Download Low Distortion | 10-MHz | RRO Audio Op Amps

OPA168x: OPA1688 / OPA1689
4.5-36V | Low Nosie | Low Distortion | 10-MHz | RRO Audio Op Amps
Features
Benefits
•
Low THD+N: –109 dB (50 mW, 32 Ω, 1 kHz)
•
Low Noise: 8 nV/√Hz (1 kHz)
•
Low Quiescent Current: 1.6 mA/ch
•
Wide Bandwidth: 10 MHz
•
Strong Output Stage at: 75mA
•
RRO; Input Common Mode to GND
•
Wide Supply Range: ±2.25 V to ±18 V
•
µPackages: WSON-8 (3x3mm2), VQFN-16 (3.5x3.5mm2)
• Low noise and distortion making it perfect for
professional & prosumer audio equipment.
• Low quiescent current expands applicaitons to battery
life conscience end equipment
• Rail to rail output swing enables wider dynamic range.
• Common mode to ground offers excellent single
supply operation
• Strong output stage delivers higher output power while
maintaining low THD+N
Applications
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Headphone Driver
Analog and Digital Mixers
Audio Effects Processors
Transducer Amplifiers (Released / Sampling / Preview)
Dual (OPA1668): SOIC-8, WSON-8
Musical Instruments
Quad (OPA1689): SOIC-14, VQFN-16
A/V Receivers
DVD and Blu-Ray™ Players
Car Audio Systems
1
Headphone Amplifier Application
Design Requirements
OPA Requirements
•
Supply voltage: 10 V (±5 V)
•
Power supply range > 10V
•
Headphone loads: 16 Ω to 600 Ω
•
Capacitive load stability
•
THD+N: > 100 dB
(1-kHz fundamental, 1 VRMS in 32 Ω)
•
Low distortion | Low noise
•
Output power: 50 mW into 32 Ω
•
High output current
•
For portable devices: low power
consumption, small package
•
Low-power supply current, small
package
Headphone Amplifier Circuit Configuration
C1 47pF
ROUT
768 Ω
R2
R1
750 Ω
-5V
VAC
VDC
+
+
VAC
ROUT
Audio DAC
OPA1688
Maximum output power and THD+N before clipping
+5V
R3
768 Ω
Headphone
Output
R4
750 Ω
C2
47pF
TIPD189
Note: 22.4-kHz measurement bandwidth
Load impedance (Ω)
Max output power
before clipping (mW)
THD+N
(dB)
16
32
-104.1
32
50
-109.5
600
16
-117.8
2
OPA168x: OPA1688 / OPA1689
36-V | Low Nosie | Low Distortion | 10-MHz | RRO Audio Op Amps
Competitive
TI Audio. We're Listening.
•
•
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OPA1652/4
OPA1662/4
OPA1688/9
Improved performance over
commodity options at very
competitive prices
Combining innovative audio
products with best-in-class
systems expertise to deliver the
application flexibility, higher
performance and design
longevity you expect from an
industry leader.
High Grade
•
•
•
•
OPA1602/4
OPA1642/4
OPAx134
OPAx604
Link to TI Audio Op Amps
For professional and high-end
consumer customers looking to
further differentiate their products
Ultra High Performance
•
•
OPA1611/2
OPA1622
The absolute lowest noise, lowest
distortion op amps we have for
customers looking to deliver
reference-level performance
3
OPA168x: OPA1688 / OPA1689
36-V | Low Nosie | Low Distortion | 10-MHz | RRO Audio Op Amps
• Low Noise: 8nV/√Hz, Low Distortion: -109dB
–
Features
In order to achieve clarity and precision in applications,
such as Audio Effects Processors and Car Audio
Systems, low noise and distortion op amps are required
for success
• Isc (Short-circuit current): 75mA
Discovery
Questions
–
High output current capability makes it ideal for
Headphone applications
• WSON (3x3mm2) package
Pricing &
Availability
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–
–
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Reduces size
Reduces weight
Reduces thermal effects
Overall improves electrical performance
4
OPA168x: OPA1688 / OPA1689
36-V | Low Nosie | Low Distortion | 10-MHz | RRO Audio Op Amps
•
What is the supply voltage?
•
What is the requirement of distortion and noise level?
•
Any requirement on bandwidth and quiescent current?
•
What load resistor does the amplifier drive?
•
How much output current does the application require?
•
Is your design space-constrained?
Features
Discovery
Questions
Pricing &
Availability
5
OPA168x: OPA1688 / OPA1689
36-V | Low Nosie | Low Distortion | 10-MHz | RRO Audio Op Amps
• Pricing 1Ku
Features
– $0.75 (single in SOIC & WSON)
• Availability
Discovery
Questions
– Product Folder: Now
– Samples: Now
– Datasheet: Now
Pricing &
Availability
– Reference Design: TIPD189- Coming Soon
6
TI vs Competitors Audio
Company
TI
Part #
Input Type
Channel
Supply (V)
Rail-to-Rail
OPA1688
CMOS
2
4.5 to 36
Out
DC
1500
Vos (Max) (µV)
JRC
ST
3Peak
NJM8512
JFET
2
9 to 32
NO
TS922
Bipolar
2
2.7 to 12
In/Out
TP2604
CMOS
2
2.7 to 36
Out
1400
3000
4000
2
0.04
126
(V-) to (V+)-2
Offset Drift (Typ) (µV/˚C)
IB (Typ) (pA)
CMRR (dB) (min)
0.5
10
115
1
25
86
CM Input Range (V), Vs=±5V
(V-)-0.1 to (V+)-2
-2V to +2.5V
PSRR (dB) (Typ)
Aol (dB) (Typ)
Isc (Typ) (mA)
120
130
75
110
93
49
2
15000
60
No Data for ±5V
supply
85
No Data
80
2
3
7
18
2
3.2
4
1.3
1.2
No Data
10
6.5
No Data
9
No Data
17
0.005
-86
0.0001
-120
=Best
=Worst
130
130
25
AC
IQ per Channel (mA)
Typ
Max
GBW (Typ) (MHz)
Slew Rate (Typ) (V/µs)
1.6
1.8
10
8
Noise
Current Noise (1kHz) (fA/√Hz)
Voltage Noise (1kHz) (nV/√Hz)
THD+N (%), RL=2kΩ
THD+N (dB), RL=2kΩ
1.8
No Data
8
10
Audio Performance
0.00005
0.0005
-126
-106
Note:
1. NJM8512 has two grades (0.7mV/1.4mV Vos)
2. TS922 Open loop gain curve in the datasheet is not correct
7
Success Stories: OPA1688
Headphone Amplifier
Where We Won
Who: Hi-Fi Portable Music Player Manufacturer
What: PCM5242 + OPA1688
Where: Headphone Amplifier Circuit
Volume: 100kU/Y
How We Won
Hi-Fi Audio OPA1688
C1
Audio DAC
R2
R1
Application requires a high-resolution audio DAC
-5V
+
R3
and a high-fidelity audio op amp with low power
R4
C2
R4
C2
+5V
consumption and small package. The OPA1688
can deliver 50mW power with an extremely low
THD+N of -109dB into 32 Ω, while consuming only
PCM5242
+5V
R3
+
1.6mA/ch supply current. Along with that, the
-5V
OPA1688 comes in the WSON (3x3mm2), making it
ideal option for Hi-Fi portable music players.
R1
R2
C1
Headphone Amplifier Circuit Configuration