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| 型號： | 73K224BL-IH |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | Single-Chip Modem w/ Integrated Hybrid |
| 中文描述： | 單芯片調(diào)制解調(diào)器瓦特/集成混合 |
| 文件頁數(shù)： | 29/33頁 |
| 文件大小： | 237K |
| 代理商： | 73K224BL-IH |
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73K224BL
V.22bis/V.22/V.21/Bell 212A/103
Single-Chip Modem w/ Integrated Hybrid
29
APPLICATIONS INFORMATION
(continued)
DIRECT ACCESS ARRANGEMENT (DAA)
The DAA (Direct Access Arrangement) required
for the 73K224BL consists of an impedance
matching resistor, telecom coupling transformer,
and ring detection and fault protection circuitry.
The transformer specifications must comply with
the impedance of the country in which the modem
is
being
operated.
Transformers
specifically for use with the telephone network
should be used. These may present a DC load to
the network themselves (a “wet” transformer) or
they may require AC coupling with a DC load
provided
by
additional
transformer). A dry transformer will generally
provide higher performance and smaller size than
a wet transformer. A wet transformer allows a
simpler design, but must not saturate with the
worst case DC current passing through it or
distortion and poor performance will result.
designed
devices
(a
“dry”
The protection circuitry typically consists of a
transient suppression device and current limiter to
protect the user and the telephone network from
hazardous voltages that can be present under
fault conditions. The transient suppresser may be
a MOV (metal oxide varistor), Sidactor
(Teccor
Electronics Inc.), spark gap device, or avalanche
diode. Some devices clamp the transient to their
specified break down voltage and others go into
low impedance crowbar state. The latter require
that the fault current cease before they can return
to their inactive state.
Current limiting devices can consist of a resistor,
Raychem PolySwitch
resettable fuse, or slow
blow fuse that can withstand the transient tests
without permanent damage or replacement.
Ring detection circuitry is not required by the FCC,
but may be required by the application. The ring
detector usually consists of an optoisolator,
capacitor, and resistor to present the proper AC
load to the network to meet the REN (Ring
Equivalency Number) regulations of FCC Part 68.
The K-Series Design Manual contains detailed
information on the design of a ring detect circuits
as well as the other topics concerning the DAA.
DESIGN CONSIDERATIONS
Semiconductor's
include all basic modem functions. This makes
these devices adaptable for use in a variety of
applications,
and
as
conventional digital bus peripherals.
one-chip
modem
products
easy
to
control
as
Unlike digital logic circuitry, modem designs must
properly
contend
with
tolerances and very low level analog signals, to
ensure acceptable performance. Using good
analog circuit design practices will generally result
in a sound design. Following are additional
recommendations which should be taken into
consideration when starting new designs.
precise
frequency
CRYSTAL OSCILLATOR
The K-Series crystal oscillator requires a parallel
mode (anti-resonant) crystal which operates at
11.0592 MHz. It is important that this frequency be
maintained to within ±0.01% accuracy.
In order for a parallel mode crystal to operate
correctly and to specification, it must have a
capacitor connected to the junction of each of the
crystal
and
internal
terminated to ground. The values of these
capacitors depend primarily on the crystal’s
characteristics, and to a lesser degree on the
internal inverter circuit. The values used affect the
accuracy and start up characteristics of the
oscillator.
inverter
connections,
LAYOUT CONSIDERATIONS
Good analog/digital design rules must be used to
control system noise in order to obtain highest
performance in modem designs. The more digital
circuitry present on the PC board, the more this
attention to noise control is needed. The modem
should be treated as a high performance analog
device. A 22 μF electrolytic capacitor in parallel
with a 0.1 μF ceramic capacitor between VDD and
GND is recommended. Liberal use of ground
planes and larger traces on power and ground are
also highly favored. High speed digital circuits tend
to generate a significant amount of EMI (Electro-
Magnetic Interference) which must be minimized
in order to meet regulatory agency limitations. To
accomplish this, high speed digital devices should
be locally bypassed, and the telephone line
interface and K-Series device should be located
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| 73K324BL | Single-Chip Modem w/Integrated Hybrid |
| 73K324BL-IGT | CONN, SHROUDED HDR, 34PIN, MALE, 0.100 |
| 73K324BL-IH | Four Wall Header; No. of Contacts:34; Pitch Spacing:0.1"; No. of Rows:2; Gender:Header; Body Material:Glass-filled Polyester; Contact Plating:Nickel; Leaded Process Compatible:No; Mounting Type:Through Hole RoHS Compliant: No |
| 73K324L | EMBASE |
| 73K324L-28IH | COSSE |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| 73K224BL-IH/F | 功能描述:電信集成電路 Modem Data Pump With Hybrid Relay Driver RoHS:否 制造商:STMicroelectronics 類型:Telecom IC - Various 工作電源電壓:4.75 V to 5.25 V 電源電流: 工作溫度范圍:- 40 C to + 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PQFP-100 封裝:Tray |
| 73K224BL-IHR/F | 功能描述:電信集成電路 Modem Data Pump With Hybrid Relay Driver RoHS:否 制造商:STMicroelectronics 類型:Telecom IC - Various 工作電源電壓:4.75 V to 5.25 V 電源電流: 工作溫度范圍:- 40 C to + 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PQFP-100 封裝:Tray |
| 73K224L | 制造商:TERIDIAN 制造商全稱:TERIDIAN 功能描述:Single-Chip Modem |
| 73K224L-28IH | 制造商:TDK 制造商全稱:TDK Electronics 功能描述:V.22bis/V.22/V.21/ Bell 212A/Bell 103 Single-Chip Modem |
| 73K224L-28IH/F | 制造商:Maxim Integrated Products 功能描述: |
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