uba2051t NXP Semiconductors, uba2051t Datasheet - Page 22

• Manufacturer Part Number: uba2051t
• Description: Uba2050 A ; Uba2051 A;c One-chip Telephone Ics With Speech, Dialler And Ringer Functions
• Manufacturer: NXP Semiconductors

Philips Semiconductors
Table 4 DTMF standard frequencies and their implementation
Note
1. Assuming f
F
Pressing the flash function key [R] results in a calibrated
pulse which drives the electronic line current interrupter via
pin DP/FL. The DMO output is also activated during pulse
production (see Fig.23). After a flash pulse, an interflash
pause time t
supply for the dialler part.
2000 May 19
handbook, full pagewidth
LASH FUNCTION
DTMF FREQUENCY (Hz)
One-chip telephone ICs with speech,
dialler and ringer functions
(1) pin DMO available only on UBA205x.
t
t
t
fl
fho
ifp
= flash time.
= interflash pause time.
= flash holdover time.
1209
1336
1477
ifp
697
770
852
941
of 800 ms is inserted to recover the power
xtal
(
PINS
= 3.579545 MHz.
DP/FL
DMO
internal
AND
MUTE
DP/FL
KEYS
(1)
DMO)
MDY/TONE (Hz)
FREQUENCY AT
[R]
1206.45
1341.66
1482.21
697.90
770.46
850.45
943.23
............................
t fho
t fl
Fig.23 Flash timing diagram.
(1)
[R]
..........................
t ifp
22
The duration of the flash time depends on the resistor
options FTSA and FTSB (see Fig.25 and Table 7).
During t
DEVIATION (%)
t fho
t fl
fl
+ t
0.13
0.06
0.24
0.42
0.35
0.18
0.21
UBA2050(A); UBA2051(A;C)
fho
, the reset delay time is inhibited.
t ifp
MGU142
DEVIATION (Hz)
Product specification
0.90
0.46
2.23
5.66
5.21
1.55
2.55