DC1642A-AB

DEMO MANUAL DC1642A LTM9003 12-Bit Digital Predistortion Receiver Subsystem Description Demonstration circuit DC1642A is an evaluation board fea- sition demo board using an FT149 adapter card and the turing Linear Technology Corporations LTM 9003 12-Bit output can be easily analyzed with Linear Technologys predistortion receiver subsystem. DC1642A demonstrates PScope data processing software, which is available good circuit layout techniques and recommended external for no charge on our website at DEMO MANUAL DC1642A quick start proce D Signal Power Supply +5V at 200mA Generator * BPF HP 8644B or Equivalent Power Supply +3.3V at 1A Signal Generator BPF HP 8644B or Equivalent To FT149+ DC890B * Note: Even a high-quality signal synthesizer will still have noise and harmonics that should RF Signal Generator be attenuated with a low-pass or band-pass (HP 8644B) or Other lter. For good-quality high order lters, see Low Phase Noise BPF TTE, Lark Engineering, or equivalent. Clock Source (e.g. DC1216) Figure 1. Proper Measurement Equipment Setup Table 2. DC1642A Connectors and Jumpers REFERENCE FUNCTION J2 (Mode) Output Format and Clock Duty Stabilizer Pin. Default is V . DD J3 (SHDN/OE) Enables/Disables the ADC. Default is ON. J4 (Sense) Reference Input to Adjust the Full-Scale Range of the DC1642A. Default is V . DD J5 (RF) Board RF Signal Input. Impedance-matched to 50 for use with lab signal generators. J6 (Mixer/Amplifier Enable) Enables/Disables the RF Mixer and Amplifier. Default is ON. J7 (CLK) Board Clock Input. Impedance-matched to 50. Drive with a low-phase-noise clock oscil-lator or filtered sine wave signal source. J9 (LO) Board LO Signal Input. Impedance-matched to 50 for use with lab signal generators. TP1 (External Reference) Reference Input to Adjust the Full-Scale Range of the LTM9003. Connects to the SENSE pin by default, tied to V for DD internal reference. TP2 (GND) DC Ground. TP3 (3.3V) DC Supply Input (3.3VDC). TP4 (GND) DC Ground. TP5 (5V) DC Supply Input (5VDC). dc1642af 2 ure