Ultralow Noise Amplifier at Lower Power
ADA4075-2
Data Sheet
PIN CONFIGURATIONS
Ultralow noise: 2.8 nV/√Hz at 1 kHz typical
Ultralow distortion: 0.0002% typical
Low supply current: 1.8 mA per amplifier typical
Offset voltage: 1 mV maximum
Bandwidth: 6.5 MHz typical
Slew rate: 12 V/μs typical
Dual-supply operation: ±4.5 V to ±18 V
Unity-gain stable
Extended industrial temperature range
8-lead SOIC and 2 mm × 2 mm LFCSP packages
OUTA 1
–INA 2
8
ADA4075-2
V+
OUTB
TOP VIEW
6 –INB
(Not to Scale)
5 +INB
V– 4
7
+INA 3
Figure 1. 8-Lead SOIC
–INA 2
ADA4075-2
7 OUTB
+INA 3
TOP VIEW
(Not to Scale)
6 –INB
V– 4
Precision instrumentation
Professional audio
Active filters
Low noise amplifier front end
Integrators
5 +INB
07642-002
8 V+
OUTA 1
APPLICATIONS
Figure 2. 8-Lead, 2 mm × 2 mm LFCSP
GENERAL DESCRIPTION
Table 1. Low Noise Precision Op Amps
The ADA4075-2 is a dual, high performance, low noise operational
amplifier combining excellent dc and ac characteristics on the
Analog Devices, Inc., iPolar® process. The iPolar process is an
advanced bipolar technology implementing vertical junction
isolation with lateral trench isolation. This allows for low noise
performance amplifiers in smaller die size at faster speed and
lower power. Its high slew rate, low distortion, and ultralow
noise make the ADA4075-2 ideal for high fidelity audio and
high performance instrumentation applications. It is also
especially useful for lower power demands, small enclosures,
and high density applications. The ADA4075-2 is specified for
the −40°C to +125°C temperature range and is available in a
standard SOIC package and a 2 mm × 2 mm LFCSP package.
Supply
Single
44 V
OP27
Dual
OP275
Rev. C
07642-001
FEATURES
Quad
36 V
AD8671
AD8675
AD8597
ADA4004-1
AD797
AD8672
AD8676
AD8599
ADA4004-2
AD8674
ADA4004-4
12 V to 16 V
AD8665
OP162
5V
AD8605
AD8655
AD8691
AD8666
OP262
AD8606
AD8656
AD8692
AD8668
OP462
AD8608
AD8694
Document Feedback
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.
Trademarks and registered trademarks are the property of their respective owners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700 ©2008–2013 Analog Devices, Inc. All rights reserved.
Technical Support
www.analog.com
ADA4075-2
Data Sheet
TABLE OF CONTENTS
Features .............................................................................................. 1
Applications Information .............................................................. 16
Applications ....................................................................................... 1
Input Protection ......................................................................... 16
Pin Configurations ........................................................................... 1
Total Harmonic Distortion ....................................................... 16
General Description ......................................................................... 1
Phase Reversal ............................................................................ 16
Revision History ............................................................................... 2
DAC Output Filter...................................................................... 17
Specifications..................................................................................... 3
Balanced Line Driver ................................................................. 18
Absolute Maximum Ratings ............................................................ 5
Balanced Line Receiver .............................................................. 19
Thermal Resistance ...................................................................... 5
Low Noise Parametric Equalizer .............................................. 20
Power Sequencing ........................................................................ 5
Schematic ......................................................................................... 21
ESD Caution .................................................................................. 5
Outline Dimensions ....................................................................... 22
Typical Performance Characteristics ............................................. 6
Ordering Guide .......................................................................... 22
REVISION HISTORY
11/13—Rev. B to Rev. C
Change to Balanced Line Receiver Section ................................. 19
12/11—Rev. A to Rev. B
Changes to Features Section............................................................ 1
8/09—Rev. 0 to Rev. A
Added 8-Lead LFCSP_WD ............................................... Universal
Changes to Table 1 ............................................................................ 1
Changes to Table 2 ............................................................................ 3
Changes to Table 3 ............................................................................ 4
Changes to Table 4 and Table 5 ....................................................... 5
Changes to Figure 3, Figure 5, Figure 6, and Figure 8 ................. 6
Added Figure 4 and Figure 7; Renumbered Sequentially ........... 6
Added Figure 9 and Figure 12......................................................... 7
Changes to Figure 10, Figure 11, Figure 13, and Figure 14 ......... 7
Changes to Figure 16, Figure 17, Figure 19, and Figure 20 ......... 8
Changes to Figure 22 and Figure 25............................................... 9
Changes to Figure 36 ...................................................................... 11
Changes to Figure 54 ...................................................................... 14
Changes to and Moved Figure 57 and Figure 60 to ................... 15
Changes to Figure 59 and Figure 62............................................. 15
Changes to Input Protection Section and Phase
Reversal Section .............................................................................. 16
Changes to DAC Output Filter Section ....................................... 17
Changes to Figure 67 ...................................................................... 18
Updated Outline Dimensions ....................................................... 22
Changes to Ordering Guide .......................................................... 22
10/08—Revision 0: Initial Version
Rev. C | Page 2 of 24
Data Sheet
ADA4075-2
SPECIFICATIONS
VSY = ±15 V, VCM = 0 V, TA = 25°C, SOIC package, unless otherwise noted.
Table 2.
Parameter
INPUT CHARACTERISTICS
Offset Voltage
Symbol
Conditions
Min
VOS
Typ
Max
Unit
0.2
1
1.2
100
150
50
75
+12.5
mV
mV
nA
nA
nA
nA
V
dB
dB
dB
dB
dB
dB
µV/°C
MΩ
MΩ
pF
pF
−40°C ≤ TA ≤ +125°C
Input Bias Current
IB
30
−40°C ≤ TA ≤ +125°C
Input Offset Current
IOS
Input Voltage Range
Common-Mode Rejection Ratio
CMRR
Large Signal Voltage Gain
AVO
Offset Voltage Drift
Input Resistance, Differential Mode
Input Resistance, Common Mode
Input Capacitance, Differential Mode
Input Capacitance, Common Mode
OUTPUT CHARACTERISTICS
Output Voltage High
Output Voltage Low
Short-Circuit Current
Closed-Loop Output Impedance
POWER SUPPLY
Power Supply Rejection Ratio
Supply Current per Amplifier
DYNAMIC PERFORMANCE
Slew Rate
Settling Time
Gain Bandwidth Product
Phase Margin
THD + NOISE
Total Harmonic Distortion and Noise
NOISE PERFORMANCE
Voltage Noise
Voltage Noise Density
Current Noise Density
∆VOS/∆T
RINDM
RINCM
CINDM
CINCM
VOH
VOL
ISC
ZOUT
PSRR
ISY
5
−40°C ≤ TA ≤ +125°C
−40°C ≤ TA ≤ +125°C
VCM = −12.5 V to +12.5 V
−40°C ≤ TA ≤ +125°C
RL = 2 kΩ, VO = −11 V to +11 V
−40°C ≤ TA ≤ +125°C
RL = 600 Ω, VO = −10 V to +10 V
−40°C ≤ TA ≤ +125°C
−40°C ≤ TA ≤ +125°C
RL = 2 kΩ to GND
−40°C ≤ TA ≤ +125°C
RL = 600 Ω to GND
−40°C ≤ TA ≤ +125°C
VSY = ±18 V, RL = 600 Ω to GND
−40°C ≤ TA ≤ +125°C
RL = 2 kΩ to GND
−40°C ≤ TA ≤ +125°C
RL = 600 Ω to GND
−40°C ≤ TA ≤ +125°C
VSY = ±18 V, RL = 600 Ω to GND
−40°C ≤ TA ≤ +125°C
−12.5
110
106
114
108
112
106
117
117
0.3
1.5
500
2.4
2.1
12.8
12.5
12.4
12
15
14
13
12.8
15.8
−14
−13.6
−16.6
−13.6
−13
−13
−12.5
−16
−15
40
0.1
f = 1 kHz, AV = 1
VSY = ±4.5 V to ±18 V
−40°C ≤ TA ≤ +125°C
VSY = ±4.5 V to ±18 V, IO = 0 mA
−40°C ≤ TA ≤ +125°C
118
106
100
110
1.8
2.25
3.35
V
V
V
V
V
V
V
V
V
V
V
V
mA
Ω
dB
dB
mA
mA
SR
tS
GBP
ΦM
RL = 2 kΩ, AV = 1
To 0.01%, VIN = 10 V step, RL = 1 kΩ
RL = 1 MΩ, CL = 35 pF, AV = 1
RL = 1 MΩ, CL = 35 pF, AV = 1
12
3
6.5
60
V/µs
µs
MHz
Degrees
THD + N
RL = 2 kΩ, AV = 1, VIN = 3 V rms, f = 1 kHz
0.0002
%
en p-p
en
in
f = 0.1 Hz to 10 Hz
f = 1 kHz
f = 1 kHz
60
2.8
1.2
nV p-p
nV/√Hz
pA/√Hz
Rev. C | Page 3 of 24
ADA4075-2
Data Sheet
VSY = ±15 V, VCM = 0 V, TA = 25°C, LFCSP package, unless otherwise noted.
Table 3.
Parameter
INPUT CHARACTERISTICS
Offset Voltage
Symbol
Conditions
Min
VOS
Typ
Max
Unit
0.3
1
1.5
100
150
50
75
+12.5
mV
mV
nA
nA
nA
nA
V
dB
dB
dB
dB
dB
dB
µV/°C
MΩ
MΩ
pF
pF
−40°C ≤ TA ≤ +125°C
Input Bias Current
IB
30
−40°C ≤ TA ≤ +125°C
Input Offset Current
IOS
Input Voltage Range
Common-Mode Rejection Ratio
CMRR
Large Signal Voltage Gain
AVO
Offset Voltage Drift
Input Resistance, Differential Mode
Input Resistance, Common Mode
Input Capacitance, Differential Mode
Input Capacitance, Common Mode
OUTPUT CHARACTERISTICS
Output Voltage High
Output Voltage Low
Short-Circuit Current
Closed-Loop Output Impedance
POWER SUPPLY
Power Supply Rejection Ratio
Supply Current per Amplifier
DYNAMIC PERFORMANCE
Slew Rate
Settling Time
Gain Bandwidth Product
Phase Margin
THD + NOISE
Total Harmonic Distortion and Noise
NOISE PERFORMANCE
Voltage Noise
Voltage Noise Density
Current Noise Density
∆VOS/∆T
RINDM
RINCM
CINDM
CINCM
VOH
VOL
ISC
ZOUT
PSRR
ISY
5
−40°C ≤ TA ≤ +125°C
−40°C ≤ TA ≤ +125°C
VCM = −12.5 V to +12.5 V
−40°C ≤ TA ≤ +125°C
RL = 2 kΩ, VO = −11 V to +11 V
−40°C ≤ TA ≤ +125°C
RL = 600 Ω, VO = −10 V to +10 V
−40°C ≤ TA ≤ +125°C
−40°C ≤ TA ≤ +125°C
RL = 2 kΩ to GND
−40°C ≤ TA ≤ +125°C
RL = 600 Ω to GND
−40°C ≤ TA ≤ +125°C
VSY = ±18 V, RL = 600 Ω to GND
−40°C ≤ TA ≤ +125°C
RL = 2 kΩ to GND
−40°C ≤ TA ≤ +125°C
RL = 600 Ω to GND
−40°C ≤ TA ≤ +125°C
VSY = ±18 V, RL = 600 Ω to GND
−40°C ≤ TA ≤ +125°C
−12.5
110
106
110
102
108
100
117
117
3
1.5
500
2.4
2.1
12.8
12.5
12.4
12
15
14
13
12.8
15.8
−14
−13.6
−16.6
−13.6
−13
−13
−12.5
−16
−15
40
0.1
f = 1 kHz, AV = 1
VSY = ±4.5 V to ±18 V
−40°C ≤ TA ≤ +125°C
VSY = ±4.5 V to ±18 V, IO = 0 mA
−40°C ≤ TA ≤ +125°C
116
100
95
104
1.8
2.25
3.35
V
V
V
V
V
V
V
V
V
V
V
V
mA
Ω
dB
dB
mA
mA
SR
tS
GBP
ΦM
RL = 2 kΩ, AV = 1
To 0.01%, VIN = 10 V step, RL = 1 kΩ
RL = 1 MΩ, CL = 35 pF, AV = 1
RL = 1 MΩ, CL = 35 pF, AV = 1
12
3
6.5
60
V/µs
µs
MHz
Degrees
THD + N
RL = 2 kΩ, AV = 1, VIN = 3 V rms, f = 1 kHz
0.0002
%
en p-p
en
in
f = 0.1 Hz to 10 Hz
f = 1 kHz
f = 1 kHz
60
2.8
1.2
nV p-p
nV/√Hz
pA/√Hz
Rev. C | Page 4 of 24
Data Sheet
ADA4075-2
ABSOLUTE MAXIMUM RATINGS
THERMAL RESISTANCE
Table 4.
Parameter
Supply Voltage
Input Voltage
Input Current1
Differential Input Voltage
Output Short-Circuit Duration to GND
Storage Temperature Range
Operating Temperature Range
Junction Temperature Range
Lead Temperature (Soldering, 60 sec)
1
θJA is specified for the worst-case conditions, that is, a device
soldered in a circuit board for surface-mount packages. This
was measured using a standard 4-layer board.
Rating
±20 V
±VSY
±10 mA
±1.2 V
Indefinite
−65°C to +150°C
−40°C to +125°C
−65°C to +150°C
300°C
Table 5. Thermal Resistance
Package Type
8-Lead SOIC
8-Lead LFCSP
θJA
158
115
θJC
43
40
Unit
°C/W
°C/W
POWER SEQUENCING
The input pins have clamp diodes to the power supply pins.
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 indicated in the operational
section of this specification is not implied. Exposure to absolute
maximum rating conditions for extended periods may affect
device reliability.
The op amp supplies must be established simultaneously with,
or before, any input signals are applied. If this is not possible,
limit the input current to 10 mA.
ESD CAUTION
Rev. C | Page 5 of 24
ADA4075-2
Data Sheet
TYPICAL PERFORMANCE CHARACTERISTICS
TA = 25°C, unless otherwise noted.
250
250
200
NUMBER OF AMPLIFIERS
150
100
VSY = ±5V
VCM = 0V
BASED ON 600 OP AMPS
SOIC PACKAGE
150
100
–0.5
0
0.5
1.0
VOS (mV)
0
–1.0
07642-003
0
–1.0
1.0
100
VSY = ±15V
VCM = 0V
BASED ON 300 OP AMPS
LFCSP PACKAGE
80
NUMBER OF AMPLIFIERS
60
40
VSY = ±5V
VCM = 0V
BASED ON 300 OP AMPS
LFCSP PACKAGE
60
40
20
20
–0.5
0
0.5
1.0
VOS (mV)
0
–1.0
07642-040
0
–1.0
0
0.5
1.0
VOS (mV)
Figure 4. Input Offset Voltage Distribution
Figure 7. Input Offset Voltage Distribution
80
70
VSY = ±15V
–40°C ≤ TA ≤ +125°C
BASED ON 200 OP AMPS
SOIC PACKAGE
VSY = ±5V
–40°C ≤ TA ≤ +125°C
BASED ON 200 OP AMPS
SOIC PACKAGE
70
NUMBER OF AMPLIFIERS
60
50
40
30
20
10
60
50
40
30
20
10
–1.6
–1.2
–0.8
–0.4
0
0.4
0.8
1.2
1.6
TCVOS (μV/°C)
2.0
0
–2.0
07642-004
0
–2.0
–0.5
07642-042
NUMBER OF AMPLIFIERS
0.5
Figure 6. Input Offset Voltage Distribution
100
NUMBER OF AMPLIFIERS
0
VOS (mV)
Figure 3. Input Offset Voltage Distribution
80
–0.5
07642-006
50
50
–1.6
–1.2
–0.8
–0.4
0
0.4
0.8
1.2
1.6
TCVOS (μV/°C)
Figure 8. Input Offset Voltage Drift Distribution
Figure 5. Input Offset Voltage Drift Distribution
Rev. C | Page 6 of 24
2.0
07642-007
NUMBER OF AMPLIFIERS
200
VSY = ±15V
VCM = 0V
BASED ON 600 OP AMPS
SOIC PACKAGE
Data Sheet
ADA4075-2
40
40
VSY = ±15V
VCM = 0V
BASED ON 300 OP AMPS
LFCSP PACKAGE
VSY = ±5V
VCM = 0V
BASED ON 300 OP AMPS
LFCSP PACKAGE
35
30
NUMBER OF AMPLIFIERS
25
20
15
10
5
30
25
20
15
10
1
2
3
4
5
TCVOS (µV/°C)
6
8
7
0
0
Figure 9. Input Offset Voltage Drift Distribution
100
VOS (μV)
100
0
–100
–200
–200
0
5
6
7
8
0
–100
–5
4
5
TCVOS (µV/°C)
VSY = ±5V
BASED ON 60 OP AMPS
200
–10
3
300
VSY = ±15V
BASED ON 60 OP AMPS
200
–300
–15
2
Figure 12. Input Offset Voltage Drift Distribution
10
15
VCM (V)
–300
–5
07642-005
VOS (μV)
300
1
–4
–3
–2
–1
0
1
2
3
5
07642-008
0
07642-043
0
07642-052
5
125
07642-012
NUMBER OF AMPLIFIERS
35
4
VCM (V)
Figure 10. Input Offset Voltage vs. Common-Mode Voltage
Figure 13. Input Offset Voltage vs. Common-Mode Voltage
80
100
VSY = ±15V
VSY = ±5V
80
60
IB (nA)
40
20
20
0
–50
–25
0
25
50
75
100
TEMPERATURE (°C)
125
0
–50
07642-009
IB (nA)
60
40
–25
0
25
50
75
100
TEMPERATURE (°C)
Figure 11. Input Bias Current vs. Temperature
Figure 14. Input Bias Current vs. Temperature
Rev. C | Page 7 of 24
ADA4075-2
Data Sheet
60
60
VSY = ±5V
50
40
40
30
20
20
10
10
–5
0
5
10
15
VCM (V)
0
–4
OUTPUT VOLTAGE TO SUPPLY RAIL (V)
V+ – VOH
1
VOL – V–
0.1
1
10
100
LOAD CURRENT (mA)
OUTPUT VOLTAGE TO SUPPLY RAIL (V)
1.5
VOL – V–
–25
0
25
50
75
100
TEMPERATURE (°C)
125
4
1
VOL – V–
0.01
0.1
1
10
100
VSY = ±5V
RL = 2kΩ
V+ – VOH
1.5
1.0
VOL – V–
0.5
0
–50
07642-011
0.5
0
–50
3
V+ – VOH
2.0
V+ – VOH
1.0
2
Figure 19. Output Voltage to Supply Rail vs. Load Current
VSY = ±15V
RL = 2kΩ
2.0
1
LOAD CURRENT (mA)
Figure 16. Output Voltage to Supply Rail vs. Load Current
2.5
0
VSY = ±5V
0.1
0.001
07642-010
OUTPUT VOLTAGE TO SUPPLY RAIL (V)
10
0.01
–1
Figure 18. Input Bias Current vs. Input Common-Mode Voltage
VSY = ±15V
0.1
0.001
–2
VCM (V)
Figure 15. Input Bias Current vs. Input Common-Mode Voltage
10
–3
07642-013
–10
–25
0
25
50
75
100
TEMPERATURE (°C)
Figure 20. Output Voltage to Supply Rail vs. Temperature
Figure 17. Output Voltage to Supply Rail vs. Temperature
Rev. C | Page 8 of 24
125
07642-014
0
–15
OUTPUT VOLTAGE TO SUPPLY RAIL (V)
30
07642-049
IB (nA)
50
07642-047
IB (nA)
VSY = ±15V
Data Sheet
ADA4075-2
120
100
100
80
80
60
60
60
40
40
PHASE
20
20
GAIN
0
0
120
100
PHASE
80
60
GAIN
40
40
20
20
0
0
–20
–20
–40
–40
–40
–40
–60
–60
–60
–60
–80
–80
–80
–80
10k
100k
1M
–100
100M
10M
FREQUENCY (Hz)
–20
–100
1k
07642-015
10k
100k
1M
FREQUENCY (Hz)
Figure 21. Open-Loop Gain and Phase vs. Frequency
Figure 24. Open-Loop Gain and Phase vs. Frequency
50
50
VSY = ±5V
VSY = ±15V
40
AV = +100
40
AV = +10
GAIN (dB)
GAIN (dB)
AV = +10
20
10
20
10
AV = +1
0
–10
100
100k
10k
1k
1M
10M
100M
FREQUENCY (Hz)
–20
10
1k
100k
10k
1M
10M
100M
Figure 25. Closed-Loop Gain vs. Frequency
1k
1k
VSY = ±15V
VSY = ±5V
AV = +10
100
10
10
ZOUT (Ω)
AV = +100
AV = +1
1
AV = +1
0.1
0.01
0.01
1k
10k
100k
1M
FREQUENCY (Hz)
10M
AV = +100
1
0.1
100
AV = +10
100
0.001
10
07642-017
ZOUT (Ω)
100
FREQUENCY (Hz)
Figure 22. Closed-Loop Gain vs. Frequency
0.001
10
AV = +1
–10
07642-117
–20
10
AV = +100
30
30
0
–100
100M
10M
07642-120
–100
1k
–20
100
1k
10k
100k
1M
FREQUENCY (Hz)
Figure 26. Output Impedance vs. Frequency
Figure 23. Output Impedance vs. Frequency
Rev. C | Page 9 of 24
10M
07642-020
GAIN (dB)
80
GAIN (dB)
100
140
VSY = ±5V
PHASE (Degrees)
140
120
PHASE (Degrees)
140
VSY = ±15V
120
07642-018
140
ADA4075-2
Data Sheet
140
120
100
100
CMRR (dB)
120
80
60
80
60
40
40
20
20
0
100
1k
10k
100k
1M
10M
FREQUENCY (Hz)
VSY = ±5V
0
100
1k
100k
10k
Figure 30. CMRR vs. Frequency
Figure 27. CMRR vs. Frequency
120
120
VSY = ±5V
100
80
80
60
PSRR–
PSRR+
40
60
20
20
0
0
–20
10
100
1k
10k
100k
1M
10M
100M
FREQUENCY (Hz)
PSRR–
PSRR+
40
–20
10
100
1k
10k
100k
1M
10M
100M
FREQUENCY (Hz)
07642-025
PSRR (dB)
100
07642-022
Figure 31. PSRR vs. Frequency
Figure 28. PSRR vs. Frequency
40
40
VSY = ±15V
AV = +1
RL = 2kΩ
35
VSY = ±5V
AV = +1
RL = 2kΩ
35
30
OVERSHOOT (%)
30
25
20
15
25
20
15
10
5
5
0
10
100
1000
CAPACITANCE (pF)
07642-023
10
0
10
100
1000
CAPACITANCE (pF)
Figure 32. Small Signal Overshoot vs. Load Capacitance
Figure 29. Small Signal Overshoot vs. Load Capacitance
Rev. C | Page 10 of 24
07642-026
PSRR (dB)
VSY = ±15V
OVERSHOOT (%)
10M
1M
FREQUENCY (Hz)
07642-024
VSY = ±15V
07642-021
CMRR (dB)
140
Data Sheet
ADA4075-2
VSY = ±5V
VIN = 7V p-p
AV = +1
RL = 2kΩ
CL = 100pF
VOLTAGE (2V/DIV)
TIME (4µs/DIV)
Figure 33. Large Signal Transient Response
Figure 36. Large Signal Transient Response
VOLTAGE (20mV/DIV)
VSY = ±15V
VIN = 100mV p-p
AV = +1
RL = 2kΩ
CL = 100pF
VSY = ±5V
VIN = 100mV p-p
AV = +1
RL = 2kΩ
CL = 100pF
07642-028
0V
TIME (10µs/DIV)
0V
TIME (10µs/DIV)
Figure 34. Small Signal Transient Response
Figure 37. Small Signal Transient Response
4
4
VSY = ±15V
VSY = ±5V
2
2
INPUT
INPUT
0
–5
0
–2
–4
–15
–6
07642-029
–10
–20
TIME (1µs/DIV)
OUTPUT
Figure 35. Negative Overload Recovery
–8
TIME (1µs/DIV)
Figure 38. Negative Overload Recovery
Rev. C | Page 11 of 24
07642-032
0
INPUT VOLTAGE (V)
OUTPUT
OUTPUT VOLTAGE (V)
0
OUTPUT VOLTAGE (V)
INPUT VOLTAGE (V)
07642-030
TIME (4µs/DIV)
VOLTAGE (20mV/DIV)
0V
07642-027
0V
07642-031
VOLTAGE (5V/DIV)
VSY = ±15V
VIN = 20V p-p
AV = +1
RL = 2kΩ
CL = 100pF
ADA4075-2
Data Sheet
4
4
VSY = ±5V
VSY = ±15V
2
2
INPUT
INPUT
10
5
4
2
OUTPUT
0
0
–5
–2
07642-033
OUTPUT
–2
–10
TIME (1µs/DIV)
–4
TIME (1µs/DIV)
Figure 42. Positive Overload Recovery
Figure 39. Positive Overload Recovery
VSY = ±5V
VSY = ±15V
INPUT
07642-034
15
INPUT VOLTAGE (V)
OUTPUT VOLTAGE (V)
INPUT VOLTAGE (V)
–2
OUTPUT VOLTAGE (V)
0
0
VOLTAGE (5V/DIV)
VOLTAGE (5V/DIV)
INPUT
+10mV
OUTPUT
+6mV
OUTPUT
0V
0V
ERROR BAND
ERROR BAND
–10mV
TIME (2µs/DIV)
07642-062
07642-061
–6mV
TIME (2µs/DIV)
Figure 43. Positive Settling Time to 0.01%
Figure 40. Positive Settling Time to 0.01%
VSY = ±5V
VSY = ±15V
VOLTAGE (5V/DIV)
VOLTAGE (5V/DIV)
INPUT
INPUT
+10mV
OUTPUT
+6mV
ERROR BAND
OUTPUT
0V
0V
ERROR BAND
–10mV
TIME (2µs/DIV)
Figure 44. Negative Settling Time to 0.01%
Figure 41. Negative Settling Time to 0.01%
Rev. C | Page 12 of 24
07642-063
07642-064
TIME (2µs/DIV)
–6mV
Data Sheet
ADA4075-2
10
10
VSY = ±5V
100
1k
10k
100k
FREQUENCY (Hz)
1
1
10
CURRENT NOISE DENSITY (pA/ Hz)
CURRENT NOISE DENSITY (pA/ Hz)
10
RS2
UNCORRELATED
RS1 = 0Ω
1
0.1
10
100
1k
10k
100k
FREQUENCY (Hz)
07642-045
CORRELATED
RS1 = RS2
1
10k
100k
100k
Figure 48. Voltage Noise Density
RS1
VSY = ±15V
1k
FREQUENCY (Hz)
Figure 45. Voltage Noise Density
10
100
07642-038
10
VSY = ±5V
RS1
RS2
UNCORRELATED
RS1 = 0Ω
1
CORRELATED
RS1 = RS2
0.1
1
10
100
1k
10k
FREQUENCY (Hz)
Figure 49. Current Noise Density
Figure 46. Current Noise Density
VSY = ±5V
TIME (1s/DIV)
07642-036
INPUT NOISE VOLTAGE (10nV/DIV)
INPUT NOISE VOLTAGE (10nV/DIV)
VSY = ±15V
TIME (1s/DIV)
Figure 47. 0.1 Hz to 10 Hz Noise
Figure 50. 0.1 Hz to 10 Hz Noise
Rev. C | Page 13 of 24
07642-039
1
07642-046
1
07642-035
VOLTAGE NOISE DENSITY (nV/√Hz)
VOLTAGE NOISE DENSITY (nV/√Hz)
VSY = ±15V
ADA4075-2
Data Sheet
6
8
SUPPLY CURRENT (mA)
SUPPLY CURRENT (mA)
5
6
+125°C
+85°C
4
+25°C
–40°C
2
VSY = ±15V
4
VSY = ±5V
3
2
4
8
6
12
10
14
16
18
SUPPLY VOLTAGE (±V)
0
–50
07642-048
0
25
50
75
100
125
Figure 54. Supply Current vs. Temperature
10
VSY = ±15V
f = 1kHz
1
1
0.1
0.1
THD + NOISE (%)
THD + NOISE (%)
0
TEMPERATURE (°C)
Figure 51. Supply Current vs. Supply Voltage
10
–25
07642-057
1
0.01
0.001
VSY = ±5V
f = 1kHz
0.01
600Ω
0.001
600Ω
0.001
0.01
0.1
1
2kΩ
10
AMPLITUDE (V rms)
07642-058
0.00001
0.0001
0.0001
2kΩ
0.00001
0.0001
0.1
1
10
Figure 55. THD + Noise vs. Amplitude
1
VSY = ±15V
VIN = 3V rms
0.1
VSY = ±5V
VIN = 1.5V rms
THD + NOISE (%)
0.1
0.01
600Ω
0.001
0.01
600Ω
0.001
2kΩ
0.0001
10
100
1k
10k
FREQUENCY (Hz)
100k
Figure 53. THD + Noise vs. Frequency
0.0001
10
100
1k
10k
FREQUENCY (Hz)
Figure 56. THD + Noise vs. Frequency
Rev. C | Page 14 of 24
100k
07642-067
2kΩ
07642-060
THD + NOISE (%)
0.01
AMPLITUDE (V rms)
Figure 52. THD + Noise vs. Amplitude
1
0.001
07642-065
0.0001
Data Sheet
ADA4075-2
0
0
1kΩ
–40
RL
–60
–80
–100
–40
RL
–60
–80
–100
1k
10k
100k
FREQUENCY (Hz)
–140
100
07642-041
–140
100
10k
100k
FREQUENCY (Hz)
Figure 57. Channel Separation vs. Frequency
10
1k
07642-044
–120
–120
Figure 60. Channel Separation vs. Frequency
1
VSY = ±18V
f = 1kHz
1
VSY = ±18V
VIN = 8V rms
0.1
THD + NOISE (%)
0.1
THD + NOISE (%)
VSY = ±5V
VIN = 5V p-p
RL = 2kΩ
1kΩ
–20
CHANNEL SEPARATION (dB)
CHANNEL SEPARATION (dB)
–20
100kΩ
VSY = ±15V
VIN = 10V p-p
RL = 2kΩ
100kΩ
0.01
0.001
0.01
0.001
600Ω
600Ω
2kΩ
0.0001
0.0001
0.01
10
1
0.1
100
AMPLITUDE (V rms)
0.00001
10
10
OUTPUT VOLTAGE TO SUPPLY RAIL (V)
V+ – VOH
1.5
VOL – V–
0.5
–25
0
25
50
75
100
TEMPERATURE (°C)
125
07642-066
OUTPUT VOLTAGE TO SUPPLY RAIL (V)
VSY = ±18V
RL = 2kΩ
0
–50
10k
100k
Figure 61. THD + Noise vs. Frequency
2.5
1.0
1k
FREQUENCY (Hz)
Figure 58. THD + Noise vs. Amplitude
2.0
100
07642-059
0.001
Figure 59. Output Voltage to Supply Rail vs. Temperature
VSY = ±18V
V+ – VOH
1
VOL – V–
0.1
0.001
0.01
0.1
1
10
LOAD CURRENT (mA)
Figure 62. Output Voltage to Supply Rail vs. Load Current
Rev. C | Page 15 of 24
100
07642-068
0.00001
0.0001
07642-056
2kΩ
ADA4075-2
Data Sheet
APPLICATIONS INFORMATION
1
INPUT PROTECTION
ADA4075-2
R1 2
1
07642-050
R2 3
Figure 63. Input Protection
TOTAL HARMONIC DISTORTION
VSY = ±4V
RL = 2kΩ
VIN = 1.5V rms
0.01
0.0001
10
100
1k
10k
100k
FREQUENCY (Hz)
07642-069
VSY = ±15V
RL = 2kΩ
VIN = 3V rms
0.001
Figure 64. THD + Noise vs. Frequency
PHASE REVERSAL
An undesired phenomenon, phase reversal (also known as phase
inversion) occurs in many op amps when one or both of the
inputs are driven beyond the specified input common-mode
voltage (VICM) range, in effect reversing the polarity of the output.
In some cases, phase reversal can induce lockups and cause
equipment damage as well as self destruction.
The ADA4075-2 incorporates phase reversal prevention circuitry
that clamps the output to 2 V typical from the supply rails when
one or both inputs exceed the VICM range. Figure 65 shows the
input/output waveforms of the ADA4075-2 configured as a unitygain buffer for a supply voltage of ±15 V.
VIN
VSY = ±15V
VOUT
07642-053
The total harmonic distortion + noise (THD + N) of the
ADA4075-2 is 0.0002% typical with a load resistance of 2 kΩ.
Figure 64 shows the performance of the ADA4075-2 driving a
2 kΩ load with supply voltages of ±4 V and ±15 V. Notice that
there is more distortion for the supply voltage of ±4 V than for a
supply voltage of ±15 V. Therefore, it is important to operate the
ADA4075-2 at a supply voltage greater than ±5 V for optimum
distortion. The THD + noise graphs for supply voltages of ±5 V
and ±18 V are available in Figure 56 and Figure 61.
THD + NOISE (%)
In small signal applications, current limiting is not required;
however, in applications where the differential voltage of the
ADA4075-2 exceeds ±1.2 V, large currents may flow through
these diodes. Employ external current-limiting resistors as
shown in Figure 63 to reduce the input currents to less than
±10 mA. Note that depending on the value of these resistors,
the total voltage noise will most likely be degraded. For example,
a 1 kΩ resistor at room temperature has a thermal noise of
4 nV/√Hz, whereas the ADA4075-2 has an ultralow voltage
noise of only 2.8 nV/√Hz typical.
0.1
VOLTAGE (5V/DIV)
To prevent base-emitter junction breakdown from occurring in
the input stage of the ADA4075-2 when a very large differential
voltage is applied, the inputs are clamped by the internal diodes
to ±1.2 V. To preserve the ultralow voltage noise feature of the
ADA4075-2, the commonly used internal current-limiting
resistors in series with the inputs are not used.
TIME (40µs/DIV)
Figure 65. No Phase Reversal
Rev. C | Page 16 of 24
Data Sheet
ADA4075-2
DAC OUTPUT FILTER
For a DAC output filter, an op amp with reasonable slew rate and
bandwidth is required. The ADA4075-2 has a high slew rate of the
12 V/µs and a relatively wide bandwidth of 6.5 MHz. The cutoff
frequency of the low-pass filter is approximately 167 kHz. In
addition, the 100 kΩ − 47 µF RC network provides ac coupling
to block out the dc components at the output.
The ultralow voltage noise, low distortion, and high slew rate of
the ADA4075-2 make it an ideal choice for professional audio
signal processing. Figure 66 shows the ADA4075-2 used in a
typical audio DAC output filter configuration. The differential
outputs of the DAC are fed into the ADA4075-2. The ADA4075-2
is configured as a differential Sallen-Key filter. It operates as an
external low-pass filter to remove high frequency noise present
on the output pins of the DAC. It also provides differential-tosingle-ended conversion from the differential outputs of the DAC.
11kΩ
68pF
100Ω
1/2
1.5kΩ
5.62kΩ
DAC OUTP
ADA4075-2
560pF
5.62kΩ
270pF
47µF
2.2nF
150pF
Figure 66. Typical DAC Output Filter Circuit (Differential)
Rev. C | Page 17 of 24
OUTPUT
100kΩ
07642-054
DAC OUTN
+
3.01kΩ
11kΩ
ADA4075-2
Data Sheet
BALANCED LINE DRIVER
Finally, even with these precautions, it is vital that the positive
feedback be accurately controlled. This is partly achieved by
using 1% resistors. In addition, the following setup procedure
ensures that the positive feedback does not become excessive:
The circuit of Figure 67 shows a balanced line driver designed
for audio use. Such drivers are intended to mimic an output
transformer in operation, whereby the common-mode voltage
can be impressed by the load. Furthermore, either output can be
shorted to ground in single-ended applications without affecting
the overall operation.
1.
Set R11 to its midposition (or short the ends together,
whichever is easier) and temporarily short the negative
output to ground.
Apply a 10 V p-p sine wave at approximately 1 kHz to the
input and adjust R7 to provide 930 mV p-p at TEST (see
Figure 67).
Remove the short from the negative output (and across
R11, if used) and adjust R11 until the output waveforms
are symmetric.
2.
Circuits of this type use positive and negative feedback to obtain a
high common-mode output impedance, and they are somewhat
notorious for component sensitivity and susceptibility to latch-up.
This circuit uses several techniques to avoid spurious behavior.
3.
First, the 4-op-amp arrangement ensures that the input impedance
is load independent (the input impedance can become negative
with some configurations). Note that the output op amps are
packaged with the input op amps to maximize drive capability.
The overall gain of the driver is equal to 2, which provides an
extra 6 dB of headroom in balanced differential mode. The
output noise is about −109 dBV in a 20 kHz bandwidth.
Second, the positive feedback is ac-coupled by C2 and C3, which
eliminates the need for offset trim. Because the circuit is ac-coupled
at the input, these capacitors do not have significant dc voltage
across them, thus tantalum types of capacitors can be used.
C5
IN
50pF
C1
10µF
A1
R4
R5
4.7kΩ
4.7kΩ
A2
1/2
R1
10kΩ
R13
1/2
ADA4075-2
R18
4.7kΩ
R6
R2
4.7kΩ
C4
50pF
R3
4.7kΩ
A3
R7
250Ω
R8
4.7kΩ FEEDBACK
TRIM
R10
4.7kΩ
1/2
ADA4075-2
OUT+
100Ω
ADA4075-2
SYMMETRY
TRIM
R12
R11
250Ω
TEST
C2
10µF
C3
10µF
4.7kΩ
C6
50pF
A4
R15
R9
100Ω 4.7kΩ
1/2
R14
100Ω
OUT–
4.7kΩ
R16
R17
100Ω
4.7kΩ
NOTES
1. ALL RESISTORS SHOULD HAVE 1% TOLERANCE.
2. A1/A2 IN SAME PACKAGE; A3/A4 IN SAME PACKAGE.
Figure 67. Balanced Line Driver
Rev. C | Page 18 of 24
07642-073
ADA4075-2
Data Sheet
ADA4075-2
BALANCED LINE RECEIVER
Note that A3 is not in the signal path, and almost any op amp
works well here. Although it may seem as though the inverting
output should be noisier than the noninverting one, they are in
fact symmetric at about −111 dBV (20 kHz bandwidth).
Figure 68 depicts a unity-gain balanced line receiver capable of
a high degree of hum rejection. The CMRR is approximately
given by
20 log 10
Sometimes an overall gain of ½ is desired to provide an extra
6 dB of differential input headroom. This can be attained by
reducing R3 and R4 to 5 kΩ and increasing R9 to 22 kΩ.
R1R4 + 2R3 R4 + R2 R3
2(R1R4 − R2 R3 )
Therefore, R1 to R4 should be close tolerance components to
obtain the best possible CMRR without adjustment. The presence
of A2 ensures that the impedances are symmetric at the two inputs
(unlike many other designs), and, as a bonus, A2 also provides
a complementary output. A3 raises the common-mode input
impedance from approximately 7.5 kΩ to approximately 70 kΩ,
reducing the degradation of CMRR due to mismatches in source
impedance.
C2
50pF
R3
OUT+
C3
10kΩ
50pF
R6
R1
IN–
IN+
R7
5.6kΩ
R2
5kΩ
5kΩ
A1
R5
5kΩ
1/2
A2
5kΩ
ADA4075-2
1/2
OUT–
ADA4075-2
R8
5.6kΩ
R4
10kΩ
A3*
R9
R10
11kΩ
11kΩ
*A3 REDUCES THE DEGRADATION OF CMRR
(SEE THE BALANCED LINE RECEIVER SECTION FOR MORE DETAILS).
Figure 68. Balanced Line Receiver
Rev. C | Page 19 of 24
07642-071
C1
22µF
(NON-POLAR)
ADA4075-2
Data Sheet
LOW NOISE PARAMETRIC EQUALIZER
The bandwidth control adjusts the Q from 0.9 to about 11. The
overall noise is setting dependent, but with all controls centered,
it is about −104 dBV in a 20 kHz bandwidth. Such a low noise
level can obviate the need for a bypass switch in many applications.
The circuit in Figure 69 is a reciprocal parametric equalizer
yielding ±20 dB of cut or boost with variable bandwidth and
frequency. The frequency control range is 6.9:1, with the geometric
mean center frequency conveniently occurring at the midpoint
of the potentiometer setting. The center frequency is equal to
48 Hz/Ct, where Ct is the value of C1 and C2 in microfarads.
47µF
6.2kΩ
6.2kΩ
OUT
IN
620Ω
ADA4075-2
1/2
100Ω
BOOST
CUT
BANDWIDTH
1kΩ
5kΩ
2.7kΩ
ADA4075-2
1.5kΩ
1.5kΩ
C1*
C2*
1/2
2.5kΩ
2.5kΩ
1.3kΩ
2.5kΩ
1.3kΩ
1/2
2.5kΩ
620Ω
ADA4075-2
1/2
620Ω
ADA4075-2
*THE CENTER FREQUENCY IS AFFECTED BY THE VALUE OF C1 AND C2
(SEE THE LOW NOISE PARAMETRIC EQUALIZER SECTION FOR MORE DETAILS).
Figure 69. Low Noise Parametric Equalizer
Rev. C | Page 20 of 24
07642-074
FREQUENCY (GANGED POTENTIOMETER)
Data Sheet
ADA4075-2
SCHEMATIC
V+
+INA/
+INB
OUTA/
OUTB
V–
Figure 70. Simplified Schematic
Rev. C | Page 21 of 24
07642-072
–INA/
–INB
ADA4075-2
Data Sheet
OUTLINE DIMENSIONS
5.00 (0.1968)
4.80 (0.1890)
8
4.00 (0.1574)
3.80 (0.1497)
1
5
4
1.27 (0.0500)
BSC
0.25 (0.0098)
0.10 (0.0040)
COPLANARITY
0.10
SEATING
PLANE
6.20 (0.2441)
5.80 (0.2284)
1.75 (0.0688)
1.35 (0.0532)
0.51 (0.0201)
0.31 (0.0122)
0.50 (0.0196)
0.25 (0.0099)
45°
8°
0°
0.25 (0.0098)
0.17 (0.0067)
1.27 (0.0500)
0.40 (0.0157)
012407-A
COMPLIANT TO JEDEC STANDARDS MS-012-A A
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.
Figure 71. 8-Lead Standard Small Outline Package [SOIC_N]
Narrow Body (R-8)
Dimensions shown in millimeters and (inches)
0.30
0.25
0.18
2.00
BSC SQ
0.65
0.60
0.55
PIN 1 INDEX
AREA
0.50 BSC
5
8
4
1
TOP VIEW
0.60
0.55
0.50
BOTTOM VIEW
PIN 1
INDICATOR
SEATING
PLANE
0.20 REF
051608-A
0.05 MAX
0.02 NOM
Figure 72. 8-Lead Lead Frame Chip Scale Package [LFCSP_WD]
2 mm × 2 mm Body, Very Very Thin, Dual Lead
(CP-8-6)
Dimensions shown in millimeters
ORDERING GUIDE
Model 1
ADA4075-2ARZ
ADA4075-2ARZ-R7
ADA4075-2ARZ-RL
ADA4075-2ACPZ-R7
ADA4075-2ACPZ-RL
1
Temperature Range
−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
Package Description
8-Lead SOIC_N
8-Lead SOIC_N
8-Lead SOIC_N
8-Lead LFCSP_WD
8-Lead LFCSP_WD
Z = RoHS Compliant Part.
Rev. C | Page 22 of 24
Package Option
R-8
R-8
R-8
CP-8-6
CP-8-6
Branding
A0
A0
Data Sheet
ADA4075-2
NOTES
Rev. C | Page 23 of 24
ADA4075-2
Data Sheet
NOTES
©2008–2013 Analog Devices, Inc. All rights reserved. Trademarks and
registered trademarks are the property of their respective owners.
D07642-0-11/13(C)
Rev. C | Page 24 of 24
工商网监
湘ICP备2023018690号
