CH1786NH 데이터 시트보기 (PDF) - Cermetek Microelectronics

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CH1786NH

CH1786 Family of Ultra Small 2400bps Modems

Cermetek Microelectronics 

Cermetek Microelectronics, Inc.

2. The circuitry from the CH1786 to the telephone

line interface must be provided in wiring that

carries no other circuitry other than that

specifically allowed in the FCC rules (such as A

and A1 leads).

3. Connection to phone line should be made

through an RJ-11C jack.

4. PCB traces from the modem’s RING and TIP pins

to the RJ-11C jack must be 0.1 inch spacing or

greater to one another and 0.2 inch spacing or

greater to all other traces. The traces should

have a nominal width of 0.020 inches or greater.

5. The RING and TIP PCB traces should be as

short as possible and oriented to prevent

coupling other high speed or high frequency

signals present on the host circuit PCB.

6. No additional circuitry other than that shown in

Figure 7A or 7B may be connected between the

modem module and the RJ-11C jack. Doing so

will invalidate the FCC approval.

7. The CH1786LC, CH1786LCNE, and CH1786NH

(only) requires external surge protection (see

Figure 7B). This is mandatory to maintain FCC

Part 68 conveyed approval.

8. The CH1786, the RJ-11C jack, the interfacing

circuitry and all PCB traces in between, must be

contained on a PCB with a 94 V-0 flammability

rating.

9. The supplied FCC registration label must be

applied visibly on the outside of the product.

10. The product’s User Manual must provide the user

with instructions for connection and use as

recommended in the FCC Registration Section

below.

CH1786 Family of Ultra Small 2400bps Modems

CH1786 HANDLING AND ASSEMBLY

RECOMMENDATIONS

The CH1786 contains static-sensitive components

and should only be handled by personnel and in

areas that are properly protected against static

discharge. The two recommended mounting

techniques for physically connecting the CH1786 to a

PCB are discussed below.

Direct Soldering. The CH1786 may be wave

soldered. All CH1786 products are hermetically

sealed (except the CH1786LCNE, CH1786NE, and

CH1786NH) and will not be harmed by industry

standard wave soldering processes. Cermetek

recommends against exposing the non-hermetic

CH1786LCNE, CH1786NE, and CH1786NH to

aqueous based rinsing processes.

Socketing. The socketing approach to mounting

eliminates cleaning and desoldering concerns. When

the socket is used, it must make a solid connection to

all pins. Failure to do so will cause unreliable or

intermittent operation. Also, steps should be taken to

assure that the module remains tightly seated in the

socket during shipping. Cermetek recommends using

sockets from Samtec. See Application Note # 130,

Summary of Recommended Suppliers.

FCC REGISTRATION

All products in the CH1786 family are registered with

the FCC (Federal Communications Commission)

under Part 68. To maintain the validity of the

registration, you must serve notice to the end user of

the products of several restrictions the FCC places on

the modem and its use.

In addition to restriction notification, the FCC requires

that Cermetek make all repairs to all products in the

CH1786 family. If repairs are necessary after

installation of the CH1786 in the end product and the

end product has been delivered to the end user, the

end product must be returned to the end product

supplier where the CH1786 can be removed and then

forward to Cermetek for repair. The following notice

is recommended and should be included in the end

product’s user manual.

Figure 6. Speaker Control Circuit: Optional to

allow for call progress monitoring.

2003 Cermetek Microelectronics, Inc.

FOR YOUR USER’S MANUAL

The FCC Part 68 rules require the following (or

equivalent) be provided to the end user of equipment

containing a DAA.

Type of Service. The (insert end product name) is

designed to be used on standard device telephone

lines. It connects tot he telephone line by means of a

standard jack called the USOC RJ-11C (or USOC

RJ45S). Connection to telephone-company-provided

coin service (central office implemented systems) is

Page 11

Document No. 607-0004 Revision L1 (06/03)

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