ADS-112 12-Bit, 1MHz, Low-Power Sampling A/D Converters PRODUCT OVERVIEW DATEL’s ADS-112 is a 12-bit, functionally complete, sampling A/D converter that is packaged in a space-saving 24-pin DDIP. Requiring ±15V and +5V supplies, a minimum sampling rate of 1MHz is achieved while only dissipating 1.3 Watts. The ADS-112 digitizes signals up to Nyquist frequencies. Models are available for use in either commercial (0 to + 70°C), industrial (–40 to +100°C), or military (–55 to +125°C) operating temperature ranges. Typical applications include spectrum, transient, vibration and waveform analysis. This device is also ideally suited for radar, sonar, video digitization, medical instrumentation and highspeed data acquisition systems. FEATURES 12-bit resolution No missing codes 1MHz minimum sampling rate Functionally complete Small 24-pin DDIP Low-power, 1.3 Watts Three-state output buffers Samples to Nyquist frequencies INPUT/OUTPUT CONNECTIONS PIN FUNCTION PIN FUNCTION 1 BIT 12 (LSB) 24 –15V SUPPLY 2 BIT 11 23 ANALOG GROUND 3 BIT 10 22 +15V SUPPLY 4 BIT 9 21 +10V REFERENCE 5 BIT 8 20 BIPOLAR 6 BIT 7 19 ANALOG INPUT 7 BIT 6 18 COMP BIN 8 BIT 5 17 ENABLE (1-12) 9 BIT 4 16 START CONVERT 10 BIT 3 15 EOC 11 BIT 2 14 DIGITAL GROUND 12 BIT 1 (MSB) 13 +5V SUPPLY 17 ENABLE (1-12) DAC 12 BIT 1 (MSB) REF S/H S1 BUFFER ANALOG INPUT 19 REGISTER BIPOLAR 20 – + 3-STATE OUTPUT REGISTER FLASH ADC DIGITAL CORRECTION LOGIC S2 11 BIT 2 REGISTER +10V REF. 21 10 BIT 3 9 BIT 4 8 BIT 5 7 BIT 6 6 BIT 7 5 BIT 8 4 BIT 9 3 BIT 10 2 BIT 11 1 BIT 12 (LSB) COMP BIN 18 START CONVERT 16 TIMING AND CONTROL LOGIC EOC 15 13 14 22 23 24 +5V SUPPLY DIGITAL GROUND +15V SUPPLY ANALOG GROUND –15V SUPPLY Figure 1. ADS-112 Functional Block Diagram DATEL, Inc. 11 Cabot Boulevard, Mansfield, MA 02048-1151 USA • Tel: (508) 339-3000 • www.datel.com • e-mail: [email protected] 09 Jul 2015 MDA_ADS-112.C02 Page 1 of 6 ADS-112 12-Bit, 1MHz, Low-Power Sampling A/D Converters ABSOLUTE MAXIMUM RATINGS LIMITS PARAMETERS 0 to +16 +15V Supply (Pin 22) 0 to –16 –15V Supply (Pin 24) 0 to +6 +5V Supply (Pin 13) –0.3 to +VDD +0.3 Digital Inputs (Pin 16, 17, 18) –9 to +15 Analog Input (Pin 19) +300 Lead Temp. (10 seconds) UNITS Volts Volts Volts Volts Volts °C Functional Specifications (TA = +25°C, ±VCC = ±15V, +VDD =+5V, 1MHz sampling rate, and a minimum 1 minute warmup unless otherwise specified.) ANALOG INPUTS Input Voltage Range ➀ Bipolar Unipolar Input Impedence Input Capacitance MIN. TYP. MAX. UNITS — — 4.5 — ±5 0 to +10 5 6 — — — 15 Volts Volts kW pF — — — — — +5 +5 –600 Volts Volts μA μA DIGITAL INPUTS Logic Levels Logic "1" Logic "0" Logic Loading "1" Logic Loading "0" +2.0 — — — PERFORMANCE DYNAMIC PERFORMANCE, CONT. MIN. Signal-to-Noise Ratio (wo/distort., –0.5dB) dc to 100kHz 68 100kHz to 500kHz 67 Signal-to-Noise Ratio (& distort., –0.5dB) ➁ dc to 100kHz 66 100kHz to 500kHz 66 Two-tone Intermodulation Distortion (fin = 75kHz, 105kHz, fs = 1MHz, –0.7dB) — Two-tone Intermodulation Distortion (fin = 480kHz, 490kHz, fs = 1MHz, –0.7dB) — Input Bandwith (–3dB) Small Signal (–20dB input) 8 Large Signal (–0.5dB input) 6 — Slew Rate — Apperture Delay TIme — Effect. Aperture Delay Time TYP. MAX. UNITS 72 71 — — dB dB 70 70 — — dB dB –88 –80 dB –68 –65 dB 10 8 ±150 — — — — — 20 16 MHz MHz V/μs ns ns Apperture Uncertainity (Jitter) RMS — — 15 ps Peak — — ±50 ps — — 1000 ns Overvoltage Recovery Time 160 200 235 ns S/H Acquisition Time Conversion Rate (Changing Inputs) +25°C 1 — — MHz 0°C to +70°C 1 — — MHz –55°C to +125°C 1 — — MHz DIGITAL OUTPUTS Straight binary/Offset binary Data Coding Pin 18 High Complementary binary Pin 18 Low Complementary offset binary Logic Level Logic "1" +2.4 — — Volts Logic "0" — — +0.4 Volts Logic Loading "1" — — –160 μA Logic Loading "0" — — +6.4 mA POWER REQUIREMENTS Power Supply Ranges ③ +15V Supply +14.25 +15.0 +15.75 Volts –15V Supply –14.25 –15.0 –15.75 Volts +5V Supply +4.75 +5.0 +5.25 Volts Power Supply Current +15V Supply — +35 +45 mA –15V Supply — –40 –48 mA +5V Supply — +80 +95 mA — 1.3 1.7 Watts Power Dissipation — — ±0.07 %FSR%V Power Supply Rejection 12 Bits Resolution No Missing Codes Over the operating temperature range (12 Bits; fin = 1MHz) Integral Non-Linearity +25°C — ±1/4 ±3/4 LSB 0°C to +70°C — ±1/4 ±3/4 LSB –55°C to +125°C — ±1/2 ±1.5 LSB Differential Non-Linearity +25°C — ±1/4 ±3/4 LSB 0°C to +70°C — ±1/4 ±3/4 LSB –55°C to +125°C — ±1/2 ±1 LSB Full Scale Absolute Accuracy +25°C — ±0.13 ±0.25 %FSR 0°C to +70°C — ±0.15 ±0.44 %FSR –55°C to +125°C — ±0.5 ±0.9 %FSR Unipolar Zero Error † 0°C to +70°C — ±0.074 ±0.265 %FSR –55°C to +125°C — ±0.224 ±0.73 %FSR Bipolar Zero Error † 0°C to +70°C — ±0.074 ±0.38 %FSR –55°C to +125°C — ±0.124 ±0.73 %FSR PHYSICAL/ENVIRONMENTAL Bipolar Offset Error † Operating Temp. Range, Case 0°C to +70°C — ±0.1 ±0.38 %FSR ADS-112MC, ADS-112MC-C 0 — +70 °C –55°C to +125°C — ±0.3 ±0.73 %FSR ADS-112ME, ADS-112ME-C –40 — +100 °C Gain Error † ADS-112MM, ADS-112MM-C –55 — +125 0°C to +70°C — ±0.1 ±0.38 % ADS-112/883, ADS-112/883-C –55 — +125 –55°C to +125°C — ±0.3 ±0.73 % –65 — +150 °C Storage Temperature Range +9.98 +10.0 +10.02 Volts Internal Reference Voltage, +25°C 24-pin, metal-sealed, ceramic DDIP Package Type Drift — ±5 ±30 ppm/°C External Current — — 1.5 mA 0.42 ounces (12 grams) Weight DYNAMIC PERFORMANCE In-Band Harmonics (–0.5dB) dc to 100kHz — –81 –75 dB 100kHz to 500kHz — –75 –70 dB Total Harm. Distort. (–0.5dB) DATEL, Inc. 11 Cabot Boulevard, Mansfield, MA 02048-1151 USA • Tel: (508) 339-3000 • www.datel.com • e-mail: [email protected] dc to 100kHz — –78 –75 dB 100kHz to 500kHz — –73 –68 dB 09 Jul 2015 MDA_ADS-112.C02 Page 2 of 6 ADS-112 12-Bit, 1MHz, Low-Power Sampling A/D Converters TECHNICAL NOTES 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. 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. Do not change the status of pin 18 when EOC is high. 7. Re-initiating the START CONVERT (pin 16) while EOC is a logic "1" (high) will result in a new conversion sequence. 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-112 to zero using the optional external circuitry shown in Figure 4. The external adjustment circuit has no effect on the throughput rate. 2. For best performance, always connect the analog and digital ground pins to a ground plane beneath the converter. 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 TIMING 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. These times are guaranteed by design. N START CONVERT N+1 150ns, ±25ns 10ns min. 20ns max. Acquisition Time INTERNAL S/H 250ns Hold 20ns max. EOC 60ns max. Conversion Time 600ns max. 35ns max. OUTPUT DATA DATA N-1 VALID DATA N VALID INVALID DATA INVALID DATA 200ns max. 800ns min. Note: Scale is approximately 50ns per division. Figure 2. ADS-112 Timing Diagram DATEL, Inc. 11 Cabot Boulevard, Mansfield, MA 02048-1151 USA • Tel: (508) 339-3000 • www.datel.com • e-mail: [email protected] 09 Jul 2015 MDA_ADS-112.C02 Page 3 of 6 ADS-112 12-Bit, 1MHz, Low-Power Sampling A/D Converters CALIBRATION PROCEDURE R2 ~ 1. Connect the converter per Figures 3 and 4 and Tables 1 and 3 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 the flicker if LED’s are used on the outputs for calibration purposes. +15V ~ R1 SIGNAL INPUT 2. Zero Adjustments To Pin19 of ADS-112 5k7 507 GAIN ADJUST 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 COMP BIN (pin 18) tied high (straight binary) or between 1111 1111 1111 and 1111 1111 1110 with pin 18 tied low (complementary binary). –15V 5k7 10k7 ZERO/ OFFSET ADJUST 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). ~ For values of R1 and R2 refer to Table 3. Figure 4. Optional Calibration Circuit 3. Full-Scale Adjustment Table 2. Zero and Gain Adjust Set the output of the voltage reference used in step 2 to the value shown in Table 2. 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. INPUT RANGE ZERO ADJUST +1/2 LSB GAIN ADJUST +FS – 1 1/2 LSB 0 to +10V +1.22mV +9.9963V ±5V +1.22mV +4.9963V To confirm proper operation of the device, vary the precision reference voltage source to obtain the output coding listed in Table 4. Table 3. Input Range (using external calibration) Table 1. Input Range Selection INPUT RANGE INPUT PIN ±5v Pin 19 0 to +10V Pin 19 BIPOLAR OPERATION INPUT RANGE R1 R2 UNIT 0 to 10V, ±5 2 2 kW Pin 20 to Pin 21 0 to 5V, ±2.5V 2 6 kW Pin 20 to Ground 0 to +2.5V, ±1.25V 2 14 kW TIE TOGETHER UNIPOLAR OPERATION 20 12 BIT 1 (MSB) 11 BIT 2 10 BIT 3 9 BIT 4 8 BIT 5 7 BIT 6 6 BIT 7 5 BIT 8 4 BIT 9 3 BIT 10 2 BIT 11 1 BIT 12 (LSB) 15 EOC 17 ENABLE (1-12) 20 21 + 0.1μF 21 +10V REF. 4.7μF 24 –15V 4.7μF + 0.1μF + 0.1μF 4.7μF +15V +5V 22 16 START CONVERT 19 ANALOG INPUT 13 + 4.7μF ADS-112 23 0.1μF COMP BIN 18 14 +5V Note: Always bypass pin 21 to ground Figure 3. Typical ADS-112 Connection Diagram DATEL, Inc. 11 Cabot Boulevard, Mansfield, MA 02048-1151 USA • Tel: (508) 339-3000 • www.datel.com • e-mail: [email protected] 09 Jul 2015 MDA_ADS-112.C02 Page 4 of 6 ADS-112 12-Bit, 1MHz, Low-Power Sampling A/D Converters Table 4. Output Coding STRAIGHT BIN. COMP. BINARY UNIPOLAR INPUT RANGE OUTPUT CODING INPUT RANGE BIPOLAR SCALE 0 to +10V MSB LSB MSB ±5V SCALE +FS – 1 LSB +9.9976 1111 1111 1111 +7/8 FS +8.7500 1110 0000 0000 0000 0000 0000 +4.9976 +FS –1 LSB 0001 1111 1111 +3.7500 +3/4FS +3/4 FS +7.5000 1100 0000 0000 0011 1111 1111 +2.5000 +1/2FS +1/2 FS +5.0000 1000 0000 0000 0111 1111 1111 0.0000 0 +1/4 FS +1/8 FS +2.5000 0100 0000 0000 1011 1111 1111 –2.5000 –1/2FS +1.2500 0010 0000 0000 1101 1111 1111 –3.7500 –3/4FS +1 LSB +0.0024 0000 0000 0001 1111 1111 1110 –4.9976 –FS+1LSB 0 0.0000 0000 0000 0000 1111 1111 1111 –5.0000 –FS OFF. BINARY LSB COMP. OFF. BIN. 0 Amplitude Relative to Full Scale (dB) –10 –20 –30 –40 –50 –60 –70 –80 –90 –100 –110 –120 –130 0 50 100 150 200 250 300 350 400 450 500 Frequency (kHz) (fs = 1MHz, fin = 485kHz, Vin = –0.5dB, 4,096-point FFT) Figure 5. FFT Analysis of ADS-112 DATEL, Inc. 11 Cabot Boulevard, Mansfield, MA 02048-1151 USA • Tel: (508) 339-3000 • www.datel.com • e-mail: [email protected] 09 Jul 2015 MDA_ADS-112.C02 Page 5 of 6 ADS-112 12-Bit, 1MHz, Low-Power Sampling A/D Converters MECHANICAL DIMENSIONS INCHES (mm) 1.31 MAX. (33.27) 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) 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) 0.040 (1.016) 0.018 ±0.002 (0.457) SEATING PLANE 0.025 (0.635) +0.002 –0.001 0.600 ±0.010 (15.240) 0.100 (2.540) ORDERING GUIDE MODEL NUMBER ADS-112MC ADS-112MC-C ADS-112ME ADS-112ME-C ADS-112MM ADS-112MM-C ADS-112/883 ADS-112-C/883 DATEL is a registered trademark of DATEL, Inc. 11 Cabot Boulevard, Mansfield, MA 02048-1151 USA TEMPERATURE RANGE 0 to +70°C 0 to +70°C –40 to +100°C –40 to +100°C –55 to +125°C –55 to +125°C –55 to +125°C –55 to +125°C PACKAGE DDIP DDIP DDIP DDIP DDIP DDIP DDIP DDIP ROHS No Yes No Yes No Yes No Yes 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 licenses to make, use, or sell equipment constructed in accordance therewith. Specifications are subject to change without notice. ITAR and ISO 9001/14001 REGISTERED © 2015 DATEL, Inc. www.datel.com • e-mail: [email protected] 09 Jul 2015 MDA_ADS-112.C02 Page 6 of 6