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ADM1385 数据表(PDF) 7 Page - Analog Devices

部件名 ADM1385
功能描述  Low Power, 3.3 V, RS-232 Line Drivers/Receivers
Download  8 Pages
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制造商  AD [Analog Devices]
网页  http://www.analog.com
标志 AD - Analog Devices

ADM1385 数据表(HTML) 7 Page - Analog Devices

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ADM3202/ADM3222/ADM1385
–7–
REV. A
OUTLINE DIMENSIONS
Dimensions shown in inches and (mm).
16-Lead Plastic DIP
(N-16)
16
18
9
0.840 (21.34)
0.745 (18.92)
0.280 (7.11)
0.240 (6.10)
PIN 1
SEATING
PLANE
0.022 (0.558)
0.014 (0.356)
0.060 (1.52)
0.015 (0.38)
0.210 (5.33)
MAX
0.130
(3.30)
MIN
0.070 (1.77)
0.045 (1.15)
0.100
(2.54)
BSC
0.160 (4.06)
0.115 (2.93)
0.325 (8.26)
0.300 (7.62)
0.015 (0.381)
0.008 (0.204)
0.195 (4.95)
0.115 (2.93)
16-Lead Thin Shrink Small Outline (TSSOP)
(RU-16)
16
9
8
1
0.201 (5.10)
0.193 (4.90)
PIN 1
SEATING
PLANE
0.006 (0.15)
0.002 (0.05)
0.0118 (0.30)
0.0075 (0.19)
0.0256
(0.65)
BSC
0.0433
(1.10)
MAX
0.0079 (0.20)
0.0035 (0.090)
0.028 (0.70)
0.020 (0.50)
16-Lead Narrow Body SOIC
(R-16A)
16
9
8
1
0.3937 (10.00)
0.3859 (9.80)
0.2440 (6.20)
0.2284 (5.80)
0.1574 (4.00)
0.1497 (3.80)
PIN 1
SEATING
PLANE
0.0098 (0.25)
0.0040 (0.10)
0.0192 (0.49)
0.0138 (0.35)
0.0688 (1.75)
0.0532 (1.35)
0.0500
(1.27)
BSC
0.0099 (0.25)
0.0075 (0.19)
0.0500 (1.27)
0.0160 (0.41)
8
0
0.0196 (0.50)
0.0099 (0.25)
x 45
16-Lead Wide Body SOIC
(R-16)
16
9
8
1
0.4133 (10.50)
0.3977 (10.00)
PIN 1
SEATING
PLANE
0.0118 (0.30)
0.0040 (0.10)
0.0192 (0.49)
0.0138 (0.35)
0.1043 (2.65)
0.0926 (2.35)
0.0500
(1.27)
BSC
0.0125 (0.32)
0.0091 (0.23)
0.0500 (1.27)
0.0157 (0.40)
0.0291 (0.74)
0.0098 (0.25)
x 45
8
0
C1
+
C3
+
S3
S4
S1
S2
INTERNAL
OSCILLATOR
VCC
GND
VCC
V+ = 2VCC
Figure 9. Charge Pump Voltage Doubler
C2
+
C4
+
S3
S4
S1
S2
INTERNAL
OSCILLATOR
V+
GND
V– = –(V+)
GND
FROM
VOLTAGE
DOUBLER
Figure 10. Charge Pump Voltage Inverter
Transmitter (Driver) Section
The drivers convert 3.3 V logic input levels into RS-232 output
levels. With VCC = +3.3 V and driving an RS-232 load, the
output voltage swing is typically
±6 V.
Receiver Section
The receivers are inverting level-shifters that accept RS-232
input levels and translate them into 3 V logic output levels.
The inputs have internal 5 k
Ω pull-down resistors to ground and
are also protected against overvoltages of up to
±30 V. Uncon-
nected inputs are pulled to 0 V by the internal 5 k
Ω pull-down
resistor. This, therefore, results in a Logic 1 output level for
unconnected inputs or for inputs connected to GND.
The receivers have Schmitt trigger inputs with a hysteresis level
of 0.4 V. This ensures error-free reception for both noisy inputs
and for inputs with slow transition times.
HIGH BAUD RATE
The ADM3202E/ADM3222E feature high slew rates permitting
data transmission at rates well in excess of the EIA/RS-232E
specifications. RS-232 voltage levels are maintained at data rates
up to 460 kbps even under worst case loading conditions. This
allows for high speed data links between two terminals or indeed
it is suitable for the new generation ISDN modem standards which
requires data rates of 230 kbps. The slew rate is internally con-
trolled to less than 30 V/
µs in order to minimize EMI interference.


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