LMT2 datasheet(5/11 Pages) ETC2

5 / 11 page

Radiometrix Ltd

LMT2/LMR2 Data Sheet

page 5

Pin description – LMR2

Name

Function

Vcc

3.1 – 15V power supply

Ground

RXE

Receiver Enable (active high)

RXD

Data out (open collector, no pullup)

AF out

700mV p-p audio. DC coupled, approx 0.8v bias.`

P0/PGM

Parallel Channel select LSB

Serial frequency programming / configuration1

Parallel Channel select

Parallel Channel select MSB

RSSI

DC level between 0.5v and 2.2v. 60dB dynamic range

NOTES:

1. Serial programming is by an inverted, cmos logic level, 2400 baud RS232 datastream applied to

the P0 pin.

2. Channel select inputs have pullups (50k

Ω) to 3v internal rail. Do not exceed 3v logic levels on

this port.

3. Channel select inputs are active low

4. All pins are on an 0.1" grid

5. Data recovery circuit used for RXD is not a simple 'average and compare' type. It is a peak

sampling quasi-DC coupled design, allowing a greater than usual flexibility in data format.

6. Unit will operate (with marginally reduced specifications) from a 3.0v rail. This must be well

regulated and without noise or ripple, as in this state the unit's internal regulator no longer

operates, and provides no supply rejection.

Figure 5: LMR2 footpint (top view)

LMT2 Datasheet(PDF) 5 Page - List of Unclassifed Manufacturers