The AD8348 is a broadband quadrature demodulator with an integrated intermediate frequency (IF), variable gain amplifier (VGA), and integrated baseband amplifiers. It is suitable for use in communications receivers, performing quadrature demodulation from IF directly to baseband frequencies. The baseband amplifiers are designed to interface directly with dual-channel ADCs, such as the AD9201, AD9283, and AD9218, for digitizing and post-processing.
The IF input signal is fed into two Gilbert cell mixers through an X-AMP® VGA. The IF VGA provides 44 dB of gain control. A precision gain control circuit sets a linear-in-decibel gain characteristic for the VGA and provides temperature compensation. The LO quadrature phase splitter employs a divide-by-2 frequency divider to achieve high quadrature accuracy and amplitude balance over the entire operating frequency range.
The AD8348 is fabricated on an advanced bipolar process, operating on a single 3 or 5 volt supply, packaged in space saving 28 lead thin shrunk small outline (TSSOP) package and fully specified over the –40 to +85 C temperature range
Samples AD8348ARU and evaluation boards AD8348-EVAL are available
Other Modulator/Demodulator products
Features and Benefits
| RF & Microwave |
| Document | note |
| AD8348: 50-1000 MHz Quadrature Demodulator Data Sheet (Rev. A) | PDF 922 kB |
| Document | note |
| AN-924: Digital Quadrature Modulator Gain (Rev. A) | PDF 105 kB |
| Part Number | Package | Packing Qty | Temp Range | Price 100-499 | Price 1000+ | RoHS |
|---|---|---|---|---|---|---|
| AD8348ARU Production | 28 ld TSSOP (4.4mm) | OTH 50 | -40 to 85C | 6.42 | 5.8 | N |
| AD8348ARU-REEL7 Production | 28 ld TSSOP (4.4mm) | REEL 1000 | -40 to 85C | 0 | 5.8 | N |
| AD8348ARUZ Production | 28 ld TSSOP (4.4mm) | OTH 50 | -40 to 85C | 5.56 | 5.01 | Y |
| AD8348ARUZ-REEL7 Production | 28 ld TSSOP (4.4mm) | REEL 1000 | -40 to 85C | 0 | 5.01 | Y |
| Part Number | Description | Price | RoHS |
|---|---|---|---|
| AD8348-EVALZ | Evaluation Board | 200 | Y |
