SLAAEE0A November   2023  – July 2024 TAC5111 , TAC5112 , TAC5211 , TAC5212 , TAC5412-Q1 , TAD5112 , TAD5142 , TAD5212 , TAD5212-Q1 , TAD5242

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1Introduction
  5. 2Output Configuration
    1. 2.1 Common-mode Generation
    2. 2.2 Output Load Range for Line Output And Headphone
    3. 2.3 Mixing and Bypass
  6. 3Available Settings for Hardware-Controlled Devices
  7. 4Summary
  8. 5References
  9. 6Revision History

Output Load Range for Line Output And Headphone

The TAD5212-Q1 supports a variety of loads, including headphone, lineout, and receiver amplifiers. Load drive configurations are available for each pin independently. OUT1P_DRIVE[1:0] (OUT1x_CFG[7:6]) configures the load drive capability for the OUT1P pin. OUT1M_DRIVE[1:0], OUT2P_DRIVE[1:0], and OUT2M_DRIVE[1:0] are the output drive control for OUT1M, OUT2P, and OUT2M, respectively.

The output is configurable as either Line Out or Head Phone Load. The range of the load for Line Out is from 600Ω to infinity (an open) with a wide capacitor range (0 to 2nF) with nominal value of 10kΩ. The range of load for Headphone is from 4Ω to 600Ω with a nominal value of 16Ω with the wide capacitor range (0 to 2nF). The TAD5212-Q1 is capable of driving a wide range of loads, extending from 4Ω to infinity (an open). With a 4Ω load, there is stability concern and thus need to increase the bias current to increase the bandwidth. This can be done by adjusting the respective register map.

The Output Stage is designed to support a maximum power of 62.5mW on the single-ended 16Ω configuration (1 VRMS) and 125mW on the fully-differential 32Ω configuration (2 VRMS).

Setting the diver strength is also possible to drive higher load at the expense of degraded bandwidth. In general, the driver strength can have four distinct options, as shown in Table 2-2.

Table 2-2 Driver Strength Options
Value Application
b'00 For Line out driver with minimum 300Ω impedance
b'01 For Headphone driver with minimum 4Ω impedance
b'10 For 4Ω load
b'11 Fully-differential Receiver and Debug