MITEL SATURN, SATURNKG, SATURNQP1S, SATURNQP1T Datasheet

Preliminary Information SATURN

SATURN

CDMA/AMPS dual Band IF Receiver for Digital Phones

Preliminary Information

Description

The SATURN circuit is designed for use in dual band dual mode mobile phones (CDMA/AMPS). The circuit is designed to be compataible with digital baseband and mixed signal circuit chips from Mitel (Planet Chip-set) and Qualcomm (MSM2 and BBA). A wideband AGC amplifier allows the input of CDMA or AMPS signal paths with a range power management control options.

Features

● Selectable IF input buffers with characteristic

impedance suitable for interface to IF CDMA and FM SAW filter outputs

● AGC amplifiers with 90dB of variable gain, fully

compensated for temperature variation

● IQ demodulator with accurately defined output DC

level and low DC offsets

● LO operating at twice frequency with high accuracy

quadrature generation

● Sophisticated power management control operation

● Overload indicator

DS4721 Issue 4.2 April 1999

Odering Information

SATURN/KG/QP1S SATURN/KG/QP1T

Figure 1 Block diagram

Temperature

Comp.

DLL

I OUT

IF OUT

FM IFIN

Q OU T

Gain

Control

Mode

Control

CDMA IFIN

AGC

STARTUP

ENABLE

MODE CDM

VHF BUF

VHF RES

PRESCALER

Overload Indicator

OVERLOAD DET

BAND 1900

VHF VCC

VHF VEE

IF VCC

IF VEE

SATURN Preliminary Information

Figure 2 Pin Connections

QSOP28

IF VCC

IF OUTB

IF OUT

IF VEE

GND

CDMA IFIN

CDMA IFINB

FM IFIN

FM IFINB

AGC

AGCB

MODE CDMA

ENABLE

GND

VHF VCC I OUTB I OUT VHF VEE OVERLOAD DET VHF RES VHF RESB BAND 1900 VHF BUF VHF BUFB GND Q OUT Q OUTB STARTUP

Pin Description

Pin No Pin Name Description

1 IF VCC Supply for IF inputs and AGC blocks 2 IF OUTB Post AGC IF output 3 IF OUT Post AGC IF output 4 IF VEE Ground for IF inputs and AGC blocks 5 GND Substrate ground 6 CDMA IFIN Post SAW IF input (CDMA) 7 CDMA IFINB Post SAW IN input (CDMA) 8 FM IFIN Post SAW IF input (FM)

9 FM IFINB Post SAW IF inputs (FM) (AC ground) 10 AGC AGC Control for IF section 11 AGCB AGC control for IF sections (AC ground) 12 MODE CDMA CDMA/FM mode select 13 ENABLE Power up AGC sections of device 14 GND Substrate Ground 15 STARTUP Power up Oscillator, DLL and Mixer sections of the device 16 QOUTB Q channel baseband output 17 OUT Q Channel baseband output 18 GND Ground 19 VHF BUFB VHF oscillator buffered output for synthesiser 20 VHF BUF VHF oscillator buffered output for synthesiser 21 BAND 1900 VHF oscillator tuning band select input 22 VHF RESB VHF VCO resonator 23 VHF RES VHF VCO resonator 24 OVERLOAD DET Overload detector output 25 VHF VEE Ground for VHF VCO and DLL blocks 26 I OUT I channel baseband output 27 I OUTB I channel baseband output 28 VHF VCC Supply for VHF and DLL blocks

Preliminary Information SATURN

Electrical Characteristics (Mode Control)

Description ENAVLE STARTUP MODE CDMA BAND 1900 Conditions

Standby Mode 0 0 X X All circuits powered down

except logic inputs

Start up Mode 0 1 X 1 For high band IF

(210.38MHz)

0 1 X 0 For low band IF (85.38MHz)

Turns on VCO circuits, DLL quadrature generation, prescaler and IQ demodulator. All other circuits remain powered down

CDMA mode 1 1 1 1 For high band IF

(210.38MHz)

1 1 1 0 For low band IF (85.38MHz)

All circuits operational except for IF output buffer, CDMA input stage selected.

FM Mode 1 1 0 0 All circuits operational

except for IF output buffer,

FM input stage selected. Alternative FM mode 1 1 0 1 Note 4 CDMA IF AGC 1 0 1 X Demodulator and LO

only mode generation circuitry powered

down. IF output buffer

enabled FM IF AGC 1 0 0 X Demodulator and LO

generation circuitry powered

down. IF output buffer

enabled. X = Don’t Care

Notes

1. STARTUP mode is provided to allow VCO/DLL/prescalers to stabilise before signal path is activated. This is a power-saving

feature since the signal path is redundant during this period. If this feature is not required, the ENABLE and STARTUP control pins can be shorted together so that all circuitry is activated at the same time.

2. In high band mode (Band 1900 = 1) the VCO operates at twice the IF frequency. For example if IF = 210.38MHz then the

oscillator operates at 420.76MHz. A delay locked loop (DLL) circuit then generates the quadrature LO signals. The prescaler output, VHFBUF, is VCO frequency divided by 8 (52.494MHz).

3. In low band mode (Band 1900 = 0) the VCO operates at 4 times the IF frequency. for example if IF = 85.38MHz the oscillator

operates at 341.52MHz. This is then divided and uses DLL circuit to provide the quadrature LO signals. The prescaler output, VHFBUF, is VCO frequency divided by 8 (42.69MHz).

4 This mode can be used for FM. The VCO operates at twice the LO frequency. This mode is not normally used as a large

tuning range is required on the VCO. Prescaler output is LO frequency divided by four.

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