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)

8°

0°

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

GND

Figure 9. Charge Pump Voltage Doubler

C2

+

C4

+

S3

S4

S1

S2

INTERNAL

OSCILLATOR

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

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

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.