Current-to-Voltage Converter Circuit for Audio DACs
Many high-performance audio digital-to-analog converters (DACs) feature a current output that must be converted into a voltage output for use with audio amplifiers. In premium automotive audio applications, for example, it is critical that the DAC signal-to-noise ratio (SNR) and total harmonic distortion plus noise (THD+N) performance is not compromised by the current-to-voltage (I-V) output stage. The first stage of the circuit converts the current output to a voltage output by providing a virtual ground potential to the OUTP and OUTN nodes of the DAC. The current flowing from the DAC then creates a voltage across the resistor, R4, R18, in the feedback loop. Note that current-output audio DACs have a common mode current that creates an offset to confirm that the DAC is always sourcing current. This common-mode current also results in the output of the first stage always being a negative value. The supplies of the amplifiers of the circuit are not required to be symmetrical. The second stage of the circuit is a differential amplifier that converts the differential voltage of the first stage into a single-ended output voltage. In the third-order, low-pass filter (LPF) circuit, the output level of 2.1 V RMS and 123-dB signal-to noise ratio is achieved. A NE5534 operational amplifier is used for the I/V circuit to obtain the specified performance. Dynamic performance such as the gain bandwidth, settling time, and slew rate of the operational amplifier affects the audio dynamic performance of the I/V section. The current of the PCM1795 device on each of the output pins (IOUTL+, IOUTL–, IOUTR+, IOUTR–) is 4 mA-PP at 0 dB (full-scale).
Features
- Power Input +/-15V DC (Dual 15V DC)
- On Board Power LED
- Stereo Output Signal 2.1V RMS
- Header Connector for Input Signals
- Screw Terminals for Audio Output
- PCB Dimensions 46.99 x 33.66 mm
Connections
- CN1 Signal Inputs: Pin 1 = L-Channel -In, Pin 2 = L-Channel +In, Pin 3 = R-Channel -In, Pin 4 = R-Channel +In, Pin 5 = GND
- CN2 Power Input: Pin 1 = +VCC, Pin 2 = GND, Pin 3 = -VEE
- CN3 Signal Output: Pin 1 = Left Channel Output, Pin 2 = GND
- CN4 Signal Output: Pin 1 = Right Channel Output, Pin 2 = GND
Share
Many high-performance audio digital-to-analog converters (DACs) feature a current output that must be converted into a voltage output for use with audio amplifiers. In premium automotive audio applications, for example, it is critical that the DAC signal-to-noise ratio (SNR) and total harmonic distortion plus noise (THD+N) performance is not compromised by the current-to-voltage (I-V) output stage. The first stage of the circuit converts the current output to a voltage output by providing a virtual ground potential to the OUTP and OUTN nodes of the DAC. The current flowing from the DAC then creates a voltage across the resistor, R4, R18, in the feedback loop. Note that current-output audio DACs have a common mode current that creates an offset to confirm that the DAC is always sourcing current. This common-mode current also results in the output of the first stage always being a negative value. The supplies of the amplifiers of the circuit are not required to be symmetrical. The second stage of the circuit is a differential amplifier that converts the differential voltage of the first stage into a single-ended output voltage. In the third-order, low-pass filter (LPF) circuit, the output level of 2.1 V RMS and 123-dB signal-to noise ratio is achieved. A NE5534 operational amplifier is used for the I/V circuit to obtain the specified performance. Dynamic performance such as the gain bandwidth, settling time, and slew rate of the operational amplifier affects the audio dynamic performance of the I/V section. The current of the PCM1795 device on each of the output pins (IOUTL+, IOUTL–, IOUTR+, IOUTR–) is 4 mA-PP at 0 dB (full-scale).
Features
- Power Input +/-15V DC (Dual 15V DC)
- On Board Power LED
- Stereo Output Signal 2.1V RMS
- Header Connector for Input Signals
- Screw Terminals for Audio Output
- PCB Dimensions 46.99 x 33.66 mm
Connections
- CN1 Signal Inputs: Pin 1 = L-Channel -In, Pin 2 = L-Channel +In, Pin 3 = R-Channel -In, Pin 4 = R-Channel +In, Pin 5 = GND
- CN2 Power Input: Pin 1 = +VCC, Pin 2 = GND, Pin 3 = -VEE
- CN3 Signal Output: Pin 1 = Left Channel Output, Pin 2 = GND
- CN4 Signal Output: Pin 1 = Right Channel Output, Pin 2 = GND
Dotfry has partnered with reputed logistic partners for our logistic services, to ensure that all our products reach you in the best of conditions with no damages. We ensure you that we use packaging materials of the best quality, which is sourced from reliable vendors, and ensure thorough testing of package worthiness before using them for shipping and delivery of our products.
Related Products
