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Número de pieza OPA1678
Descripción Low-Distortion Audio Operational Amplifiers
Fabricantes Texas 
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OPA1678, OPA1679
SBOS855 – FEBRUARY 2017
OPA167x Low-Distortion Audio Operational Amplifiers
1 Features
1 Low Noise: 4.5 nV/Hz at 1 kHz
• Low Distortion: 0.0001% at 1 kHz
• High Open-Loop Gain: 114dB
• High Common-Mode Rejection: 110 dB
• Low Quiescent Current:
2 mA Per Channel
• Low Input Bias Current: 10 pA (Typical)
• Slew Rate: 9 V/μs
• Wide Gain Bandwidth: 16 MHz (G = 1)
• Unity-Gain Stable
• Rail-to-Rail Output
• Wide Supply Range:
±2.25 V to ±18 V, or 4.5 V to 36 V
• Dual-Channel and Quad-Channel Versions
• Small Package Sizes:
Dual-Channel: SO-8 and MSOP-8
Quad-Channel: SO-14 and TSSOP-14
2 Applications
• Analog Signal Conditioning
• Analog and Digital Mixers
• Audio Effects Pedals
• A/V Receivers
• Car Audio Systems
3 Description
The OPA1678 (dual-channel) and OPA1679 (quad-
channel) operational amplifiers offer higher system-
level performance over legacy op amps commonly
used in audio circuitry. The OPA167x amplifiers
achieve a low 4.5-nV/Hz noise density and low
distortion of 0.0001% at 1 kHz which improves audio
signal fidelity. They also offer rail-to-rail output swing
to within 800 mV with a 2-kΩ load, which increases
headroom and maximizes dynamic range.
The OPA1678 and OPA1679 operate over a very
wide supply range of ±2.25 V to ±18 V or (4.5 V to 36
V) on only 2 mA of supply current to accommodate
the power supply constraints of many types of audio
products. These op amps are unity-gain stable and
provide excellent dynamic behavior over a wide range
of load conditions allowing them to be used in many
audio circuits.
The OPA167x amplifiers use completely independent
internal circuitry for lowest crosstalk and freedom
from interactions between channels, even when
overdriven or overloaded.
The OPA167x temperature ranges are specified from
–40°C to +85°C.
SoundPlus™
Device Information(1)
PART NUMBER
PACKAGE
BODY SIZE (NOM)
OPA1678
SOIC (8)
VSSOP (8)
4.90 mm × 3.91 mm
3.00 mm × 3.00 mm
OPA1679
SOIC (14)
TSSOP (14)
8.65 mm × 3.91 mm
5.00 mm × 4.40 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
Simplified Internal Schematic
THD+N vs Frequency (2-kΩ Load)
V+
Tail
Current
VBIAS1
0.1 Gain = 10 V/V
Gain = 1 V/V
Gain = -1 V/V
VIN+ 0.01
Class AB
Control
VO
Circuitry
VIN- 0.001
VBIAS2
-60
-80
-100
0.0001
-120
V-
Copyright © 2017, Texas Instruments Incorporated
0.00001
-140
10 100 1k 10k
Frequency (Hz)
C002
1
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCTION DATA.

1 page




OPA1678 pdf
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OPA1678, OPA1679
SBOS855 – FEBRUARY 2017
6 Specifications
6.1 Absolute Maximum Ratings
over operating free-air temperature range (unless otherwise noted)(1)
Voltage
Current
Temperature
Supply voltage, VS = (V+) – (V–)
Input
Input (all pins except power-supply pins)
Output short-circuit(2)
Operating, TA
Junction, TJ
Storage, Tstg
MIN MAX
40
(V–) – 0.5
(V+) + 0.5
–10 10
Continuous
–55 125
200
–65 150
UNIT
V
V
mA
°C
°C
°C
(1) Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings
only, which do not imply functional operation of the device at these or any other conditions beyond those indicated under Recommended
Operating Conditions. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
(2) Short-circuit to VS / 2 (ground in symmetrical dual-supply setups), one amplifier per package.
6.2 ESD Ratings
V(ESD)
Electrostatic discharge
Human-body model (HBM), per ANSI/ESDA/JEDEC JS-001(1)
Charged-device model (CDM), per JEDEC specification JESD22-C101(2)
Machine model (MM)
VALUE
±2000
±1000
±200
(1) JEDEC document JEP155 states that 500-V HBM allows safe manufacturing with a standard ESD control process.
(2) JEDEC document JEP157 states that 250-V CDM allows safe manufacturing with a standard ESD control process.
UNIT
V
6.3 Recommended Operating Conditions
over operating free-air temperature range (unless otherwise noted)
Supply voltage
TA Operating temperature
MIN
4.5 (±2.25)
–40
NOM
MAX
36 (±18)
85
UNIT
V
°C
Copyright © 2017, Texas Instruments Incorporated
Product Folder Links: OPA1678 OPA1679
Submit Documentation Feedback
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OPA1678 arduino
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Typical Characteristics (continued)
at TA = 25°C, VS = ±15 V, and RL = 2 kΩ, unless otherwise noted
VIN
VOUT
OPA1678, OPA1679
SBOS855 – FEBRUARY 2017
VIN
VOUT
Time (0.2 s/div)
Gain = 1 V/V
CL = 100 pF
C009
Figure 13. Small-Signal Step Response (100 mV)
VIN
VOUT
Time (0.2 s/div)
Gain = –1 V/V
CL = 100 pF
C009
Figure 14. Small-Signal Step Response (100 mV)
VIN
VOUT
Time (1 s/div)
Gain = +1 V/V
RF = 2 kΩ
C009
CL = 100 pF
Figure 15. Large-Signal Step Response
145
140
135
130
125
120
115
110
105
100
±40
±15
10 35 60
Temperature (ƒC)
85 110
C008
Figure 17. Open-Loop Gain vs Temperature
Time (1 s/div)
Gain = –1 V/V
CL = 100 pF
Figure 16. Large-Signal Step Response
1000
C009
500
0
-500
-1000
-1500
-2000
±40
IB(N)
IB(P)
I(OS)
±15
10 35 60
Temperature (ƒC)
85 110
C008
Figure 18. IB and IOS vs Temperature
Copyright © 2017, Texas Instruments Incorporated
Product Folder Links: OPA1678 OPA1679
Submit Documentation Feedback
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