Overview
The HMC685LP4E is a high dynamic range passive MMIC (Monolithic Microwave Integrated Circuit) mixer with an integrated LO (Local Oscillator) amplifier, designed and manufactured by Analog Devices Inc. This component is housed in a 4x4 mm SMT (Surface Mount Technology) QFN package and operates within the frequency range of 1.7 to 2.2 GHz. It is particularly optimized for low side LO input and supports both upconversion and downconversion applications. The mixer is known for its excellent input IP3 (Third-Order Intercept Point) performance of +35 dBm, making it suitable for various wireless communication systems such as 3G, LTE, WiMAX, and 4G GSM/CDMA applications.
Key Specifications
| Parameter | Min. | Typ. | Max. |
|---|---|---|---|
| Frequency Range, RF | 1.7 GHz | - | 2.2 GHz |
| Frequency Range, LO | 1.5 GHz | - | 2.2 GHz |
| Frequency Range, IF | DC | - | 500 MHz |
| Conversion Loss | 8 dB | 10 dB | 8 dB |
| Noise Figure (SSB) | 8 dB | 8 dB | 8 dB |
| LO to RF Isolation | 22 dB | 30 dB | 34 dB |
| LO to IF Isolation | 24 dB | 30 dB | 32 dB |
| RF to IF Isolation | 30 dB | 42 dB | 43 dB |
| IP3 (Input) | 35 dBm | 34 dBm | 32 dBm |
| 1 dB Compression (Input) | 25 dBm | 24 dBm | 23 dBm |
| LO Drive Input Level (Typical) | -6 dBm | - | +3 dBm |
| Supply Current Icc total | 120 mA | 140 mA | 70 mA |
Key Features
- High dynamic range passive MMIC mixer with integrated LO amplifier.
- Operates within the frequency range of 1.7 to 2.2 GHz.
- Excellent input IP3 performance of +35 dBm.
- Conversion loss of 8 dB typical.
- Adjustable supply current (Icc total: 120 mA, 140 mA, 90 mA, 70 mA).
- 24-lead 4x4 mm SMT QFN package.
- Optimized for low side LO input and supports both upconversion and downconversion applications.
- High input 1 dB compression of +27 dBm.
Applications
- Cellular/3G & LTE/WiMAX/4G systems.
- Basestations and Repeaters.
- GSM, CDMA, and OFDM applications.
- Transmitters and Receivers.
Q & A
- What is the frequency range of the HMC685LP4E?
The HMC685LP4E operates within the frequency range of 1.7 to 2.2 GHz for RF, 1.5 to 2.2 GHz for LO, and DC to 500 MHz for IF.
- What is the typical conversion loss of the HMC685LP4E?
The typical conversion loss is 8 dB.
- What is the input IP3 performance of the HMC685LP4E?
The input IP3 performance is +35 dBm.
- What is the package type and size of the HMC685LP4E?
The component is housed in a 24-lead 4x4 mm SMT QFN package.
- What are the typical supply current values for the HMC685LP4E?
The supply current values are 120 mA, 140 mA, 90 mA, and 70 mA.
- What are the key applications of the HMC685LP4E?
The key applications include cellular/3G & LTE/WiMAX/4G systems, basestations, repeaters, GSM, CDMA, OFDM, and transmitters and receivers.
- Is the HMC685LP4E still in production?
No, the HMC685LP4E is no longer manufactured and is listed as obsolete.
- What is the characteristic impedance of the HMC685LP4E?
The characteristic impedance is 50 ohms.
- How does the HMC685LP4E perform in terms of LO to RF isolation?
The LO to RF isolation is typically 30 dB, with a minimum of 22 dB and a maximum of 34 dB.
- What is the typical noise figure of the HMC685LP4E?
The typical noise figure is 8 dB.
