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LTM9004 - 14-Bit Direct Conversion Receiver Subsystem

The LTM®9004 is a 14-bit direct conversion receiver subsystem. Utilizing an integrated system in a package (SiP) technology, the LTM9004 is a μModule® receiver that includes a dual high speed 14-bit A/D converter, lowpass filter, differential gain stages and a quadrature demodulator. Contact Linear Technology regarding customization.

The LTM9004 is perfect for zero-IF communications applications, with AC performance that includes 76dB SNR and 63.5dB spurious free dynamic range (SFDR). The entire chain is DC-coupled and provides access for DC offset adjustment. The integrated on-chip broadband transformers provide 50Ω single-ended interfaces at the RF and LO inputs.

A 5V supply powers the mixer and first amplifier for minimal distortion while a 3V supply allows low power ADC operation. A separate supply allows the outputs to drive 0.5V to 3.3V logic. An optional multiplexer allows both channels to share a digital output bus. An optional clock duty cycle stabilizer allows high performance at full speed for a wide range of clock duty cycles.

Features Integrated Dual 14-Bit, High-Speed ADC, Lowpass Filter, Differential Gain Stages and I/Q Demodulator Lowpass Filter for Each ADC Channel 1.92MHz (LTM9004-AA) 4.42MHz (LTM9004-AB) 9.42MHz (LTM9004-AC) 20MHz (LTM9004-AD) RF Input Frequency Range: 0.7GHz to 2.7GHz 50Ω Single-Ended RF and LO Ports I/Q Gain Mismatch: 0.2dB Typical I/Q Phase Mismatch: 1.5 Deg Typical Voltage-Adjustable Demodulator DC Offsets 76dB/1.92MHz SNR (LTM9004-AA) 63.5dB SFDR (LTM9004-AA) Clock Duty Cycle Stabilizer Low Power: 1.83W Shutdown and Nap Modes 15mm × 22mm LGA Package Typical Application

Applications Telecommunications Direct Conversion Receivers Cellular Basestations Packaging

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