Overview
The SA639DH,512 is a low-voltage, high-performance monolithic FM IF (Intermediate Frequency) system produced by NXP USA Inc. This component is designed for high-bandwidth portable communication applications and operates at voltages as low as 2.7 V. It integrates a mixer/oscillator, two wideband limiting intermediate frequency amplifiers, a quadrature detector, a logarithmic Received Signal Strength Indicator (RSSI), fast RSSI op amps, a voltage regulator, a wideband data output, a post-detection filter amplifier, and a data switch. The SA639DH is packaged in a 24-lead TSSOP (Thin Shrink Small Outline Package).
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| VCC Supply Voltage | 2.7 | 3.0 | 5.5 | V |
| ICC Supply Current | - | 8.6 | 10 | mA |
| RF Frequency Range | - | - | 1 GHz | - |
| IF Amplifier Bandwidth | - | - | 40 MHz | - |
| Limiter Bandwidth | - | - | 28 MHz | - |
| IF Amplifier Gain | - | - | 44 dB | - |
| Limiter Gain | - | - | 58 dB | - |
| Package Type | - | - | 24-lead TSSOP | - |
| Power-down Mode | - | - | CMOS and TTL compatible | - |
Key Features
- High-speed RSSI (Received Signal Strength Indicator) with logarithmic output.
- Includes a mixer/oscillator, two wideband limiting intermediate frequency amplifiers, and a quadrature detector.
- Fast RSSI op amps and a voltage regulator for stable operation.
- Wideband data output and post-detection filter amplifier.
- Programmable data switch for routing data signals to external circuits.
- Power-down mode with CMOS and TTL compatible logic levels.
- ESD hardened for improved reliability.
Applications
- Digital European Cordless Telephone (DECT) systems.
- FSK (Frequency Shift Keying) and ASK (Amplitude Shift Keying) data receivers.
- High-bandwidth portable communication applications.
- Battery-operated devices requiring high performance and low power consumption.
Q & A
- What is the minimum operating voltage of the SA639DH?
The SA639DH operates down to 2.7 V.
- What is the package type of the SA639DH?
The SA639DH is packaged in a 24-lead TSSOP (Thin Shrink Small Outline Package).
- What are the key components integrated into the SA639DH?
The SA639DH includes a mixer/oscillator, two wideband limiting intermediate frequency amplifiers, a quadrature detector, a logarithmic RSSI, fast RSSI op amps, a voltage regulator, a wideband data output, a post-detection filter amplifier, and a data switch.
- What is the bandwidth of the IF amplifier in the SA639DH?
The bandwidth of the IF amplifier is about 40 MHz.
- Does the SA639DH have a power-down mode?
Yes, the SA639DH has a power-down mode that is CMOS and TTL compatible).
- What are some typical applications of the SA639DH?
The SA639DH is typically used in DECT systems, FSK and ASK data receivers, and high-bandwidth portable communication applications).
- Is the SA639DH ESD hardened?
Yes, the SA639DH is ESD hardened for improved reliability).
- What is the gain of the IF amplifier in the SA639DH?
The gain of the IF amplifier is about 44 dB from a 50 Ω source).
- How does the data switch function in the SA639DH?
The data switch routes a portion of the data signal to an external integration circuit that generates a data comparator reference voltage).
- What is the sensitivity of the SA639DH?
The SA639DH has an excellent sensitivity of 2.24 μV into a 50 Ω matching network for a 10 dB S/N ratio at RF 110 MHz and IF 9.8 MHz).
