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AD9225ARZ Arkusz danych(PDF) 11 Page - Analog Devices |
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AD9225ARZ Arkusz danych(HTML) 11 Page - Analog Devices |
11 / 25 page AD9225 –11– Table I. Analog Input Configuration Summary Input Input Input Range (V) Figure Connection Coupling Span (V) VINA * VINB * No. Comments Single-Ended DC 2 0 to 2 1 8, 9 Best for stepped input response applications; requires ±5 V op amp. 2 ¥ VREF 0 to VREF 8, 9 Same as above but with improved noise 2 ¥ VREF performance due to increase in dynamic range. Headroom/settling time requirements of ±5 V op amp should be evaluated. 40 to 4 2.0 8, 9 Optimum noise performance, excellent THD performance, often requires low distortion op amp with VCC > +5 V due to its headroom issues. 2 ¥ VREF 2.0 – VREF 2.0 21 Optimum THD performance with VREF = 1. to Single-supply operation (i.e., +5 V) for many 2.0 + VREF op amps. Single-Ended AC 2 or 0 to 1 or 1 or VREF 10, 11 2 ¥ VREF 0 to 2 ¥ VREF 4 0.5 to 4.5 2.0 11 Optimum noise performance, excellent THD performance; ability to use ±5 V op amp. 2 ¥ VREF 2.0 – VREF 2.0 10 Flexible input range, optimum THD perfor- to mance with VREF = 1. Ability to use either 2.0 + VREF +5 V or ±5 V op amp. Differential AC/DC 2 2 to 3 3 to 2 12, 13 Optimum full-scale THD and SFDR perfor- (via Transformer) mance well beyond the ADC’s Nyquist or Amplifier frequency. Preferred mode for under- sampling applications. 2 ¥ VREF 2.0 – VREF/2 2.0 + VREF/2 12, 13 Same as above with the exception that full- to to scale THD and SFDR performance can be 2.0 + VREF/2 2.0 – VREF/2 traded off for better noise performance. 4.0 1.5 to 3.5 3.5 to 1.5 12, 13 Optimum noise performance. *VINA and VINB can be interchanged if signal inversion is required. Table II. Reference Configuration Summary Reference Input Span (VINA–VINB) Operating Mode (V p-p) Required VREF (V) Connect To Internal 2 1 SENSE VREF Internal 4 2 SENSE REFCOM Internal 2 £ SPAN £ 4 and 1 £ VREF £ 2.0 and R1 VREF and SENSE SPAN = 2 VREF VREF = (1 + R1/R2) R2 SENSE and REFCOM External 2 £ SPAN £ 41 £ VREF £ 2.0 SENSE AVDD (Nondynamic) VREF External Reference External 2 £ SPAN £ 4 CAPT and CAPB SENSE AVDD (Dynamic) Externally Driven VREF AVSS External Reference CAPT External Reference CAPB Rev. C |
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