5-Channel Phased Array Sine Encoder (diameter 39 mm, 2048 PPR)

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iC-PD3948 is an optical sensor IC with integrated photodiodes whose signal currents are converted into output voltages by low-noise transimpedance amplifiers.
As the pin names would suggest, iC-PD3948 is typically applied as a sine encoder for motor feedback systems. To this end, iC-PD3948 provides sine and cosine signals with both a high resolution of 2048 PPR (plus an additional index signal) and a low resolution of 1 PPR (at C/D).
All code disc signal tracks are evaluated differentially; the high resolution sine signals are read by photodiodes in a phased array. The layout of the signal  amplifiers is such that there is good paired channel matching, reducing the time and effort required for calibration to an absolute minimum.
The spectral sensitivity ranges from visible to near infrared light, with the maximum sensitivity close to a wavelength of 680 nm. An output voltage of 1 V is typical in low light conditions.


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Compact encoder sensor with differential scanning and sine outputs
Phased-array design for excellent signal matching
Reduced cross talk due to moderate track pitch
Ultra low dark currents for operation to high temperature
Low noise amplifiers with high transimpedance of typ. 4MΩ
Short-circuit-proof, low impedance voltage outputs for enhanced EMI tolerance
Space saving QFN and optoBGA packages (RoHS compliant)
Low power consumption from single 4.5 to 5.5 V supply
Operational temperature range of -40 to +110 C
Code disc available:
(2048PPR +C/D 1 PPR, diameter 39 mm)


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