TP5088WM ,TP5088 DTMF Generator for Binary DataTP5088DTMFGeneratorforBinaryDataOctober1991TP5088DTMFGeneratorforBinaryDataGeneralDescription
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TP5116AJ ,7 V, monolithic CODECFunctional Description
Approximately 4 its after the rising edge of the XMIT SYNC
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TP5116AJ ,7 V, monolithic CODECBlock Diagram
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I SAMPLE AND “ I
ANALOG MPOT HOLD A/D SAR LOGIC DIGITAL OUTPUT
COMPARATOR ..
TP5116AJ ,7 V, monolithic CODECFeatures
The TP5116A and TP5156A are monolithic PCM CODECs TP5116A--wlaw coding (sign plus magni ..
TP5156AJ ,7 V, monolithic CODECapplications. Precision voltage reference on-chip
Each device contains separate WA and A/D circu ..
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TP5088WM
TP5088 DTMF Generator for Binary Data
TL/H/5004
TP5088
DTMF
Generator
for
Binary
Data
October 1991
TP5088 DTMF Generator for Binary Data
General Description
This CMOS device provideslow cost tone-dialing capability microprocessor-controlled telephone applications. 4-bit
binary datais decoded directly, withoutthe needfor conver-
sionto simulated keyboard inputs requiredby standard
DTMF generators. Withthe TONE ENABLE input low,the
oscillatoris inhibitedandthe deviceisinalow poweridle
mode.Onthe low-to-high transitionof TONE ENABLE, data latchedintothe deviceandthe selected tonepair from
the standard DTMF frequenciesis generated.An open-drain
N-channel transistor providesa MUTE output during tone
generation.
Features Direct microprocessor interface Binary data inputs with latches Generates16 standard tone pairs On-chip 3.579545 MHz crystal-controlled oscillator Better than 0.64% frequency accuracy High group pre-emphasis Low harmonic distortion MUTE output interfacesto speech network Low poweridle mode 3.5V–8V operation
Block Diagram
TL/H/5004–1
*Crystal Specification: Parallel Resonant 3.579545 MHz,RSs 150X,Le100 mH,C0e5pF,C1e0.02pF.
C1995National SemiconductorCorporation RRD-B30M115/PrintedinU.S.A.
