ADS-916 14-Bit, 500kHz, Low-Power Sampling A/D Converters PRODUCT OVERVIEW The ADS-916 is a high-performance, 14-bit, correction circuitry. Digital input and output levels 500kHz sampling A/D converter. This device are TTL. samples input signals up to Nyquist frequencies Requiring ±15V (or ±12V) and +5V supplies, with no missing codes. The ADS-916 features the ADS-916 dissipates 1.8W (1.6W for ±12V) outstanding dynamic performance including a THD maximum. The unit is offered with a unipolar of –90dB. input (0 to +10V). Models are available for use in Housed in a small 24-pin DDIP or SMT (gull- either commercial (0 to +70°C), industrial (–40 wing) package, the functionally complete ADS-916 to +100°C), or HI-REL (–55 to +125°C) operating contains a fast-settling sample-hold amplifi er, a temperature ranges. Applications include radar, subranging (two-pass) A/D converter, a precise sonar, spectrum analysis, and graphic/medical voltage reference, timing/control logic, and error- imaging. INPUT/OUTPUT CONNECTIONS FEATURES PIN FUNCTION PIN FUNCTION „ 14-bit resolution 1 BIT 14 (LSB) 24 –12V/–15V SUPPLY „ 2 BIT 13 23 ANALOG GROUND 500kHz sampling rate 3 BIT 12 22 +12V/+15V SUPPLY „ Functionally complete; No missing codes 4 BIT 11 21 +10V REFERENCE OUT „ Edge-triggered; No pipeline delays 5 BIT 10 20 ANALOG INPUT „ 6 BIT 9 19 ANALOG GROUND Small 24-pin DDIP or SMT package 7 BIT 8 18 BIT 1 (MSB) „ Low power, 1.8 Watts maximum 8 BIT 7 17 BIT 2 „ Operates from ±15V or ±12V supplies & 9 BIT 6 16 START CONVERT +5V supply 10 BIT 5 15 EOC „ 11 BIT 4 14 DIGITAL GROUND Unipolar 0 to +10V input range (for bipolar ±5V 12 BIT 3 13 +5V SUPPLY see ADS-926) BLOCK DIAGRAM DAC 18 BIT 1 (MSB) 17 BIT 2 +10V REF. OUT 21 REF 12 BIT 3 11 BIT 4 2 S 10 BIT 5 FLASH 9 BIT 6 ADC 8 BIT 7 S/H S1 BUFFER 7 BIT 8 6 BIT 9 ANALOG INPUT 20 – 5 BIT 10 + 4 BIT 11 3 BIT 12 2 BIT 13 1 BIT 14 (LSB) START CONVERT 16 TIMING AND CONTROL LOGIC EOC 15 13 14 22 19, 23 24 +5V SUPPLY DIGITAL GROUND +12V/+15V SUPPLY ANALOG GROUND –12V/–15V SUPPLY Figure 1. ADS-916 Functional Block Diagram DATEL, Inc. 11 Cabot Boulevard, MansŢ eld, MA 02048-1151 USA • Tel: (508) 339-3000 • www.datel.com • e-mail: help@datel.com 24 Jul 2015 MDA_ADS-916.C02 Page 1 of 9 REGISTER REGISTER DIGITAL CORRECTION LOGIC ADS-916 14-Bit, 500kHz, Low-Power Sampling A/D Converters ABSOLUTE MAXIMUM RATINGS PHYSICAL/ENVIRONMENTAL PARAMETERS LIMITS UNITS PARAMETERS MIN. TYP. MAX. UNITS +12V/+15V Supply (Pin 22) 0 to +16 Volts Operating Temp. Range, Case –12V/–15V Supply (Pin 24) 0 to –16 Volts ADS-916MC, GC, MC-C, GC-C 0 — +70 °C +5V Supply (Pin 13) 0 to +6 Volts ADS-916ME, GE, ME-C, GE-C –40 — +100 °C Digital Input (Pin 16) –0.3 to +VDD +0.3 Volts ADS-916MM, GM, MM-C, GM-C –55 — +125 °C Analog Input (Pin 20) –4 to +17 Volts ADS-916MM-QL, 883, MM-QL-C, 883-C –55 — +125 °C Thermal Impedance Lead Temperature (10 seconds) +300 °C θjc — 6 — °C/Watt θca — 24 — °C/Watt Storage Temperature Range –65 — +150 °C Package Type 24-pin, metal-sealed, ceramic DDIP or SMT Weight 0.42 ounces (12 grams) FUNCTIONAL SPECIFICATIONS (TA = +25°C, ±VCC = ±15V (or ±12V), +VDD = +5V, 500kHz sampling rate, and a minimum 1 minute warmup ➀ unless otherwise specifi ed.) +25°C 0 TO +70°C –55 TO +125°C ANALOG INPUT MIN. TYP. MAX. MIN. TYP. MAX. MIN. TYP. MAX. UNITS Input Voltage Range ➁ — 0 to +10 — — 0 to +10 — — 0 to +10 — Volts Input Resistance — 1 — — 1 — — 1 — kΩ Input Capacitance — 7 15 — 7 15 — 7 15 pF DIGITAL INPUT Logic Levels Logic "1" +2.0 — — +2.0 — — +2.0 — — Volts Logic "0" — — +0.8 — — +0.8 — — +0.8 Volts Logic Loading "1" — — +20 — — +20 — — +20 μA Logic Loading "0" — — –20 — — –20 — — –20 μA Start Convert Positive Pulse Width ➂ 50 200 — 50 200 — 50 200 — ns STATIC PERFORMANCE Resolution — 14 — — 14 — — 14 — Bits Integral Nonlinearity (fin = 10kHz) — ±0.5 — — ±0.75 — — ±1.5 — LSB Differential Nonlinearity (fin = 10kHz) –0.95 ±0.5 +0.95 –0.95 ±0.5 +0.95 –0.95 ±0.75 +1.25 LSB Full Scale Absolute Accuracy — ±0.05 ±0.1 — ±0.1 ±0.2 — ±0.15 ±0.4 %FSR Unipolar Offset Error (Tech Note 2) — ±0.1 ±0.2 — ±0.1 ±0.2 — ±0.15 ±0.4 %FSR Gain Error (Tech Note 2) — ±0.1 ±0.25 — ±0.1 ±.025 — ±0.25 ±0.4 % No Missing Codes (fin = 10kHz) 14 — — 14 — — 14 — — Bits DYNAMIC PERFORMANCE Peak Harmonics (–0.5dB) dc to 100kHz — –91 –86 — –91 –86 — –90 –82 dB 100kHz to 250kHz — –84 –79 — –84 –79 — –82 –76 dB Total Harmonic Distortion (–0.5dB) dc to 100kHz — –90 –85 — –90 –85 — –87 –81 dB 100kHz to 250kHz — –82 –77 — –82 –77 — –80 –74 dB Signal-to-Noise Ratio (w/o distortion, –0.5dB) dc to 100kHz 77 81 — 77 81 — 76 80 — dB 100kHz to 250kHz 75 80 — 75 80 — 74 78 — dB Signal-to-Noise Ratio ➃ (& distortion, –0.5dB) dc to 100kHz 77 80 — 77 80 — 75 78 — dB 100kHz to 250kHz 72 78 — 72 78 — 70 76 — dB Two-tone Intermodulation Distortion (fin = 100kHz, 240kHz, fs = 500kHz –0.5dB) — –86 — — –86 — — –86 — dB Noise —310——310——360—μVrms Input Bandwidth (–3dB) Small Signal (–20dB input) — 7 — — 7 — — 7 — MHz Large Signal (–0.5dB input) — 3 — — 3 — — 3 — MHz Feedthrough Rejection (fin = 250 kHz) — 84 — — 84 — — 84 — dB Slew Rate — ±40 — — ±40 — — ±40 — V/μs Aperture Delay Time — ±20 — — ±20 — — ±20 — ns Aperture Uncertainty — 5 — — 5 — — 5 — ps rms S/H Acquisition Time (to ±0.003%FSR, 10V step) 1530 1570 1610 1530 1570 1610 1530 1570 1610 ns Overvoltage Recovery Time ➄ —14002000—14002000—14002000ns A/D Conversion Rate 500 — — 500 — — 500 — — kHz DATEL, Inc. 11 Cabot Boulevard, MansŢ eld, MA 02048-1151 USA • Tel: (508) 339-3000 • www.datel.com • e-mail: help@datel.com 24 Jul 2015 MDA_ADS-916.C02 Page 2 of 9 ADS-916 14-Bit, 500kHz, Low-Power Sampling A/D Converters +25°C 0 TO +70°C –55 TO +125°C ANALOG OUTPUT MIN. TYP. MAX. MIN. TYP. MAX. MIN. TYP. MAX. UNITS Internal Reference Voltage +9.95 +10.0 +10.05 +9.95 +10.0 +10.05 +9.95 +10.0 +10.05 Volts Drift — ±5 — — ±5 — — ±5 — ppm/°C External Current — — 1.5 — — 1.5 — — 1.5 mA DIGITAL OUTPUTS Logic Levels Logic "1" +2.4 — — +2.4 — — +2.4 — — Volts Logic "0" — — +0.4 — — +0.4 — — +0.4 Volts Logic Loading "1" — — –4 — — –4 — — –4 mA Logic Loading "0" — — +4 — — +4 — — +4 mA Delay, Falling Edge of EOC to Output Data Valid — — 35 — — 35 — — 35 ns Output Coding Straight Binary POWER REQUIREMENTS , ±15V Power Supply Ranges +15V Supply +14.5 +15.0 +15.5 +14.5 +15.0 +15.5 +14.5 +15.0 +15.5 Volts –15V Supply –14.5 –15.0 –15.5 –14.5 –15.0 –15.5 –14.5 –15.0 –15.5 Volts +5V Supply +4.75 +5.0 +5.25 +4.75 +5.0 +5.25 +4.75 +5.0 +5.25 Volts Power Supply Currents +15V Supply — +50 +70 — +50 +70 — +50 +70 mA –15V Supply — –40 –50 — –40 –50 — –40 –50 mA +5V Supply — +70 +85 — +70 +85 — +70 +85 mA Power Dissipation — 1.6 1.8 — 1.6 1.8 — 1.6 1.8 Watts Power Supply Rejection — — ±0.01 — — ±0.01 — — ±0.01 %FSR/%V POWER REQUIREMENTS, ±12V Power Supply Ranges +12V Supply +11.5 +12.0 +12.5 +11.5 +12.0 +12.5 +11.5 +12.0 +12.5 Volts –12V Supply –11.5 –12.0 –12.5 –11.5 –12.0 –12.5 –11.5 –12.0 –12.5 Volts +5V Supply +4.75 +5.0 +5.25 +4.75 +5.0 +5.25 +4.75 +5.0 +5.25 Volts Power Supply Currents +12V Supply — +50 +70 — +50 +70 — +50 +70 mA –12V Supply — –40 –50 — –40 –50 — –40 –50 mA +5V Supply — +70 +80 — +70 +80 — +70 +80 mA Power Dissipation ±12V — 1.4 1.6 — 1.4 1.6 — 1.4 1.6 Watts Power Dissipation ±15V — 1.6 1.9 — 1.6 1.9 — 1.6 1.9 Watts Power Supply Rejection — — ±0.01 — — ±0.01 — — ±0.01 %FSR/%V Footnotes: ➃ Effective bits is equal to: ➀ All power supplies must be on before applying a start convert pulse. All supplies and Full Scale Amplitude (SNR + Distortion) – 1.76 + 20 log the clock (START CONVERT) must be present during warmup periods. The device Actual Input Amplitude must be continuously converting during this time. There is a slight degradation in 6.02 performance when using ±12V supplies. ➁ See Ordering Information for availability of ±5V input range. Contact DATEL for ➄ This is the time required before the A/D output data is valid once the analog input is availability of other input voltage ranges. back within the speciŢ ed range. ➂ A 500 kHz clock with a 200ns wide start convert pulse is used for all production testing. Only the rising edge of the start convert pulse is required for the device to operate (edge-triggered). See Timing Diagram for more details. TECHNICAL NOTES 1. Obtaining fully specifi ed performance from the ADS-916 requires care- can be reduced to zero using the input circuit of Figure 2. When using this ful attention to pc-card layout and power supply decoupling. The device's circuit, or any similar offset and gain-calibration hardware, make adjust- analog and digital ground systems are connected to each other internally. ments following warmup. To avoid interaction, always adjust offset before For optimal performance, tie all ground pins (14, 19 and 23) directly to a gain. large analog ground plane beneath the package. 3. When operating the ADS-916 from ±12V supplies, do not drive external Bypass all power supplies and the REFERENCE OUTPUT (pin 21) to ground circuitry with the REFERENCE OUTPUT. The reference's accuracy and drift with 4.7μF tantalum capacitors in parallel with 0.1μF ceramic capacitors. specifi cations may not be met, and loading the circuit may cause accuracy Locate the bypass capacitors as close to the unit as possible. If the user- errors within the converter. installed offset and gain adjusting circuit shown in Figure 2 is used, also 4. Applying a start convert pulse while a conversion is in progress (EOC = locate it as close to the ADS-916 as possible. logic "1") initiates a new and inaccurate conversion cycle. Data for the 2. The ADS-916 achieves its specifi ed accuracies without the need for exter- interrupted and subsequent conversions will be invalid. nal calibration. If required, the device's small initial offset and gain errors DATEL, Inc. 11 Cabot Boulevard, MansŢ eld, MA 02048-1151 USA • Tel: (508) 339-3000 • www.datel.com • e-mail: help@datel.com 24 Jul 2015 MDA_ADS-916.C02 Page 3 of 9 ADS-916 14-Bit, 500kHz, Low-Power Sampling A/D Converters CALIBRATION PROCEDURE (Refer to Figures 2 and 3) Any offset and/or gain calibration procedures should not be implemented Gain adjusting is accomplished when all bits are 1's and the LSB just until devices are fully warmed up. To avoid interaction, offset must be changes from a 1 to a 0. This transition ideally occurs when the analog adjusted before gain. The ranges of adjustment for the circuit of Figure 2 input is at +full scale minus 1½ LSB's (+9.999085V). are guaranteed to compensate for the ADS-916's initial accuracy errors Zero/Offset Adjust Procedure and may not be able to compensate for additional system errors. 1. Apply a train of pulses to the START CONVERT input (pin 16) so the con- All fi xed resistors in Figure 2 should be metal-fi lm types, and multiturn verter is continuously converting. If using LED's on the outputs, a 200kHz potentiometers should have TCR’s of 100ppm/°C or less to minimize drift conversion rate will reduce fl icker. with temperature. 2. Apply +305μV to the ANALOG INPUT (pin 20). A/D converters are calibrated by positioning their digital outputs exactly on the transition point between two adjacent digital output codes. This can 3. Adjust the offset potentiometer until the output bits are all 0's and the LSB be accomplished by connecting LED's to the digital outputs and adjusting fl ickers between 0 and 1. until certain LED's "fl icker" equally between on and off. Other approaches Gain Adjust Procedure employ digital comparators or microcontrollers to detect when the outputs change from one code to the next. 1. Apply +9.999085V to the ANALOG INPUT (pin 20). For the ADS-916, offset adjusting is normally accomplished at the point 2. Adjust the gain potentiometer until the output bits are all 1's and the LSB where the output bits are 0's and the LSB just changes from a 0 to a 1. fl ickers between 1 and 0. This digital output transition ideally occurs when the applied analog input Table 1. Zero and Gain Adjust is +½LSB (+305μV). INPUT VOLT- ZERO ADJUST GAIN ADJUST +15V AGE RANGE +½ LSB +FS –1½ LSB 20k7 200k7 2k7 ZERO/ 0 to +10V +305μV +9.999085V OFFSET ADJUST GAIN Table 2. Output Coding ADJUST –15V +15V DIGITAL OUTPUT 1.98k7 SIGNAL INPUT VOLTAGE INPUT To Pin 20 UNIPOLAR SCALE 50 7 OFFSET BINARY of ADS-916 (0 TO +10V) MSB LSB +9.999390 +FS –1LSB 11 1111 1111 1111 –15V +7.500000 +3/4 FS 11 0000 0000 0000 Figure 2. ADS-916 Calibration Circuit +5.000000 +1/2 FS 10 0000 0000 0000 +2.500000 +1/4 FS 01 0000 0000 0000 +0.000610 +1LSB 00 0000 0000 0001 0.000000 0 00 0000 0000 0000 Coding is straight binary; 1LSB = 610μV. 18 BIT 1 (MSB) +5V 13 17 BIT 2 + 12 BIT 3 4.7μF 0.1μF DIGITAL 11 BIT 4 14 GROUND 10 BIT 5 9 BIT 6 ADS-916 8 BIT 7 –12V/–15V 24 7 BIT 8 4.7μF 0.1μF + 6 BIT 9 ANALOG 19, 23 GROUND 5 BIT 10 4.7μF 0.1μF 4 BIT 11 + +12V/+15V 22 3 BIT 12 2 BIT 13 ANALOG 0 to +10V 20 INPUT 1 BIT 14 (LSB) 15 EOC 21 +10V REF. OUT + START 0.1μF 4.7μF 16 CONVERT Figure 3. Typical ADS-916 Connection Diagram DATEL, Inc. 11 Cabot Boulevard, MansŢ eld, MA 02048-1151 USA • Tel: (508) 339-3000 • www.datel.com • e-mail: help@datel.com 24 Jul 2015 MDA_ADS-916.C02 Page 4 of 9 ADS-916 14-Bit, 500kHz, Low-Power Sampling A/D Converters overheat. The ground and power planes beneath the package, as well as all THERMAL REQUIREMENTS pcb signal runs to and from the device, should be as heavy as possible to help All DATEL sampling A/D converters are fully characterized and specifi ed over conduct heat away from the package. operating temperature (case) ranges of 0 to +70°C and –55 to +125°C. All Electrically-insulating, thermally-conductive "pads" may be installed under- room-temperature (TA = +25°C) production testing is performed without the neath the package. Devices should be soldered to boards rather than "sock- use of heat sinks or forced-air cooling. Thermal impedance fi gures for each eted," and of course, minimal air fl ow over the surface can greatly help reduce device are listed in their respective specifi cation tables. the package temperature. These devices do not normally require heat sinks, however, standard precau- tionary design and layout procedures should be used to ensure devices do not N N + 1 START CONVERT 200ns typ. 10ns typ. Acquisition Time Hold 430ns typ. INTERNAL S/H 1570ns ±40ns 70ns ±10ns 90ns typ. EOC Conversion Time 420ns ±20ns 35ns max. 74ns max. OUTPUT Data (N – 1) Valid Data N Valid (1926ns min.) DATA Invalid Data Notes: 1. fs = 500kHz. 2. The ADS-916 is an edge-triggered device. All internal operations are triggered by the rising edge of the start convert pulse, which may be as narrow as 50nsec. All production testing is performed at a 500kHz sampling rate with 200nsec wide start pulses. For lower sampling rates, wider start pulses may be used, however, a minimum pulse width low of 50nsec must be maintained. Figure 4. ADS-916 Timing Diagram DATEL, Inc. 11 Cabot Boulevard, MansŢ eld, MA 02048-1151 USA • Tel: (508) 339-3000 • www.datel.com • e-mail: help@datel.com 24 Jul 2015 MDA_ADS-916.C02 Page 5 of 9 ADS-916 14-Bit, 500kHz, Low-Power Sampling A/D Converters DATEL, Inc. 11 Cabot Boulevard, MansŢ eld, MA 02048-1151 USA • Tel: (508) 339-3000 • www.datel.com • e-mail: help@datel.com 24 Jul 2015 MDA_ADS-916.C02 Page 6 of 9 Figure 5. ADS-916 Evaluation Board Schematic ADS-916 14-Bit, 500kHz, Low-Power Sampling A/D Converters 0 –10 –20 –30 –40 –50 –60 –70 –80 –90 –100 –110 –120 –130 –140 –150 –160 –170 0 25 50 75 100 125 150 175 200 225 250 Frequency (kHz) (fs = 500kHz, fin = 240kHz, Vin = –0.5dB, 16,384-point FFT) Figure 6. ADS-916 FFT Analysis +0.34 DNL (LSB's) 0 –0.33 0 16,384 Digital Output Code 0 16,384 Digital Output Code Figure 7. ADS-916 Histogram and Differential Nonlinearity DATEL, Inc. 11 Cabot Boulevard, MansŢ eld, MA 02048-1151 USA • Tel: (508) 339-3000 • www.datel.com • e-mail: help@datel.com 24 Jul 2015 MDA_ADS-916.C02 Page 7 of 9 Amplitude Relative to Full Scale (dB) Number of Occurrences ADS-916 14-Bit, 500kHz, Low-Power Sampling A/D Converters MECHANICAL DIMENSIONS INCHES (mm) 1.31 MAX. (33.27) 24-Pin DDIP Dimension Tolerances (unless otherwise indicated): Versions 2 place decimal (.XX) ±0.010 (±0.254) 3 place decimal (.XXX) ±0.005 (±0.127) ADS-916MC 24 13 Lead Material: Kovar alloy ADS-916ME 0.80 MAX. Lead Finish: 50 microinches (minimum) gold plating (20.32) ADS-916MM over 100 microinches (nominal) nickel plating 112 ADS-916MM-QL ADS-916/883 ADS-916MC-C 0.100 TYP. (2.540) ADS-916ME-C 1.100 ADS-916MM-C (27.940) 0.235 MAX. ADS-916-C/883 (5.969) PIN 1 INDEX 0.200 MAX. (5.080) +0.002 0.010 –0.001 (0.254) 0.190 MAX. 0.100 0.100 (4.826) (2.540) (2.540) SEATING 0.600 ±0.010 PLANE (15.240) 0.040 0.018 ±0.002 0.025 (1.016) (0.457) (0.635) 1.31 MAX. (33.02) 24-Pin Surface Mount Dimension Tolerances (unless otherwise indicated): Versions 24 13 2 place decimal (.XX) ±0.010 (±0.254) ADS-916GC 3 place decimal (.XXX) ±0.005 (±0.127) Lead Material: Kovar alloy ADS-916GE 0.80 MAX. (20.32) Lead Finish: 50 microinches (minimum) gold plating ADS-916GM over 100 microinches (nominal) nickel plating ADS-916G/883 1 12 ADS-916GC-C ADS-916GE-C ADS-916GM-C ADS-916G-C/883 0.020 TYP. 0.060 TYP. 0.015 (0.508) (1.524) 0.190 MAX. (0.381) (4.826) MAX. radius 0.130 TYP. PIN 1 for any pin (3.302) INDEX 0.100 (2.540) 0.020 0.010 TYP. (0.508) (0.254) 0.100 TYP. 0.040 (2.540) (1.016) DATEL, Inc. 11 Cabot Boulevard, MansŢ eld, MA 02048-1151 USA • Tel: (508) 339-3000 • www.datel.com • e-mail: help@datel.com 24 Jul 2015 MDA_ADS-916.C02 Page 8 of 9 ADS-916 14-Bit, 500kHz, Low-Power Sampling A/D Converters ORDERING GUIDE OPERATING MODEL NUMBER PACKAGE ROHS TEMPERATURE RANGE ADS-916MC 0 to +70°C DDIP No ADS-916MC-C 0 to +70°C DDIP Yes ADS-916ME –40 to +100°C DDIP No ADS-916ME-C –40 to +100°C DDIP Yes ADS-916MM –55 to +125°C DDIP No ADS-916MM-C –55 to +125°C DDIP Yes ADS-916MM-QL –55 to +125°C DDIP No ADS-916MM-QL-C –55 to +125°C DDIP Yes ADS-916/883 –55 to +125°C DDIP No ADS-916-C/883 –55 to +125°C DDIP Yes ADS-916GC 0 to +70°C SMT No ADS-916GC-C 0 to +70°C SMT Yes ADS-916GE –40 to +100°C SMT No ADS-916GE-C –40 to +100°C SMT Yes ADS-916GM –55 to +125°C SMT No ADS-916GM-C –55 to +125°C SMT Yes ADS-916G/883 –55 to +125°C SMT No ADS-916G-C/883 –55 to +125°C SMT Yes For bipolar analog input ±5V see ADS-926 data sheet. DATEL is a registered trademark of DATEL, Inc. DATEL, Inc. makes no representation that the use of its products in the circuits described herein, or the use of other technical information contained herein, will not infringe upon existing or future patent rights. The descriptions contained herein do not imply the granting of 11 Cabot Boulevard, MansŢ eld, MA 02048-1151 USA licenses to make, use, or sell equipment constructed in accordance therewith. Specifi cations are subject to change without notice. ITAR and ISO 9001/14001 REGISTERED © 2015 DATEL, Inc. www.datel.com • e-mail: help@datel.com 24 Jul 2015 MDA_ADS-916.C02 Page 9 of 9