PCM5242

Part: PCM5242 (PCM5242RHBR) — Texas Instruments

Type: Stereo Audio DAC (differential output, DirectPath™ ground-centered)

Description: 32-bit, 384-kHz PCM stereo DAC with 4.2 VRMS ground-centered differential outputs, 114 dB SNR and dynamic range, integrated PLL, charge pump and miniDSP, powered from a single 3.3 V supply (1.8 V or 3.3 V digital).

Operating Conditions:

• AVDD: 3.0–3.46 V in VCOM mode, 3.2–3.46 V in VREF mode (3.3 V nominal)
• CPVDD: 3.1–3.46 V
• DVDD: 1.65–1.95 V (1.8 V) or 3.1–3.46 V (3.3 V)
• Operating junction temperature: -25 to 85 °C
• Maximum system clock: 50 MHz
• Line output load: ≥2 kΩ

Absolute Maximum Ratings:

• Supply voltage (AVDD, CPVDD, DVDD): -0.3 to 3.9 V
• LDOO supply with DVDD at 1.8 V: -0.3 to 2.25 V
• Digital input voltage: -0.3 to 2.25 V (DVDD at 1.8 V); -0.3 to 3.9 V (DVDD at 3.3 V)
• Analog input voltage: -0.3 to 3.9 V
• Storage temperature: -40 to 125 °C
• ESD: HBM ±2500 V, CDM ±1500 V

Key Specs:

• THD+N at -1 dBFS: -94 dB typ (fS = 48 kHz, 96 kHz and 192 kHz); -87 dB max at 48 kHz
• Dynamic range (EIAJ, A-weighted): 114 dB typ, 108 dB min at fS = 48 kHz
• SNR (EIAJ, A-weighted): 114 dB typ
• SNR with analog mute: 123 dB typ, 113 dB min
• Channel separation: 109/103 dB typ, 100/95 dB min
• Full-scale differential output: 4.2 VRMS (ground-centered)
• Sampling frequency: 8 kHz to 384 kHz
• Digital filter latency: 20/fS (normal), 3.5/fS (low latency)
• Digital I/O: VIH 0.7×DVDD min, VIL 0.3×DVDD max
• Thermal resistance RθJA: 72.2 °C/W (RHB)

Features:

• Differential DirectPath™ ground-biased outputs; no DC blocking capacitors required
• Integrated negative charge pump
• Low out-of-band noise
• Selectable digital-filter latency and performance
• Intelligent muting with soft ramp and analog mute
• Integrated audio PLL generating SCK internally from BCK
• Accepts 16-, 24- and 32-bit audio data
• I²S, left-justified, right-justified and TDM formats
• SPI or I²C control, or hardware configuration
• Automatic power-save when LRCK and BCK stop
• 1.8 V or 3.3 V failsafe LVCMOS digital inputs
• Integrated power-on reset
• Programmable miniDSP core

Applications:

• HiFi smartphone
• A/V receivers
• DVD and BD players
• HDTV receivers

Package:

• VQFN-32 (RHB), 5.00 mm × 5.00 mm

• HiFi Smartphone
• A/V Receivers
• DVD, BD Players
• HDTV Receivers

The PCM5242 supports control from I2C, SPI and Hardware Modes (referred to as HW mode). Selection of modes is done using Mode1 and Mode2 pins. (See Table 1)

SPI Mode is selected by pulling MODE1 to DVDD.

I 2 C Mode is selected by pulling MODE1 to DGND and Mode2 to DVDD.

Hardware Control Mode is selected by pulling both MODE1 and MODE2 pins to DGND.

All specifications at TA = 25°C, AVDD = CPVDD = DVDD = 3.3V, fS = 48kHz, system clock = 512fS and 24-bit data unless otherwise noted.

over operating free-air temperature range (unless otherwise noted)

Differential outputs DAC's are regularly used where higher performance is required from them compared to single ended output DACs. They offer twice as much output voltage for the same power supply, along with noise cancelling effect of differential signaling. The PCM5242 makes an ideal front end for both analog input speaker amplifiers and headphone amplifiers with its higher voltage differential output and low noise floor.