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ADS-943MC Arkusz danych(PDF) 1 Page - Murata Power Solutions Inc. |
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ADS-943MC Arkusz danych(HTML) 1 Page - Murata Power Solutions Inc. |
1 / 8 page ® ® ADS-943 14-Bit, 3MHz, Low-Distortion Sampling A/D Converters edge-triggered, requiring only the rising edge of a start convert pulse to initiate a conversion. The device is offered with a bipolar input range of ±2V. Models are available for use in either commercial (0 to +70°C) or military (–55 to +125°C) operating temperature ranges. A proprietary, auto-calibrating, error-correcting circuit allows the device to achieve specified performance over the full military temperature range. Figure 1. ADS-943 Functional Block Diagram INPUT/OUTPUT CONNECTIONS PIN FUNCTION PIN FUNCTION 1 BIT1 (MSB) 24 ANALOG GROUND 2 BIT 2 23 OFFSET ADJUST 3 BIT 3 22 +5V ANALOG SUPPLY 4 BIT 4 21 ANALOG INPUT 5 BIT 5 20 –5V SUPPLY 6 BIT 6 19 ANALOG GROUND 7 BIT 7 18 START CONVERT 8 BIT 8 17 EOC 9 BIT 9 16 BIT 14 (LSB) 10 BIT 10 15 BIT 13 11 BIT 11 14 DIGITAL GROUND 12 BIT 12 13 +5V DIGITAL SUPPLY DATEL, Inc., 11 Cabot Boulevard, Mansfield, MA 02048-1151 (U.S.A.) • Tel: (508) 339-3000 Fax: (508) 339-6356 • For immediate assistance: (800) 233-2765 FEATURES • 14-bit resolution • 3MHz minimum sampling rate • Ideal for both frequency and time-domain applications • Excellent peak harmonics, –83dB • Excellent signal-to-noise ratio, 79dB • No missing codes over full military temperature range • ±5V supplies, 1.7 Watts • Small, 24-pin ceramic DDIP or SMT • Low cost GENERAL DESCRIPTION The low-cost ADS-943 is a 14-bit, 3MHz sampling A/D converter optimized to meet the demanding dynamic-range and sampling-rate requirements of contemporary digital telecommunications applications. The ADS-943's outstanding dynamic performance is evidenced by a peak harmonic specification of –83dB and a signal-to-noise ratio (SNR) of 79dB. Additionally, the ADS-943 easily achieves the 2.2MHz minimum sampling rate required by digital receivers in certain ADSL, HDSL and ATM applications. The ADS-943 also addresses size and power constraints normally associated with these types of applications. This device requires just ±5V supplies, dissipates 1.7 Watts, and is packaged in a very small 24-pin DDIP. Although optimized for frequency-domain applications, the ADS-943's DNL and noise specifications are also outstanding, thereby making it an equally impressive device for time-domain applications (graphic and medical imaging, process control, etc.). In fact, the ADS-943 guarantees no missing codes to the 14-bit level over the full military operating temperature range. The functionally complete ADS-943 contains a fast-settling sample-hold amplifier, a subranging (two-pass) A/D converter, an internal reference, timing/control logic, and error-correction circuitry. Digital input and output levels are TTL. The unit is REF DAC 16 BIT 14 (LSB) 15 BIT 13 12 BIT 12 11 BIT 11 10 BIT 10 9 BIT 9 8 BIT 8 7 BIT 7 6 BIT 6 5 BIT 5 4 BIT 4 3 BIT 3 2 BIT 2 1 BIT 1 (MSB) TIMING AND CONTROL LOGIC OFFSET ADJUST 23 ANALOG INPUT 21 START CONVERT 18 EOC 17 +5V ANALOG SUPPLY 22 +5V DIGITAL SUPPLY 13 DIGITAL GROUND 14 –5V SUPPLY 20 ANALOG GROUND 19, 24 – + S/H BUFFER FLASH ADC 1 FLASH ADC 2 POWER AND GROUNDING Σ AMP |
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