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OPA2652U Datasheet(PDF) 10 Page - National Semiconductor (TI) |
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OPA2652U Datasheet(HTML) 10 Page - National Semiconductor (TI) |
10 / 23 page www.ti.com APPLICATIONS INFORMATION Wideband Voltage Feedback Operation V O V I 1/2 OPA2652 50W R F 402W R G 402W R B 205W R M 57.6W Source +5V -5V R O 49.9W 0.1 F m 6.8 F m + 0.1 F m 0.1 F m 6.8 F m + 50 Load W = 1 - V O V I 1/2 OPA2652 +5V + -5V 50 Load W 49.9W 174W 49.9W V O V I 50 Source W R G 402W R F 402W + 6.8 F m 0.1 F m 6.8 F m 0.1 F m 0.1 F m OPA2652 SBOS125A – JUNE 2000 – REVISED MAY 2006 Voltage swings reported in the specifications are taken directly at the input and output pins, while The OPA2652 is a dual, low-power, wideband output powers (dBm) are at the matched 50 Ω load. voltage feedback operational amplifier. Each channel For the circuit of Figure 28, the total effective load is internally compensated to provide unity gain will be 100 Ω || 804Ω. Two optional components are stability. The OPA2652 voltage feedback architecture included in Figure 28. features true differential and fully symmetrical inputs. This architecture minimizes offset errors, making the An additional resistor (174 Ω) is included in series OPA2652 well-suited for implementing filter and with the noninverting input. Combined with the 25 Ω instrumentation designs. As a dual operational DC source resistance looking back towards the amplifier, OPA2652 is an ideal choice for designs signal generator, this additional resistor gives an that require multiple channels where reduction of input bias current cancelling resistance that matches board space, power dissipation and cost are critical. the 201 Ω source resistance seen at the inverting Its AC performance is optimized to provide a gain input (see the DC Accuracy and Offset Control bandwidth product of 200MHz and a fast rise time of section). In addition to the usual power-supply 2.0ns, which is an important consideration in decoupling capacitors to ground, a 0.1 µF capacitor is high-speed data conversion applications. The low included between the two power-supply pins. In DC input offset of ±1.5mV and drift of ±5µV/°C practical printed circuit board (PCB) layouts, this support high accuracy requirements. In applications optional-added capacitor typically improves the requiring a higher slew rate and wider bandwidth, 2nd-harmonic distortion performance by 3dB to 6dB. such as video and high bit rate digital Figure 29 shows the DC-coupled, gain of –1, bipolar communications, consider the dual current feedback supply circuit configuration that is the basis of the OPA2694, or the OPA2691. specifications and typical characteristics at G = –1. Figure 28 shows the DC-coupled, gain of +2, dual The input impedance matching resistor (57.6 Ω) used power-supply circuit configuration used as the basis for testing gives a 50 Ω input load. A resistor (205Ω) of the ±5V specifications and typical characteristics. connects the noninverting input to ground. This This configuration is for one channel. The other configuration provides the DC source resistance channel is connected similarly. For test purposes, the matching to cancel outputs errors arising from input input impedance is set to 50 Ω with a resistor to bias current. ground and the output impedance is set to 50 Ω with a series output resistor. Figure 29. DC-Coupled, G = –1, Bipolar Supply, Specification and Test Circuit Figure 28. DC-Coupled, G = +2, Bipolar Supply, Specification and Test Circuit 10 Submit Documentation Feedback |
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