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
P5 P5
P1
P1
P0
P6 P6
P7P7
032-082
TPS65950
SWCS032E–OCTOBER 2008–REVISED JANUARY 2011 www.ti.com
Figure 13-6. Voice PCM Interface—Slave Mode (Mode 1)
The timing requirements in Table 13-9 are valid on the following conditions of input slew and output load:
• Rise and fall time range of inputs (SYNC, DIN) is t
R
/t
F
= 1.0 ns/6.5 ns
• Capacitance load range of outputs (CLK, SYNC, DOUT) is C
Load
= 1 pF/30 pF
Table 13-9 lists the timing requirements for the voice PCM interface, mode 1.
Table 13-9. Voice PCM Interface Timing Requirements (Mode 1)
Notation Parameter Min Max Unit
Voice/Bluetooth PCM Master Mode
P3 t
su(VDR-VCK)
Setup time, PCM.VDR valid to PCM. VCK transition
(1)
30 ns
P4 t
h(VDR-VCK)
Hold time, PCM.VDR valid from PCM.VCK transition
(1)
0 ns
Voice PCM Slave Mode
P0 t
c(VCK)
Cycle time, PCM.VCK
(2)
1/(33 to 65 * Fs) ns
P1 t
w(VCK)
Pulse duration, PCM.VCK high or low
(3)
0.45 * P 0.55 * P ns
P3 t
su(VDR-VCK)
Setup time, PCM.VDR valid to PCM. VCK transition
(1)
10 ns
P4 t
h(VDR-VCK)
Hold time, PCM.VDR valid from PCM. VCK transition
(1)
5 ns
P6 t
h(VFS-VCK)
Hold time, PCM.VFS valid from PCM.VCK transition
(1)
5 ns
P7 t
SU(VFS-VCK)
Setup time, PCM.VFS valid to PCM. VCK transition
(1)
10 ns
(1) Writing on PCM.VCK rising edge (mode 1) and writing on PCM.VCK falling edge (mode 2).
(2) Fs = 8 or 16 kHz
(3) P = PCM.CLK period
Table 13-10 lists the switching characteristics of the voice PCM interface, mode 1.
Table 13-10. Voice PCM Interface Switching Characteristics (Mode 1)
Notation Parameter Min Max Unit
Voice/Bluetooth PCM Master Mode
P0 t
c(VCK)
Cycle time, PCM.VCK
(1)
1/65 * Fs ns
P1 t
w(VCK)
Pulse duration, PCM.VCK high or low
(2)
0.45 * P 0.55 * P ns
(1) Fs = 8 or 16 kHz
(2) P = PCM.CLK period
150 Timing Requirements and Switching Characteristics Copyright © 2008–2011, Texas Instruments Incorporated
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