Philips UAA3201T-V1 Datasheet

INTEGRATED CIRCUITS

DATA SHEET

UAA3201T

UHF/VHF remote control receiver

Product specification

2000 Apr 18

Supersedes data of 1995 May 18

File under Integrated Circuits, IC18

Philips Semiconductors	Product specification
UHF/VHF remote control receiver	UAA3201T

FEATURES

∙Oscillator with external Surface Acoustic Wave Resonator (SAWR)

∙Wide frequency range from 150 to 450 MHz

∙High sensitivity

∙Low power consumption

∙Automotive temperature range

∙Superheterodyne architecture

∙Applicable to fulfil FTZ 17 TR 2100 (Germany)

∙High integration level, few external components

∙Inexpensive external components

∙IF filter bandwidth determined by application.

QUICK REFERENCE DATA

APPLICATIONS

∙Car alarm systems

∙Remote control systems

∙Security systems

∙Gadgets and toys

∙Telemetry.

GENERAL DESCRIPTION

The UAA3201T is a fully integrated single-chip receiver, primarily intended for use in VHF and UHF systems employing direct AM Return-to-Zero (RZ) Amplitude Shift Keying (ASK) modulation.

SYMBOL	PARAMETER		CONDITIONS	MIN.		TYP.	MAX.	UNIT
VCC	supply voltage			3.5		−	6.0	V
ICC	supply current			−		3.4	4.8	mA
Pref	input reference sensitivity		fi(RF) = 433.92 MHz;	−		−	−105	dBm
			data rate = 250 bits/s;
			BER ≤ 3 × 10−2
Tamb	ambient temperature			−40		−	+85	°C
ORDERING INFORMATION
TYPE			PACKAGE
NUMBER	NAME		DESCRIPTION				VERSION
UAA3201T	SO16	plastic small outline package; 16 leads; body width 3.9 mm					SOT109-1

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Philips Semiconductors	Product specification
UHF/VHF remote control receiver	UAA3201T

BLOCK DIAGRAM

handbook, full pagewidth	RF_IN			IF FILTER		VCC
						C12
							C17			R1
					C19
VEM		MIXIN		FA	LIN	LFB	CPC			CPO
	15	14		16	13	12	11			10
	×		IF AMPLIFIER
							BUFFER
	MIXER
				LIMITER						9	DATA
									COMPARATOR
											data
	BUFFER
			VCC	BAND GAP		UAA3201T
OSCILLATOR				REFERENCE		Vref
4	5	1	2			3	6	7	8
OSC	OSE	MON	MOP			VCC	VEE	CPB	CPA	MHB679
								C14	C13
		C7
				Fig.1	Block diagram.
PINNING

	SYMBOL	PIN	DESCRIPTION
	MON	1	negative mixer output
	MOP	2	positive mixer output
	VCC	3	positive supply voltage		MON	1			16	FA
	OSC	4	oscillator collector		MOP	2			15	VEM
	OSE	5	oscillator emitter		VCC	3			14
										MIXIN
	VEE	6	negative supply voltage
					OSC	4			13	LIN
	CPB	7	comparator input B					UAA3201T
					OSE	5			12
	CPA	8	comparator input A							LFB
					VEE	6			11	CPC
	DATA	9	data output
	CPO	10	comparator offset adjustment		CPB	7			10	CPO
	CPC	11	comparator input C		CPA	8			9	DATA
	LFB	12	limiter feedback
								MED897
	LIN	13	limiter input
	MIXIN	14	mixer input
	VEM	15	negative supply voltage for mixer		Fig.2		Pin configuration.
	FA	16	IF amplifier output

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Philips Semiconductors	Product specification
UHF/VHF remote control receiver	UAA3201T

FUNCTIONAL DESCRIPTION

The RF signal is fed directly into the mixer stage where it is mixed down to nominal 500 kHz IF by the integrated oscillator controlled by an external SAWR (see Fig.1). The IF signal is then passed to the IF amplifier which increases the level. A 5th-order elliptic low-pass filter acts as main IF filtering. The output voltage of that filter is demodulated by a limiter that rectifies the incoming IF signal. The demodulated signal passes two RC filter stages and is then limited by a data comparator which makes it available at the data output.

Mixer

The mixer is a single balanced emitter coupled pair with internally set bias current. The optimum impedance is 320 Ω at 430 MHz. Capacitor C5 (see Fig.9) is used to transform a 50 Ω generator impedance to the optimum value.

Oscillator

The oscillator consists of a transistor in common base configuration and a tank circuit including the SAWR. Resistor R2 (see Fig.9) is used to control the bias current through the transistor. Resistor R3 is required to reduce unwanted responses of the tank circuit.

IF amplifier

The IF amplifier is a differential input, single-ended output emitter coupled pair. It is used to decouple the first and the second IF filter and to provide some additional gain in order to reduce the influence of the noise of the limiter on the total noise figure.

IF filters

The first IF filter is an RC filter formed by internal resistors and an external capacitor C7 (see Fig.1).

The second IF filter is an external elliptic filter. The source impedance is 1.4 kΩ and the load is high-impedance. The bandwidth of the IF filter in the application and test circuit (see Fig.9) is 800 kHz due to the centre frequency spread of the SAWR. It may be reduced when SAWRs with less tolerances are used or temperature range requirements are lower. A smaller bandwidth of the filter will yield a higher sensitivity of the receiver. As the RF signal is mixed down to a low IF signal there is no image rejection possible.

Limiter

The limiting amplifier consists of three DC coupled amplifier stages with a total gain of 60 dB. A Received Signal Strength Indicator (RSSI) signal is generated by rectifying the IF signal. The limiter has a lower frequency limit of 100 kHz which can be controlled by capacitors C12 and C19. The upper frequency limit is 3 MHz.

Comparator

The 2 × IF component in the RSSI signal is removed by the first order low-pass capacitor C17. After passing a buffer stage the signal is split into two paths, leading via

RC filters to the inputs of a voltage comparator. The time constant of one path (C14) is compared to the bit duration. Consequently the potential at the negative comparator input represents the average magnitude of the RSSI signal. The second path with a short time constant (C13) allows the signal at the positive comparator input to follow the RSSI signal instantaneously. This results in a variable comparator threshold, depending on the strength of the incoming signal. Hence the comparator output is switched on, when the RSSI signal exceeds its average value, i.e. when an ASK ‘on’ signal is received.

The low-pass filter capacitor C13 rejects the unwanted

2 × IF component and reduces the noise bandwidth of the data filter.

The resistor R1 is used to set the current of an internal source. This current is drawn from the positive comparator input, thereby applying an offset and driving the output into the ‘off’ state during the absence of an input signal. This offset can be increased by lowering the value of R1 yielding a higher noise immunity at the expense of reduced sensitivity.

Band gap reference

The band gap reference controls the biasing of the whole circuit. In this block currents are generated that are constant over the temperature range and currents that are proportional to the absolute temperature.

The current consumption of the receiver rises with increasing temperature, because the blocks with the highest current consumption are biased by currents that are proportional to the absolute temperature.

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Philips Semiconductors				Product specification
UHF/VHF remote control receiver				UAA3201T
LIMITING VALUES
In accordance with the Absolute Maximum Rating System (IEC 60134).
SYMBOL	PARAMETER	CONDITIONS	MIN.	MAX.	UNIT
VCC	supply voltage		−0.3	+8.0	V
Tamb	ambient temperature		−40	+85	°C
Tstg	storage temperature		−55	+125	°C
Ves	electrostatic handling voltage	note 1
	pins OSC and OSE		−2000	+1500	V
	pins LFB and MIXIN		−1500	+2000	V
	all other pins		−2000	+2000	V

Note

1. Human body model: equivalent to discharging a 100 pF capacitor through a 1.5 kΩ series resistor.

THERMAL CHARACTERISTICS

SYMBOL	PARAMETER	CONDITIONS	VALUE	UNIT
Rth(j-a)	thermal resistance from junction to ambient	in free air	105	K/W

DC CHARACTERISTICS

VCC = 3.5 V; all voltages referenced to VEE; Tamb = −40 to +85 °C; typical value for Tamb = 25 °C; for test circuit see Fig.9; SAWR disconnected; unless otherwise specified.

SYMBOL	PARAMETER	CONDITIONS	MIN.	TYP.	MAX.	UNIT
VCC	supply voltage		3.5	−	6.0	V
ICC	supply current	R2 = 680 Ω	−	3.4	4.8	mA
VOH(DATA)	HIGH-level output voltage at	IDATA = −10 μA; note 1	VCC − 0.5	−	VCC	V
	pin DATA
VOL(DATA)	LOW-level output voltage at	IDATA = +200 μA; note 1	0	−	0.6	V
	pin DATA
Note

1. IDATA is defined to be positive when the current flows into pin DATA.

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Philips Semiconductors	Product specification
UHF/VHF remote control receiver	UAA3201T

AC CHARACTERISTICS

VCC = 3.5 V; Tamb = 25 °C; for test circuit see Fig.9; R1 disconnected; for AC test conditions see Section “AC test conditions”; unless otherwise specified.

SYMBOL	PARAMETER	CONDITIONS	MIN.	TYP.	MAX.	UNIT
P	input reference sensitivity	BER ≤ 3 × 10−2; note 1	−	−	−105	dBm
ref
P	maximum input power	BER ≤ 3 × 10−2	−	−	−30	dBm
i(max)
Pspur	spurious radiation	note 2	−	−	−60	dBm
IP3mix	interception point (mixer)		−20	−17	−	dBm
IP3IF	interception point (mixer plus IF amplifier)		−38	−35	−	dBm
P1dB	1 dB compression point (mixer)		−38	−35	−	dBm
ton(RX)	receiver turn-on time	note 3	−	−	10	ms

Notes

1.Pref is the maximum available power at the input of the test board. The Bit Error Rate (BER) is measured using the test facility shown in Fig.8.

2.Valid only for the reference PCB (see Figs 10 and 11). Spurious radiation is strongly dependent on the PCB layout.

3.The supply voltage VCC is pulsed as explained in Fig.3.

INTERNAL PIN CONFIGURATION

PIN

SYMBOL

EQUIVALENT CIRCUIT

1	MON			VP
2	MOP
			1.5	1.5
			kΩ	kΩ
		1
				from
				oscillator
				buffer
		2		MHB680
3	VCC	3	VCC
			MHB681
4	OSC		VP
5	OSE	4
		5

6 kΩ		1.2 V

MHB682

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