ANALOG DEVICES UG-2049 Evaluating the ADCA5190 5 MHz to 1800 MHz Broadband CATV Amplifier User Guide
- June 3, 2024
- Analog Devices
Table of Contents
ANALOG DEVICES UG-2049 Evaluating the ADCA5190 5 MHz to 1800 MHz
Broadband CATV Amplifier
Evaluating the ADCA5190 5 MHz to 1800 MHz Broadband CATV Amplifier
FEATURES
- 2-layer evaluation board with heat sink
- 75 Ω N-type RF male connectors
EVALUATION KIT CONTENTS
- ADCA5190-EVALZ evaluation board
EQUIPMENT NEEDED
- RF signal generator
- RF spectrum analyzer
- DOCSIS signal generator
- DOCSIS signal analyzer
- RF network analyzer
- 8 V, 500 mA power supply
GENERAL DESCRIPTION
The ADCA5190-EVALZ evaluation board consists of a 2-layer printed circuit board (PCB) fabricated from a 62 mil laminate mounted to an aluminum heat sink. The heat sink assists in providing thermal relief to the device as well as mechanical support to the PCB. Mounting holes on the heat sink allow attachment to larger heat sinks for improved thermal management.
The ADCA5190-EVALZ is populated with components to interface the IC to a
typical cable TV (CATV) application. J1 (RF_IN) and J2 (RF_OUT) are 75 Ω,
N-type, male coaxial connectors. The respective RF traces of the ports have a
75 Ω characteristic impedance. The ADCA5190-EVALZ is populated with components
suitable for use over the −40°C to +100°C operating temperature range of the
ADCA5190.
Access to the supply voltage (VDD) and GND is through a 3-pin header (P1) on
the ADCA5190-EVALZ.
RF traces are 75 Ω microstrip at the input and output RF connectors. The
package ground leads and the exposed paddle connect directly to the ground
plane. Multiple vias connect the lead frame chip scale package (LFCSP) ground
paddle to the bottom ground plane to provide adequate electrical conduction
and thermal con-duction to the heat sink. The transfer of heat from the
ADCA5190-EVALZ ground to the heat sink is further facilitated by the insertion
of a piece of indium approximately the footprint of the LFCSP between the
ADCA5190-EVALZ bottom and the heat sink. There are no components on the bottom
side of the PCB.
Consult the ADCA5190 data sheet in conjunction with this user guide when using
the ADCA5190-EVALZ evaluation board.
ADCA5190-EVALZ PHOTOGRAPH (TOP SIDE)
Figure 1. ADCA5190-EVALZ Photograph (Top Side)
OPERATING THE ADCA5190-EVALZ
An 8 V, 500 mA power supply is required to provide the bias to the ADCA5190 on
the ADCA5190-EVALZ. Connect the positive terminal of the 8 V power supply to
the VDD pin on P1 and the ground terminal to the GND pin.
The bias current (IDD) of the ADCA5190 can be controlled by adjusting the
voltage of the VADJ pin on connector P1. Figure 2 shows the typical IDD vs.
VADJ voltage. Setting VADJ is optional, and the pin can be left floating. If
VADJ is left floating, see the ADCA5190 data sheet for the typical dc supply
current to expect
when powering up the VDD supply.
Figure 2. IDD vs. VADJ
RECOMMENDED BIAS SEQUENCES
During Power-Up
The recommended bias sequence during power-up follows:
- Set VADJ to ≤0 V to limit IDD at power-up. Note that VADJ is optional and can be left floating to have the typical IDD.
- Set VDD to 8.0 V.
- Increase the VADJ setting as needed to adjust IDD to the desired level. See Figure 2.
- Apply the RF signal.
During Power-Down
The recommended bias sequence during power-down follows:
- Turn off the RF signal.
- Set VADJ to 0 V.
- Set VDD to 0 V.
Table 1. Header Connections
RF Measurements
To evaluate the ADCA5190, connect a 75 Ω RF signal source to the N-type, male
connector (J1), which can be a single-tone or multitone source for distortion
measurements, or a wideband data over cable service interface specification
(DOCSIS) signal source for analyzing modulation error ratio (MER) or bit error
rate (BER) measurements. The input power must be <51 dBmV to produce an output
power of <70 dBmV to support DOCSIS 3.0, DOCSIS 3.1, and DOCSIS 4.0
applications. The 75 Ω RF output signal is available on the N-type, male
connector (J2) and can be interfaced directly to instruments (such as a
spectrum analyzer or vector network analyzer) with a 75 Ω input impedance.
EVALUATION BOARD SCHEMATIC AND ASSEMBLY DRAWINGS
Figure 3. ADCA5190-EVALZ Evaluation Board Schematic 
Figure 4. ADCA5190-EVALZ Assembly Drawing (Top Side)
EVALUATION BOARD SCHEMATIC AND ASSEMBLY DRAWINGS
Figure 5. ADCA5190-EVALZ Assembly Drawing (Bottom Side, No
Components)
EVALUATION BOARD SCHEMATIC AND ASSEMBLY DRAWINGS
ADCA5190-EVALZ ASSEMBLY INFORMATION
The PCB for the ADCA5190-EVALZ is assembled using normal manufacturing
practices, excluding the J1 and J2 connectors, and the custom external
aluminum heat sink. Once the PCB is assembled, it is mounted with 10 screws to
the external heat sink as shown in Figure 6. The transfer of heat from the
ADCA5190-EVALZ ground to the heat sink is enhanced by the insertion of a thin
sheet of indium cut to approximately the footprint of the ADCA5190 and located
between the via array on the bottom of the PCB (underneath the ADCA5190) and
the heat sink. The J1 and J2 connectors are then mounted to the heat sink
using two screws for each (see Figure 7). Then, the center conductor for the
RF connectors is soldered to the PCB. Once complete, the ADCA5190-EVALZ is
ready for testing.
Figure 6. ADCA5190-EVALZ Top Side, Fully Assembled
Figure 7. ADCA5190-EVALZ Side View
ORDERING INFORMATION
BILL OF MATERIALS
Table 2. Bill of Materials1
Reference Designator Value Tolerance Minimum Rating Footprint Suggested Vendor Suggested Part Number
| C3 | 0.2 pF | ±0.1 pF | 100 V | 0402 | Murata | GRM1555C2AR20BA01D |
|---|---|---|---|---|---|---|
| C4, C16, C25, C26 | 0.01 µF | 10% | 100 V | 0402 | TDK | 810-C1005X7S2A103K |
| C6 | 0.01 µF | 10% | 50 V | 0201 | Taiyo Yuden | UMK063BJ103KP-F |
| C10, C12 | 2.2 µF | 10% | 50 V | 1411 | Kyocera AVX | TAJB225K050RNJ |
| C11 | 0.01 µF | 20% | 100 V | 0603 | TDK | C1608X7R2A103M080AA |
| C15 | 0.047 µF | 10% | 50 V | 0603 | TDK | 06035C473KAT4A |
| C27, C28 | 180 pF | 1% | 50 V | 0402 | Murata | GRT1555C1H181FA02D |
| C28, C29 | 220 pF | 10% | 50 V | 0201 | Murata | GRM033R71H221KA12D |
| D1 | 2.5V | 0.2% | 15 mA | SOT-23-3 | Analog Devices, | ADR5041ARTZ |
| Inc. | ||||||
| E1 | 1000 Ω ferrite | 25% | 170 mA | 0201 | Murata | BLM03BX102SN1D |
| E2 | 220 Ω ferrite | 25% | 1.8 A | 0603 | Taiyo Yuden | FBMH1608HM221-T |
| J1, J2 | 75 Ω | N/A | N/A | N/A | Pasternack | PE4504 |
| L1 | 2.2 µH | 20% | 1.6 A | 1210 | Taiyo Yuden | BRL3225T2R2M |
| L2, L3 | 270 nH | 5% | 590 mA | 0402 | Coilcraft | 0402DF-271XJRW |
| L8, L10, L11, R11, R12 | 0 Ω | N/A | 0.1 W | 0402 | Panasonic | ERJ-2GE0R00X |
| L9 | 1.5 nH | 0.2 nH | 2.1 A | 0402 | Murata | LQW15AN1N5C8ZD |
| P1 | 3-pin header | N/A | N/A | 3 x 2.54 mm | Molex | 087898-0306 |
| R3 | 1 kΩ | 1% | 0.1 W | 0402 | Panasonic | ERJ-2RKF1001X |
| R4, R6 | 2.0 kΩ | 1% | 100 mW | 0402 | Panasonic | ERJ-2RKF2001X |
| R5 | 3.3 kΩ | 1% | 100 mW | 0402 | Panasonic | ERJ-2RKF3301X |
| R8 | 2.0 kΩ | 1% | 50 mW | 0201 | Panasonic | ERJ-1GNF2001C |
| T1 | 1:1 transformer | N/A | N/A | AT224-3 | Mini-Circuits | TC1-33-75G2+ |
| T2 | 1:1 transformer | N/A | N/A | 99-01-1618-2 | Mini-Circuits | TRS1-182-75-3+ |
| U1 | CATV amplifier | N/A | N/A | 5 mm × 5 mm, 32- | Analog Devices | ADCA5190 |
| lead LFSCP | ||||||
| C1, C2, C5, C7, C8, | Do not install | N/A | N/A | N/A | N/A | Do not install |
| C9, C13, C14, C17, | ||||||
| C18, C20, C21, C22, | ||||||
| C23, C24, E3, L4, L5, | ||||||
| L6, L7, R1, R7, R9, | ||||||
| R10, R14, R16, R18, | ||||||
| R19 |
1 N/A means not applicable.
ESD Caution
ESD (electrostatic discharge) sensitive device. Charged devices and circuit
boards can discharge without detection. Although this product features
patented or proprietary protection circuitry, damage may occur on devices
subjected to high energy ESD. Therefore, proper ESD precautions should be
taken to avoid performance degradation or loss of functionality.
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References
- Mixed-signal and digital signal processing ICs | Analog Devices
- EVAL-ADCA5190 Evaluation Board | Analog Devices
- ADCA5190 Datasheet and Product Info | Analog Devices
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