Philips SA9504 Datasheet

INTEGRATED CIRCUITS

SA9504

Dual-band, PCS(CDMA)/AMPS LNA and downconverter mixers

Preliminary specification Supersedes data of 1999 Aug 24

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1999 Oct 28

Philips Semiconductors Preliminary specification

Dual-band, PCS(CDMA)/AMPS LNA and downconverter mixers

DESCRIPTION

The SA9504 is an integrated receiver front-end for 900 MHz Cellular (AMPS) and 1.9 GHz PCS (CDMA) phones. This dual-band receiver circuit has low noise amplifiers and downconverters for both bands, and provides an elegant solution for RF-to-IF conversion.

The two cascode LNAs have been designed to provide high gain with very low noise figures and high linearity. The downconverter portion is based on the Philips SA9502. There are two individual mixer blocks, each optimized for low noise figure and high linearity. The whole circuit is designed for low power consumption, high performance, and is compatible with the requirements for Cellular (AMPS) and PCS (CDMA) handsets.

The circuit has been designed in our advanced QUBiC3 BiCMOS process with 30 GHz f

FEATURES LNA typical performance

PARAMETER Cellular LNA PCS (CDMA) LNA

Gain (dB) 16.5 14.8 Noise figure (dB) 1.6 2 Input IP3 (dBm) –2 1 Current (mA) 4.9 4.9

•LNAs for both Cellular (AMPS) and PCS (CDMA) bands

•High gain, low noise figure, high linearity performance

•Cascode output structure requiring no external matching

•Low power consumption, typical 4.9 mA

•Low voltage operation down to 2.7 volts

and 60 GHz f

MAX

SA9504

Downconverter typical performance

PARAMETER Cellular FM PCS (CDMA)

Gain (dB) 7.5 11.5 Nois e Figure ( dB) 10 9 Input IP3 (dBm) 5 4 Current (mA)

(Tx) LO output buffer off

•Separate, selectable IF outputs to suit FM and CDMA bandwidths

•Buffered Cellular and PCS LO inputs

•Integrated frequency doubler for PCS mixer LO

•Differential (Tx) LO output buffer (can be switched on or off)

•Low voltage operation down to 2.7 volts

•Mixers current consumption with (Tx) LO buffer on:

– Cellular FM: 17.4 mA – PCS: 27.6 mA

•Low standby current in sleep mode: <50 µA

•Small LQFP32 package

APPLICATIONS

•800 MHz analog FM and receivers

•1.9 GHz PCS (CDMA) digital receivers

•Supports dual-band operation

•Digital mobile communications equipment

•Portable, low power radio equipment

6.9 17

1999 Oct 28

Philips Semiconductors Preliminary specification

PARAMETER

TEST CONDITIONS

UNIT

Dual-band, PCS(CDMA)/AMPS LNA and downconverter mixers

BLOCK DIAGRAM

RF_PCS

SA9504

RF_CEL

RX BPF Fo = 1960 MHz BW = 60 MHz

PCS_INPCS_OUT

SA9504

PCS IF BPF

×2

CELLULARPCS

PCS_IF

FM_IF

BW = 1.23MHz

FM IF BPF BW = 30kHz

MODE

SELECT

LOGIC

LO_X2_EN PCS/CELLULAR S0 S1

SR02107

CEL_OUT

CEL_IN

RX BPF Fo = 881.5MHz BW = 25 MHz

BIAS

CTRL

LO_OUT

LO_ENABLE CEL

LO_IN

PCS

LO_IN

Figure 1. SA9504 Block Diagram

ABSOLUTE MAXIMUM RATINGS

PARAMETER

RATINGS UNIT

Supply voltage (VCC) –0.3 to +3.6 V Logic input voltage –0.3 to VCC+0.3 V Maximum power input +20 dBm Power dissipation (T

= 25°C) 800 mW

amb

Storage temperature range –65 to +150 °C

NOTES:

1. Stresses beyond those listed may cause permanent damage to the device. These are stress ratings only and functional operation of the device at these or any other conditions beyond those indicated under “Recommended Operating Conditions” is not implied. Exposure to absolute-maximum-rated-conditions for extended periods may affect device reliability.

RECOMMENDED OPERATING CONDITIONS

LIMITS

MIN TYP MAX

Supply voltage (VCC) 2.7 2.85 3.3 V Operating ambient temperature range (T

) –40 +85 °C

amb

1999 Oct 28

Philips Semiconductors Preliminary specification

Dual-band, PCS(CDMA)/AMPS LNA and downconverter mixers

FUNCTIONAL DESCRIPTION Mode selection

The SA9504 has several modes of operation for which the selection logic is defined in Table 1. Different mode selections require different portions of the circuit to be active. Modes from unlisted combinations of logic pins are not permitted. The LNA and downconverter together can be programmed to operate in the PCS or cellular bands using the PCS/CEL logic input pin.

In order for the SA9504 to function correctly, a reset must be applied on first power-up. The whole circuit (LNAs and mixers) is powered down when control lines S0 and S1 are simultaneously held HIGH. An internal reset is applied upon releasing the circuit from power-down (on taking S0 = S1 from HIGH to LOW).

LNA

The SA9504 has two LNAs, one for cellular FM, and one for PCS (CDMA). The LNAs have been designed for high gain, low noise figure and good linearity with low power consumption. External components can be used to match the LNA inputs for the Cellular and PCS bands. The LNAs employ a cascode output structure allowing high gain and excellent reverse isolation. The LNA outputs are internally matched to drive 50Ω external loads. The input and output return loss of better than 10 dB can be achieved in all modes.

Downconverter

The SA9504 has two mixers, one for Cellular FM, and one for PCS (CDMA). Each mixer is individually optimized for its specific

SA9504

requirements. The Cellular FM mixer has a common single-ended RF input. The PCS mixer’s RF input port is differential, and requires an external balun when used with a single-ended source. Both the PCS and the Cellular mixer RF inputs should be AC coupled.

Local oscillator drive for the mixers is provided through pins CEL LO_IN and/or PCS LO_IN. The local oscillator inputs are single-ended, AC-coupled. The CEL LO_IN signal is internally buffered to drive the following: – (Tx) LO output buf fer,

– cellular FM mixer, – PCS LO frequency doubler.

In the PCS mode, mixer LO drive can be either direct (PCS LO_IN) or through the frequency doubler after CEL LO_IN. The mixer local oscillator signal is made available externally via the (Tx) LO output buffer for potential use elsewhere in the radio. For example, this signal typically can be used with the transmitter circuitry. The (Tx) LO output buffer can be powered down independently, using the (Tx) LO_ENABLE logic input. The (Tx) LO output buffer has open collector differential outputs which should be externally biased to power supply rail.

The PCS and Cellular FM mixers have open collector differential IF outputs. The differential IF outputs must be biased at the supply voltage through external inductors that may also be part of the matching circuit to the SAW filter .

1999 Oct 28

Philips Semiconductors Preliminary specification

(Tx) LO

SYMBOL

PARAMETER

CONDITIONS

UNIT

Dual-band, PCS(CDMA)/AMPS LNA and downconverter mixers

MODE SELECT LOGIC AND DC CHARACTERISTICS

The SA9504 chip has several modes of operation for which the selection logic is defined in the following table. Different mode selections require different portions of the circuit to be active. Modes from unlisted combinations of logic pins, are not valid.

Table 1. Mode logic definition for LNA and Downconverter mixers

MODES

PCS (CDMA)

1 PCS1 On 2 GHz Off 0 1 0 1 2 PCS1 Idle Off — Off 0 1 0 0 3 PCS2 On 2 GHz On 0 1 1 1 4 PCS2 Idle Off — On 0 1 1 0

Cellular FM

5 FM On 1 GHz Off 0 0 0 1 6 FM Idle Off — Off 0 0 0 0

Power Down

7 Sleep

NOTES:

x = Don’t care

1. The device will be in the Power Down mode (sleep) when both control lines S0 and S1 are held HIGH simultaneously.

(Tx) LO

BUFFER

x x Off 1 x x x

BUFFER OUTPUT

LO FREQ. DOUBLER

POWER-UP PROCEDURE

In order for the SA9504 to function correctly as given in Table 1, the circuit must be reset on power-up as follows:

To apply a reset, both S0 and S1 should be held HIGH simultaneously (hold time 100 ns minimum), and then released to a LOW state upon initially powering up the device.

LOGIC INPUT PINS

POWER DOWN

S0 = S1

PCS/CEL

LO X2

ENABLE

SA9504

(Tx) LO

ENABLE

DC CHARACTERISTICS

VCC = 3.3 V; T

Power supply

CC(PD)

Logic inputs (LO_ENABLE, PCS/CEL, S0, S1, LO_X2_EN pins)

= +25 °C

amb

Supply voltage all modes 2.7 2.85 3.3 V Supply current

Supply current in power down Sleep 1 50 µA

HIGH level input voltage range At logic 1 0.5V LOW level input voltage range At logic 0 –0.3 0.2V HIGH level input bias current pins at VCC – 0.4 V –5 0 5 µA LOW level input bias current pins at 0.4 V –5 0 5 µA

PCS1 mode 32.5 37.4 mA

PCS1 Idle mode 21.9 25.2 mA

PCS2 mode 36.9 42.4 mA

PCS2 Idle mode 26.3 30.2 mA

FM mode 22.3 25.6 mA

FM Idle mode 11.8 13.8 mA

LIMITS

MIN TYP MAX

VCC+0.3 V

1999 Oct 28

Philips Semiconductors Preliminary specification

in ut isolation

and without doubler. 0 dBm LO in, (Tx) LO

SPECIFICATION

CONDITIONS

UNIT

Dual-band, PCS(CDMA)/AMPS

SA9504

LNA and downconverter mixers

LNA

AC ELECTRICAL CHARACTERISTICS

VCC = 2.7 V; T

Cellular band LNA

RF input frequency range 869 894 MHz Gain 15.5 16.5 17.5 dB Noise Figure 1.6 1.9 dB Input IP3

S11 With external matching –10 dB S22 –15 dB S12 –40 dB LO (input and output) to LNA

input isolation All modes

PCS band LNA

RF input frequency range 1810 1990 MHz Gain 13.8 14.8 16 dB Noise Figure 2.0 2.4 dB Input IP3 2 tones of –30 dBm each, ∆f=800 kHz 0 1.5 dBm S11 With external matching –9 dB S22 –12 dB S12 –40 dB LO (input and Output) to LNApLO single-ended in, single-ended out, with

= 25°C

amb

PARAMETER TEST CONDITIONS

2 tones of –30 dBm each, ∆f=60 kHz –7 –6 dBm 2 tones of –30 dBm each, ∆f=800 kHz –3 –1.5 dBm

LO single-ended in, single-ended out, with and without doubler. 0 dBm LO in, (Tx) LO buffer ON.

MIN

–3σ

LIMITS

TYP +3σ MAX

40 dB

36 dB

UNIT

buffer ON.

TYPICAL LNA SPECIFICATIONS WITH TEMPERATURE VARIATION A T –40°C AND +85°C

VCC = 2.7 V

TEMPERATURE

–40°C +25°C +85°C

Cellular band LNA

Supply current variation –100 0 –100 µA Gain variation 1 0 –1 dB Noise Figure variation –0.3 0 0.3 dB Input IP3 variation ∆f = 60 kHz –0.35 0 0.3 dBm

PCS band LNA

Supply current variation –40 0 –40 µA Gain variation 0.8 0 –1 dB Noise Figure variation –0.4 0 0.4 dB Input IP3 variation 0.9 0 –1 dBm

1999 Oct 28

Philips Semiconductors Preliminary specification

PARAMETER

TEST CONDITIONS

UNIT

Dual-band, PCS(CDMA)/AMPS

SA9504

LNA and downconverter mixers

DOWNCONVERTER

AC ELECTRICAL CHARACTERISTICS

VCC = 2.7 V; T f

= 881 MHz, fLO = 966.4 MHz, fIF = 85.4 MHz, output differential load of 850Ω for FM.

Cellular band downconverter

RF input frequency range 869 894 MHz LO input frequency range 950 1030 MHz IF output frequency range 50 300 MHz IF Output Load Impedance Single-ended, with external balun 850 Ω Conversion Gain 6.5 7.5 8.2 dB Noise Figure Single sideband Noise Figure 10 11 dB Input IP3 P1, P2 = –24 dBm.

RF Input Return Loss ZS=50Ω with external matching 11.0 dB LO Input Return Loss ZS=50Ω 10.0 dB (Tx) LO Output Return Loss ZS=50Ω 8.0 dB LO Input Power Range –9 –6 0 dBm (Tx) LO Output Power Range ZL=50Ω single-ended; (Tx) LO buffer ON. –6 –3 0 dBm LO (Input and Output) to RF Leakage Single-ended in, single-ended out. –30 dBm LO (Input and Output) to IF Leakage Single-ended in, differential out. –20 dBm RF to LO (Input) Isolation Single-ended in, single-ended out 30 dB RF to IF Isolation Single-ended in, differential out 10 dB (Tx) LO Output to LO Input Isolation Single-ended in, differential out 30 dB Leakage conversion gain f1 = fRX ± 40 MHz at LNA input.

= 25°C, Plo= –3 dBm.

amb

Tone spacing = 60 kHz

P1 = – 70 dBm. Measured through conversion gain in

stop-band, without SAW filters being connected. Ports terminated with 50Ω.

MIN

LIMITS

TYP

–3s

5.0 dBm

–40 dBc

+3s

MAX

1999 Oct 28

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