PCM1681 105dB SNR 8-Channel Audio DAC with TDM Mode | TI.com

PCM1681
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105dB SNR 8-Channel Audio DAC with TDM Mode

 

Description

The PCM1681 and PCM1681-Q1 are CMOS monolithic integrated circuits which feature an eight-channel 24-bit audio digital-to-analog converter (DAC) and support circuitry in small 28-lead TSSOP PowerPAD packages. The DACs utilize Burr-Brown's enhanced multilevel delta-sigma (ΔΣ) architecture to achieve excellent signal-to-noise performance and a high tolerance to clock jitter.

The PCM1681 and PCM1681-Q1 accept TDM (time-division multiplexed) format in addition to industry-standard audio data formats with 16- to 24-bit audio data width. Sampling rates up to 200 kHz are supported. The PCM1681 and PCM1681-Q1 provide a sub-set of user-programmable functions through a parallel control port, in addition to a full set of user-programmable functions through a serial control port, SPI, or I2C. The PCM1681 supports –40°C to +85°C for consumer grade applications and the PCM1681-Q1 supports –40°C to +105°C for automotive audio grade systems.

Features

  • Qualified for Automotive Applications: PCM1681-
    Q1
  • 24-Bit Resolution
  • Analog Performance:
    • Dynamic Range: 105 dB Typical
    • SNR: 105 dB Typical
    • THD+N: 0.002% Typical
    • Full-Scale Output: 3.75 VPP Typical
  • 4×/8× Oversampling Interpolation Filter:
    • Stop-Band Attenuation: –57 dB
    • Pass-Band Ripple: ±0.015 dB
  • Sampling Frequency: 5 kHz to 200 kHz
  • System Clock: 128 fS, 192 fS, 256 fS, 384 fS,
    512 fS, 768 fS, or 1152 fS with Autodetect
  • Zero Flags for Selectable Channel Combinations
  • Flexible Mode Control:
    • SPI™/I2C™ Dual Mode for Serial Port
    • Parallel Hardware Control with 4 Functions
  • User-Programmable Functions (in SPI/I2C):
    • Flexible Audio Data Formats:
      • Right-Justified, I2S™, Left-Justified, TDM,
        DSP
      • 16- and 24-Bit Audio Data
    • Digital Attenuation: Mode Selectable
      • 0 dB to –63 dB, 0.5 dB/step
      • 0 dB to –100 dB, 1 dB/step
    • Soft Mute
    • Digital De-Emphasis
    • Digital Filter Roll-Off: Sharp or Slow
    • Oversampling Mode
  • User-Programmable Functions (in H/W):
    • Flexible Audio Data Formats:
      • Right-Justified, I2S, Left-Justified, TDM
      • Soft Mute
      • Digital De-Emphasis
      • Oversampling Mode
  • Power Supply Voltage: 5-V Analog, 3.3-V Digital
  • Package: 28-Lead HTSSOP PowerPAD
  • Operation Temperature Range:
    • –40°C to 85°C for Consumer Grade
    • –40°C to 105°C for Automotive Audio Grade

Parametrics

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Part number Order DAC channels Analog inputs Analog outputs DAC SNR (Typ) (dB) Sampling rate (Max) (kHz) Control interface Resolution (Bits) Architecture Package size: mm2:W x L (PKG) Approx. price (US$)
PCM1681 Order now 8     0     8     105     200     SPI
I2C
H/W    
24     Current Segment DAC     28HTSSOP: 43 mm2: 4.4 x 9.7 (HTSSOP | 28)     1.40 | 1ku    
PCM1680 Samples not available 8     0     8     105     192     SPI
I2C    
24     Delta-Sigma     28SSOP: 59 mm2: 6 x 9.9 (SSOP | 28)     1.99 | 1ku    
PCM1690 Order now 8     0     8     113     192     SPI
I2C
H/W    
24     Current Segment DAC     48HTSSOP: 101 mm2: 8.1 x 12.5 (HTSSOP | 48)     2.35 | 1ku