12/2003
ACD2202
CATV/TV/Video Downconverter
with Dual Synthesizer
Data Sheet - Rev 2.1
Figure 1: Downconverter Block Diagram
FEATURES
• Integrated Downconverter
• Integrated Dual Synthesizer
• 256 QAM Compatibility
• Single +5 V Power Supply Operation
• Low Power Consumption: <0.6 W
• Low Noise Figure: 8 dB
• High Conversion Gain: 10 dB
• Low Distortion: -53 dBc
• Three-Wire Interface
• Small Size
• -40 °C to +85 °C
APPLICATIONS
• Set Top Boxes
• CATV Video Tuners
• Digital TV Tuners
• CATV Data Tuners
• Cable Modems
S8 Package
28 Pin SSOP
PRODUCT DESCRIPTION
The ACD2202 uses both GaAs and Si technology
to provide the downconverter and dual synthesizer
functions in a double conversion tuner gain block,
local oscillator, balanced mixer and dual synthesizer.
The specifications meet the requirements of
CATV/TV/Video and Cable Modem Data applications.
The ACD2202 is supplied in a 28 lead SSOP
package and requires a single +5 V supply voltage.
The IC is well suited for applications where small
size, low cost, low auxiliary parts count and a no-
compromise performance is important. It provides
for cost reduction by lowering the component and
packaged IC count and decreasing the amount of
labor-intensive production alignment steps, while
significantly improving performance and reliability.
Figure 2: Dual Synthesizer Block Diagram
RF2: 64/65
Prescaler
18 Bit RF2
N Counter
RF2
Phase
Detector
RF2
Charge
Pump
RF1
Phase
Detector
RF1
Charge
Pump
15 Bit RF2
R Counter
15 Bit RF1
R Counter
18 Bit RF1
N Counter
RF1: 64/65
Prescaler
Oscillator
22 Bit
Data Registar
CPU
CPDRFD
REFIN
REFOUT
RFU
Clock
Data
Enable
VIF+IFOUT+
OSC OUTTCKT
RFIN+
Phase Splitter
Low Noise
VGA
Mixer
RFIN-
VIF+IFOUT-