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PDF AD7306 Data sheet ( Hoja de datos )
| Número de pieza | AD7306 | |
| Descripción | +5 V Powered RS-232/RS-422 Transceiver | |
| Fabricantes | Analog Devices | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de AD7306 (archivo pdf) en la parte inferior de esta página. Total 8 Páginas | ||
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a
+5 V Powered
RS-232/RS-422 Transceiver
FEATURES
RS-232 and RS-422 on One Chip
Single +5 V Supply
0.1 F Capacitors
Short Circuit Protection
Excellent Noise Immunity
Low Power BiCMOS Technology
High Speed, Low Skew RS-422 Operation
–40؇C to +85؇C Operations
APPLICATIONS
DTE-DCE Interface
Packet Switching
Local Area Networks
Data Concentration
Data Multiplexers
Integrated Services Digital Network (ISDN)
GENERAL DESCRIPTION
The AD7306 line driver/receiver is a 5 V monolithic product
which provides an interface between TTL signal levels and dual
standard EIA RS-232/RS-422 signal levels. The part contains
two RS-232 drivers, one RS-422 driver, one RS-232 receiver,
and one receiver path which can be configured either as RS-232
or as RS-422.
An internal charge pump voltage converter facilitates operation
from a single +5 V power supply. The internal charge pump
generates ± 10 V levels allowing RS-232 output levels to be de-
veloped without the need for external bipolar power supplies.
A highly efficient charge pump design allows operation using
non polarized, miniature 0.1 µF capacitors. This gives a consid-
erable saving in printed circuit board space over conventional
products which can use up to 10 µF capacitors. The charge
pump output voltages may also be used to power external cir-
cuitry which requires dual supplies.
AD7306
FUNCTIONAL BLOCK DIAGRAM
V+ 1
C1+ 2
C1– 3
R2IN
T1OUT
T2OUT
VCC
4
5
6
7
R1IN (B)
R1IN /R1IN (A)
8
9
T3OUT (B) 10
T3OUT (A) 11
NC 12
AD7306
SOIC
TOP VIEW
(Not to Scale)
24 V–
23 C2–
22 C2+
21 R2OUT
20 T1IN
19 T2IN
18 GND
17 R1OUT
16 T3IN
15 232/422 SEL
14 GND
13 NC
NC = NO CONNECT
The RS-232 channels are suitable for communications rates up
to 100 kHz and the RS-422 channels are suitable for high speed
communications up to 5 MHz. The RS-422 transmitter comple-
mentary outputs are closely matched and feature low timing
skew between the complementary outputs. This is often an es-
sential requirement to meet tight system timing specifications.
All inputs feature ESD protection, all driver outputs feature
high source and sink current capability and are internally pro-
tected against short circuits on the outputs. An epitaxial layer is
used to guard against latch-up.
The part is available in a 24-lead SOIC and 24-pin plastic DIP
package.
REV. B
Information furnished by Analog Devices is believed to be accurate and
reliable. However, no responsibility is assumed by Analog Devices for its
use, nor for any infringements of patents or other rights of third parties
which may result from its use. No license is granted by implication or
otherwise under any patent or patent rights of Analog Devices.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 617/329-4700
Fax: 617/326-8703
1 page  
0.1µF
+5V INPUT
0.1µF
0.1µF
7
2 C1+
3
C1–
VCC
±10V
POWER
1
V+
22
23
C2+
SUPPLY
GENERATOR
V–
C2–
24
0.1µF
0.1µF
T1 IN
20
T1
TTL/CMOS
INPUTS T2 IN
T3 IN
19
16
T2
T3
AD7306
R2 OUT
21
R2
TTL/CMOS
OUTPUTS
R1 OUT
17
R1
15
232/422 SEL
5
T1 OUT
RS-232
6 OUTPUTS
T2 OUT
10 RS-422
11 T3 OUT (B) OUTPUT
T3 OUT (A)
4 RS-232
R2 IN INPUT
9 RS-232/
R1IN /R1IN (A) RS-422
INPUT
8
R1IN (B)
RS-422
INPUT
18 14
Figure 1. AD7306 Application Circuit
T3 IN
T3 OUT (B)
T3 RL DIFF = 100Ω
CL1 = 100pF
CL2 = 100pF
T3 OUT (A)
Figure 2. RS-422 Driver. Propagation Delay Test Circuit
T3 OUT (B)
T3 IN
T3
VOD
RL DIFF
T3 OUT (A)
Figure 3. RS-422 Driver. Voltage Measurement Test
Circuit
AD7306
3V
1.5V
0V
T3 OUT (A)
1/2 VO
VO
t PLH
T3 OUT (B)
VO
0V
–VO
t SKEW
90% POINT
10% POINT
tR
1.5V
t PHL
t SKEW
90% POINT
10% POINT
tF
Figure 4. RS-422 Driver. Propagation Delay Rise/Fall
Timing
DIFFERENTIAL
INPUT
R1IN (B) - R1IN (A)
2.5V
–2.5V
R1OUT
0V
t PHL
VOL
0V
tPLH
VOH
Figure 5. RS-422 Receiver Timing
232/422 SEL
1.5V
1.5V
t EN1
R1OUT
RS-232
t EN2
VOH
VOL
RS-422
VOH
VOL
RS-232
Figure 6. RS-232/RS-422 Receiver Enable Timing
REV. B
–5–
5 Page | ||
| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet AD7306.PDF ] | |
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