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Download Low Distortion | 10-MHz | RRO Audio Op Amps
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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 • • • • • • • • 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. • • • 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 – – – – 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