Datasheet

PCM.VFS
PCM.VCK
PCM.VDR
PCM.VDX
15
14 1
0
49dummybits
15
14
15
14
1
0
49dummybits
15
14
P3 P3
P4 P4
P1
P1
P0
P2 P2
P2
P5 P5
P5
032-081
TPS65950
www.ti.com SWCS032E–OCTOBER 2008–REVISED JANUARY 2011
Table 13-8 lists the master mode switching characteristics of the TDM interface.
Table 13-8. TDM Interface Master Mode Switching Characteristics
Notation Parameter Min Max Unit
T0 t
c(CLK)
Cycle time, TDM.CLK
(1)
1/64 * Fs ns
T1 t
w(CLK)
Pulse duration, TDM.CLK high or low
(2)
0.45*P 0.55*P ns
T2 t
d(CLKL-SYNC)
Delay time, TDM.CLK rising edge to TDM.SYNC transition –10 10 ns
T5 t
d(CLKL-DOUT)
Delay time, TDM.CLK rising edge to TDM.DOUT transition –10 12 ns
(1) Fs = 8 to 48 kHz; 96 kHz for RX path only
(2) P = TDM.CLK period
13.5 Voice/Bluetooth PCM Interfaces
The PCM interface transfers voice data at 8-kHz (default narrowband mode) or 16-kHz (wideband mode)
sample rates. The CM interface can act as a slave or master. No PLL is used for the PCM interface, but
dividers are used to derive the 8- or 16-kHz clock from HFCLKIN (only when HFCLKIN = 26 MHz). If the
system master clock is not 26 MHz, the voice PCM interface is not available.
For the Bluetooth interface, the PCM is supported to transfer voice data to the Bluetooth chip at 8-kHz
(default narrowband mode) or 16-kHz sample rate.
The TPS65950 acts as a master for the Bluetooth interface. The frame synchronization and the bit clock
are shared from the voice PCM interface. If the system master clock is not 26 MHz, the Bluetooth
interface is not available.
Two modes are available for the PCM interfaces: mode 1 (writing on the PCM_VCK rising edge) and
mode 2 (writing on the PCM_VCK falling edge).
Table 13-9 and Table 13-10 assume testing over the recommended operating conditions (see Figure 13-5
and Figure 13-6).
Figure 13-5. Voice/BT PCM Interface—Master Mode (Mode 1)
Copyright © 2008–2011, Texas Instruments Incorporated Timing Requirements and Switching Characteristics 149
Submit Documentation Feedback
Product Folder Link(s): TPS65950