Rainbow-electronics MAX13237E Bedienungsanleitung PDF herunterladen (Seite 14)

MAX13234E–MAX13237E

3Mbps RS-232 Transceivers with

Low-Voltage Interface

14 ______________________________________________________________________________________

s/div

T1IN

T1OUT

R1OUT

3V/div

5V/div

= 3.3V

Figure 12. Loopback Test Results at 120kbps

100ns/div

T1IN

T1OUT

R1OUT

3.3V/div

5V/div

3.3V/div

= 3.3V

Figure 13. Loopback Test Results at 3Mbps

T_IN

R_OUT

FORCEON

FORCEOFF

C1+

C1-

C2+

C2-

*C3 CAN BE RETURNED TO V

OR GND.

1.62V to V

V+

V-

BYPASS2

GND

T_OUT

R_IN

MAX13236E

MAX13237E

5kΩ

1000pF

C3*

BYPASS1

Figure 11. Loopback Test Circuit

Chip Information

PROCESS: BiCMOS

High Data Rates

The MAX13234E–MAX13237E maintain the RS-232 ±5V

minimum transmitter output voltage even at high data

rates. Figure 11 shows a transmitter loopback test cir-

cuit. Figure 12 shows a loopback test result at

120kbps, and Figure 13 shows the same test at 3Mbps.

In Figure 12, all transmitters were driven simultaneously

at 120kbps into RS-232 loads in parallel with 1000pF.

In Figure 13, a single transmitter was driven at 3Mbps,

and all transmitters were loaded with an RS-232 receiv-

er in parallel with 150pF.

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