ACD2204
CATV/TV/Video Downconverter
with Dual Synthesizer
PRELIMINARY DATA SHEET - Rev 1.0
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.
RF
RF2: 64/65
Prescaler
18 Bit RF2
N C ounter
RF2
Phase
Detector
RF 2
Charge
Pump
D
CP
D
RF
IN
+
RF
IN
-
Low Noise
VGA
V
IF
+IF
OUT-
REF
REF
IN
15 Bit RF2
R C ounter
V
IF
+IF
OUT+
Mixer
OU T
Oscillato r
15 Bit RF1
R C ounter
Phase Splitter
RF
U
RF1: 64/65
Prescaler
18 Bit RF1
N C ounter
RF1
Phase
Detector
RF1
Charge
Pump
CP
U
T
CKT
OSC
OUT
Clock
Data
Enabl e
22 Bi t
Data Registar
Figure 1: Downconverter Block Diagram
04/2003
Figure 2: Dual Synthesizer Block Diagram
ACD2204
1
2
3
4
5
6
7
8
9
10
11
12
13
14
RF
IN+
RF
IN-
GND
I
SET
T
CKT
OSC
GND
OSC
GND
V
SS
V
SS
EN
DATA
CLK
REF
IN
REF
OUT
V
IF
+ IF
OUT+
V
IF
+ IF
OUT-
GND
V
SUP
OSC
OUT
GND
GND
V
SS
V
SS
RF
D
CP
D
CP
U
RF
U
V
SYN
Figure 3: Pinout
28
27
26
25
24
23
22
21
20
19
18
17
16
15
2
PRELIMINARY DATA SHEET - Rev 1.0
04/2003
ACD2204
Table 1: Pin Description
PIN
1
NAME
RF
IN+
DESCRIPTION
Downconverter
Differential RFInput
Downconverter
Differential RFInput
Downconverter Ground
(Must be connected)
Downconverter Gilbert
Cell Current Source
Resistor
Oscillator Input Port
(Tank circuit connection)
Oscillator Tank Circuit
Ground (Not to be
connected to any other
circuit ground)
Same as Pin 6
Synthesizer Ground
(Required)
Synthesizer Ground
(Required)
3-Wire Interface Enable
3-Wire Interface Data
3-Wire Interface Clock
Crystal Reference Input
Crystal Reference
Output
PIN
28
NAME
V
IF
+IF
OUT+
DESCRIPTION
Differential IF Amplifier
Output, Inductively
coupled to +V
DD
Differential IF Amplifier
Output, Inductively
coupled to +V
DD
Downconverter Ground
(Must be connected)
Downconverter Supply
(+V
DD
)
Oscillator Output
(Connected to
Synthesizer RF Input)
Downconverter Ground
(Must be connected)
Downconverter Ground
(Must be connected)
Synthesizer Ground
(Required)
Synthesizer Ground
(Required)
Synthesizer
Downconverter RFInput
Synthesizer
Downconverter
Charge Pump Output
Synthesizer Upconverter
Charge Pump Output
Synthesizer Upconverter
RFInput
Synthesizer Supply
(+V
DD
)
2
3
4
RF
IN-
GND
I
SET
27
26
25
V
IF
+IF
OUT
-
GND
V
SUP
5
T
CKT
24
OSC
OUT
6
OSC
GND
23
GND
7
8
9
10
11
12
13
14
OSC
GND
V
SS
V
SS
EN
DATA
CLK
REF
IN
REF
OUT
22
21
20
19
18
17
16
15
GND
V
SS
V
SS
RF
D
CP
D
CP
U
RF
U
V
SYN
PRELIMINARY DATA SHEET - Rev 1.0
04/2003
3
ACD2204
ELECTRICAL CHARACTERISTICS
Table 2: Absolute Minimum and Maximum Ratings
PARAMETER
Supply Voltage (pins 25, 27 & 28)
(pin 15)
Voltage on pins 10 through 14, 16
through 19 with V
SS
= 0 V
Input Voltages (pins 1, 2 & 5)
Input Power (pins 1 & 2)
(pin 5)
(pins 13, 16 & 19)
Storage Temperature
Soldering Temperature
Soldering Time
Thermal Impedance,
θ
JC
MIN
-
-
-0.3
-
-
-
-
-55
-
-
-
MAX
+9
+6.5
V
SYN
+0.3
0
+10
+17
+20
+150
260
4
40
UNIT
VDC
VDC
VDC
dBm
°C
°C
Sec
° C/W
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.
Table 3: Operating Ranges
PARAMETER
Downconverter Frequencies
RF Input (RF)
IF Output (IF)
Local Oscillator (LO)
(1)
MIN
900
35
865
400
400
2
-
+4.75
-40
TYP
-
-
-
-
-
4
-
+5
-
MAX
1200
150
1350
2100
1400
20
10
+5.25
+85
UNIT
MHz
Synthesizer Frequencies
Upconverter Synthesizer (RF
U
)
Downconverter Synthesizer (RF
D
)
Reference Oscillator (REF
IN
)
Phase Detector
Supply Voltage: V
DD
(pins 15, 25, 27, 28)
Ambient Operating Temperature: T
A
MHz
VDC
°C
The device may be operated safely over these conditions; however, parametric
performance is guaranteed only over the conditions defined in the electrical
specifications.
Notes:
(1) Mixer operation is possible beyond these frequencies with slightly reduced
performance.
4
PRELIMINARY DATA SHEET - Rev 1.0
04/2003
ACD2204
Table 4: Electrical Specifications - Downconverter Section
(T
A
= 25
°C,
V
DD
= +5 VDC, RF
IN
= 1087 MHz, IF
OUT
= 45 MHz)
PARAMETER
Conversion Gain
(1)
(1)
(1), (2), (4)
MIN
28
-
-
-
-10
-
-
-
-
-
-
-
-
-
TYP
31
8
-59
-
-
-90
-5
-10
-70
-50
-10
110
70
900
MAX
-
10
-
-53
-
-85.5
-
-
-
-
-
-
-
-
UNIT
dB
dB
dBc
dBc
dBm
dBc/Hz
dBm
dBm
dBc
dBm
dBm
mA
mA
mW
SSB Noise Figure
Cross Modulation
3
rd
Order Intermodulation Distortion
(IMD3)
(1), (3), (4)
2-Tone 3
rd
Order Input Intercept Point
(IIP3)
(1), (3), (4)
LO Phase Noise (@ 10 KHz Offset)
LO Output Power (pin 24)
(1)
(1)
Spurious @ IF Output
LO Signals and Harmonics
Beats Within Output Channel
Other Beats from 2 to 200 MHz
Other Spurious
IF Supply Current (pin 27 & 28)
(1), (4)
Osc, Phase Splitter and Mixer Supply
Current (pin 25)
Power Consumption
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)
PARAMETER
Prescalar Input Sensitivity
Upconverter: RF
U
(pin 16)
(1)
Downconverter: RF
D
(pin 19)
MIN
-7
-13
-
-
-
-
-
TYP
-
-
0.5
1.25
-1.25
35
165
MAX
+20
+20
-
-
-
50
250
UNIT
dBm
V
p-p
COMMENTS
(over operating frequency)
(2)
Reference Oscillator Sensitivity (pin 13)
Charge Pump Output Current
(3)
SINK
SOURCE
Supply Current
Power Consumption
Notes:
(1) Measured at 250 kHz comparison frequency.
(2) Measured at 62.5 kHz comparison frequency.
(3) CP
U
and CP
D
= Vcc/2.
mA
mA
mW
PRELIMINARY DATA SHEET - Rev 1.0
04/2003
5
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