OPA2604-Q1 Datasheet, PDF (11/16 Pages) Texas Instruments – DUAL FET-INPUT, LOW DISTORTION OPERATIONAL AMPLIFIER

OPA2604ĆQ1
DUAL FETĆINPUT, LOW DISTORTION
OPERATIONAL AMPLIFIER
SGLS209 − NOVEMBER 2003
noise performance
Op amp noise is described by two parameters − noise voltage and noise current. The voltage noise determines
the noise performance with low source impedance. Low noise bipolar-input op amps such as the OPA27 and
OPA37 provide very low voltage noise. But if source impedance is greater than a few thousand ohms, the current
noise of bipolar-input op amps react with the source impedance and will dominate. At a few thousand ohms
source impedance and above, the OPA2604 will generally provide lower noise.
power dissipation
The OPA2604 is capable of driving 600 Ω loads with power supply voltages up to ±24 V. Internal power
dissipation is increased when operating at high power supply voltage. The typical performance curve, Power
Dissipation vs Power Supply Voltage, shows quiescent dissipation (no signal or no load) as well as dissipation
with a worst case continuous sine wave. Continuous high-level music signals typically produce dissipation
significantly less than worst case sine waves.
Copper leadframe construction used in the OPA2604 improves heat dissipation compared to conventional
plastic packages. To achieve best heat dissipation, solder the device directly to the circuit board and use wide
circuit board traces.
output current limit
Output current is limited by internal circuitry to approximately ±40 mA at 25°C. The limit current decreases with
increasing temperature as shown in the typical curves.
R4
22kΩ
C3
R1
VIN
2.7kΩ
R2
22kΩ
C1
3000pF
R3
10kΩ
C2
2000pF
100pF
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OPA2604
VO
fp = 20kHz
Figure 24. Three-Pole Low-Pass Filter
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