California Micro Devices CM88L70CPEI, CM88L70CPE, CM88L70CP, CM88L70PEI, CM88L70PE Datasheet

CALIFORNIA MICRO DEVICES

CM88L70/70C

CMOS INTEGRATED DTMF RECEIVER, 3 VOLT VERSION

Features

 2.7 to 3.6 volt operating range
 Full DTMF receiver
 Less than 18mW power consumption
 Industrial temperature range
 Uses quartz crystal or ceramic resonators
 Adjustable acquisition and release times
 18-pin DIP, 20-pin QSOP, 18-pin SOIC,

20-pin PLCC, 20-pin TSSOP

 CM88L70

- Power down mode

- Inhibit mode

- Buffered oscillator output (OSC 3) to
drive other devices

Product Description

The CAMD CM88L70/70C provides full DTMF receiver capability by integrating both the bandsplit filter and digital decoder
functions into a single 18-pin DIP, SOIC, or 20-pin PLCC, TSSOP, or QSOP package. The CM88L70/70C is manufactured using
state-of-the-art CMOS process technology for low power consumption (35mW, max.) and precise data handling. The filter
section uses a switched capacitor technique for both high and low group filters and dial tone rejection. The CM88L70/70C
decoder uses digital counting techniques for the detection and decoding of all 16 DTMF tone pairs into a 4-bit code. This
DTMF receiver minimizes external component count by providing an on-chip differential input amplifier, clock generator, and
a latched three-state interface bus. The on-chip clock generator requires only a low cost TV crystal or ceramic resonator as
an external component.

Applications

 PCMCIA
 Portable TAD
 Mobile radio
 Remote control
 Remote data entry
 Call limiting
 Telephone answering systems
 Paging systems

Block Diagram

© 2000 California Micro Devices Corp. All rights reserved.

6/16/2000

215 Topaz Street, Milpitas, California 95035 Tel: [phone] Fax: [phone] www.calmicro.com

C0451098

1

CALIFORNIA MICRO DEVICES

CM88L70/70C

Absolute Maximum Ratings: (Note 1)

This device contains input protection against
damage due to high static voltages or
electric fields; however, precautions should
be taken to avoid application of voltages
higher than the maximum rating.

Note:

1. Exceeding these ratings may cause
permanent damage, functional
operation under these conditions is not

VSS)

retemaraPlobmySeulaV

-

V(egatloVylppuSrewoP

DD

niPynanoegatloVV

niPynanotnerruCI

erutarepmeTegarotST

V

DD

t

t

S

V

SS

SGNITARMUMIXAMETULOSBA

xaMV0.6

VotV3.0-

V3.0+

DD

xaMAm01

C°051+otC°56-

implied.

DC Characteristics: All voltages referenced to VSS, VDD = 3.0V + 20% / -10%, TA = -40°C to +85°C unless otherwise noted.

SCITSIRETCARAHCCD

retemaraPlobmySniMpyTxaMstinUsnoitidnoCtseT

egatloVylppuSgnitarepOV

tnerruCylppuSgnitarepOI

tnerruCylppuSybdnatSI

DD

DD

SDD

7.20.36.3V V

0.30.5Am

0.501

µA

V=DP

DD

egatloVtupnIleveLwoLVLI0.1V VDDV0.3=

egatloVtupnIleveLhgiHV

tnerruCegakaeLtupnII

EOTnotnerruC)ecruoS(pUlluPI

DPtnerruC)knis(nwodlluPI

HNItnerruC)knis(nwodlluPI

)-NI,+NI(,ecnadepmItupnIR

egatloVdlohserhTgnireetSV

egatloVtuptuOleveLwoLV

egatloVtuptuOleveLhgiHV

tnerruC)ecruoS(hgiHtuptuOI

egatloVtuptuO

ecnatsiseRtuptuOR

V

FER

HIL/LI

V

HI

os

DP

HNI

NI

tsT

LO

HO

HO

FER

RO

0.2VV

21-0.2-

1.0

0.154

0.154

µA

µA

µA

µA

VNIV=

SS

V0.3=

DD

Vro

DD

V0=EOT

V0.3=DP

V0.3=NHI

01MΩ zHK1@

5.1V

1.04.0V ILOAm0.1=

4.26.2VI

0.1AmV

TUO

004= µA

HO

V@V5.2=

DD

5.1V daoLoN

01

ΩΚ

)11etoN(

V7.2=

Operating Characteristics: All voltages referenced to VSS, VDD = 3.0V + 20% / -10%, TA = -40°C to +85°C unless otherwise noted.
Gain Setting Amplifier

SCITSIRETCARAHCGNITAREPO

retemaraPlobmySniMpyTxaMstinUsnoitidnoCtseT

tnerruCegakaeLtupnII

ecnatsiseRtupnIR

egatloVtesffOtupnIV

noitcejeRylppuSrewoPRRSP0506Bd)21etoN(zHK1

noitcejeRedoMnommoCRRMC0406BdV<V0.3-

niaGegatloVpooLnepOCDA

gniwSegatloVtuptuOV

)SG(daoLeviticapaCelbareloTCL001Fp

)SG(daoLevitsiseRelbareloTR

©2000 California Micro Devices Corp. All rights reserved.

2

215 Topaz Street, Milpitas, California 95035 Tel: [phone] Fax: [phone] www.calmicro.com

NI

NI

SO

LOV

2356Bd

htdiwdnaBniaGytinUpooLnepOcf3.00.1zHM

O

L

)daoLoN(egnaRedoMnommoCmcV0.55.1V

001AnV

SS

01MΩ

5152Vm

2.2V

P-P

RL≥ K001 Ω Vot

KΩ

P-P

V<

V<

NI

DD

V0.3<

NI

SS

daoLoN

8/16/2000

CALIFORNIA MICRO DEVICES

CM88L70/70C

AC Characteristics: All voltages referenced to V
using test circuit (Fig. 1) unless otherwise noted.

retemaraPlobmySniMpyTxaMstinUsetoN

sleveLlangiStupnIdilaV

)langisetisopmocfoenothcae(

tpeccAtsiwTevitisoP 6Bd

tpeccAtsiwTevitageN 6Bd

timiLtpeccAnoitaiveD.qerF zH2±%5.1.moN01,8,5,3,2

timiLtcejeRnoitaiveD.qerF%5.3±.moN5,3,2

ecnareloTenoTdrihT 61-Bd41,31,9,8,5,4,3,2

ecnareloTesioN21-Bd9,8,6,5,4,3,2

ecnareloTenoTlaiD 22+Bd9,8,7,5,4,3,2

emiTnoitceteDtneserPenoTt

emiTnoitceteDtnesbAenoTt

tpeccAnoitaruDenoTniMt

tcejeRnoitaruDenoTxaMt

tpeccAesuaPtigidretnI.niMt

tcejeResuaPtigidretnI.xaMt

)QottS(yaleDnoitagaporPt

)DtSottS(yaleDnoitagaporPt

)DtSotQ(pUteSataDtuptuOt

elbanEt

)QotEOT(yaleDnoitagaporP

elbasiDt

ycneuqerFkcolC/latsyrCf

)2CSO(tuptuOkcolCeviticapaC

daoL

PD

AD

CER

CER

DI

OD

QP

SPtD

SQtD

ETP

DTP

KLC

C

OL

, VDD=3.0V + 20% / -10%, TA=-40°C to +85°C, f

SS

SCITSIRETCARAHCCA

63-4.6-mBd

3.21073Vm

58 41Sm

5.03 5.8Sm

04Sm

02Sm

04Sm

02

31

8

4.3

002Sn

005Sn

9575.35975.31385.3zHM

03Fp

µS

µS

µS

µS

=3.579545 MHz

CLK

SMR

R

C

8,5,4,3,2,1

otrefeR

margaiDgnimiT

)elbatsujdAresU(

eranwohssemiT

htiwdeniatbo

)1.giFnitiucric

V=EOT

DD

K01= Ω

L

L

Fp05=

Notes:

1. dBm = decibels above or below a reference power
of 1 mW into a 600 ohm load.

2. Digit sequence consists of all 16 DTMF tones.

3. Tone duration = 40mS. Tone pause = 40 mS.

4. Nominal DTMF frequencies are used.

5. Both tones in the composite signal have
an equal amplitude.

6. Bandwidth limited (0 to 3 KHz) Gaussian Noise.

7. The precise dial tone frequencies are
(350 Hz and 440 Hz) ±2%.

8. For an error rate of better than 1 in 10,000

© 2000 California Micro Devices Corp. All rights reserved.

6/16/2000

215 Topaz Street, Milpitas, California 95035 Tel: [phone] Fax: [phone] www.calmicro.com

9. Referenced to lowest level frequency component
in DTMF signal.

10. Minimum signal acceptance level is measured with
specified maximum frequency deviation.

11. Input pins defined as IN+, IN-, and TOE.

12. External voltage source used to bias V

13. This parameter also applies to a third tone injected onto

.

REF

the power supply.

14. Referenced to Figure 1. Input DTMF tone level
at -28 dBm.

3