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AD9066JR Scheda tecnica(PDF) 6 Page - Analog Devices |
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AD9066JR Scheda tecnica(HTML) 6 Page - Analog Devices |
6 / 7 page –6– + + AD9066 CLKIN OPTIONAL BPF OR LPF PLL VINA VINB CLOCK 1 6 11 28 27 26 25 24 23 20 19 18 17 16 15 A OUTPUTS (INPHASE) B OUTPUTS (QUADRATURE) 0 90 RECEIVED SIGNAL STRENGTH INDICATOR AGC DETECTOR PTAT VOLTAGE 10 VMID 10 100nF 330 100nF 4.7 F 330 BANDPASS FILTER AGC VOLTAGE MIDPOINT BIAS GENERATOR BIAS CIRCUIT –16dBM LOCAL OSCILLATOR RF INPUT (ANTENNA) AD607 Figure 8. Digitizer with AD607 Receiver Circuit Theory of Operation The AD9066 dual ADC employs a patented interpolated flash architecture. This architecture enables 64 possible quantization levels with only 32 comparator preamplifiers. This keeps input capacitance to a minimum. The midpoint of the reference lad- der is fed back to the analog input, allowing easy biasing of the ADC to midscale for ac coupled applications. As shown in Figure 4d, a simple resistor is used to provide the reference ladder midpoint to the analog input. The high imped- ance MOS inputs of the comparators insure no static voltage drop across the resistor. This eliminates the need for an active buffer (and its inherent offsets) to set the reference midpoint at the analog input. The outputs of the comparators are converted to a 6-bit word and converted to CMOS levels. The digital signals are latched at six stages (two pipeline delays) in the signal path. The digital outputs are CMOS with approximately equal rise and fall times. The encode clock utilizes a CMOS input stage with TTL- compatible (1.4 V) thresholds. Internal clock buffers minimize external clock drive requirements. REV. A AD9066 |
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