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DIGITAL-TO-ANALOG


Category: InstaCell™

Ridgetop’s audio DAC uses delta-sigma architecture. As shown in the illustration above, the DAC uses a digital interpolation filter, a digital second-order delta-sigma modulator, and a 32-tap analog reconstruction filter FIR. A fourth-order modulator is available to decrease oversampling ratio if the application requires. Applications for this core include audio commercial electronics, industrial control, and automotive.

Description

Ridgetop’s Audio DAC uses delta-sigma architecture.The DAC uses a digital interpolation filter, a digital second-order delta-sigma modulator, and a 32-tap analog reconstruction filter FIR. A fourth-order modulator is available to decrease oversampling ratio if the application requires. Applications for this core include audio commercial electronics, industrial control, and automotive. Table 1 gives the summary of DAC core specifications

Applications:

  • Consumer electronics
  • Audio commercial electronics
  • Hi-fi audio applications
  • Industrial controls
  • Automotive

DAC design

Features & Benefits

  • 16 bits of resolution (14-bit accuracy)
  • 100 KS/s sampling rate
  • Second-order digital delta-sigma modulator
  • TSMC 250 nm mixed-signal process
  • 3.0 to 3.6 V analog supply voltage
  • 2.25 to 2.75 V digital supply voltage
  • Area 0.8 mm2
  • Signal-to-noise: 94 dB at 50 kHz
  • Signal-to-noise and distortion: 92 dB at 50 kHz input
  • Includes complimentary license of patented PDKChek® die-level process monitor yield improvement solution

Core Specifications

PARAMETER SPECIFICATION
Accuracy 16-bit resolution (14-bit accuracy)
Sampling rate  100 KS/s
Digital input data format 16-bit parallel @ Fs (single-ended)
Sampling frequency (Fs)  0 Hz to 100 kHz
Digital input data frequency  45 kHz (max)
System clock frequency 25.6 MHz
Analog supply voltage 3.0 V (min), 3.3 V (typ), 3.6 V (max)
Analog supply current ~10 mA (typ)
Digital supply voltage  2.25 V (min), 2.5 V (typ), 2.75 V (max)
Digital supply current  ~22 mA (typ)
Temperature range -40 to +125 ºC
Signal-to-noise ratio (SNR) 94 dB
Signal-to-noise-and-distortion ratio (SNDR) 92 dB
Offset error ±30 mV (max)
Differential nonlinearity (DNL) ±0.1 LSB (max)
 Integral nonlinearity (INL) ±0.2 LSB (max)
Reference voltage  1.22 V
 Analog output voltage 1.65 V ±1.0 V (single-ended)
Center voltage  1.65 V
Load impedance 1 KΩ (min)