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ADS-950MC Datasheet(PDF) 1 Page - List of Unclassifed Manufacturers |
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1 / 6 page FEATURES · 18-bit resolution · 500kHz minimum sampling rate · No missing codes over full military temperature range · Very low power, 1.45 Watts · Small, 32-pin, side-brazed, ceramic TDIP · Edge-triggered · Excellent performance · Ideal for both time and frequency-domain applications · Low cost operating temperature ranges. A proprietary, auto-calibrating, error-correcting circuit enables the device to achieve specified performance over the full military temperature range. PRELIMINARY PRODUCT DATA ADS-950 18-Bit, 500kHz, Low-Power Sampling A/D Converters GENERAL DESCRIPTION The low-cost ADS-950 is an 18-bit, 500kHz sampling A/D converter. This device accurately samples full-scale input signals up to Nyquist frequencies with no missing codes. This feature, combined with excellent signal-to-noise ratio (SNR) and total harmonic distortion (THD), makes the ADS-950 the ideal choice for both time-domain (medical imaging, scanners, process control) and frequency-domain (radar, telecommunica- tions, spectrum analysis) applications. Packaged in a 32-pin, side-brazed, metal-sealed, ceramic TDIP, the functionally complete ADS-950 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, and the ADS-950 only requires the rising edge of the start convert pulse to operate. Requiring ±15V and ±5V supplies, the ADS-950 typically dissipates 1.45 Watts. The device is offered with a bipolar (±5V) analog input range. Models are available for use in either commercial (0 to +70°C) or military (–55 to +125°C) INPUT/OUTPUT CONNECTIONS Figure 1. ADS-950 Functional Block Diagram 1 BIT 2 32 BIT 3 2 BIT 1 (MSB) 31 BIT 4 3 ANALOG GROUND 30 BIT 5 4 ANALOG INPUT 29 BIT 6 5 +5V REFERENCE OUT 28 BIT 7 6 GAIN ADJUST 27 BIT 8 7 COMPENSATION 26 BIT 9 8 –15V SUPPLY 25 BIT 10 9 +15V SUPPLY 24 BIT 11 10 +5V ANALOG SUPPLY 23 BIT 12 11 –5V ANALOG SUPPLY 22 BIT 13 12 ANALOG GROUND 21 BIT 14 13 DIGITAL GROUND 20 BIT 15 14 +5V DIGITAL SUPPLY 19 BIT 16 15 EOC 18 BIT 17 16 START CONVERT 17 BIT 18 (LSB) PIN FUNCTION PIN FUNCTION DATEL, Inc., Mansfield, MA 02048 (USA) · Tel: (508) 339-3000, (800) 233-2765 Fax: (508) 339-6356 · Email: sales@datel.com · Internet: www.datel.com ®® REF DAC 2 BIT 1 (MSB) 1 BIT 2 32 BIT 3 31 BIT 4 30 BIT 5 29 BIT 6 28 BIT 7 27 BIT 8 26 BIT 9 25 BIT 10 24 BIT 11 23 BIT 12 22 BIT 13 21 BIT 14 20 BIT 15 19 BIT 16 18 BIT 17 17 BIT 18 (LSB) TIMING AND CONTROL LOGIC ANALOG INPUT 4 START CONVERT 16 EOC 15 – + S/H BUFFER FLASH ADC 1 FLASH ADC 2 5 AMP GAIN CIRCUIT COMPENSATION 7 +5V REFERENCE OUT 5 10 +5V ANALOG SUPPLY 11 –5V ANALOG SUPPLY 3, 12 ANALOG GROUND 14 +5V DIGITAL SUPPLY 9 +15V SUPPLY 8 –15V SUPPLY 13 DIGITAL GROUND GAIN ADJUST 6 |
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