04/2003
ACD2204
CATV/TV/Video Downconverter
with Dual Synthesizer
PRELIMINARY DATA SHEET - Rev 1.0
Figure 1: Downconverter Block Diagram
FEATURES
Integrated Downconverter
Integrated Dual Synthesizer
256 QAM Compatibility
Single +5 V Power Supply Operation
Low Noise Figure: 8 dB
High Conversion Gain: 31 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 ACD2204 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, IF Amplifier, and
dual synthesizer. The specifications meet the
requirements of CATV/TV/Video and Cable Modem
Data applications. The ACD2204 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 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
V
IF
+
IF
OUT+
OSC
OUT
T
CKT
RF
IN
+
Phase Splitter
Low Noise
VGA
Mixer
RF
IN
-
V
IF
+
IF
OUT-
RF2: 64/65
Prescaler
18 Bit RF2
N C ounter
RF2
Phase
Detector
RF 2
Charge
Pump
RF1
Phase
Detector
RF1
Charge
Pump
15 Bit RF2
R C ounter
15 Bit RF1
R C ounter
18 Bit RF1
N C ounter
RF1: 64/65
Prescaler
Oscillato r
22 Bit
Data Registar
CP
U
CP
D
RF
D
REF
IN
REF
OU T
RF
U
Clock
Data
Enabl e
4
PRELIMINARY DATA SHEET - Rev 1.0
04/2003
ACD2204
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ELECTRICAL CHARACTERISTICS
Table 2: Absolute Minimum and Maximum Ratings
Stresses in excess of the absolute ratings may cause permanent damage.
Functional operation is not implied under these conditions. Exposure to absolute
ratings for extended periods of time may adversely affect reliability.
The device may be operated safely over these conditions; however, parametric
performance is guaranteed only over the conditions defined in the electrical
specifications.
Table 3: Operating Ranges
Notes:
(1) Mixer operation is possible beyond these frequencies with slightly reduced
performance.
PRELIMINARY DATA SHEET - Rev 1.0
04/2003
5
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Table 4: Electrical Specifications - Downconverter Section
(T
A
= 25
C, V
DD
= +5 VDC, RF
IN
= 1087 MHz, IF
OUT
= 45 MHz)
Notes:
(1) As measured in ANADIGICS test fixture.
(2) Two tones: 1085 and 1091 MHz, -40 dBm each, 1091 MHz tone AM-modulated 99% at 15 kHz.
(3) Two tones: 1085 and 1091 MHz, -30 dBm each.
(4) R1 = 0 Ohms
Table 5: Electrical Specifications - Synthesizer Section
(T
A
= +25
C, V
DD
= +5 VDC)
Notes:
(1) Measured at 250 kHz comparison frequency.
(2) Measured at 62.5 kHz comparison frequency.
(3) CP
U
and CP
D
= Vcc/2.
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