TP5088 Datasheet, PDF (1/6 Pages) National Semiconductor (TI) – TP5088 DTMF Generator for Binary Data

October 1991
TP5088 DTMF Generator for Binary Data
General Description
This CMOS device provides low cost tone-dialing capability
in microprocessor-controlled telephone applications 4-bit
binary data is decoded directly without the need for conver-
sion to simulated keyboard inputs required by standard
DTMF generators With the TONE ENABLE input low the
oscillator is inhibited and the device is in a low power idle
mode On the low-to-high transition of TONE ENABLE data
is latched into the device and the selected tone pair from
the standard DTMF frequencies is generated An open-drain
N-channel transistor provides a MUTE output during tone
generation
Features
Y _{Direct microprocessor interface}
Y _{Binary data inputs with latches}
Y _{Generates 16 standard tone pairs}
Y _{On-chip 3 579545 MHz crystal-controlled oscillator}
Y _{Better than 0 64% frequency accuracy}
Y _{High group pre-emphasis}
Y _{Low harmonic distortion}
Y _{MUTE output interfaces to speech network}
Y _{Low power idle mode}
Y _{3 5V – 8V operation}
Block Diagram
Crystal Specification Parallel Resonant 3 579545 MHz R_S s 150X L e 100 mH C₀ e 5 pF C₁ e 0 02 pF
TL H 5004 – 1
C1995 National Semiconductor Corporation TL H 5004
RRD-B30M115 Printed in U S A