ADS-117MM

® ® ADS-117 12-Bit, 2MHz, Low-Power Sampling A/D Converters FEATURES • • • • • • • • 12-bit resolution No missing codes 2MHz minimum throughput Functionally complete Small 24-pin DDIP Low-power, 1.6 Watts Three-state output buffers Samples to Nyquist frequencies GENERAL DESCRIPTION DATEL's ADS-117 is a functionally complete, 12-bit, 2MHz, sampling A/D converter. Its standard, 24-pin, double-width DIP contains a fast-settling sample-hold amplifier, a 12-bit subranging (two-step) A/D converter, a precision reference, three-state output register and all the timing and control logic necessary to operate from a single start convert pulse. Digital input and output levels are TTL. Total harmonic distortion (THD) and signal-to-noise ratio (including distortion) typically run –78dB and 70dB, respectively, with full scale inputs up to 100kHz. The ADS117 requires ±15V and +5V power supplies and typically consumes 1.6 Watts. Models are available for use in either commercial (0 to +70°C) or military (–55 to +125°C) operating temperature ranges. PIN 1 2 3 4 5 6 7 8 9 10 11 12 INPUT/OUTPUT CONNECTIONS FUNCTION 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 (MSB) PIN 24 23 22 21 20 19 18 17 16 15 14 13 FUNCTION –15V SUPPLY ANALOG GROUND +15V SUPPLY +10V REFERENCE BIPOLAR ANALOG INPUT COMP BIN ENABLE (1-12) START CONVERT EOC DIGITAL GROUND +5V SUPPLY 17 ENABLE (1-12) DAC 12 BIT 1 (MSB) +10V REF. 21 S2 S/H S1 BIPOLAR 20 BUFFER FLASH ADC REF 11 BIT 2 DIGITAL CORRECTION LOGIC 3-STATE OUTPUT REGISTER 10 BIT 3 9 8 7 6 5 4 3 2 1 BIT 4 BIT 5 BIT 6 BIT 7 BIT 8 BIT 9 BIT 10 BIT 11 BIT 12 (LSB) ANALOG INPUT 19 – + COMP BIN 18 START CONVERT 16 EOC 15 TIMING AND CONTROL LOGIC 13 +5V SUPPLY 14 DIGITAL GROUND 22 +15V SUPPLY REGISTER 23 ANALOG GROUND REGISTER 24 –15V SUPPLY Figure 1. ADS-117 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-117 ABSOLUTE MAXIMUM RATINGS PARAMETERS +15V Supply (Pin 22) –15V Supply (Pin 24) +5V Supply (Pin 13) Digital Inputs (Pin 16, 17, 18) Analog Input (Pin 19) Lead Temp. (10 seconds) LIMITS 0 to +16 0 to –16 0 to +6.0 –0.3 to +VDD +0.3 –9 to +15 +300 UNITS Volts Volts Volts Volts Volts °C DYNAMIC PERF. (cont) SNR (wo/distortion, –0.5dB) dc to 100kHz 0°C to +70°C –55°C to +125°C 100kHz to 500kHz 0°C to +70°C –55°C to +125°C 500kHz to 1MHz 0°C to +70°C –55°C to +125°C SNR (and distort., –0.5dB) ➂ dc to 100kHz 0°C to +70°C –55°C to +125°C 100kHz to 500kHz 0°C to +70°C –55°C to +125°C 500kHz to 1MHz 0°C to +70°C –55°C to +125°C Two-tone Intermodulation Distortion (fin = 970kHz, 990kHz, fs = 2Mhz, –0.5dB) Slew Rate Effect. Aperture Delay Time Overvoltage Recovery Time; 20% S/H Acq. Time, (to ±0.01%) 0 to +70°C –55°C to +125°C Conversion Rate OUTPUTS ±3 ±4 ±0.95 +1.5 ±0.44 ±0.73 ±0.38 ±0.73 ±0.38 ±0.73 ±0.38 ±0.73 +10.03 +10.05 1.5 LSB LSB LSB LSB %FSR %FSR %FSR %FSR %FSR %FSR % % Volts Volts mA Output Coding Pin 18 High Pin 18 Low Logic Level Logic "1" Logic "0" Logic Loading "1" Logic Loading "0" POWER REQUIREMENTS Power Supply Ranges ➃ +15V Supply –15V Supply +5V Supply Power Supply Current +15V Supply –15V Supply +5V Supply Power Dissipation Power Supply Rejection PHYSICAL/ENVIRONMENTAL Operating Temp. Range, Case ADS-117MC ADS-117MM, 883 Storage Temperature Range Thermal Impedance θjc θca Package Type Weight ➂ Effective bits is equal to: (SNR + Distortion) – 1.76 + 20 log 6.02 MIN. TYP. MAX. UNITS — — 65 65 — — — — 64 62 — — 72 72 70 70 70 70 70 69 70 69 69 69 — — — — — — — — — — — — dB dB dB dB dB dB dB dB dB dB dB dB FUNCTIONAL SPECIFICATIONS (TA = +25°C, ±VCC = +15V, +VDD =+5V, 2MHz sampling rate, and a minimum 3 minute warmup unless otherwise specified.) ANALOG INPUTS Input Voltage Range ➀ Bipolar Unipolar Input Impedence Input Capacitance DIGITAL INPUTS Logic Levels Logic "1" Logic "0" Logic Loading "1" Logic Loading "0" PERFORMANCE Resolution No Missing Codes (12 Bits; fin = 1MHz) Integral Non-Linearity 0°C to +70°C –55°C to +125°C Differential Non-Linearity 0°C to +70°C –55°C to +125°C Full Scale Absolute Accuracy (see Tech Note 1) 0°C to +70°C –55°C to +125°C Unipolar/Bipolar Zero Error 0°C to +70°C (see Tech Note 1) –55°C to +125°C Bipolar Offset Error 0°C to +70°C (see Tech Note 1) –55°C to +125°C Gain Error (see Tech Note 1) 0°C to +70°C –55°C to +125°C Internal Reference Voltage 0°C to +70°C –55°C to +125°C External Current DYNAMIC PERFORMANCE Spurious Free Dynamic Range (–0.5dB) ➁ dc to 100kHz 100kHz to 500kHz 500kHz to 1MHz Total Harm. Distort. (–0.5dB) dc to 100kHz 100kHz to 500kHz 500kHz to 1MHz Input Bandwith (–3dB) Small Signal (–20dB input) Large Signal (–0.5dB input) Feedthrough (1MHz) ➀ See Table 1 also ➁ Same specifications for in-band harmonics. 12 Bits 0 to +70°C — — — — — — — — — — — — +9.97 +9.95 — ±1/2 ±1 ±1/2 ±1 ±0.13 ±0.25 ±0.07 ±0.22 ±0.1 ±0.53 ±0.1 ±0.53 +10.0 — — +2.0 — — — — — — — — +0.8 +5 –600 Volts Volts µA µA MIN. — — 4.5 — TYP. ±5 0 to +10 5 6 MAX. — — — 15 UNITS Volts Volts kΩ pF — — — — — — 2 –68 ±210 — — 155 160 — — — 16 500 165 170 — dB V/µs ns ns ns ns MHz Staight binary/Offset binary Complementary binary Complementary offset binary +2.4 — — — — — — — — +0.4 –160 +6.4 Volts Volts µA mA +14.25 –14.25 +4.75 — — — — — +15.0 –15.0 +5.0 +48 –35 +75 1.6 — +15.75 –15.75 +5.25 +58 –45 +85 1.9 ±0.07 Volts Volts Volts mA mA mA Watts %FSR%V — — — — — — 8 7 –72 –81 –75 –70 –78 –73 –71 10 9 –74 — –70 — — –68 — — — — dB dB dB dB dB dB MHz MHz dB 0 –55 –65 — — — +70 +125 +150 °C °C °C — 3 — °C/W — 23 — °C/W 24-pin, metal-sealed, ceramic DDIP 0.42 ounces (12 grams) Full Scale Amplitude Actual Input Amplitude ➃ For ±12V, +5V operation, contact DATEL 2 ® ® ADS-117 TECHNICAL NOTES 1. Applications which are unaffected by endpoint errors or remove them through software will use the typical connections shown in Figure 3. Remove system errors or adjust the small initial errors of the ADS-117 to zero using the optional external circuitry shown in Figure 4. The external adjustment circuit has no effect on the throughput rate. 2. Always connect the analog and digital grounds to a ground plane beneath the converter for best performance. The analog and digital grounds are not connected to each other internally. 3. Bypass the analog and digital supplies and the +10V reference (pin 21) to ground with 4.7µF, 25V tantalum electrolytic capacitors in parallel with 0.1µF ceramic capacitors. Bypass the +10V reference (pin 21) to ANALOG GROUND (pin 23). 4. Obtain straight binary/offset binary output coding by tying COMP BIN (pin 18) to +5V or leaving it open. The device has an internal pull-up resistor on this pin. To obtain complementary binary or complementary offset binary output coding, tie pin 18 to ground. The pin 18 signal is compatible with CMOS/TTL logic levels for those users desiring dynamic control of this function. Do not change COMP BIN status while EOC is high. 5. To enable the three-state outputs, connect ENABLE (pin 17) to a logic "0" (low). To disable, connect pin 17 to a logic "1" (high). 6. To meet the guaranteed conversion rate, a maximum start convert pulse is specified. A wider start convert pulse will result in slower conversion rates. An initial start convert pulse is required before performing an actual conversion after power-up to assure the sample-hold is in the acquisition mode. Figure 2 shows the relationship between the various input signals. The timing shown applies over the operating temperature range and over the operating power supply range. 7. Re-initiating the START CONVERT (pin 16) while EOC is a logic "1" (high) will result in a new conversion sequence. N START CONVERT 50ns typ., 30ns min., 60ns max. 10ns min. 25ns max. INTERNAL S/H Hold 10ns min. 17ns max. EOC Conversion Time 325ns typ. Acquisition Time 165ns typ. 170ns max. N+1 60ns max. 35ns max. OUTPUT DATA DATA N-1 VALID 350ns min. INVALID DATA 150ns max. DATA N VALID INVALID DATA Note: Scale is approximately 25ns per division. Figure 2. ADS-117 Timing Diagram 3 ® ® ADS-117 CALIBRATION PROCEDURE 1. Connect the converter per Figure 3, Figure 4, and Table 1 for the appropriate input range. Apply a pulse of 150 nanoseconds to the START CONVERT input (pin 16) at a rate of 250kHz. This rate is chosen to reduce flicker if LED’s are used on the outputs for calibration purposes. 2. Zero Adjustments Apply a precision voltage reference source between the amplifier’s analog input and ground. Adjust the output of the reference source per Table 2. For unipolar, adjust the zero trimming potentiometer so that the output code flickers equally between 0000 0000 0000 and 0000 0000 0001 with the pin 18 tied high (straight binary) or between 1111 1111 1111 and 1111 1111 1110 with the pin 18 tied low (complementary binary). For bipolar operation, adjust the potentiometer such that the code flickers equally between 1000 0000 0000 and 1000 0000 0001 with pin 18 tied high (offset binary) or between 0111 1111 1111 and 0111 1111 1110 with pin 18 tied low (complementary offset binary). 3. Full-Scale Adjustment Set the output of the voltage reference used in step 2 to the value shown in Table 1. Adjust the gain trimming potentiometer so that the output code flickers equally between 1111 1111 1110 and 1111 1111 1111 for pin 18 tied high or between 0000 0000 0001 and 0000 0000 0000 for pin 18 tied low. 4. To confirm proper operation of the device, vary the precision reference voltage source to obtain the output coding listed in Table 3. R1 SIGNAL INPUT R2 ➀ ➀ +15V 5kΩ 50Ω GAIN ADJUST 5kΩ 10kΩ ZERO/ OFFSET ADJUST –15V To Pin19 of ADS-117 ➀ For values of R1 and R2 refer to Table 1. Figure 4. Optional Calibration Circuit Table 1. Input Connections (using external calibration) INPUT RANGE 0 +10V, ±5 0 to 5V, ±2.5V 0 to +2.5V, ±1.25V R1 2 2 2 R2 2 6 14 UNIT kΩ kΩ kΩ Table 2. Zero and Gain Adjustments Input Range 0 to +10V ±5V Zero Adjust +1/2 LSB +1.22mV +1.22mV Gain Adjust +FS – 1 1/2 LSB +9.9963V +4.9963V UNIPOLAR OPERATION 20 BIPOLAR INPUT 21 +10V REF. + 0.1µF 4.7µF 12 BIT 1 (MSB) 11 BIT 2 10 BIT 3 9 BIT 4 8 BIT 5 7 BIT 6 6 5 4 3 2 1 15 17 BIT 7 BIT 8 BIT 9 BIT 10 BIT 11 BIT 12 (LSB) EOC ENABLE (1-12) –15V 4.7µF + 4.7µF +15V +5V 4.7µF + 0.1µF 0.1µF 24 ADS-117 23 22 13 16 START CONVERT 19 ANALOG INPUT + 0.1µF 14 COMP BIN 18 +5V NOTE: For unipolar operation, ground pin 20. For bipolar operation, connect pin 20 to pin 21. Always bypass pin 21 as shown for both unipolar and bipolar operation. Figure 3. ADS-117 Connection Diagram 4 ® ® ADS-117 Table 3. Output Coding STRAIGHT BIN. UNIPOLAR SCALE INPUT RANGE 0 to +10V COMP. BINARY LSB INPUT RANGE ±5V BIPOLAR SCALE OUTPUT CODING MSB LSB MSB +FS – 1 LSB +7/8 FS +3/4 FS +1/2 FS +1/4 FS +1/8 FS +1 LSB 0 +9.9976 +8.7500 +7.5000 +5.0000 +2.5000 +1.2500 +0.0024 0.0000 1111 1110 1100 1000 0100 0010 0000 0000 1111 0000 0000 0000 0000 0000 0000 0000 1111 0000 0000 0000 0000 0000 0001 0000 0000 0001 0011 0111 1011 1101 1111 1111 0000 1111 1111 1111 1111 1111 1111 1111 0000 1111 1111 1111 1111 1111 1110 1111 +4.9976 +3.7500 +2.5000 0.0000 –2.5000 –3.7500 –4.9976 –5.0000 +FS –1 LSB +3/4FS +1/2FS 0 –1/2FS –3/4FS –FS+1LSB –FS OFF. BINARY COMP. OFF. BIN. 0 –10 Amplitude Relative to Full Scale (dB) –20 –30 –40 –50 –60 –70 –80 –90 –100 –110 –120 –130 –140 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 Frequency (MHz) (fs = 2MHz, fin = 980kHz, Vin = –0.5dB, 4,096-point FFT) Figure 5. FFT Analysis of ADS-117 5 ® ® ADS-117 MECHANICAL DIMENSIONS INCHES (mm) 1.31 MAX. (33.27) Dimension Tolerances (unless otherwise indicated): 2 place decimal (.XX) ±0.010 (±0.254) 3 place decimal (.XXX) ±0.005 (±0.127) 0.80 MAX. (20.32) 1 12 Lead Material: Kovar alloy Lead Finish: 50 microinches (minimum) gold plating over 100 microinches (nominal) nickel plating 24 13 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) 0.018 ±0.002 (0.457) 0.100 (2.540) 0.040 (1.016) +0.002 –0.001 SEATING PLANE 0.025 (0.635) 0.600 ±0.010 (15.240) 0.100 (2.540) ORDERING INFORMATION MODEL NUMBER ADS-117MC ADS-117MM ADS-117/883 OPERATING TEMP. RANGE 0 to +70°C –55 to +125°C –55 to +125°C ACCESSORIES ADS-EVAL1 HS-24 Evaluation Board (without ADS-117) Heat Sink for all ADS-117 models For MIL-STD-883 product specification or availability of surface-mount packaging, contact DATEL. Receptacles for PC mounting can be ordered through AMP Inc., Part # 3-331272-8 (Component Lead Socket), 24 required. ® ® ISO 9001 ISO REGISTERED DS-0230F 07/04 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:sales@datel.com 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: 6-6354-2025 DATEL China, Shanghai, China Tel:011-86-51317199 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. 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