TMS3637 Datasheet, PDF (31/53 Pages) Texas Instruments – Remote Control Transmitter/Receiver

TRAIN CODES
CD
CE
NO. OF
CODES
00
1
10
2
01
4
11
8
VTR Receiver
CG = 1, CH = 0
Receiver
CA = 0, CC = 0
Train Receiver
CG = 1, CH = 1
Q-State Receiver
CG = 0, CH = 0
2 Codes 4 Codes 8 Codes
CD,CE CD, CE CD, CE
1 Code 2 Codes 4 Codes 8 Codes
CD, CE CD, CE CD, CE CD, CE
Modulated Normal Modulated Normal
CB = 0 CB = 1 CB = 0 CB = 1
Analog Logic
CF = 0 CF = 1
Analog Logic
CF = 0 CF = 1
Modulated Normal
CB = 0 CB = 1
Analog Logic
CF = 0 CF = 1
Noninverting
Inverting
Figure 5–7. Receiver Configurations
5.12.1 Normal Mode (CB = 1)
The normal receiver function corresponds to a normal transmitter.
5.12.2 Modulated Mode (CB = 0)
The modulated receiver functions in a way that corresponds to a modulated transmitter. The oscillator
frequency of the receiver must be 480 kHz. The signal used as an input must be demodulated to the carrier
frequency of 40 kHz and then sent to IN.
5.12.3 Analog Mode (CF = 0)
In this configuration, the received code is sent directly to IN where it is amplified and passed through a
comparator to filter and square the received code waveform to logic levels. The phase of the output signal
of the internal amplifier section is reversed with respect to the input. The capacitor connected between CEX
and GND and the internal resistor of 178 Ω determines the cutoff frequency of the amplifier, which is in a
high-pass configuration.
5–13