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AD9224ARS Datasheet(PDF) 11 Page - Analog Devices |
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AD9224ARS Datasheet(HTML) 11 Page - Analog Devices |
11 / 24 page AD9224 –11– REV. A Table I. Analog Input Configuration Summary Input Input Input Range (V) Figure Connection Coupling Span (V) VINA 1 VINB 1 # Comments Single-Ended DC 2 0 to 2 1 19, 20 Best for stepped input response applications, requires ±5 V op amp. 2 × VREF 0 to VREF 19, 20 Same as above but with improved noise performance due to 2 × VREF increase in dynamic range. Headroom/settling time require- ments of ±5 op amp should be evaluated. 4 0 to 4 2.0 19, 20 Optimum noise performance, excellent SNR performance, often requires low distortion op amp with VCC > +5 V due to its head- room issues. 2 × VREF 2.0 – VREF 2.0 30 Optimum THD performance with VREF = 1. Single supply to operation (i.e., +5 V) for many op amps. 2.0 + VREF Single-Ended AC 2 or 0 to 1 or 1 or VREF 21, 22 2 × VREF 0 to 2 × VREF 4 0.5 to 4.5 2.5 22 Optimum noise performance, excellent THD performance, ability to use ±5 V op amp. 2 × VREF 2.0 – VREF 2.0 21 Flexible input range, Optimum THD performance with to VREF = 1. Ability to use either +5 V or ±5 V op amp. 2.0 + VREF Differential AC/DC 2 2 to 3 3 to 2 23, 24 Optimum full-scale THD and SFDR performance well beyond (via Transformer) the A/Ds Nyquist frequency. Preferred mode for undersampling or Amplifier applications. 2 × VREF 2.0 – VREF/2 2.0 + VREF/2 23, 24 Same as above with the exception that full-scale THD and SFDR to to performance can be traded off for better noise performance. 2.0 + VREF/2 2.0 – VREF/2 4.0 1.5 to 3.5 3.5 to 1.5 23, 24 Optimum noise performance. NOTE 1VINA 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 EXT. REF. EXTERNAL 2 ≤ SPAN ≤ 4 CAPT and CAPB SENSE AVDD (DYNAMIC) Externally Driven VREF AVSS EXT. REF. CAPT EXT. REF. CAPB |
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