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ADS-937 Dataheets PDF



Part Number ADS-937
Manufacturers Datel
Logo Datel
Description 16-Bit / 1MHz Low-Power Sampling A/D Converters
Datasheet ADS-937 DatasheetADS-937 Datasheet (PDF)

® ® ADS-937 16-Bit, 1MHz, Low-Power Sampling A/D Converters FEATURES • • • • • • • • • 16-bit resolution 1MHz minimum sampling rate No missing codes over full military temperature range Very low power, 1.25 Watts Small, 32-pin, side-brazed, ceramic TDIP Edge-triggered Excellent performance Ideal for both time and frequency-domain applications Low cost INPUT/OUTPUT CONNECTIONS PIN 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 FUNCTION ANALOG INPUT ANALOG GROUND UNIPOLAR OFFSET ADJUST +5V REFERENCE O.

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® ® ADS-937 16-Bit, 1MHz, Low-Power Sampling A/D Converters FEATURES • • • • • • • • • 16-bit resolution 1MHz minimum sampling rate No missing codes over full military temperature range Very low power, 1.25 Watts Small, 32-pin, side-brazed, ceramic TDIP Edge-triggered Excellent performance Ideal for both time and frequency-domain applications Low cost INPUT/OUTPUT CONNECTIONS PIN 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 FUNCTION ANALOG INPUT ANALOG GROUND UNIPOLAR OFFSET ADJUST +5V REFERENCE OUT GAIN ADJUST COMPENSATION –15V SUPPLY +15V SUPPLY +5V ANALOG SUPPLY –5V ANALOG SUPPLY ANALOG GROUND DIGITAL GROUND +5V DIGITAL SUPPLY EOC START CONVERT PIN 32 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 FUNCTION BIT 1 (MSB) BIT 2 BIT 3 BIT 4 BIT 5 BIT 6 BIT 7 BIT 8 BIT 9 BIT 10 BIT 11 BIT 12 BIT 13 BIT 14 BIT 15 BIT 16 (LSB) GENERAL DESCRIPTION The low-cost ADS-937 is a 16-bit, 1MHz 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-937 the ideal choice for both time-domain (CCD/medical imaging, scanners, process control) and frequency-domain (radar, telecommunications, spectrum analysis) applications. Packaged in a 32-pin, side-brazed, metal-sealed, ceramic TDIP, the functionally complete ADS-937 contains a fastsettling sample-hold amplifier, a subranging (two-pass) A/D converter, an internal reference, timing/control logic, and errorcorrection circuitry. Digital input and output levels are TTL. ADS-937 only requires the rising edge of the start convert pulse to operate. Requiring ±15V and ±5V supplies, the ADS-937 typically dissipates 1.25 Watts. The device is offered with both bipolar (±5V) and unipolar (0 to –10V) analog input ranges. 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 enables the device to achieve specified performance over the full military temperature range. UNIPOLAR 3 OFFSET ADJUST 4 32 BIT 1 (MSB) BUFFER ANALOG INPUT 1 31 BIT 2 – S/H + FLASH ADC 1 DIGITAL CORRECTION LOGIC 30 BIT 3 29 BIT 4 28 BIT 5 27 BIT 6 26 BIT 7 25 BIT 8 24 BIT 9 23 BIT 10 22 BIT 11 21 BIT 12 20 BIT 13 19 BIT 14 18 BIT 15 17 BIT 16 (LSB) GAIN ADJUST 6 GAIN CIRCUIT REF +5V REFERENCE OUT 5 COMPENSATION 7 Σ DAC AMP FLASH ADC 2 START CONVERT 16 EOC 15 TIMING AND CONTROL LOGIC 10 +5V ANALOG SUPPLY 11 –5V ANALOG SUPPLY 2, 12 ANALOG GROUND 14 +5V DIGITAL SUPPLY 9 +15V SUPPLY 8 –15V SUPPLY 13 DIGITAL GROUND Figure 1. ADS-937 Functional Block Diagram DATEL, Inc., Mansfield, MA 02048 (USA) • Tel: (508) 339-3000, (800) 233-2765 Fax: (508) 339-6356 • Email: [email protected] • Internet: www.datel.com ® ® ADS-937 ABSOLUTE MAXIMUM RATINGS PARAMETERS +15V Supply (Pin 9) –15V Supply (Pin 8) +5V Supply (Pins 10, 14) –5V Supply (Pin 11) Digital Input (Pin 16) Analog Input (Pin 1) Lead Temperature (10 seconds) LIMITS 0 to +16 0 to –16 0 to +6 0 to –6 –0.3 to +VDD +0.3 ±15 +300 UNITS Volts Volts Volts Volts Volts Volts °C PHYSICAL/ENVIRONMENTAL PARAMETERS Operating Temp. Range, Case ADS-937MC ADS-937MM/883 Thermal Impedance θjc θca Storage Temperature Range Package Type Weight MIN. 0 –55 — — –65 TYP. — — 5 22 — MAX. +70 +125 — — +150 UNITS °C °C °C/Watt °C/Watt °C 32-pin,side-brazed, metal-sealed, ceramic TDIP 0.56 ounces (16 grams) FUNCTIONAL SPECIFICATIONS (TA = +25°C, ±VCC = ±15V, ±VDD = ±5V, 1MHz sampling rate, and a minimum 1 minute warm-up Œ unless otherwise specified.) +25°C ANALOG INPUTS Input Voltage Ranges  Bipolar Unipolar Input Resistance Input Capacitance DIGITAL INPUTS Logic Levels Logic "1" Logic "0" Logic Loading "1" Logic Loading "0" Start Convert Positive Pulse Width Ž STATIC PERFORMANCE Resolution Integral Nonlinearity Differential Nonlinearity (fin = 10kHz) Full Scale Absolute Accuracy Bipolar Zero Error (Tech Note 2) Bipolar Offset Error (Tech Note 2) Gain Error (Tech Note 2) Unipolar Offset Error (Tech Note 2) No Missing Codes (fin = 10kHz) DYNAMIC PERFORMANCE Peak Harmonics (–0.5dB) dc to 100kHz 100kHz to 500kHz Total Harmonic Distortion (–0.5dB) dc to 100kHz 100kHz to 500kHz Signal-to-Noise Ratio (w/o distortion, –0.5dB) dc to 100kHz 100kHz to 500kHz Signal-to-Noise Ratio  (& distortion, –0.5dB) dc to 100kHz 100kHz to 500kHz Noise Two-Tone Intermodulation Distortion (fin = 100kHz, 240kHz, fs = 1MHz, –0.5dB) Input Bandwidth (–3dB) Small Signal (–20dB input) Large Signal (–0.5dB input) Feedthrough Rejection (fin = 500kHz) Slew Rate Aperture Delay Time Aperture Uncertainty S/H Acquisition Time ( to ±0.003%FSR, 10V step) Overvoltage Recovery Time  A/D Conversion Rate — — — — 85 84 81 80 — — — — — — — — — — 1 –90 –88 –87 –86 88 87 85 84 110 –85 4.5 4 84 ±33 +20 5 260 500 — –84 –81 –82 –81 — — — — — — — — — — — — 300 1000 — — — — — 85 84 81 80 — — — — — — — — — — 1 –90 –.


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