low
POWER SUPPLY
Power Supply Rejection Ratio
Supply Current/Amplifier
VOH
VOL
PSRR
ISY
0 V £ VCM £ 1.7 V,
–40∞C £ TA £ +125∞C
RL = 2 kW, 0.5 V < VOUT < 2.2 V
RL = 10 kW
IL = 250 mA
IL = 5 mA
IL = 250 mA
IL = 5 mA
VS = 2.5 V to 7 V,
–40∞C £ TA £ +125∞C
VOUT = 1.35 V
–40∞C £ TA £ +125∞C
Min
Typ
Max
Unit
700
900
700
1,400
1,600
1,200
1,300
300
± 50
2
mV
mV
mV
mV
nA
nA
V
0
55
20
75
20
30
dB
V/mV
V/mV
2.60
2.50
60
80
600
100
200
V
V
mV
mV
1,100
1,300
dB
mA
mA
DYNAMIC PERFORMANCE
Slew Rate
Settling Time
Gain Bandwidth Product
Phase Margin
SR
tS
GBP
fm
RL = 10 kW
To 0.01%
1.5
2,000
6
55
V/ms
ns
MHz
Degrees
NOISE PERFORMANCE
Voltage Noise Density
Current Noise Density
en
in
f = 1 kHz
f = 1 kHz
10
0.4
nV/÷Hz
pA/÷Hz
Specifications subject to change without notice.
–4–
REV. C
AD8519/AD8529
ELECTRICAL CHARACTERISTICS (V = 5.0 V, V– = –5 V, V
S
CM
= 0 V, TA = 25ⴗC, unless otherwise noted.)
Parameter
Symbol
Conditions
INPUT CHARACTERISTICS
Offset Voltage
VOS
AD8519AKS, AD8519ART
–40∞C £ TA £ +125∞C
AD8519AR (R-8), AD8529
–40∞C £ TA £ +125∞C
VCM = 0 V
VCM = 0 V, –40∞C £ TA £ +125∞C
VCM = 0 V
VCM = 0 V, –40∞C £ TA £ +125∞C
Input Bias Current
IB
Input Offset Current
IOS
Input Voltage Range
Common-Mode Rejection Ratio
VCM
CMRR
Large Signal Voltage Gain
AVO
Offset Voltage Drift
Bias Current Drift
OUTPUT CHARACTERISTICS
Output Voltage Swing High
Output Voltage Swing Low
Short-Circuit Current
Maximum Output Current
POWER SUPPLY
Power Supply Rejection Ratio
Supply Current/Amplifier
DVOS/DT
DIB/DT
VOH
VOL
ISC
IOUT
PSRR
ISY
Min
–4.9 V £ VCM £ +4.0 V,
–40∞C £ TA £ +125∞C
RL = 2 kW
RL = 10 kW
–40∞C £ TA £ +125∞C
IL = 250 mA
–40∞C £ TA £ +125∞C
IL = 5 mA
IL = 250 mA
–40∞C £ TA £ +125∞C
IL = 5 mA
Short to Ground, Instantaneous
VS = ± 1.5 V to ± 6 V,
–40∞C £ TA £ +125∞C
VOUT = 0 V
–40∞C £ TA £ +125∞C
Typ
Max
Unit
600
800
600
1,100
1,300
1,000
1,100
300
400
± 50
± 100
+4
mV
mV
mV
mV
nA
nA
nA
nA
V
–5
70
50
25
100
30
200
dB
V/mV
V/mV
V/mV
mV/∞C
pA/∞C
2
500
4.90
4.80
V
V
± 70
± 25
60
100
600
–4.90
–4.80
1,200
1,400
V
V
mA
mA
dB
mA
mA
DYNAMIC PERFORMANCE
Slew Rate
Settling Time
Gain Bandwidth Product
Phase Margin
SR
tS
GBP
fm
–4 V < VOUT < +4 V, RL = 10 kW
To 0.01%
2.9
1,000
8
60
V/ms
ns
MHz
Degrees
NOISE PERFORMANCE
Voltage Noise Density
Current Noise Density
en
in
f = 1 kHz
f = 1 kHz
10
0.4
nV/÷Hz
pA/÷Hz
Specifications subject to change without notice.
REV. C
–5–
AD8519/AD8529
ABSOLUTE MAXIMUM RATINGS
1
Supply Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ± 6 V
Input Voltage2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ± 6 V
Differential Input Voltage3 . . . . . . . . . . . . . . . . . . . . . . . ± 0.6 V
Storage Temperature Range . . . . . . . . . . . . –65∞C to +150∞C
Operating Temperature Range . . . . . . . . . . –40∞C to +125∞C
Junction Temperature Range . . . . . . . . . . . . –65∞C to +150∞C
Lead Temperature Range (Soldering, 60 sec) . . . . . . . . . 300∞C
Package Type
␪JA*
␪JC
Unit
5-Lead SC70 (KS)
5-Lead SOT-23 (RT)
8-Lead SOIC (R)
8-Lead MSOP (RM)
376
230
158
210
126
146
43
45
∞C/W
∞C/W
∞C/W
∞C/W
*qJA is specified for worst-case conditions, i.e., qJA is specified for device soldered
in circuit board for SOT-23 and SOIC packages.
NOTES
1
Stresses above those listed under Absolute Maximum Ratings may cause permanent damage to the device. This is a stress rating only; functional operation of the
device at these or any other conditions above those listed in the operational sections
of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.
2
For supply voltages less than ± 6 V, the input voltage is limited to less than or equal
to the supply voltage.
3
For differential input voltages greater than ± 0.6 V, the input current should be
limited to less than 5 mA to prevent degradation or destruction of the input devices.
ORDERING GUIDE
Model
Temperature
Range
Package
Description
Package
Option
Branding
Information
AD8519AKS*
AD8519ART*
AD8519AR
AD8529AR
AD8529ARM*
–40∞C to +125∞C
–40∞C to +125∞C
–40∞C to +125∞C
–40∞C to +125∞C
–40∞C to +125∞C
5-Lead SC70
5-Lead SOT-23
8-Lead SOIC
8-Lead SOIC
8-Lead MSOP
KS-5
RT-5
R-8
R-8
RM-8
A3B
A3A
A5A
*Available in reels only.
CAUTION
ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily
accumulate on the human body and test equipment and can discharge without detection. Although the
AD8519/AD8529 feature proprietary ESD protection circuitry, permanent damage may occur on
devices subjected to high energy electrostatic discharges. Therefore, proper ESD precautions are
recommended to avoid performance degradation or loss of functionality.
–6–
REV. C
Typical Performance Characteristics–AD8519/AD8529
60
VS = 5V
TA = 25ⴗC
600
800
COUNT = 395 OP AMPS
VS = 5V
40
30
20
SUPPLY CURRENT – ␮A
SUPPLY CURRENT – ␮A
550
500
0
ⴚ1.0
ⴚ0.6
ⴚ0.2
0.2
0.6
INPUT OFFSET VOLTAGE – mV
450
1.0
0
TPC 1. Input Offset Voltage
Distribution
2
4
6
8
SUPPLY VOLTAGE – V
10
VS = 2.7V, 3.0V
300
ⴚ50 ⴚ25
12
ⴚ40
ⴚ80
ⴚ120
ⴚ160
ⴚ200
2
3
4
1
COMMON-MODE VOLTAGE – V
40
40
0
1
2
3
4
COMMON-MODE VOLTAGE – V
5
ⴚ20
100k
1M
10M
FREQUENCY – Hz
TPC 7. Closed-Loop Gain vs.
Frequency
100M
PHASE
135
0
180
ⴚ10
225
ⴚ20
270
ⴚ30
100k
1M
10M
FREQUENCY – Hz
100M
TPC 6. Open-Loop Gain, Phase vs.
Frequency
90
70
80
60
70
60
50
30
30
10
TPC 8. CMRR vs. Frequency
–7–
10M
+PSRR
40
20
100k
1M
FREQUENCY – Hz
ⴚPSRR
50
40
10k
VS = 5V
TA = 25ⴗC
80
90
20
1k
90
10
VS = 5V
TA = 25ⴗC
100
CMRR – dB
0
REV. C
60
45
20
110
VS = 5V
RL = 830⍀
TA = 25ⴗC
CL 5pF
20
ⴚ40
10k
80
TPC 5. Common-Mode Rejection vs.
Common-Mode Voltage
60
GAIN
30
20
5
TPC 4. Input Bias Current vs.
Common-Mode Voltage
VS = 5V
TA = 25ⴗC
40
100
PSRR – dB
0
25
50
75 100 125 150
TEMPERATURE – ⴗC
50
VS = 5V
GAIN – dB
COMMON-MODE REJECTION – dB
VS = 5V
TA = 25ⴗC
0
TPC 3. Supply Current per
Amplifier vs. Temperature
120
0
INPUT BIAS CURRENT – nA
VS = 10V
500
TPC 2. Supply Current per
Amplifier vs. Supply Voltage
40
CLOSED-LOOP GAIN – dB
600
400
10
ⴚ240
700
0
1k
10k
100k
1M
FREQUENCY – Hz
TPC 9. PSRR vs. Frequency
10M
PHASE SHIFT – Degrees
QUANTITY AMPLIFIERS
50
AD8519/AD8529
60
4
40
3
0.1%
30
ⴚOS
20
ⴚ1
1%
ⴚ3
10
100
CAPACITANCE – pF
ⴚ4
1k
TPC 10. Overshoot vs. Capacitance
Load
0
3
DISTORTION < 1%
2
1
0
10k
2.0
1.0
SETTLING TIME – ␮s
AVCC = 10
150
100
AVCC = 1
50
0
100k
70
60
50
40
30
20
10
10M
TPC 13. Output Impedance vs.
Frequency
VS = ⴞ2.5V
AV = 100k⍀
en = 0.4␮V p-p
20mV
1s
TPC 16. 0.1 Hz to 10 Hz Noise
VS = 5V
TA = 25ⴗC
7
6
5
4
3
2
1
0
0
1M
FREQUENCY – Hz
10M
8
VS = 5V
TA = 25ⴗC
CURRENT NOISE DENSITY – pA/ Hz
VOLTAGE NOISE DENSITY – nV/ Hz
200
100k
1M
FREQUENCY – Hz
TPC 12. Output Swing vs.
Frequency
80
VS = 5V
TA = 25ⴗC
VS = 5V
AVCC = 1
RL = 10k⍀
TA = 25ⴗC
CL = 15pF
4
TPC 11. Step Size vs. Settling Time
300
OUTPUT IMPEDANCE – ⍀
0
0.1%
10
250
1
ⴚ2
+OS
0
1%
2
STEP SIZE – V
OVERSHOOT – %
50
5
VS = 5V
TA = 25ⴗC
MAXIMUM OUTPUT SWING – V p-p
VS = 5V
VCM = 2.5V
RL = 10k⍀
TA = 25ⴗC
VIN = ⴞ50mV
1k
100
FREQUENCY – Hz
10
10k
TPC 14. AD8519 Voltage Noise
Density
1k
100
FREQUENCY – Hz
10
10k
TPC 15. AD8519 Current Noise
Density
VS = ⴞ2.5V
AVCC = 1
TA = 25ⴗC
CL = 100pF
RL = 10k⍀
VS = ⴞ2.5V
VIN = 6V p-p
AV = 1
1V
20␮s
TPC 17. No Phase Reversal
–8–
20mV
500ns
TPC 18. Small Signal Transient
Response
REV. C
AD8519/AD8529
R4
10k⍀
VS = ⴞ2.5V
AVCC = 1
TA = +25ⴗC
CL = 100pF
R1
10k⍀
R2
10k⍀
NODE A
R3
4.99k⍀
R5
10k⍀
VIN
D1
1N914
D2
1N914
VOUT
U2
AD8519
U1
R6
5k⍀
500mV
50␮s
VIRTUAL GROUND =
TPC 19. Large Signal Transient Response
Precision Full-Wave Rectifier
2
R6 and R7 are both necessary to limit the amount of bias current
related voltage offset. Unfortunately, there is no “perfect” value
for R6 because the impedance at the inverting node is altered as
D1 and D2 switch. Therefore, there will also be some unresolved
bias current related offset. To minimize this offset, use lower
value resistors or choose a FET amplifier if the optimized offset
is still intolerable.
Slew rate is probably the most underestimated parameter
when designing a precision rectifier. Yet without a good slew
rate large glitches will be generated during the period when
both diodes are off.
Let’s examine the operation of the basic circuit (shown in
Figure 1) before considering slew rate further. U1 is set up to
have two states of operation. D1 and D2 diodes switch the
output between the two states. State one is an inverter with a
gain of +1, and state two is a simple unity gain buffer where the
output is equal to the value of the virtual ground. The virtual
ground is the potential present at the noninverting node of
the U1. State one is active when VIN is larger than the virtual
ground. D2 is on in this condition. If VIN drops below virtual
ground, D2 turns off and D1 turns on. This causes the output
of U1 to simply buffer the virtual ground and this configuration
is state two. So, the function of U1, which results from these
two states of operation, is a half wave inverter. The U2 function
takes the inverted half wave at a gain of two and sums it into the
original VIN wave, which outputs a rectified full wave.
The AD8519 offers a unique combination of speed versus power
ratio at 2.7 V single supply, small size (SC70 and SOT-23), and
low noise that make it an ideal choice for most high volume and
high precision rectifier circuits.
10ⴛ Microphone Preamp Meets PC99 Specifications
This circuit, while lacking a unique topology, is anything but
featureless when an AD8519 is used as the op amp. This preamp
gives 20 dB gain over a frequency range of 20 Hz to 20 kHz and
is fully PC99 compliant in all parameters including THD+N,
dynamic range, frequency range, amplitude range, crosstalk, and
so on. Not only does this preamp comply with the PC99 specifications, it far surpasses them. In fact, this preamp has a VOUT
noise of around 100 dB, which is suitable for most professional
20-bit audio systems. Referred to input noise is 120 dB. At 120 dB
THD+N in unity gain, the AD8519 is suitable for 24-bit professional audio systems. In other words, the AD8519 will not be
the limiting performance factor in audio systems despite its small
size and low cost.
<0
This type of rectifier can be very precise if the following electrical
parameters are adhered to:
1. All passive components should be of tight tolerance, 1% resistors
and 5% capacitors.
2. If the application circuit requires high impedance (i.e., direct
sensor interface), then a FET amplifier is probably a better
choice than the AD8519.
3. An amp such as the AD8519, which has a great slew rate
specification, will yield the best result because the circuit involves
switching.
REV. C
VCC
Switching glitches are caused when D1 and D2 are both momentarily off. This condition occurs every time the input signal is
equal to the virtual ground potential. When this condition occurs,
the U1 stage is taken out of the VOUT equation and VOUT is equal
to VIN ¥ R5 ¥ (R4 储 R1 + R2 + R3). Note that Node A should be
VIN inverted or virtual ground, but in this condition Node A is
simply tracking VIN. Given a sine wave input centered around
virtual ground, glitches are generated at the sharp negative peaks
of the rectified sine wave. If the glitches are hard to notice on an
oscilloscope, raise the frequency of the sine wave until they
become apparent. The size of the glitches is proportional to the
input frequency, the diode turn-on potential (0.2 V or 0.65 V),
and the slew rate of the op amp.
The maximum power that can be safely dissipated by the
AD8519/AD8529 is limited by the associated rise in junction
temperature. The maximum safe junction temperature is 150∞C
for these plastic packages. If this maximum is momentarily
exceeded, proper circuit operation will be restored as soon as
the die temperature is reduced. Operating the product in the
“overheated” condition for an extended period can result in
permanent damage to the device.
-1
R7
3.32k⍀
Figure 1. Precision Full-Wave Rectifier
APPLICATIONS INFORMATION
Maximum Power Dissipation
VOUT = VIN - 2 VIN
AD8519
–9–
AD8519/AD8529
Slew rate related distortion would not be present at the lower
voltages because the AD8519 is so fast at 2.1 V/ms. A general
rule of thumb for determining the necessary slew rate for an
audio system is to take the maximum output voltage range of
the device given the design’s power rails and divide by two.
In Figure 2, the power rails are 2.7 V and the output is rail-torail. Enter these numbers into the equation: 2.7/2 is 1.35 V and
the minimum ideal slew rate is 1.35 V/ms.
While this data sheet gives only one audio example, many audio
circuits are enhanced with the use of the AD8519. Following
are a few examples: active audio filters such as bass, treble, and
equalizers; PWM filters at the output of audio DACs; buffers and
summers for mixing stations; and gain stages for volume control.
240pF
2.7V
1k⍀
Figure 3 is a schematic of a two-element varying bridge. This configuration is commonly found in pressure and flow transducers.
With two-elements varying, the signal will be 2¥ as compared to
a single-element varying bridge. The advantages of this type of
bridge are gain setting range, no signal input equals 0 V out, and
single-supply application. Negative characteristics are nonlinear
operation and required R matching. Given these sets of conditions,
requirements, and characteristics, the AD8519 can be successfully used in this configuration because of its rail-to-rail output
and low offset. Perhaps the greatest benefits of the AD8519,
when used in the bridge configuration, are the advantages it can
bring when placed in a remote bridge sensor. For example, the
tiny SC70 and SOT-23 packages will reduce the overall sensor
size; low power allows for remote powering via batteries or solar
cells, high output current drive to drive a long cable, and 2.7 V
operation for two-cell operation.
30.9k⍀
2.7V
C1
1␮F
MIC
IN
2.7V
3.09k⍀
1nF
NPO
AD8519
46.4k⍀
RF
CODEC LINE IN
OR MIC IN
R
R
R
R
48k⍀
AD8519
93.1k⍀
2.7V
RF
10␮F ELECT
Figure 3. Two-Element Varying Bridge Amplifier
Figure 2. 10⫻ Microphone Preamplifier
Two-Element Varying Bridge Amplifier
There are a host of bridge configurations available to designers.
For a complete analysis, look at the ubiquitous bridge and its different forms. Please refer to the 1992 Amplifier Applications Guide*.
*Adolfo Garcia and James Wong, Chapter 2, 1992 Amplifier Applications Guide.
–10–
REV. C
AD8519/AD8529
* AD8519/AD8529 SPICE Macro-model
* 10/98, Ver. 1
* TAM / ADSC
*
* Copyright 1998 by Analog Devices
*
* Refer to “README.DOC” file for License State* ment. Use of this model
* indicates your acceptance of the terms and
* provisions in the License
* Statement.
*
* Node Assignments
*
noninverting input
*
|
inverting input
*
|
|
positive supply
*
|
|
|
negative supply
*
|
|
|
|
output
*
|
|
|
|
|
*
|
|
|
|
|
.SUBCKT AD8519
1
2
99 50 45
*
*INPUT STAGE
*
Q1 5 7 15 PIX
Q2 6 2 15 PIX
IOS 1 2 1.25E-9
I1 99 15 200E-6
EOS 7 1 POLY(2) (14,98) (73,98) 1E-3 1 1
RC1 5 50 2E3
RC2 6 50 2E3
C1 5 6 1.3E-12
D1 15 8 DX
V1 99 8 DC 0.9
*
* INTERNAL VOLTAGE REFERENCE
*
EREF 98 0 POLY(2) (99,0) (50,0) 0 .5 .5
ISY 99 50 300E-6
*
* CMRR=100dB, ZERO AT 1kHz
*
ECM 13 98 POLY(2) (1,98) (2,98) 0 0.5 0.5
RCM1 13 14 1E6
RCM2 14 98 10
CCM1 13 14 240E-12
*
REV. C
* PSRR=100dB, ZERO AT 200Hz
*
RPS1 70 0 1E6
RPS2 71 0 1E6
CPS1 99 70 1E-5
CPS2 50 71 1E-5
EPSY 98 72 POLY(2) (70,0) (0,71) 0 1 1
RPS3 72 73 1.59E6
CPS3 72 73 500E-12
RPS4 73 98 15.9
*
* POLE AT 20MHz, ZERO AT 60MHz
*
G1 21 98 (5,6) 5.88E-6
R1 21 98 170E3
R2 21 22 85E3
C2 22 98 40E-15
*
* GAIN STAGE
*
G2 25 98 (21,98) 37.5E-6
R5 25 98 1E7
CF 45 25 5E-12
D3 25 99 DX
D4 50 25 DX
*
* OUTPUT STAGE
*
Q3 45 41 99 POUT
Q4 45 43 50 NOUT
EB1 99 40 POLY(1) (98,25) 0.594 1
EB2 42 50 POLY(1) (25,98) 0.594 1
RB1 40 41 500
RB2 42 43 500
*
* MODELS
*
.MODEL PIX PNP (BF=500,IS=1E-14,KF=5E-6)
.MODEL POUT PNP (BF=100,IS=1E-14,BR=0.517)
.MODEL NOUT NPN (BF=100,IS=1E-14,BR=0.413)
.MODEL DX D(IS=1E-14,CJO=1E-15)
.ENDS AD8519
–11–
AD8519/AD8529
OUTLINE DIMENSIONS
8-Lead Standard Small Outline Package [SOIC]
Narrow Body
(R-8)
8-Lead Mini Small Outline Package [MSOP]
(RM-8)
Dimensions shown in millimeters
3.00
BSC
5.00 (0.1968)
4.80 (0.1890)
8
4.00 (0.1574)
3.80 (0.1497)
8
5
1
4
C01756–0–2/03(C)
Dimensions shown in millimeters and (inches)
5
4.90
BSC
3.00
BSC
6.20 (0.2440)
5.80 (0.2284)
1
4
PIN 1
1.27 (0.0500)
BSC
0.25 (0.0098)
0.10 (0.0040)
0.51 (0.0201)
0.33 (0.0130)
COPLANARITY
SEATING
0.10
PLANE
0.50 (0.0196)
ⴛ 45ⴗ
0.25 (0.0099)
1.75 (0.0688)
1.35 (0.0532)
0.65 BSC
1.10 MAX
0.15
0.00
8ⴗ
0.25 (0.0098) 0ⴗ 1.27 (0.0500)
0.41 (0.0160)
0.19 (0.0075)
0.38
0.22
COPLANARITY
0.10
COMPLIANT TO JEDEC STANDARDS MS-012AA
CONTROLLING DIMENSIONS ARE IN MILLIMETERS; INCH DIMENSIONS
(IN PARENTHESES) ARE ROUNDED-OFF MILLIMETER EQUIVALENTS FOR
REFERENCE ONLY AND ARE NOT APPROPRIATE FOR USE IN DESIGN
0.23
0.08
0.80
0.40
8ⴗ
0ⴗ
SEATING
PLANE
COMPLIANT TO JEDEC STANDARDS MO-187AA
5-Lead Plastic Surface Mount Package [SC70]
(KS-5)
5-Lead Plastic Surface Mount Package [SOT-23]
(RT-5)
Dimensions shown in millimeters
Dimensions shown in millimeters
2.90 BSC
2.00 BSC
4
5
1.25 BSC
5
2.10 BSC
1
2
4
2.80 BSC
1.60 BSC
3
1
2
3
PIN 1
0.65 BSC
0.10 MAX
PIN 1
1.10 MAX
0.95 BSC
0.22
0.08
0.30
0.15
0.10 COPLANARITY
SEATING
PLANE
1.30
1.15
0.90
0.46
0.36
0.26
1.90
BSC
1.45 MAX
COMPLIANT TO JEDEC STANDARDS MO-203AA
0.15 MAX
0.50
0.30
SEATING
PLANE
0.22
0.08
10ⴗ
0ⴗ
0.60
0.45
0.30
COMPLIANT TO JEDEC STANDARDS MO-178AA
Revision History
Location
Page
2/03—Data Sheet changed from REV. B to REV. C.
Changed mSOIC to MSOP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Universal
Changed SO-8 to R-8 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Universal
Changes to Precision Full-Wave Rectifier section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Changes to 10¥ Microphone Preamp Meets PC99 Specifications section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Updated OUTLINE DIMENSIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
–12–
REV. C
PRINTED IN U.S.A.
1.00
0.90
0.70