OPA1642

Part: OPA1642AID (OPA1642, dual member of the OPA1641/OPA1642/OPA1644 family) — Texas Instruments

Type: JFET-Input Audio Operational Amplifier (Dual)

Description: Dual JFET-input, rail-to-rail output audio op amp with ±2.25 V to ±18 V supply, 11 MHz gain-bandwidth, 20 V/μs slew rate, 5.1 nV/√Hz noise at 1 kHz and 0.00005% THD+N.

Operating Conditions:

• Supply voltage: 4.5–36 V single supply, or ±2.25 V to ±18 V dual supply
• Specified temperature: -40 to 85 °C
• Operating range: -55 to 125 °C

Absolute Maximum Ratings:

• Input current: ±10 mA
• Input voltage: (V-) - 0.5 V to (V+) + 0.5 V
• Max junction temperature: 150 °C
• Storage temperature: -65 to 150 °C
• ESD: ±3000 V HBM, ±1000 V CDM

Key Specs:

• THD+N: 0.00005% (-126 dB) at G = +1, f = 1 kHz, VO = 3 VRMS
• Gain-bandwidth product: 11 MHz (G = 1)
• Slew rate: 20 V/μs; full-power bandwidth 3.2 MHz (VO = 1 VP)
• Input voltage noise density: 5.1 nV/√Hz at 1 kHz; 4.3 μVPP (20 Hz to 20 kHz)
• Input bias current: ±2 pA typ, ±20 pA max
• Quiescent current: 1.8 mA typ, 2.3 mA max per amplifier (IOUT = 0 A)
• Output swing from rail: 0.2 V (RL = 10 kΩ), 0.35 V (RL = 2 kΩ)
• Short-circuit current: 36 mA source, -30 mA sink

Features:

• True JFET input with low input bias current
• Unity-gain stable
• No phase reversal
• Rail-to-rail output
• Completely independent channels for low crosstalk in dual and quad versions
• Single, dual, and quad versions available

Applications:

• Professional audio equipment
• Analog and digital mixing consoles
• Broadcast studio equipment
• High-end A/V receivers
• High-end Blu-ray™ players

Package:

• SOIC (8), 4.90 mm × 3.90 mm (D)
• VSSOP (8), 3.00 mm × 3.00 mm (DGK)

• 1 · Superior Sound Quality
• True JFET Input Operational Amplifier With Low Input Bias Current
• Low Noise: 5.1 nV/ √ Hz at 1 kHz
• Ultralow Distortion: 0.00005% at 1 kHz
• High Slew Rate: 20 V/ μ s
• Unity Gain Stable
• No Phase Reversal
• Low Quiescent Current: 1.8 mA per Channel
• Rail-to-rail Output
• Wide Supply Range: ±2.25 V to ±18 V
• Single, Dual, and Quad Versions Available

• Professional Audio Equipment
• Analog and Digital Mixing Consoles
• Broadcast Studio Equipment
• High-End A/V Receivers
• High-End Blu-ray™ Players

at TA = 25°C, VS = 4.5 V to 36 (±2.25 V to ±18 V), RL = 2 k Ω connected to midsupply, and VCM = VOUT = midsupply (unless otherwise noted)

over operating free-air temperature range (unless otherwise noted) (1)

over operating free-air temperature range (unless otherwise noted)

The OPA1641, OPA1642, and OPA1644 are unity-gain stable, audio operational amplifiers with very low noise, input bias current, and input offset voltage. Applications with noisy or high-impedance power supplies require decoupling capacitors placed close to the device pins. In most cases, 0.1μ F capacitors are adequate. Figure 32 shows a simplified schematic of the OPA1641.

Figure 32. Simplified Internal Schematic