LT6604-5 PIN FUNCTIONS+OUTA, – OUTA (Pins 27, 29): Output Pins. Pins 27 and ground. A ground plane should be used. A poor ground 29 are the fi lter differential outputs for channel A. With a will increase noise and distortion. Pin 34 sets the output typical short-circuit current limit greater than ±40mA, each common mode voltage of the 1st stage of the fi lter in chan- pin can drive a 100Ω and/or 50pF load to AC ground. nel A. It has a 5.5kΩ impedance, and it can be overridden with an external low impedance voltage source. VMIDA (Pin 34): The VMIDA pin is internally biased at mid supply, see Block Diagram. For single supply operation Exposed Pad (Pin 35): V–. The Exposed Pad must be the VMIDA pin should be bypassed with a quality 0.01μF soldered to PCB. If V– is separate from ground, tie the ceramic capacitor to Pins V–. For dual supply operation, Exposed Pad to V–. Pin 34 can be bypassed or connected to a high quality DC BLOCK DIAGRAM V– NC V– VMIDA V+A NC NC 11k +INA V + LOWPASS IN A –OUTA RIN 806Ω FILTER STAGE 11k 400Ω V– NC NC OP AMP 400Ω + – + – V V OCM OCM –INA V – IN A – + – + +OUTA RIN 400Ω NC NC 400Ω 806Ω VOCMA V+A V+B V– V– 11k LOWPASS VMIDB 806Ω FILTER STAGE NC 11k 400Ω NC V– NC OP AMP +INB 400Ω V + IN B + – + –OUTB – RIN V V OCM OCM + NC – – + NC 400Ω –INB V – +OUTB IN B RIN 400Ω 806Ω NC NC 66045 BD VOCMB NC NC V+B 66045fa 8
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