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RC224ATL Schematic ( PDF Datasheet ) - ETC

Teilenummer RC224ATL
Beschreibung EmbeddedModem Family
Hersteller ETC
Logo ETC Logo 




Gesamt 30 Seiten
RC224ATL Datasheet, Funktion
RC224ATL/224ATLV
EmbeddedModem Family
The new Conexant RC224ATL utilizes a new integrated data pump/controller to allow
the device to directly connect to host processors that are 3.3 V I/O capable. The codec
used in the new part is the same as the codec used in the existing RC224ATL. The
new device is form, fit, and function compatible with the existing device. This means
there are no hardware and software differences between the existing and the new part,
with one exception. The 3.3 V I/O capable part incorporates 3.3 V compatible digital
I/O buffers, hence requiring 3.3 V digital supply instead of 5 V digital supply.
In addition, unlike the current version of RC224ATL, the new part provides both
data and fax capabilities.
Data modes, controlled by an industry standard 2400 AT command set, can
transmit and receive up to 2400 bps.
Fax modes, controlled by a built-in EIA-578 Class 1 command interface, provide
Group 3 transmit and receive functions.
Functional Block Diagram
Modem
Data Pump
V.24
EIA-232-D
Interface
Modem
Controller
Crystal
Telephone
Line
Interface
Modem
LED
Indictors
Optional
NVRAM
Optional
Speaker
Distinguishing Features
• Data modes
– CCITT V.22 bis (2400 bps), V.22
(1200 bps)
– Bell 212A (1200 bps) and 103
(300 bps)
– Enhanced AT commands
• Group 3 fax modes
– V.29 (9600/7200 bps) transmit
– V.27 ter (4800/2400 bps)
transmit and receive
– V.21 Channel 2 (300 bps)
transmit and receive
• EIA-578 Service Class 1 commands
• V.42/MNP2-4 and V.42 bis/MNP 5
can be supported through host
software without additional hardware
• Data/fax discriminator and auto
answering
• Communications software
compatible
• Integrated call progress and dialing
• No external microcomputer or
memory required
• Parallel or serial asynchronous DTE
interface
• A/A1 relay control
• NVRAM interface allows storage of
two user configurations and four
36-digit dial strings
• Automatic adaptive/fixed
compromise equalization
• Programmable sleep mode and
wake-up
• Full-duplex data mode test
capabilities: Analog loop, local digital
loop, and remote digital loop
• Half-duplex fax mode test capabilities
• Automatic format/speed sensing
• Low power consumption (typical)
– Operating: 100 mW
– Sleep—Idle: 25 mW
– Sleep—Stop: 5 mW
• Single +5 V power supply or Dual
+ 3.3 VDD and + 5 VAA power
supplies
• Package options:
– 68-pin plastic leaded chip carrier
(PLCC)
– 100-pin plastic quad flat pack
(PQFP)
Data Sheet
D224ATLVDSC
March 25, 1999






RC224ATL Datasheet, Funktion
List of Figures
RC224ATL/224ATLV
EmbeddedModem Family
vi
Conexant
D224ATLVDSC

6 Page









RC224ATL pdf, datenblatt
1.0 Functional Description
1.2 Technical Specifications
RC224ATL/224ATLV
EmbeddedModem Family
1.2.8 Transmit Level
The transmit level is – 10 dBm ± 1 dB (at TIP and RING) and can be obtained
using the circuits shown in Appendix A. Carrier and dual tone multi-frequency
(DTMF) transmit levels can be further attenuated using AT%Ln + AT%Dn
commands, respectively. If a higher transmit level is required, an external op amp
can be added.
1.2.9 Transmit Tones
Answer Tone An answer tone of 2100 Hz (V.22 bis, V.22, or T.30) or 2225 Hz (Bell 212A or
103) is generated.
Guard Tone An 1800 Hz guard tone can be generated in all data modes.
Calling Tone An 1100 Hz (0.5 seconds on, 3 seconds off) calling tone (T.30) is generated in the
originate fax mode.
1.2.10 Receive Level
The receiver satisfies performance requirements for a received signal from
– 9 dBm to – 43 dBm. The carrier detect is ON at – 43 dBm and OFF at – 48 dBm
with a minimum of 2 dB hysteresis.
1.2.11 Receiver Tracking
DTMF Dialing
Ring Detection
The modem can accommodate carrier frequency offset up to ± 7 Hz, and a
transmit timing error of ± 0.01% (V.22 bis or V.27 ter) or ± 0.02% (V.22 or Bell
212A).
Standard DTMF tones (digits 0-9, A, B, C, D, *, and #) or pulses (digits 0-9) can
be generated. Refer to Table 1-3.
RING signal is detected from valid high to low transitions on the RING input line
at frequencies of 15.3 Hz to 63 Hz. A RING is valid if the RING ON time is
greater than 0.125 seconds and is followed by a RING OFF time greater than 0.5
seconds.
Table 1-3. Dial Digits/Tone Pairs (1 of 2)
Dial Digit
Tone 1
Frequency (Hz)
0 941
1 697
2 697
3 697
4 770
5 770
Tone 2
Frequency (Hz)
1336
1209
1336
1477
1209
1336
1-4
Conexant
D224ATLVDSC

12 Page





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