MT88E43B
Data Sheet
Alerting Signal
Line Reversal
Mark
Ch. seizure
Ring
Data Packet
A/B Wires
A
B
C
D
E
F
G
TRIGout
PWDN
ESt
Note 6
Note 1
Note 2
tDA
tDP
50-150ms
tGP
tREC
tGA
VTGt
St/GT
StD
tABS Note 3
15±1ms
TE DC load
TE AC load
FSKen
CD
<120µµA
20±5ms
< 0.5mA (optional)
Current wetting pulse (see SIN227)
Note 4
Zss (Refer to SIN227)
Note 5
tCP
tCA
A ≥ 100ms
B = 88-110ms
DR
C ≥ 45ms (up to 5sec)
D = 80-262ms
DCLK
E = 45-75ms
F ≤ 2.5sec (typ. 500ms)
G > 200ms
Note: All values obtained
from SIN227 Issue 1
DATA
..101010..
Data
tPD
tPU
OSCout
Figure 17 - Input and Output Timing for BT Caller Display Service (CDS), e.g., CLIP
Notes:
1) The total recognition time is tREC = tGP + tDP, where tGP is the tone present guard time and tDP is the tone present detect time (refer
to section “Dual Tone Detection Guard Time” on page 6 for details). VTGt is the comparator threshold (refer to Figure 4).
2) The total tone absent time is tABS = tGA + tDA, where tGA is the tone absent guard time and tDA is the tone absent detect time (refer to
section “Dual Tone Detection Guard Time” on page 6 for details). VTGt is the comparator threshold (refer to Figure 4).
3) By choosing tGA=15ms, tABS will be 15-25 ms so that the current wetting pulse and AC load can be applied right after the StD falling
edge.
4) SIN227 specifies that the AC and DC loads should be removed between 50-150 ms after the end of the FSK signal, indicated by CD
returning to high. The MT88E43 may also be powered down at this time.
5) FSKen should be set low when FSK is not expected to prevent the FSK demodulator from reacting to other in-band signals such as
speech, tone alert signal and DTMF tones.
6) TRIGout is the ring envelope during ringing.
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