TCM3105DWL, TCM3105JE, TCM3105JL

TCM3105NE, TCM3105NL

FSK MODEM

SCTS019C – NOVEMBER 1985 – REVISED MAY 1994

Copyright

1

POST OFFICE BOX 655303

POST OFFICE BOX 1443

Modem

Specifications

1200 Baud

and 1200 Baud

Transmit and Receive

Transmit and 150 Baud Receive

Transmit/Receive Filtering

Carrier-Fail Output

description

The TCM3105 is a single-chip asynchronous

frequency-shift-keying (FSK) voice-band modem

that uses silicon-gate CMOS technology to

implement a switched-capacitor architecture. It is

pin selectable (TXR1, TXR2, and TRS) for a wide

range of transmit /receive baud rates and is

compatible with the applicable BELL 202 or

CCITT

V23

standards.

Operation

is

fully

reversible, thereby allowing both forward and

backward channels to be used simultaneously.

The transmitter is a programmable frequency synthesizer that provides two output frequencies (on TXA),

representing the marks and spaces of the digital signal present on TXD.

The receive section is responsible for the demodulation of the analog signal appearing at the RXA input and

is based on the principle of frequency-to-voltage conversion. This section contains a group delay equalizer (to

correct phase distortion), automatic gain control, carrier-detect-level adjustment, and bias-distortion

adjustment, thereby optimizing performance and giving the lowest possible bit error rate.

Carrier-detect information is given to the system by means of the carrier-detect circuits, which set a flag on the

CDT output if the level of received in-band energy falls below a value set on the CDL input for a specified

minimum duration.

The TCM3105JE and TCM3105NE are characterized for operation from – 40

°C to 85°C.The TCM3105DWL,

TCM3105JL, and TCM3105NL are characterized for operation from 0

°C to 70°C.

Caution. These devices have limited built-in protection. The leads should be shorted together or the device placed in conductive foam

during storage or handling to prevent electrostatic damage to the MOS gates.

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2

3

4

5

6

7

8

16

15

14

13

12

11

10

9

CLK

CDT

RXA

TRS

NC

RXB

RXD

OSC2

OSC1

TXD

TXR1

TXR2

TXA

CDL

J OR N PACKAGE

(TOP VIEW)

1

2

3

4

5

6

7

8

9

10

11

12

24

23

22

21

20

19

18

17

16

15

14

13

CLK

CDT

NC

RXA

NC

TRS

NC

RXT

NC

RXB

RXD

OSC2

OSC1

TXD

NC

TXR1

NC

NC

TXR2

TXA

NC

CDL

DW PACKAGE

(TOP VIEW)

NC – No internal connection

D package are available taped and reeled. Add the R suffix to

device type (e.g., YCM3105DWLR).

PRODUCTION DATA information is current as of publication date.

Products conform to specifications per the terms of Texas Instruments

standard warranty. Production processing does not necessarily include

testing of all parameters.