UAA3220TS View Datasheet(PDF) - Philips Electronics

Part Name

Description

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UAA3220TS

Frequency Shift Keying (FSK)/Amplitude Shift Keying (ASK) receiver

Philips Electronics 

Philips Semiconductors

Frequency Shift Keying (FSK)/Amplitude

Shift Keying (ASK) receiver

Product specification

UAA3220TS

Data slicer

Data detection is provided by means of a level comparator

with adaptive slice reference. After the first data filter stage

the pre-filtered data is split into two paths. One passes the

second data filter stage and is fed to the positive

comparator input. The other path is fed to an integration

circuit with a large time constant in order to derive the

average value (DC component) as an adaptive slice

reference which is presented to the negative comparator

input. The internal buffer provides 13 dB AC voltage gain.

The adaptive reference allows to detect the received data

over a large range of noise floor levels. The integration

circuit consists of a simple RC low-pass filter with on-chip

resistors. The data slicer output is designed with internal

pull-up.

RSSI buffer

The RSSI buffer is an amplifier with a voltage gain of 0 dB.

At FSK receive mode the RSSI output provides a field

strength indication. It has an output impedance of 10 kΩ.

Figure 3 shows the level curve (RSSI curve) as a function

of the limiter input voltage (RMS value).

1.55

handbook, full pagewidth

VRSSI

(V)

1.45

1.35

1.25

MGM744

(1)

(2)

(3)

1.15

10-7

(1) Tamb = 85 °C.

(2) Tamb = 27 °C.

(3) Tamb = −40 °C.

10-6

10-5

10-4

10-3

Fig.3 Level curve VRSSI as a function of VLIN(rms).

10-2 VLIN(rms) (V) 10-1

1999 Jan 22

6

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