Conversion IC. CXA3685ER Datasheet
Direct Conversion IC for Digital Satellite Broadcast Tuner
The CXA3685ER is an IC developed for direct orthogonal detection of L band (1 to 2GHz) IF signals in a digital
satellite broadcast reception tuner.
This direct conversion (Zero-IF) technology eliminates the need for the SAW filter that was formerly necessary.
In addition, the CXA3685ER incorporates an RF gain control amplifier, oscillator circuit, wide-band phase
shifter circuit and other RF circuits, a baseband LPF, baseband gain control amplifier, tuning PLL, and the
inductor and varactor diode needed for a tuning VCO. This makes it possible to realize the front-end RF block
without tuning the RF circuits.
(Applications: BS/CS digital broadcast (ISDB-S) tuner)
Low power consumption: 430mW (typ.)
No need for an external inductor and varactor diode
3.3V single power supply
Reception frequency: 950MHz to 2150MHz
Wide input range (typ. –65dBm to –15dBm)
Internal wide band 90° phase shifter
Internal output for controlling an external attenuator
Reference signal output for the demodulation circuit
Enables to use external reference signals
Small package: 48-pin VQFN
Enables to reduce power consumption in power save mode when not used: 180mW (typ.)
48-pin VQFN (Plastic)
Note) This IC has pins whose electrostatic discharge strength is weak as the high-frequency process is used. Take care of
handling the IC.
Sony reserves the right to change products and specifications without prior notice. This information does not convey any license
by any implication or otherwise under any patents or other right. Application circuits shown, if any, are typical examples illustrating
the operation of the devices. Sony cannot assume responsibility for any problems arising out of the use of these circuits.
Absolute Maximum Ratings
AVCC, REFVCC, DVCC, OSCVCC, RFVCC –0.3 to +3.6
Tstg –55 to +150
V (Ta = 25°C)
AVCC, REFVCC, DVCC, OSCVCC, RFVCC 3.15 to 3.45
Operating temperature Topr
–10 to +70
950MHz to 2150MHz
IF output level
Crystal oscilaltor frequency 4MHz to 32MHz
3.15V to 3.45V
in power save mode