Philips UAA3220TS Datasheet

INTEGRATED CIRCUITS

DATA SH EET

UAA3220TS

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

Product specification
Supersedes data of 1998 April 10
File under Integrated Circuits, IC01

1999 Jan 22

Philips Semiconductors Product specification

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

FEATURES

• Low cost single-chip ASK or FSK receiver

• Superheterodyne architecture with high integration level

• Few external low cost components and crystal required

• Wide supply voltage range

• Low power consumption

• Wide frequency range, 250 to 920 MHz

• High sensitivity

• IF bandwidth determined by application

• High selectivity

• Automotive temperature range

• SSOP24 package.

Applications

• Keyless entry systems

• Car alarm systems

• Remote control systems

• Security systems

• Telemetry systems

• Wireless data transmission

• Domestic appliance.

UAA3220TS

GENERAL DESCRIPTION

The UAA3220TS is a fully integrated single-chip receiver,
primarily intended for use in VHF and UHF systems.
It supports both Amplitude Shift Keying (ASK) and
Frequency Shift Keying (FSK) demodulation.
By connecting DEMO1 (pin 10) to ground during
realisation of the receiver module the UAA3220TS works
as an ASK receiver (see Fig.10). By connecting pin 10 as
shown in Fig.9 the UAA3220TS works as an FSK receiver.
The UAA3220TS incorporates a crystal stabilized local
oscillator, frequency multiplier, balanced mixer, post mixer
amplifier, limiter, Received Signal Strength Indicator
(RSSI), FSK demodulator, data filter, data slicer and
power down circuit.

QUICK REFERENCE DATA

SYMBOL PARAMETER CONDITIONS MIN. TYP. MAX. UNIT

V

CC

I

CC

supply voltage 2.7 − 5.5 V
supply current f

= 433.92 MHz; FSK mode

i(RF)

operating mode on;

=0V

V

PWD

operating mode off;
V

PWD=VCC

2.8 4.3 5.8 mA

− 330µA

ASK mode

P

i(max)(ASK)

Φ

i(ASK)

maximum input power BER ≤ 3% −22 −16 −10 dBm
sensitivity into pin MIXIN f

= 433.92 MHz; BER ≤ 3% −−119 −113 dBm

i(RF)

FSK mode

P

i(max)(FSK)

Φ

i(FSK)

maximum input power BER ≤ 3% −6 0 +1 dBm
sensitivity into pin MIXIN f

= 433.92 MHz; BER ≤ 3% −−103 −100 dBm

i(RF)

1999 Jan 22 2

Philips Semiconductors Product specification

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

ORDERING INFORMATION

TYPE

NUMBER

UAA3220TS SSOP24

BLOCK DIAGRAM

MIXIN

MGND

handbook, full pagewidth

23

24

MIXER

NAME DESCRIPTION VERSION

plastic shrink small outline package; 24 leads; body width 5.3 mm

V

PMA

FA

CCI

22

21 20

LIMITER

AMPLIFIER

LFB

19

PACKAGE

CPC CPA

RSSILIN

17

CPB

16 1518

DEMODULATOR

UAA3220TS

SOT340-1

DATA14CGND

13

AM/FM

SWITCH

OGND

1

OSCILLATOR

2

OSE

OSB

UAA3220TS

×2/×3

3

4

V

OSC

CC

+

DATA SLICER

−

MULTIPLIER

×3

7TN8

TEM

6

TP

5

BIAS

PWD

9

10

DEMO1

11

DEMO2

12

MGM742

GND

Fig.1 Block diagram.

1999 Jan 22 3

Philips Semiconductors Product specification

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

PINNING

SYMBOL PIN DESCRIPTION

OGND 1 oscillator ground
OSE 2 oscillator emitter
OSB 3 oscillator base
V

CC

OSC 5 oscillator collector
TEM 6 frequency multiplier emitter resistor
TN 7 frequency multiplier negative output
TP 8 frequency multiplier positive output
PWD 9 power down control input
DEMO1 10 FM demodulator 1, ASK/FSK switch
DEMO2 11 FM demodulator 2
GND 12 general ground
CGND 13 comparator ground
DATA 14 data output
CPA 15 comparator input A
CPB 16 comparator input B
CPC 17 comparator input C
RSSI 18 RSSI output
LFB 19 limiter feedback
LIN 20 limiter input
V

CCI

FA 22 IF amplifier output
MIXIN 23 mixer input
MGND 24 mixer ground

4 positive supply voltage

21 IF amplifier positive supply voltage

handbook, halfpage

OGND

1

OSE

2

OSB

3

V

4

CC

OSC

5

TEM

6

UAA3220TS

TN

7
8

TP

PWD

9
DEMO1
DEMO2

GND

10
11
12

MGM743

Fig.2 Pin configuration.

UAA3220TS

MGND

24

MIXIN

23

FA

22

V

21

CCI

LIN

20
19

LFB
RSSI

18
17

CPC
CPB

16

CPA

15

DATA

14

CGND

13

1999 Jan 22 4

Philips Semiconductors Product specification

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

FUNCTIONAL DESCRIPTION
Mixer

The mixer is a single-balanced emitter-coupled mixer with
internal biasing. Matching of the RF source impedance to
the mixer input requires an external matching network.

Oscillator

The oscillator is based on a transistor connected in
common collector configuration followed by a cascode
stage driving a tuned circuit. The voltage at this tuned
circuit drives the frequency multiplier. The bias current of
the oscillator is set by an off-chip resistor (R40 in the
application diagram of Fig.9) to a typical value of 260 µA at

433.92 MHz (R40 = 1.8 kΩ). The oscillator frequency is
controlled by an off-chip overtone crystal (X40). Off-chip
capacitors between base and emitter (C42) and ground
(C41) make the oscillator transistor appear as having
negative resistance at small signal levels. This causes the
oscillator to start. A parallel resonance circuit (L40 and
C41) connected to the emitter of the oscillator transistor
prevents oscillation at the fundamental frequency of the
crystal. The LC tank circuit at the output of the oscillator is
used to select either the fundamental, the second or the
third harmonic of the oscillator frequency.

Frequency multiplier

UAA3220TS

Limiter

The limiter is a single-ended input multiple stage amplifier
with high total gain. Amplifier stability is achieved by
means of an external DC feedback capacitor (C21), which
is also used to determine the lower limiter cut-off
frequency. An RSSI signal proportional to the limiter input
signal is provided. Figure 3 shows the DC voltage at pin 18
(RSSI) as a function of the input voltage (RMS value) at
pin 20 (LIN). It also gives the typical IF of 10.7 MHz.
The lower knee of the level curve (see Fig.3) is determined
by the effective noise bandwidth and is, consequently,
slightly higher.

IF filter

IF filtering with high selectivity is realized by means of an
external ceramic filter (X20), which feeds the IF from the
PMA to the limiter.

FM demodulator

Coming from the limiter the FSK signal is fed differential to
the input of the FM demodulator. After buffering the signal
is fed to a phase detector. The phase shift is generated by
an external LC combination connected to DEMO1 (pin 10)
and DEMO2 (pin 11). The baseband signal is coupled out
single ended via an output buffer and is fed to the FSK
input of the ASK/FSK switch.

The frequency multiplier is an emitter-coupled transistor
pair driving an off-chip balanced tuned circuit. The bias
current of this emitter coupled pair is set by an off-chip
resistor (R50) to a typical value of 350 µA at 433.92 MHz
(R50 = 1.2 kΩ). The oscillator output signal is AC-coupled
to one of the inputs of the emitter-coupled pair. The other
input is connected to ground via an on-chip capacitor.
The output voltage of the frequency multiplier drives the
switching stage of the mixer. The bias voltage at this point
is set by an off-chip resistor (R51) to allow sufficient
voltage swing at the mixer outputs.

Post mixer amplifier

The Post Mixer Amplifier (PMA) is a differential input,
single-ended output amplifier. Amplifier gain is provided in
order to reduce the influence of the limiter noise figure on
the total noise figure.

ASK/FSK switch

The selection of either ASK or FSK reception will be done
by the DEMO1 (pin 10). Grounding this pin to 0 V will
switch the IC to ASK mode. Additional the FM demodulator
and parts of the data slicer will be switched off. In FSK
mode DEMO1 (pin 10) is connected to DEMO2 (pin 11)
via a LC combination (see Fig.9).

Data filters

After demodulation a two-stage data filtering circuit is
provided in order to suppress unwanted frequency
components. Two RC low-pass filters with on-chip
resistors are provided which are separated by a buffer
stage.

1999 Jan 22 5

Philips Semiconductors Product specification

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

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.

1.55

handbook, full pagewidth

V

RSSI

(V)

UAA3220TS

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).

MGM744

1.45

1.35

1.25

1.15

(1) T
(2) T
(3) T

10

amb
amb
amb

-7

=85°C.
=27°C.
= −40°C.

(1)

(2)

(3)

-6

10

Fig.3 Level curve V

-5

10

-4

10

as a function of V

RSSI

-3

10

LIN(rms)

-2

10

V

LIN(rms)

(V)

-1

10

.

1999 Jan 22 6

Philips Semiconductors Product specification

Frequency Shift Keying (FSK)/Amplitude

UAA3220TS

Shift Keying (ASK) receiver

LIMITING VALUES

In accordance with the Absolute Maximum Rating System (IEC 134).

SYMBOL PARAMETER CONDITIONS MIN. MAX. UNIT

V

CC

P

i(max)

T

amb

T

stg

V

es

Note

1. Machine model: C = 200 pF, R = 0 Ω and L = 0.75 µH; pins are connected to GND and V

supply voltage −0.3 +8.0 V
absolute maximum input power − 3 dBm
operating ambient temperature −40 +85 °C
storage temperature −55 +125 °C
electrostatic handling note 1

pins 3 and 6 −50 +50 V
pin 2 −100 +100 V
pin 5 −250 +150 V
pin 23 −200 +250 V
all other pins −250 +250 V

.

CC

THERMAL CHARACTERISTICS

SYMBOL PARAMETER CONDITIONS VALUE UNIT

R

th(j-a)

thermal resistance from junction to ambient in free air 125 K/W

1999 Jan 22 7

Philips Semiconductors Product specification

Frequency Shift Keying (FSK)/Amplitude

UAA3220TS

Shift Keying (ASK) receiver

DC CHARACTERISTICS

V

= 2.7 V; T

CC

SYMBOL PARAMETER CONDITIONS MIN. TYP. MAX. UNIT

Supplies

V

CC

I

CC

V

PWD

I

PWD

Oscillator

V

OSE

V

OSB

Multiplier

V

TEM

V

TN,TP

Mixer

V

MIXIN

Post mixer amplifier

V

FA

Limiter

V

LIN

V

LFB

V

RSSI

=25°C; for application diagram see Figs 9 and 10; crystal disconnected; unless otherwise specified.

amb

supply voltage 2.7 − 5.5 V
supply current operating mode on;

V

= 0 V; notes 1 and 2

PWD

FSK demodulation;

2.8 4.3 5.8 mA

note 3
ASK demodulation;

2.5 3.7 4.9 mA

note 4

operating mode off;
V

PWD=VCC

voltage on pin PWD operating mode on

− 330µA

0 − 300 mV

(receiving mode)
operating mode off

V

− 0.3 − V

CC

CC

(sleep mode)

current into pin PWD operating mode on

−30 −10 −3 µA
(receiving mode);
V

=0V

PWD

operating mode off

− 215µA
(sleep mode);
V

PWD=VCC

DC voltage at pin 2 independent of oscillator 0.33 0.38 0.43 V
DC voltage at pin 3 independent of oscillator 1.05 1.15 1.25 V

DC voltage at pin 6 independent of oscillator 0.33 0.39 0.45 V
DC voltage at pins 7 and 8 independent of oscillator 2.01 2.21 2.41 V

DC voltage at pin 23 independent of oscillator 0.68 0.78 0.88 V

DC voltage at pin 22 independent of oscillator 1.10 1.25 1.40 V

DC voltage at pin 20 independent of oscillator 1.85 1.95 2.05 V
DC voltage at pin 19 independent of oscillator 1.85 1.95 2.05 V
DC voltage at pin 18 independent of oscillator 1.00 1.16 1.32 V

V

1999 Jan 22 8

Philips Semiconductors Product specification

Frequency Shift Keying (FSK)/Amplitude

UAA3220TS

Shift Keying (ASK) receiver

SYMBOL PARAMETER CONDITIONS MIN. TYP. MAX. UNIT

Demodulator

V

DEMO1,2

DC voltage at pins 10 and 11 independent of oscillator;

note 5

V

DEMO1(ASK)

DC voltage at pin 10 to switch in
ASK mode

Data filter and slicer

V

CPA,CPB,CPC

DC voltage at pins 15, 16 and 17 ASK mode 1.27 1.42 1.57 V

FSK mode; note 6 1.81 2.01 2.21 V

V

OH(DATA)

V

OL(DATA)

HIGH-level output voltage at pin 14 I
LOW-level output voltage at pin 14 I

= −10 µAV

DATA

= 200 µA0−0.6 V

DATA

Notes

1. For f

= 868.35 MHz all values + 0.6 mA.

i(RF)

2. Crystal connected; oscillator and multiplier active.

3. Pin DEMO1 connected to pin DEMO2 via tank circuit.

4. Pin DEMO1 short circuited to ground.

5. The given values are applicable for FSK reception mode. In ASK mode pin 10 is short circuited to ground.

6. No modulation and fIF= 10.7 MHz.

2.00 2.24 2.48 V

0 − 300 mV

− 0.5 − V

CC

CC

V

1999 Jan 22 9

Philips Semiconductors Product specification

Frequency Shift Keying (FSK)/Amplitude

UAA3220TS

Shift Keying (ASK) receiver

AC CHARACTERISTICS

V

= 2.7 V; T

CC

f

= 868.35 MHz (see Table 5); f

i(RF)

SYMBOL PARAMETER CONDITIONS MIN. TYP. MAX. UNIT

System performance

f

i(RF)

f

IF

P

i(max)

P

SPUR

f

DATA

t

on(RX)

V

RSSI

ASK mode

Φ

i(ASK)

FSK mode

Φ

i(FSK)

∆f frequency deviation (peak value) 4 10 75 kHz
∆Φ

(FSK)(max)

G

dem

=25°C; for application diagram see Figs 9 and 10; f

amb

= 1 kHz square wave; unless otherwise specified.

mod

= 433.92 MHz (see Table 4) and

i(RF)

RF input frequency 250 − 920 MHz
IF frequency 10.56 10.7 10.84 MHz
maximum input power −−3 dBm

ASK mode; BER ≤ 3%;

−22 −16 −10 dBm

notes 1 and 2
FSK mode; BER ≤ 3%;

−6 0 +1 dBm

notes 2 and 3
spurious radiation note 4 −−−57 dBm
data frequency note 5 − 1 − kHz
receiver turn-on time notes 6 and 7

= 433.92 MHz − 610ms

f

i(RF)

f

= 868.35 MHz − 37ms

i(RF)

RSSI voltage 1.1 − 1.6 V

input sensitivity directly into pin MIXIN BER ≤ 3%; notes 1 and 2

f

= 433.92 MHz −−119 −113 dBm

i(RF)

f

= 868.35 MHz −−116 −110 dBm

i(RF)

input sensitivity directly into pin MIXIN BER ≤ 3%; notes 2 and 3 −−103 −100 dBm

maximum sensitivity degradation ∆f=4kHz −−3dB
demodulator gain note 8 0.75 1.0 1.25

mV

--------- ­kHz

Mixer and post mixer amplifier

Z

IP3
G
Z

i

PMA

PMA

o(IF)

input impedance of mixer f

i(RF)

f

i(RF)

interception point (mixer + PMA) −38 −30 − dBm
gain (mixer + PMA) note 9 40 42 50 dB
output impedance of IF amplifier 280 330 380 Ω

1999 Jan 22 10

= 433.92 MHz − 600 −Ω
= 868.35 MHz − 300 −Ω