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| 型號： | SP504EB |
| 英文描述： | Evaluation Board Manual |
| 中文描述： | 評估板手冊 |
| 文件頁數(shù)： | 13/31頁 |
| 文件大?。?/td> | 257K |
| 代理商： | SP504EB |
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13
Rev: A Date:1/27/04
SP504 Multi–Mode Serial Transceivers
Copyright 2004 Sipex Corporation
V
CC
= +5V
–5V
–5V
+5V
V
DD
Storage Capacitor
C
1
C
2
C
4
+
+
+
–
–
–
V
SS
Storage Capacitor
C
3
+
–
Figure 13b. Charge Pump Phase 1 for
±
5V.
V
CC
= +5V
+5V
V
DD
Storage Capacitor
C
1
C
2
C
4
+
+
+
–
–
–
V
SS
Storage Capacitor
C
3
+
–
–5V
Figure 13a. Charge Pump Phase 1 for
±
10V.
FEATURES…
The
SP504
is a highly integrated serial trans-
ceiver that allows software control of its inter-
face modes. Similar to the SP503, the
SP504
offers the same hardware interface modes for
RS-232 (V.28), RS-422A (V.11), RS-449, RS-
485, V.35, EIA-530 and includes V.36 and
EIA-530A. The interface mode selection is done
via an 8–bit switch; four (4) bits control the
drivers and four (4) bits control the receivers.
The
SP504
is fabricated using low power
BiCMOS process technology, and incorporates
a
Sipex
patented (5,306,954) charge pump
allowing +5V only operation. Each device is
packaged in an 80–pin JEDEC Quad FlatPack
package.
The
SP504
is ideally suited for wide area net-
work connectivity based on the interface modes
offered and the driver and receiver configura-
tions. The
SP504
has seven (7) independent
drivers and seven (7) independent receivers. In
V.35 mode, the
SP504
includes the necessary
components and termination resistors internal
within the device for compliant V.35 operation.
THEORY OF OPERATION
The
SP504
is made up of five separate circuit
blocks — the charge pump, drivers, receivers,
decoder and switching array. Each of these
circuit blocks is described in more detail below.
Charge–Pump
The
SP504
's charge pump design is based on the
SP503 where
Sipex
's patented charge pump
design (5,306,954) uses a four–phase voltage
shifting technique to attain symmetrical
±
10V
power supplies. In addition, the
SP504
charge
pump incorporates a "programmable" feature
that produces an output of
±
10V or
±
5V for V
and V
depending on the mode of operation.
The charge pump still requires external capaci-
tors to store the charge.
Figure 17a
shows the
waveform found on the positive side of capaci-
tor C2, and
Figure 17b
shows the negative side
of capcitor C2. There is a free–running oscilla-
tor that controls the four phases of the voltage
shifting. A description of each phase follows.
The
SP504
charge pump is used for RS-232
where the output voltage swing is typically
±
10V and also used for RS-423. However, RS-
423 requires the voltage swing on the driver
output be between
±
4V to
±
6V during an open
circuit (no load). The charge pump would need
to be regulated down from
±
10V to
±
5V. A
typical
±
10V charge pump would require exter-
nal clamping such as 5V zener diodes on V
and V
to ground. The
±
5V output has sym-
metrical levels as in the
±
10V output. The
±
5V
is used in the following modes where RS-423
levels are used: RS-449, EIA-530, EIA-530A
and V.36.
Phase 1 (
±
10V)
— V
charge storage — During this phase of
the clock cycle, the positive side of capacitors
C
and C
are initially charged to +5V. The C
l
is then switched to ground and the charge on C
is transferred to C
+5V, the voltage potential across capacitor C
2
is
now 10V.
+
–
–
. Since C
+
is connected to
Phase 1 (
±
5V)
— V
& V
charge storage and transfer —
With the C
1
and C
capacitors initially charged
to +5V, C
charge on C
capacitor. Simultaneously the C
2
ground and the 5V charge on C
2
to the V
DD
storage capacitor.
+
is then switched to ground and the
–
is transferred to the V
storage
–
is switched to
+
is transferred
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PDF描述 |
|---|---|
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| SP505 | WAN Multi-Mode Serial Transceiver |
| SP505AB | WAN Multi-Mode Serial Transceiver |
| SP505ACF | WAN Multi-Mode Serial Transceiver |
| SP505ACM | WAN Multi-Mode Serial Transceiver |
相關代理商/技術參數(shù) |
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|---|---|
| SP50-4G | 制造商:Aavid Thermalloy 功能描述: |
| SP504MCF | 制造商:Exar Corporation 功能描述: 制造商:Exar Corporation 功能描述:Line Transceiver, 7-Driver, 7-Receiver, 80 Pin, Plastic, QFP |
| SP504MCF-L | 制造商:Exar Corporation 功能描述:TRANSCEIVER MULTIPROTOCOL SERIAL 制造商:Exar Corporation 功能描述:IC, WAN MULTIMODE SERIAL TXRX, MQFP-80; Device Type:Transceiver; IC Interface Type:RS232, RS422, RS449, RS485, EIA530, EIA530A; No. of Drivers:7; Supply Voltage Min:4.75V; Supply Voltage Max:5.25V; Driver Case Style:MQFP ;RoHS Compliant: Yes |
| SP504MCM-L | 功能描述:總線收發(fā)器 WAN Multi-Mode Serial RoHS:否 制造商:Fairchild Semiconductor 邏輯類型:CMOS 邏輯系列:74VCX 每芯片的通道數(shù)量:16 輸入電平:CMOS 輸出電平:CMOS 輸出類型:3-State 高電平輸出電流:- 24 mA 低電平輸出電流:24 mA 傳播延遲時間:6.2 ns 電源電壓-最大:2.7 V, 3.6 V 電源電壓-最小:1.65 V, 2.3 V 最大工作溫度:+ 85 C 封裝 / 箱體:TSSOP-48 封裝:Reel |
| SP504MCM-L/TR | 功能描述:LIN 收發(fā)器 WAN Multi-Mode Serial Transceiver RoHS:否 制造商:NXP Semiconductors 工作電源電壓: 電源電流: 最大工作溫度: 封裝 / 箱體:SO-8 |
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