UPDATE.OCT–RP
DSP-based chipset for personal communications
The SQ3214 modem chipset combines V.32/V.32bis data modes with low-speed
data and voice capability, V.17 and V.29 Group 3 fax modes, as well as
Caller ID, MNP 2-5, and V.42/V.42bis features into four chips. When
integrated into a PC environment, the chipset enables the transmission of
voice, fax, and data with the ability to detect dual-tone multifrequency
tones during voice message transmission. The SQ3214 comprises four basic
chips: the SC11297 analog front end; the SC11083 logic and interface
devices; the SC11091 controller; and the SC23M03 DSP chip. The DSP and
controller firmware is stored in ROMs and SRAMs. The chipset is available in
PLCCs and plastic QFPs. ($93 ea/10,000–available now.) Sierra Semiconductor
Corp. San Jose, CA Fred Kamp 408-263-9300 Fax 408-263-3337
IC allows multimedia communications
The YTM403–or Fax VOdem–combines fax, data, ADPCM voice, and Caller ID
capabilities on a single chip. It provides voice quality with resolution to
16 bits at 9,600 bits/s and dynamic range to 72 dB. In addition, its
built-in voice record and playback includes ADPCM providing a 16-to-4 bit,
three-to-one compression and decompression ratio. The Fax VOdem is capable
of transmitting and receiving at 9,600 bits/s and uses 300 mW in active
mode; in power-down mode, it uses less than 1 mW. The YTM403's controller
chip, the GTM407, runs accompanying firmware. The firmware includes
V.42bis/V.42 features, auto-bauding capabilities to 38.4 kbits/s, and
high-speed serial voice communications. The YTM403 Fax VOdem is available in
64-pin shrink DIPs, QFPs, or PLCCs. ($40 ea/1,000–available now.) Yamaha
Corp. Systems Technology Div. San Jose, CA Robert Starr 800-543-7547 Fax
408-437-8791
Low-power modems support worldwide protocols
A low-power family of V.32/V.32bis modem devices supports data, fax, and
voice functions. The family comprises the RC96DPL/144DPL modem data
pumps–which support data rates to 9,600 and 14,400 bits/s, respectively,
and 14,400 bits/s send/receive Group 3 fax–and the RC96ACL/144ACL
integrated modem solutions, which come with controller firmware. The
RC96DPL/144DPL consume 390 mW typ, and 10 mW in sleep mode; the RC96ACL
consumes less than 500 mW. The ACL devices incorporate enhanced AT commands,
facsimile communications-software commands, and MNP 10. The DPL products
come in single 68-pin PLCCs or a set consisting of 80- and 100-pin plastic
QFPs. (The RC96DPL/144DPL and RC96ACL/144ACL cost $83, $98, $98, and $113
ea/10,000, respectively–available now.) Rockwell International Corp.
Newport Beach, CA Information 800-854-8099 Fax 714-833-6399
DTMF receiver IC uses little power
The BU8874/BU8878F is a CMOS dual-tone multifrequency (DTMF) receiver. The
device has a 45-dB dynamic input range, a power-down mode, a serial 4-bit
binary data output, and hysteresis on the ACK input pin. The BU8874/BU8874F
typically operates at a supply current of 2.2 mA with a 5-V supply voltage
and has a standby current of 0.1 mA. It is available in 8-pin DIPs and
18-pin SOIC packages. Maximum power dissipation is 500 (DIP) or 550 mW
(SOIC). ($0.99 ea/10,000–12 weeks ARO.) ROHM Corp., Antioch, TN Warren
Schoals 615-641-2020 Fax 615-641-2022
Communications chipsets offer high performance at low cost
The two-chip PHY1001/2 offer full fax/modem/voice and Caller ID functions.
They also feature HDLC UART/USART, Caller ID receiver, DTMF receiver, and
ADPCM voice compression. Operating at speeds of up to 14,400 bits/s for
V.32bis data and V.17 fax, the chipsets will be made compatible to the new
V.Fast standard, once ratified by the CCITT. The PHY1001 comprises the
PHY202 front end and the PHY105 digital signal processor. The PHY1002 has
the same front end, but uses the PHY101 for a digital signal processor. With
its associated EPROM and SRAM, the PHY1002 consumes only 450 mW typ and 80
mW in sleep mode. The PHY1001 is available in two 68-lead PLCCs or in a
module format. The PHY1002 comes in two QFPs–one 64 lead and one 80 lead.
(The PHY1001/2 cost $40 and $50 ea/1,000, respectively -available now.)
Phylon, Inc., Fremont, CA Sid Bagwe 510-656-2606 Fax 510-656-0902
3130
Mixer FM IF ICs offer high-speed RSSI
The NE/SA624/5/7 mixer FM IF circuits have received-signal-strength
indicator (RSSI) rise and fall times of 0.9 and 1.4 microsecond,
respectively, at a 10.7-MHz input frequency. The devices incorporate two
limiting IF amps, a quadrature detector, muting, fast logarithmic RSSI, and
a voltage regulator. In addition to the above features, the NE/SA625/7 have
a mixer/oscillator that accommodates input signals up to 500 MHz. The
NE/SA627 also offers an additional limiter output. The NE/SA624 and
NE/SA625/7 use 3.4 and 5.8 mA, respectively, at 6 V. The devices come in 16-
(NE/SA624) and 20-lead (NE/SA625/7) DIPs and SO packages. (The NE/SA624 and
NE/SA625/7 cost from $2.84 and $3.55 ea/100, respectively -available now.)
Signetics Co., Sunnyvale, CA Michael Sera 408-991-4544
Compact modem module operates from 300 to 9,600 bits/s
The TS75C32DP modem data-pump module offers all the functions necessary for
multistandard modems transmitting from 300 to 9,600 bits/s. All of the main
CCITT recommendations–V.21, V.22, V.23, V.22bis, V.32–and Bell standards
are satisfied in a board area of about 4 x 2 in. The module includes three
preprogrammed CMOS digital signal processors, three modem analog front end
devices, and a serial/parallel sync/async converter. Additional features
include programmable filters, DTMF dialing, and power consumption of 1 W.
The TS75C32DP operates in all phone network conditions and can cope with
near- and far-end echo, covering up to two satellite hops, even with a
frequency offset up to 10 Hz. ($95 ea/large qty–available now.) SGS-Thomson
Microelectronics, Inc. Phoenix, AZ John Vey 214-466-7276 Fax 602-867-6290
DAA micromodule provides V.32bis interface
The 73M9001 data access arrangement (DAA) micromodule provides electrical
interface and isolation for connection of high-performance analog modem
designs to the public telephone network at rates up to 14,400 bits/s. The
1-in.
phone line. The 73M9001 includes solid-state loop closure relay and
additional relay drivers; a 400-mW audio amplifier with digitally selectable
gain; receive and transmit signal prefiltering and 2-to-4 wire conversion;
ringing signal isolation and predetection; and signal amplification and
drivers for both inward and outward directions. Caller identification
capability is also included. (About $14 ea/10,000–available now.) Silicon
Systems, Tustin, CA Information 800-624-8999, ext. 151 Fax 714-573-6914 EEM
FILE 3130
Modem device set for portable computers
The two-chip CL-MD9624 intelligent data/fax/voice modem device set is
capable of transmitting and receiving data at up to 2,400 bits/s and fax
information at up to 9,600 bits/s. The chipset incorporates a serial or
parallel interface, 16550A register-compatible UART, and internal controller
functions, as well as on-chip communications firmware and sigma-delta
technology. An evaluation board for testing the CL-MD9624 accommodates the
two standard configurations of the product: the CL-MD9624AT two-chip set and
the CL-MD9624EC three-chip solution, which includes a V.42/MNP protocol
chip. The CL-MD9624's digital signal processor and front end are packaged in
a 100-pin QFP and 28-pin PLCC, respectively. The V.42/MNP chip comes in a
44-pin PLCC. (The two- and three-chip set cost $25 and $30 ea/5,000,
respectively -samples available now.) Cirrus Logic, Inc., Fremont, CA Joe
Fowler 510-226-2239 Fax 510-226-2270
Data/fax modem chipset includes MNP 4/5 and V.42/V.42bis
The 89C124FX modem chip set integrates fax and data functionality with error
correction and data compression into two chips. It allows users to build a
high-performance data/fax modem that occupies only three square inches of
board space and consumes only 7 mW in power-down mode. The 89C124FX sends
and receives facsimiles at 9,600 and 4,800 bits/s. In addition, it functions
as a V.22bis 2,400-bit/s modem. It also supports V.42 and MNP 4 error
correction, as well as V.42bis and MNP 5 data compression. A common board
can be developed for use with the company's 89C024LT/FT data modem chips.
The chipset's microcontroller is available in a 68-lead PLCC; its analog
front end comes in a 28-lead PLCC or plastic DIP. ($29.85
ea/1,000–available now.) Intel Corp., Santa Clara, CA Information (IP-88)
800-548-4725
Telephone line interface conforms to worldwide requirements
The XE1000 is offered as the first universal telephone line interface
module. It adapts to the various worldwide PTT requirements through the use
of external jumpers and/or components. The XE1000 satisfies applications
including live or synthesized voice, fax modems, touch-tone signaling, and
data modems, including V.32. The device typically uses 2 mA from a +5-V
supply and measures 1.25 (L) x 1.0 (W) x 0.40 (H) in. ($29
ea/10,000–available now.) XECOM, Inc., Milpitas, CA Steve Clary
408-945-6640 Fax 408-942-1346
ICs for cellular telephone applications
A line of ICs handles the complete process of receiving and transmitting
voice and data signals in cellular radio and telephone applications. The
devices include five FM IF amps; two cellular radio telephone modem LSI
circuits and three associated filter ICs; a frequency synthesizer and a two
modulus prescaler IC; and two RF amps and two mixers, which are GaAs
n-channel MESFET devices. The FM IF amps come in 16- and 24-pin SOPs and
VSOPs; the modem and filter ICs are, respectively, available in 48- and
64-pin QFPs and VQFPs; the synthesizer and prescaler ICs are, respectively,
packaged in 16- and 8-pin SOPs and VSOPs; and the GaAs ICs are available in
mini mold packaging. (From $0.60 (GaAs ICs) to $10 ea/10,000 (Filter
IC)–available now.) Sony Corp. of America, Cypress, CA Information
800-288-SONY Fax 714-229-4333
Modem chipset fits in 1.5-in.
The V.32lite complete modem chipset for V.32 PCMCIA-card modems supports the
AT command set, data compression, error control, and send/receive fax. The
chipset comprises the LMC-10 laptop modem controller, the DSP16A-V.32
digital signal processor, the V32INTFC IC, and the T7525 Codec chip. The
LMC-10 chip incorporates all error-correction and data-compression features
specified under CCITT V.42/V.42bis and the MNP 4/5 standards. All four chips
fit into a 1.5-in.
PCMCIA V.32 modem–including transformer and additional discretes–is less
than 1 W typ. The LMC-10, DSP16A-V.32, and V32INTFC are housed in 100-pin
SQFPs; the T7525 comes in a 28-pin SOTG package. ($109 per
set/10,000–available now.) AT&T Microelectronics Allentown, PA Information
800-372-2447, ext. 841 Fax 215-778-4106
Hardware/software building blocks for modems
The AD20msp500/501/502 chipsets provide the key building blocks for a
variety of modems and data pumps. The AD20msp500 chipset, which is the
hardware core of the modem or data pump solution, consists of a PSTN signal
port chip and an ADSP-2100-family compatible programmable signal processor.
It is intended for users who wish to use algorithms other than those
provided by the company. The AD20msp501/502 product sets use data pump
algorithms licensed from Digicom Systems. Both support CCITT standards V.32,
V.22bis, V.22, Bell 212A, and Bell 103. The AD20msp502 adds V.32bis plus fax
standards V.17, V.29, V.27ter, and V.21. A data pump algorithm toolkit is
available for use with the AD20msp501/2 products. (The AD20msp500/501/502
chipsets are $19, $25, and $30 ea/large qty, respectively -available now.)
Analog Devices, Inc., Norwood, MA Larry Gerstner 617-461-3752
Modem chipset is optimized for PC office environment
The two-chip XR-29V00 provides the complete data pump function for Group 3
9,600-bit/s fax, 2,400-bit/s data, voice with 4: 1 compression, and Caller
ID operation. The product's 4: 1 compression was selected for optimum
operation in a Windows environment. The XR-29V00 supports all domestic and
international communication specifications for worldwide communications, as
well as CCITT V.42 error control plus MNP 5 and V.42bis data compression.
The chipset comprises the XR-29V01 digital signal processor and the XR-29P02
combination analog and digital chip. Both chips are available in 52-pin
PLCCs, 52-pin QFPs, or 64-pin SQFPs. ($26.89 ea/1,000–available now.) EXAR
Corp., San Jose, CA Alan Zoraster 408-434-6400 Fax 408-943-8245
Full-duplex scrambler IC for cordless phones
The MX118 is a full-duplex frequency-inversion scrambler for use in cordless
phones and wireless PBXs. It includes two separate audio paths, each
consisting of a tenth-order 3.1-kHz low-pass filter, a balanced modulator, a
3.3-kHz inversion carrier, a fourteenth-order 300 to 3,000-Hz band-pass
filter, and input op amps with externally adjustable gain. The MX118
operates from a 3.0 to 5.5-V supply and comes in 16-pin plastic DIPs and SO
packages. (From $2.77 ea/1,000–available now.) MX-COM, Winston-Salem, NC
Information 800-638-5577 Fax 919-744-5054
Modem module offers full data/fax features
The XE9624E is a full-featured modem module that offers 2,400-bit/s data
operation and up to 9,600-bit/s Group 3 fax operation. Data transfer
features include MNP or V.42 error control and MNP 5 or V.42bis data
compression. The XE9624E's serial interface follows EIA-232-D signal
definitions for compatibility with any UART. In addition, the device comes
with FCC Part 68 registration. The XE9624E measures 2.28 (L) x 1.08 (W) x
0.42 (H) in. and uses 650 mW during typical operation. An automatic sleep
mode reduces power consumption to 50 mW. ($109 ea/10,000–available now.)
XECOM, Inc., Milpitas, CA Information 408-945-6640 Fax 408-942-1346
3130
Chipset for digital telephone-answering systems
The Telephone Answering Device (TAD) chipset provides the core functionality
for digital telephone-answering systems. It includes algorithms to perform
low-bit-rate high-quality speech coding, near-end echo cancellation, and
acoustic echo cancellation for speakerphone operation. The chipset comprises
a ROM-coded DSP16A1, a T7513B 8-bit μ-law coder/decoder, and an ASIC. It
provides speech compression, telecommunications signaling, memory
management, and remote operation via DTMF control. In addition, with an
external ROM, the product supports voice commands for user prompts and
time/day information. The TAD chipset typically consumes 85 mW. A
development kit is available. (TAD chipset, $16.95 ea/100,000; development
kit, $1,990 each–available now.) AT&T Microelectronics Allentown, PA
Information 800-372-2447, ext. 844 Fax 215-778-4106
ICs simplify audio interface to cellular telephones
The TCM320AC3X voice-band audio processors (VBAPs) allow designers to
simplify the audio interface to cellular telephones. The single-chip devices
integrate the encoding, decoding, filtering, signal conditioning, impedance
matching, and interface timing functions necessary to transport audio
signals to and from the digital signal processor. The VBAPs operate in
either 13-bit linear or 8-bit companded modes; volume control is provided in
the linear mode for in-cellular telephone applications. The devices are
compatible with the EIA/TIA/IS-54 specification for U.S. digital cellular
telephones as well as the CCITT G.711 and G.712 μ-law and A-law
companding and filtering requirements. Power dissipation is less than 40 mW
typ from a single 5-V supply. (From $4.20 ea/1,000–available now.) Texas
Instruments, Inc., Dallas, TX Semiconductor Group (SC-92-078) 214-995-6611,
ext. 3990
ICs for digital wireless communications
The PMB2330 is a 2-GHz double-balanced mixer IC and the PMB2312 is a
prescaler IC with a 1.1-GHz operating range. The devices are designed
specifically for digital cellular telephone applications. The PMB2330 is a
5-V 1.6-mA Gilbert cell mixer with a high-input intercept, a noise figure of
less than 8 dB, and a gain of 10 dB. The PMB2312 prescaler offers divide-by
ratios of 64/65 or 128/129 and uses 5.5 mA typ of supply current and 0.2 mA
in standby mode with no internal oscillation. Both devices are available in
8-pin packages. (PMB2330, $2.50 ea/1,000; PMB2312, $2 ea/1,000–available
now.) Siemens Corp. Integrated Circuits Div. Santa Clara, CA Ramesh Sirsi
408-980-4071
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