參數(shù)資料
型號(hào)： MAX4817ETE
廠(chǎng)商： MAXIM INTEGRATED PRODUCTS INC
元件分類(lèi)： 運(yùn)動(dòng)控制電子
英文描述： High-Bandwidth, T1/E1, SPST Analog Switches
中文描述： QUAD 1-CHANNEL, SGL POLE SGL THROW SWITCH, PQCC16
封裝： 5 X 5 MM, 0.80 MM HEIGHT, MO-220WHHB, TQFN-16
文件頁(yè)數(shù)： 9/17頁(yè)
文件大小： 1017K
代理商： MAX4817ETE
Detailed Description
The MAX4815/MAX4816/MAX4817 are high-bandwidth,
low-on-resistance, quad-SPST analog switches targeted
to serve as integrated T1/E1 analog protection switches
for 1+1 and N+1 line-card redundancy applications.
These devices are designed to replace electromechani-
cal relays to save board space, reduce power consump-
tion, and simplify PC board routing. The devices allow
the user to live insert the boards with no adverse effects.
The MAX4815/MAX4816/MAX4817 support ±3.3V or
±5V dual-supply operation, which is required for E1/T1
signal switching in the line-side of the interface trans-
former. Internal voltage multipliers supply the switches
yielding excellent linearity and low on-resistance, typi-
cally 3.7
Ω
, within the E1/T1 analog signal range. This
high-bandwidth, typically 550MHz, family of devices is
optimized for low return loss and matched pulse tem-
plate performance in E1/T1 short-haul and long-haul
applications.
Analog Signal Levels
The on-resistance of the MAX4815/MAX4816/MAX4817 is
very low and stable as the analog signals are swept from
V- to V+ (see the
Typical Operating Characteristics
).
Fault Protection
The fault protection of the MAX4815/MAX4816/
MAX4817 allows the devices to handle input signals of
more than twice the supply voltage without clamping
the signal, latching up, or disturbing other cards in the
system. The device detects when the input voltage
drops below the negative supply. As soon as a fault
condition is detected, the switch is immediately turned
off for 128 clock cycles (typically 128μs). At the end of
the 128μs timeout, the switch is turned back on for one
clock cycle. At the end of the one clock cycle, if the sig-
nal is within the operating range, the switch will remain
on. Otherwise, the device will turn the switch off again
for 128 clock cycles. This will repeat until the signal is
within the operating range. In T1/E1 redundancy appli-
cations, this can happen when the load resistor (R
L
) is
removed or disconnected for any reason, as shown in
Figure 1. Without a load resistor, the output voltage
when using a 1:2 transformer can be as high as ±11V.
Hot Insertion
The MAX4815/MAX4816/MAX4817 tolerate hot inser-
tions, thus are not damaged when inserted into a live
backplane. Competing devices can exhibit low imped-
ance when plugged into a live backplane that can
cause high power dissipation leading to damage of the
device itself. The MAX4815/MAX4816/MAX4817 have
relatively high input impedance when V+ and V- are
unconnected or connected to GND. Therefore, the
devices are not destroyed by a hot insertion. In order to
guarantee data integrity, the V+ and V- supplies must
be properly biased.
Applications Information
T1/E1 N+1 Redundancy
The MAX4815/MAX4816/MAX4817 are designed for
adjacent line-card protection applications. Figures 6 and
7 show a basic architecture for twisted-pair interface
(120
Ω
E1, or 100
Ω
T1). Coaxial cable interface (75
Ω
E1)
can be illustrated with the same figures but without the
single-ended-to-differential conversion stage. A single
protection card can replace up to N line cards in a N+1
redundancy scheme. Figure 6 shows the MAX4815/
MAX4816/MAX4817 sitting in the line cards where they
can reroute any of the input/output signals to a protection
line card. Figure 7 shows the MAX4815/MAX4816/
MAX4817 sitting in a protection-switching card where the
switches are always powered. These figures do not show
the surge protection elements and resistors for line termi-
nation/impedance matching.
The low on-resistance and high bandwidth of the
MAX4815/MAX4816/MAX4817 yield good pulse tem-
plate and return-loss performance (see the
Typical
Operating Characteristics
). The pulse template tests for
E1 (twisted pair interface 120
Ω
and coaxial interface
75
Ω
) and T1 (twisted pair interface 100
Ω
) were tested
using the Dallas DS2155 single-chip transceiver evalu-
ation board, and twelve switches in parallel with one
switch closed and the other eleven open. The internal
transmit termination feature must be disabled when
using this circuit. To use the same transmit resistors for
E1 twisted pair and coaxial cables, the transmit line
build out control register (TLBC) is set to the value 6Ah.
This sets the driver voltage so the output pulse has the
right amplitude for both 120
Ω
(twisted pair) and 75
Ω
(coaxial) loads. The analog switches were powered
with dual power supplies at ±5V.
M
High-Bandwidth, T1/E1, SPST Analog Switches
_______________________________________________________________________________________
9
MAX4815
MAX4816
MAX4817
5V
±
10%
LIU
Tx
TRING
TTIP
10V
±
10%
1:2
+
Vo
-
R
L
NC_
COM_
Figure 1. Fault Protection
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
MAX4817ETE+ 功能描述:模擬開(kāi)關(guān) IC T1/E1 SPST Analog Switch RoHS:否 制造商:Texas Instruments 開(kāi)關(guān)數(shù)量:2 開(kāi)關(guān)配置:SPDT 開(kāi)啟電阻（最大值）:0.1 Ohms 切換電壓（最大）: 開(kāi)啟時(shí)間（最大值）: 關(guān)閉時(shí)間（最大值）: 工作電源電壓:2.7 V to 4.5 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:DSBGA-16
MAX4817ETE+T 功能描述:模擬開(kāi)關(guān) IC T1/E1 SPST Analog Switch RoHS:否 制造商:Texas Instruments 開(kāi)關(guān)數(shù)量:2 開(kāi)關(guān)配置:SPDT 開(kāi)啟電阻（最大值）:0.1 Ohms 切換電壓（最大）: 開(kāi)啟時(shí)間（最大值）: 關(guān)閉時(shí)間（最大值）: 工作電源電壓:2.7 V to 4.5 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:DSBGA-16
MAX4817ETE-T 功能描述:模擬開(kāi)關(guān) IC RoHS:否 制造商:Texas Instruments 開(kāi)關(guān)數(shù)量:2 開(kāi)關(guān)配置:SPDT 開(kāi)啟電阻（最大值）:0.1 Ohms 切換電壓（最大）: 開(kāi)啟時(shí)間（最大值）: 關(guān)閉時(shí)間（最大值）: 工作電源電壓:2.7 V to 4.5 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:DSBGA-16
MAX4817EUE 功能描述:模擬開(kāi)關(guān) IC RoHS:否 制造商:Texas Instruments 開(kāi)關(guān)數(shù)量:2 開(kāi)關(guān)配置:SPDT 開(kāi)啟電阻（最大值）:0.1 Ohms 切換電壓（最大）: 開(kāi)啟時(shí)間（最大值）: 關(guān)閉時(shí)間（最大值）: 工作電源電壓:2.7 V to 4.5 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:DSBGA-16
MAX4817EUE+ 功能描述:模擬開(kāi)關(guān) IC RoHS:否 制造商:Texas Instruments 開(kāi)關(guān)數(shù)量:2 開(kāi)關(guān)配置:SPDT 開(kāi)啟電阻（最大值）:0.1 Ohms 切換電壓（最大）: 開(kāi)啟時(shí)間（最大值）: 關(guān)閉時(shí)間（最大值）: 工作電源電壓:2.7 V to 4.5 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:DSBGA-16
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