SBAS452A September 2008 – January 2016 PCM3168A
Information in the following applications sections is not part of the TI component specification, and TI does not warrant its accuracy or completeness. TI’s customers are responsible for determining suitability of components for their purposes. Customers should validate and test their design implementation to confirm system functionality.
A typical circuit connection for six-channel analog in and eight-channel analog out is shown in Figure 54.
NOINDENT:C1 through C6 are 1-μF ceramic capacitors dependent on power-supply quality. C7 and C8 are 10-μF electrolytic capacitors dependent on power-supply quality. C9 and C10 are 10-μF electrolytic capacitors. C11 and C12 are 10-μF electrolytic capacitors. R1 through R12 are 22-Ω to 100-Ω resistors.
For this design example, use the parameters listed in Table 14.
|DESIGN PARAMETER||EXAMPLE VALUE|
|Audio input||PCM audio, differential analog audio|
|Audio output||PCM audio, differential analog audio|
It is recommended that input and output filters be used to condition the inputs and outputs. Input filters can be used to convert a single ended signal into a differential signal while also attenuating out of band noise. Another use of an input filter for the ADC it to reduce a 2-VRMS signal to a 1-VRMS input, which is the limit of the ADC input. Output filters can be used to go from differential to single ended, while reducing a differential signal that is 8 VPP to a 2-VRMS signal. The output filter can also attenuate out of band noise.
The PCM3168A has the capability of inputting 8 PCM channels over 4 data pins in normal PCM mode, or can operate in TDM mode to take in 8 channels on one data pin. The PCM3168A can also output up to 6 PCM channels over 3 data pins, or over 1 pin in TDM mode.
|–1 dB, N = 32768|
|0 dB, N = 32768|
Termination for mode control: Any one of the circuits shown in Figure 57 must be applied according to the necessary mode or configuration. Resistor value must be 220-kΩ, ±5% tolerant. The PowerPAD must be tied to the ground plane with enough electrical and thermal conductivity; see the example board layout in Figure 54.
NOINDENT:Amplifier is an NE5532A x1 or OPA2134 x1; R1 = 3-kΩ resistor; R2 = 1.5-kΩ resistor; R3 = 47-Ω resistor; C1 = 2200-pF capacitor; C2 = 0.022-μF capacitor; Gain = 0.5; f–3 dB = 48 kHz.
NOINDENT:Amplifier is an NE5532A x1/2 or OPA2134 x1/2; R1 = 15-kΩ resistor; R2 = 11-kΩ resistor; R3 = 820-Ω resistor; C1 = 1500-pF capacitor; C2 = 330-pF capacitor; Gain = 0.733; f–3 dB = 54 kHz.
NOINDENT:Amplifier is an NE5532A x1 or OPA2134 x1; R1 = 3-kΩ resistor; R2 = 1.5-kΩ resistor; R3 = 47-Ω resistor; C1 = 2200-pF capacitor; C2 = 0.01-μF capacitor; Gain = 1; f–3 dB = 48 kHz.