® ® ADS-119 12-Bit, 10MHz, Low-Power Sampling A/D Converters FEATURES • • • • • • • • • • 12-bit resolution 10MHz minimum sampling rate Functionally complete Small 24-pin DDIP or SMT package Requires only ±5V supplies Low-power, 1.8 Watts Outstanding dynamic performance Edge-triggered No missing codes over temperature Ideal for both time and frequency-domain applications GENERAL DESCRIPTION The ADS-119 is a high-performance, 12-bit, 10MHz sampling A/D converter. The device samples input signals up to Nyquist frequencies with no missing codes. The ADS-119 features excellent dynamic performance including a typical SNR of 69dB. Packaged in a metal-sealed, ceramic, 24-pin DDIP, the functionally complete ADS-119 contains a fast-settling sample/ hold amplifier, a subranging (two-pass) A/D converter, a precise voltage reference, timing/control logic, and errorcorrection circuitry. All timing and control logic operates from the rising edge of a single start convert pulse. Digital input and output levels are TTL. Requiring only ±5V supplies, the ADS-119 typically dissipates 1.8 Watts. The unit offers a bipolar input range of ±1.5V. Models are available for use in either commercial (0 to +70°C) or military (–55 to +125°C) operating temperature ranges. INPUT/OUTPUT CONNECTIONS PIN FUNCTION PIN 1 2 3 4 5 6 7 8 9 10 11 12 BIT 12 (LSB) BIT 11 BIT 10 BIT 9 BIT 8 BIT 7 BIT 6 BIT 5 BIT 4 BIT 3 BIT 2 BIT 1 24 23 22 21 20 19 18 17 16 15 14 13 FUNCTION NO CONNECT ANALOG GROUND NO CONNECT +5V ANALOG SUPPLY –5V SUPPLY ANALOG INPUT ANALOG GROUND OFFSET ADJUST START CONVERT DATA VALID DIGITAL GROUND +5V DIGITAL SUPPLY Typical applications include signal analysis, medical/graphic imaging, process control, ATE, radar, and sonar. OFFSET ADJUST 17 BUFFER FLASH ADC 1 + 12 BIT 1 (MSB) 11 BIT 2 REF Σ AMP START CONVERT 16 REGISTER DAC FLASH ADC 2 10 BIT 3 OUTPUT REGISTER S/H REGISTER – DIGITAL CORRECTION LOGIC ANALOG INPUT 19 9 BIT 4 8 BIT 5 7 BIT 6 6 BIT 7 5 BIT 9 4 BIT 9 3 BIT 10 2 BIT 11 1 BIT 12 (LSB) TIMING AND CONTROL LOGIC DATA VALID 15 21 13 14 20 18, 23 22, 24 +5V ANALOG SUPPLY +5V DIGITAL SUPPLY DIGITAL GROUND –5V SUPPLY ANALOG GROUND NO CONNECT Figure 1. ADS-119 Functional Block Diagram 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 ® ® ADS-119 ABSOLUTE MAXIMUM RATINGS PARAMETERS +5V Supply (Pin 13, 21) –5V Supply (Pin 20) Digital Input (Pin 16) Analog Input (Pin 19) Lead Temp (10 seconds) PHYSICAL/ENVIRONMENTAL LIMITS UNITS 0 to +6 0 to –6 –0.3 to +VDD +0.3 ±5 +300 Volts Volts Volts Volts °C PARAMETERS Operating Temp. Range, Case ADS-119MC/GC ADS-119MM/GM/883 Thermal Impedance θjc θca Storage Temperature Package Type Weight FUNCTIONAL SPECIFICATIONS (TA = +25°C, ±VDD = ±5V, 10mHz sampling rate, and a minimum 3 minute warmup ➀ unless otherwise specified.) +25°C ANALOG INPUT Input Voltage Range ➁ Input Resistance Input Capacitance MIN. TYP. MAX. UNITS 0 –55 — — +70 +125 °C °C 6 °C/Watt 24 °C/Watt –65 — +150 °C 24-pin, metal-sealed, ceramic DDIP or SMIT 0.42 ounces (12 grams) 0 to +70°C MIN. TYP. MAX. — 300 — ±1.5 350 6 +2.0 — — — — –55 to +125°C MIN. TYP. MAX. MIN. TYP. MAX. UNITS — — 15 — 300 — ±1.5 350 6 — — 15 — 300 — ±1.5 350 6 — — 15 Volts Ω pF — — — — 50 — +0.8 +20 –20 — +2.0 — — — — — — — — 50 — +0.8 +20 –20 — +2.0 — — — — — — — — 50 — +0.8 +20 –20 — Volts Volts µA µA ns — — — — — — — 12 12 ±0.75 ±0.5 ±0.2 ±0.2 ±0.1 ±0.1 — — — ±0.95 ±0.5 ±0.6 ±0.6 ±0.5 — — — 0.95 — — — — 12 12 ±1.0 ±0.5 ±0.5 ±0.3 ±0.3 ±0.5 — — — +1 ±0.75 ±0.7 ±0.7 ±1.0 — — — –0.95 — — — — 12 12 ±1.5 ±0.75 ±0.75 ±0.6 ±0.7 ±1.0 — — — +1.25 ±1.5 ±1.0 ±1.5 ±2.5 — Bits LSB LSB %FSR — — — –70 –70 –70 –63 –63 –63 — — — –70 –70 –70 –63 –63 –63 — — — –69 –69 –67 –61 –60 –60 dB dB dB — — — –69 –68 –68 –63 –63 –63 — — — –69 –68 –67 –63 –63 –63 — — — –68 –67 –66 –60 –60 –60 dB dB 66 66 66 69 69 69 — — — 66 66 66 69 69 69 — — — 63 63 63 67 66 66 — — — dB dB dB 62 62 62 66 66 66 — — — 62 62 62 66 66 66 — — — 60 60 60 65 65 64 — — — dB dB dB — — –72 250 — — — — –72 300 — — — — –72 400 — — dB µVrms — — — — — — 60 10 76 ±400 5 3 — — — — — — — — — — — — 60 10 76 ±400 5 3 — — — — — — — — — — — — 60 10 76 ±400 5 3 — — — — — — MHz MHz dB V/µs ns ps rms 30 — 10 35 100 — 37 — — 30 — 500 35 100 — 37 — — 30 — 500 35 100 — 37 — — ns ns MHz DIGITAL INPUT Logic Levels Logic "1" Logic "0" Logic Loading "1" Logic Loading "0" Start Convert Positive Pulse Width ➂ STATIC PERFORMANCE Resolution Integral Nonlinearity (fin = 10kHz) Differential Nonlinearity (fin = 10kHz) Full Scale Absolute Accuracy Bipolar Zero Error (Tech Note 2) Unipolar Offset Error (Tech Note 2) Gain Error (Tech Note 2) No Missing Codes (fin = 10kHz) %FSR % Bits DYNAMIC PERFORMANCE Peak Harmonics (–0.5dB) dc to 1MHz 1MHz to 2.5MHz 2.5MHz to 5MHz Total Harmonic Distortion (–0.5dB) dc to 1MHz 1MHz to 2.5MHz 2.5MHz to 5MHz Signal-to-Noise Ratio (w/o distortion, –0.5dB) dc to 1MHz 1MHz to 2.5MHz 2.5MHz to 5MHz Signal-to-Noise Ratio ➃ (& distortion, –0.5dB) dc to 1MHz 1MHz to 2.5MHz 2.5MHz to 5MHz Two-tone Intermodulation Distortion (fin = 100kHz, 240kHz, fs = 1MHz, –0.5dB) Noise Input Bandwidth (–3dB) Small Signal (–20dB input) Large Signal (–0dB input) Feedthrough Rejection (fin = 5MHz) Slew Rate Aperture Delay Time Aperture Uncertainty S/H Aquisition Time (to ±0.01%FSR, 3V step) Overvoltage Recovery Time ➄ A/D Conversion Rate 2 ® ® ADS-119 +25°C 0 to +70°C DIGITAL OUTPUTS MIN. TYP. MAX. MIN. Logic Levels Logic "1" Logic "0" Logic Loading "1" Logic Loading "0" Output Coding +2.4 — — — — — — — — +0.4 –4 +4 +4.75 –4.75 +5.0 –5.0 — — — — +200 –180 1.8 — –55 to +125°C TYP. MAX. MIN. +2.4 — — — — — — — — +0.4 –4 +4 Offset Binary +2.4 — — — +5.25 –5.25 +4.75 –4.75 +5.0 –5.0 +5.25 –5.25 +215 –205 2.1 ±0.01 — — — — +200 –180 1.8 — +215 –205 2.1 ±0.01 TYP. MAX. UNITS — — — — — +0.4 –4 +4 Volts Volts mA mA +4.9 –4.9 +5.0 –5.0 +5.25 –5.25 Volts Volts — — — — +200 –180 1.8 — +215 –205 2.1 ±0.01 mA mA Watts %FSR/%V POWER REQUIREMENTS Power Supply Ranges ➅ +5V Supply –5V Supply Power Supply Current +5V Supply –5V Supply Power Dissipation Power Supply Rejection Footnotes: ➀ All power supplies must be on before applying a start convert pulse. All supplies and the clock (START CONVERT) must be present during warmup periods. The device must be continuously converting during this time. There is slight degradation in performance when using ±12V supplies. ➃ Effective bits is equal to: (SNR + Distortion) – 1.76 + 20 log Full Scale Amplitude Actual Input Amplitude 6.02 ➁ See ordering information for availability of ±5V input range. Contact DATEL for availability of other input voltage ranges. ➄ This is the time required before the A/D output data is valid after the analog input is back within the specified range. ➂ 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). TECHNICAL NOTES 1. Obtaining fully specified performance from the ADS-119 requires careful attention to pc-card layout and power supply decoupling. The device's analog and digital ground systems are connected to each other internally. For optimal performance, tie all ground pins (14, 18, and 23) directly to a large analog ground plane beneath the package. initial offset and gain errors can be reduced to zero using the adjustment circuitry shown in Figures 3 and 4. For operation without adjustment, tie pin 17 to analog ground. When using this circuitry, or any similar offset and gaincalibration hardware, make adjustments following warmup. To avoid interaction, always adjust offset before gain. Bypass all power supplies to ground with 4.7µF tantalum capacitors in parallel with 0.1µF ceramic capacitors. Locate the bypass capacitors as close to the unit as possible. 3. Applying a start convert pulse while a conversion is in progress (EOC = logic "1") will initiate a new and inaccurate conversion cycle. 2. The ADS-119 achieves its specified accuracies without the need for external calibration. If required, the device's small 4. Data is valid only for the time period (55ns, typical) shown in Figure 2 even if the device is sampling at less than 10MHz. N START CONVERT N+1 50ns typ. 10ns typ. INTERNAL S/H Acquisition Time Hold 65ns typ. Hold 30ns min. 35ns typ. 37ns max. 15ns typ. 20ns typ. Conversion Time INTERNAL EOC 72ns min. 80ns typ. 83ns max. 35ns typ. DATA VALID 40ns typ. ±5ns 10ns typ. DATA 60ns typ. 45ns typ. DATA N-1 VALID INVALID DATA 55ns typ. 40ns typ. ±5ns DATA N VALID INVALID DATA Scale is approximately 5ns per division. Figure 2. ADS-119 Timing Diagram 3 INVALID DATA ® ® ADS-119 CALIBRATION PROCEDURE (Refer to Figures 3 and 4, Table 1) Gain Adjust Procedure 1. Apply +1.4989V to the ANALOG INPUT (pin 19). Any offset and/or gain calibration procedures should not be implemented until devices are fully warmed up. To avoid interaction, offset must be adjusted before gain. The ranges of adjustment for the circuits in Figure 3 and 4 are guaranteed to compensate for the ADS-119's initial accuracy errors and may not be able to compensate for additional system errors. 2. Adjust the gain potentiometer until all output bits are 1's and the LSB flickers between 1 and 0. 3. To confirm proper operation of the device, vary the input signal to obtain the output coding listed in Table 1. A/D converters are calibrated by positioning their digital outputs exactly on the transition point between two adjacent digital output codes. This can be accomplished by connecting LED's to the digital outputs and adjusting until certain LED's "flicker" equally between on and off. Other approaches employ digital comparators or microcontrollers to detect when the outputs change from one code to the next. Table 1. Output Coding for Bipolar Operation Offset adjusting for the ADS-119 is normally accomplished at the point where the MSB is a 1 and all other output bits are 0's and the LSB just changes from a 0 to a 1. This digital output transition ideally occurs when the applied analog input is +½ LSB (+366µV). BIPOLAR SCALE ADS-119 INPUT VOLTAGE (±1.5V RANGE) +FS–1 LSB +3/4 FS +1/2 FS 0 –1/2 FS –3/4 FS –FS +1 LSB –FS +1.49927V +1.12500V +0.75000V 0.00000V –0.75000V –1.12500V –1.49927V –1.50000V Gain adjusting is accomplished when all bits are 1's and the LSB just changes from a 1 to a 0. This transition ideally occurs when the analog input is at +full scale minus 1 ½ LSB's (+1.4989V). OUTPUT CODING OFFSET BINARY MSB LSB 1111 1111 1110 0000 1100 0000 1000 0000 0100 0000 0010 0000 0000 0000 0000 0000 1111 0000 0000 0000 0000 0000 0001 0000 2kΩ GAIN ADJUST +15V Zero/Offset Adjust Procedure 1.98kΩ SIGNAL INPUT 1. Apply a train of pulses to the START CONVERT input (pin 16) so the converter is continuously converting. To Pin 19 of ADS-119 50Ω 2. Apply +366µV to the ANALOG INPUT (pin 19). 3. Adjust the offset potentiometer until the output bits are 1000 0000 0000 and the LSB flickers between 0 and 1. –15V Figure 3. Optional Calibration Circuit, ADS-119 +5V ➀ 12 BIT 1 (MSB) 11 BIT 2 13, 20 4.7µF 10 BIT 3 0.1µF 9 BIT 4 14 8 BIT 5 7 BIT 6 6 BIT 7 20 –5V 5 BIT 8 + 4.7µF ADS-119 0.1µF 18, 20 4 BIT 9 3 BIT 10 2 BIT 11 +5V 1 BIT 12 (LSB) 15 DATA VALID OFFSET ADJUST 17 19 ANALOG INPUT 20kΩ 16 START CONVERT –5V ➀ A single +5V supply should be used for both the +5V analog and +5V digital. If separate supplies are used, the difference between the two cannot exceed 100mV. Figure 4. Typical Connection Diagram 4 5 P4 3 1 2 2 ANALOG INPUT R1 500 3 -15V R2 20K 1 +15V 5 4 1 3 5 7 9 11 13 15 17 19 21 23 25 4 6 8 10 12 14 16 18 20 22 24 26 P2 6 SG6 C7 2.2MF C4 2.2MF 20MHY L4 20MHY C5 2.2MF 20MHY C6 L5 2.2MF L6 C11 0.01MF -5VA C12 0.01MF -15V +15V C13 0.01MF SG3 SG2 SG1 3 20MHY C2 2.2MF 4 3 C9 0.01MF -5V C8 0.01MF +5VF C10 0.01MF 15 18 2 +5V -5V 20 17 21 22 24 19 16 14 13 7 14 8 23 118 119 +5V +5V 2 C21 0.1MF + X1 U5 74HCT86 U5 U5 74HCT86 7 U5 14 3 B12 B11 B10 B9 B8 B7 B6 B5 B4 B3 B2 B1 11 6 8 74HCT86 C15 0.1MF +5VF SPARE GATES 13 12 5 4 10 9 2 1 EOC AGND AGND -5V U1 ADS-118/119 ENABLE +5VA NOTES: 1. UNLESS OTHERWISE SPECIFIED ALL CAPACITORS ARE 50V C1-C6 ARE 20V ALL RESISTORS ARE IN OHMS 2. AS AN OPTION, COXIAL CABLE BETWEEN THESE TWO POINTS. 1 2 3 4 5 6 7 8 9 10 11 12 FOR ADS-118/118A 5MHZ FOR ADS-119 10MHZ ANAIN TRIG DGND +5VD +5VF START CONVERT C22 4.7MF +5V 3 1 1 P3 JPR2 1 2 118A JPR1 119A 118A 119A JPR6 50 118 119 20MHY C1 2.2MF L2 JPR3 2 R7 20MHY C3 2.2MF L1 L3 -5VA 3 1 +5VA 2 R3 20K 1 JPR5 +5VA C14 .01MF 0.1MF OPTION 118A 119 OFFSET C19 SEE NOTE 2 L7, 20MHY -5VA 10 C18 .1MF OPTION +5VA R4 2K SG8 11 -15V SG7 U4 C20 SG4 OPTIONAL +15V SG5 SEE NOTE 2 2 GAIN SG9 R5 1.98K R6 1.2M +5VF LE 11 9 LE 8D 10 OE 8Q OE 8Q 7Q 6Q 5Q 4Q 3Q 2Q 1Q + 1 1 12 13 14 15 16 17 18 19 C16 2.2MF 10 74HCT573 20 2 1D 3 2D 4 3D 5 4D 6 5D U2 7 6D 8 7D 11 12 13 2 1 3 JPR4 B12 B11 B10 B9 B8 B7 B6 B5 B4 B3 B2 15 14 B1 16 17 18 19 P1 2 4 6 (LSB) 8 10 12 14 16 18 20 22 24 26 28 (MSB) 30 32 34 Figure 5. ADS-119 Evaluation Board Schematic +5VF +5VF 7Q 6Q 5Q 4Q 3Q 2Q 1Q + C17 2.2MF 74HCT573 20 2 1D 3 2D 4 3D 5 4D 6 5D U3 7 6D 8 7D 9 8D +5VF 1 3 5 7 9 11 13 15 17 19 21 23 25 27 29 31 33 ® ® ADS-119 ® ADS-119 THERMAL REQUIREMENTS 3000 All DATEL sampling A/D converters are fully characterized and specified over operating temperature (case) ranges of 0 to +70°C and –55 to +125°C. All room-temperature (TA = +25°C) production testing is performed without the use of heat sinks or forced-air cooling. Thermal impedance figures for each device are listed in their respective specification tables. 2500 2000 Occurrences These devices do not normally require heat sinks, however, standard precautionary design and layout procedures should be used to ensure devices do not overheat. The ground and power planes beneath the package, as well as all pcb signal runs to and from the device, should be as heavy as possible to help conduct heat away from the package. Electricallyinsulating, thermally-conductive "pads" may be installed underneath the package. Devices should be soldered to boards rather than "socketed", and of course, minimal air flow over the surface can greatly help reduce the package temperature. 1500 1000 500 In more severe ambient conditions, the package/junction temperature of a given device can be reduced dramatically (typically 35%) by using one of DATEL's HS Series heat sinks. See Ordering Information for the assigned part number. See page 1-183 of the DATEL Data Acquisition Components Catalog for more information on the HS Series. Request DATEL Application Note AN-8, "Heat Sinks for DIP Data Converters", or contact DATEL directly, for additional information. 0 Digital Output Code Figure 6. ADS-119 Grounded Input Histogram This histogram represents the typical peak-to-peak noise (including quantization noise) associated with the ADS-119. 4,096 conversions were processed with the input to the ADS-119 tied to analog ground. 0 Amplitude Relative to Full Scale (dB) –10 –20 –30 –40 –50 –60 –70 –80 –90 –100 –110 –120 –130 0 0.5 1 1.5 2 2.5 3 3.5 4 Frequency (MHz) (fs = 10MHz, fin = 4.9MHz, Vin = –0.5dB, 4,096-point FFT) Figure 7. ADS-119 FFT Analysis 6 4.5 5 ® ® ® ADS-119 Number of Occurences DNL (LSB's) +0.73 0 –0.47 0 Digital Output Code 0 4096 4096 Digital Output Code Figure 8. ADS-119 Histogram and Differential Nonlinearity THD vs. Input Frequency 80 70 70 60 60 50 50 THD (–dB) Peak Harmonic (–dB) PH vs. Input Frequency 80 40 30 40 30 20 20 10 10 0 0 1 10 100 1000 10000 1 10 Frequency (kHz) SNR vs. Input Frequency 1000 10000 1000 10000 SNR+D vs. Input Frequency 80 80 70 70 60 60 50 50 SNR+D (dB) SNR (dB) 100 Frequency (kHz) 40 30 40 30 20 20 10 10 0 0 1 10 100 1000 10000 1 Frequency (kHz) 10 100 Frequency (kHz) Figure 9. ADS-119 Performance Curves 7 ® ® ADS-119 MECHANICAL DIMENSIONS INCHES (mm) 1.31 MAX. (33.27) 24-Pin DDIP Version 24 Dimension Tolerances (unless otherwise indicated): 2 place decimal (.XX) ±0.010 (±0.254) 3 place decimal (.XXX) ±0.005 (±0.127) 13 0.80 MAX. (20.32) ADS-119MC ADS-119MM ADS-926MC ADS-119/883 1 Lead Material: Kovar alloy Lead Finish: 50 microinches (minimum) gold plating over 100 microinches (nominal) nickel plating 12 0.100 TYP. (2.540) 1.100 (27.940) 0.235 MAX. (5.969) PIN 1 INDEX 0.200 MAX. (5.080) 0.010 (0.254) 0.190 MAX. (4.826) 0.100 (2.540) 0.600 ±0.010 (15.240) SEATING PLANE 0.025 (0.635) 0.040 (1.016) 0.018 ±0.002 (0.457) +0.002 –0.001 0.100 (2.540) 1.31 MAX. (33.02) 24-Pin Surface Mount Versions Dimension Tolerances (unless otherwise indicated): 2 place decimal (.XX) ±0.010 (±0.254) 3 place decimal (.XXX) ±0.005 (±0.127) 13 24 ADS-119GC ADS-119GM Lead Material: Kovar alloy 0.80 MAX. (20.32) 1 0.210 MAX. (5.334) Lead Finish: 50 microinches (minimum) gold plating over 100 microinches (nominal) nickel plating 12 0.020 TYP. (0.508) 0.060 TYP. (1.524) 0.130 TYP. (3.302) PIN 1 INDEX 0.100 (2.540) 0.100 TYP. (2.540) 0.020 (0.508) 0.015 (0.381) MAX. radius for any pin 0.010 TYP. (0.254) 0.040 (1.016) ORDERING INFORMATION MODEL NUMBER ACCESSORIES ADS-B119 HS-24 OPERATING TEMP. RANGE ADS-119MC 0 to +70°C ADS-119MM ADS-119/883 ADS-119GC ADS-119GM –55 to +125°C –55 to +125°C 0 to +70°C –55 to +125°C Evaluation Board (without ADS-119) Heat Sinks for all ADS-119 DDIP models Receptacles for PC board mounting can be ordered through AMP Inc. Part # 3-331272-8 (Components Lead Socket), 24 required. For MIL-STD-883 product specification or availability of surface mounts package, contact DATEL. ® ® ISO 9001 R E DATEL, Inc. 11 Cabot Boulevard, Mansfield, MA 02048-1151 Tel: (508) 339-3000 (800) 233-2765 Fax: (508) 339-6356 Internet: www.datel.com E-mail:[email protected] Data Sheet Fax Back: (508) 261-2857 G I S T E R E D DS-0289B 3/97 DATEL (UK) LTD. Tadley, England Tel: (01256)-880444 DATEL S.A.R.L. Montigny Le Bretonneux, France Tel: 1-34-60-01-01 DATEL GmbH München, Germany Tel: 89-544334-0 DATEL KK Tokyo, Japan Tel: 3-3779-1031, Osaka Tel: 6-354-2025 DATEL 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 licenses to make, use, or sell equipment constructed in accordance therewith. Specifications are subject to change without notice. The DATEL logo is a registered DATEL, Inc. trademark.