ADC-WB-BB/NOPB

ADC-WB-BB / ADC-LD-BB User’s Guide Thank you for your interest in TI’s ADC-WB-BB / ADC-LD-BB. “ADC-WB-BB” stands for ADC Wide-Band Balun Board and “ADC-LD-BB” stands for ADC Low-Distortion Balun Board. One each of these boards is included in the Hardware Kit with the GSPS ADC Reference Boards. Since the analog inputs to the ADC1xDxx00RB are differential and most signal sources are single-ended, these balun boards are generally used to achieve single-ended-to-differential conversion. In case both I- and Q-inputs are simultaneously driven with a similar signal, an additional balun board of the same type may be desired. The ADC-LD-BB uses the B0430J50100AHF from Anaren, which is designed for highperformance and low cost, see Figure 1. Since the input impedance of the GSPS ADCs are 100Ω and the impedance of most signal generators are 50Ω, the 1:2 impedance ratio is very convenient. The 10pF capacitor at the input is recommended by Anaren for best performance, see Figure 2. This balun is also a very good choice for driving the GSPS ADC sampling clock (CLK+/-). • • • • • • • Board: ADC-LD-BB Balun: B0430J50100AHF Balun Manufacturer: Anaren Frequency range: {400MHz, 3GHz} Impedance ratio: 1:2 Features: multi-layer construction, low insertion loss, low distortion Datasheet: http://www.anaren.com/sites/default/files/ B0430J50100AHF_DataSheet_RevA.pdf Figure 1. ADC-LD-BB Figure 2. ADC-LD-BB Schematic SNAU123 The ADC-WB-BB uses the TC1-1-13MA+ from Mini-Circuits, which is designed for wide-band functionality and low cost, see Figure 3. Since the input impedance of the GSPS ADCs are 100Ω, the impedance of most signal generators are 50Ω, and the impedance ratio of this balun is 1:1, the extra 100Ω across the output (R1 and R3) is present for impedance matching, see Figure 4. However, this does incur an additional 3dB insertion loss. • • • • • • • Board: ADC-WB-BB Balun: TC1-1-13MA+ Balun Manufacturer: Mini-Circuits Frequency range: {4.5MHz, 3GHz} Impedance ratio: 1:1 Features: wire-wound construction, wide-band functionality, good return loss Datasheet: http://www.minicircuits.com/pdfs/TC1-113MA+.pdf Figure 3. ADC-WB-BB Figure 4. ADC-WB-BB Schematic SNAU123 IMPORTANT NOTICE Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, modifications, enhancements, improvements, and other changes to its products and services at any time and to discontinue any product or service without notice. Customers should obtain the latest relevant information before placing orders and should verify that such information is current and complete. All products are sold subject to TI’s terms and conditions of sale supplied at the time of order acknowledgment. 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