Overview
The TDA18250BHN/C1557 is a cable silicon tuner produced by NXP USA Inc. This integrated circuit is designed to optimize system cost and performance in cable TV and other broadcast reception applications. It integrates several key components, including low-noise amplifiers, surface acoustic wave (SAW) filters, and a crystal oscillator, thereby reducing the need for external components. The device is RoHS compliant and features an I2C-bus interface compatible with 3.3 V microcontrollers, making it versatile for various system designs.
Key Specifications
| Parameter | Conditions | Min | Typ | Max | Unit |
|---|---|---|---|---|---|
| RF Frequency Range | - | 42 | - | 1002 | MHz |
| Tuner Noise Figure (NFtun) | fRF < 862 MHz | - | 3.8 | - | dB |
| Tuner Noise Figure (NFtun) | fRF ≥ 862 MHz | - | 4.1 | - | dB |
| Phase Jitter (φjit) | Integrated from 250 Hz to 4 MHz | 0.4 | 0.6 | - | Degree |
| Image Rejection | IF = 5 MHz, RF (image) level ≥60 dBμV | - | - | 62 | dB |
| Maximum Input Power (Pi(max)) | - | - | - | 115 | dBμV |
| Power Dissipation (P) | - | - | - | 0.740 | W |
| Supply Voltage (VCC) | - | -0.3 | - | 3.60 | V |
| Electrostatic Discharge Voltage (VESD) | EIA/JESD22-A114 (HBM); pins RF_IN and LT | - | - | 8 | kV |
Key Features
- Flexible low IF output from 3 MHz to 7.5 MHz to ease matching with various demodulators.
- RoHS compliant.
- I2C-bus interface compatible with 3.3 V microcontrollers.
- Strong immunity to wireless interferers (WLAN, GSM, LTE).
- Multi-reference clock frequency compliant: 16 MHz, 24 MHz, 25 MHz, 27 MHz, and 30 MHz.
- Crystal oscillator output buffer to drive demodulator, SoC, or slave tuner.
- Slave Tuner Output (STO), integrated splitter for dual tuner applications.
- Fully integrated oscillators.
- Single-ended RF input (no need for external balun).
- Enhanced ESD protection (8 kV HBM) on RF_IN and LT pins.
- Alignment free.
- Excellent return loss compatible with cable requirements.
- Integrated RSSI function, readable through I2C-bus.
- Integrated temperature sensor.
- Integrated gain control.
Applications
The TDA18250BHN/C1557 is primarily used in cable TV and broadcast reception systems. It is suitable for various applications including:
- Cable TV set-top boxes and digital video recorders.
- Hybrid cable and IP-based TV systems.
- Multi-tuner systems for simultaneous channel reception.
- Other broadcast reception devices requiring high-performance tuning capabilities.
Q & A
- What is the RF frequency range of the TDA18250BHN/C1557?
The RF frequency range is from 42 MHz to 1002 MHz. - Is the TDA18250BHN/C1557 RoHS compliant?
Yes, it is RoHS compliant. - What is the typical tuner noise figure for frequencies below 862 MHz?
The typical tuner noise figure is 3.8 dB for frequencies below 862 MHz. - What is the phase jitter of the TDA18250BHN/C1557?
The phase jitter is 0.4 to 0.6 degrees integrated from 250 Hz to 4 MHz. - Does the TDA18250BHN/C1557 have integrated ESD protection?
Yes, it has enhanced ESD protection (8 kV HBM) on RF_IN and LT pins. - What is the power dissipation of the TDA18250BHN/C1557?
The power dissipation is up to 0.740 W. - Can the TDA18250BHN/C1557 be used in dual tuner applications?
Yes, it has an integrated splitter for dual tuner applications. - Is the TDA18250BHN/C1557 compatible with 3.3 V microcontrollers?
Yes, it has an I2C-bus interface compatible with 3.3 V microcontrollers. - What are the supported reference clock frequencies?
The supported reference clock frequencies are 16 MHz, 24 MHz, 25 MHz, 27 MHz, and 30 MHz. - Does the TDA18250BHN/C1557 have an integrated temperature sensor?
Yes, it has an integrated temperature sensor.
