TCM320AC56 Datasheet, PDF (11/23 Pages) Texas Instruments – VOICE-BAND AUDIO PROCESSORS (VBAP)

TCM320AC56, TCM320AC57
VOICE-BAND AUDIO PROCESSORS (VBAP)
SLWS016A – JUNE 1996 – REVISED APRIL 1997
propagation delay times over recommended ranges of operating conditions, variable-data-rate mode (see
Figure 4)
PARAMETER
tpd6
FSX high to DOUT bit 1 valid
tpd7
DCLKX high to DOUT valid, bits 2 to n
tpd8
FSX low to DOUT bit n Hi-Z
TEST CONDITIONS
CL = 0 to 10 pF
CL = 0 to 10 pF
MIN MAX UNIT
30 ns
40 ns
20
ns
PARAMETER MEASUREMENT INFORMATION
All timing parameters are referenced to V_IH and V_IL. Bit 1 = MSB (most significant bit) and is clocked in first on DIN
or clocked out first on DOUT. Bit N = LSB (least significant bit) and is clocked in last on DIN or is clocked out last on
DOUT. N = 8 for the companded mode, and N = 16 for the linear mode.
Receive Time Slot
0
1
2
3
4
CLK
tsu(FSR)
80%
20%
th(FSR)
FSR
N–2
N–1
20%
N
N+1
80%
See Note A
DIN N – 1
N
1
2
See Note C
NOTES: A. This window is allowed for FSR high.
B. This window is allowed for FSR low.
C. Transitions are measured at 50%.
See Note B
th(DIN)
3
4
N–2
N–1
N
1
tsu(DIN)
Figure 1. Fixed-Data Rate Mode, Receive Side Timing Diagram
CLK
0
1
80%
20%
tsu(FSX)
FSX
2
th(FSX)
Transmit Time Slot
3
4
N–2
N–1
N
N+1
80%
20%
See Note A
tpd2
See Note B
tpd3
DOUT
See Note C
tpd1
1
2
3
N–2
N–1
N
tpd5
TSX
20%
tpd4
NOTES: A. This window is allowed for FSX high.
B. This window is allowed for FSX low (th(FSX) max determined by data collision considerations).
C. Transitions are measured at 50%.
80%
Figure 2. Fixed-Data Rate Mode, Transmit Side Timing Diagram
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