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nimeni_altci

Problema driver ADC AD8138

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Salutare,

 

Am o problema in legatura cu driverul de ADC AD8138. Am realizat schema din datasheet(e atasata), si am aplicat semnal sinusoidal la intrare. Acesta nu vrea sa mearga. Pe una din iesiri am 4.6V DC, iar pe cealalta -3.6V DC. Operationalul e alimentat la +-5V. Este foarte ciudat, mai ales ca schema e banala. Care credeti ca e problema?

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Ai incercat sa-i pui o sarcina intre iesiri. Cred ca vrea una, dar n-am gasit in DS citind repede.

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Scuze ca insist, sarcina e ceva intre 500 si 800 ohmi?Altfel, un email la ADI. DS spune ca debalansarea iesirilor e minima chiar cu rezistente usor diferite. Se vorbeste de toleranta de 1%, ceea ce nu e o problema in SMT.Ai o poza cu montajul?LE: PIN 2 - Voltage applied to this pin sets the common-mode output voltage with a ratio of 1:1. For example, 1 V dc on VOCM sets the dc bias level on +OUT and −OUT to 1 V.LLE: Ceea ce inseamna ca semnalul tau de intrare trebuie sa fie 1.65Vpp.Vezi CN-0061 figura 1.

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