ADS-112 ETC

Document overview

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Technical content

® ® Figure 1. ADS-112 Functional Block Diagram

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 GENERAL DESCRIPTION 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) 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 high- speed data acquisition systems. 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

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)

+10V REF. 21 START CONVERT 16 EOC 15 DIGITAL CORRECTION LOGIC DAC FLASH ADC COMP BIN 18 BUFFER S/H ANALOG INPUT 19

17 ENABLE (1-12)

+5V SUPPLY +15V SUPPLY ANALOG GROUND DIGITAL GROUND –15V SUPPLY

® ® ADS-112 FUNCTIONAL SPECIFICATIONS (TA = +25°C, ±VCC = ±15V, +VDD =+5V, 1MHz sampling rate, and a minimum 1 minute warmup unless otherwise specified.) ANALOG INPUTS MIN. TYP. MAX. UNITS Input Voltage Range ➀ Bipolar — ±5 — Volts Unipolar — 0 to +10 — Volts Input Impedence 4.5 5 — kΩ Input Capacitance — 6 15 pF DIGITAL INPUTS Logic Levels Logic "1" +2.0 — — Volts Logic "0" — — +0.8 Volts Logic Loading "1" — — +10 µA Logic Loading "0" — — –6 00 µA PERFORMANCE Resolution 12 Bits No Missing Codes (12 Bits; fin = 1MHz) Over the operating temperature range Integral Non-Linearity 0°C to +70°C — ±1/4 ±3/4 LSB Differential Non-Linearity 0°C to +70°C — ±1/4 ±3/4 LSB Full Scale Absolute Accuracy Unipolar Zero Error † Bipolar Zero Error † Bipolar Offset Error † Gain Error † Internal Reference Voltage, +25°C +9.98 +10.0 +10.02 Volts Drift — ±5 ±30 ppm/°C External Current — — 1.5 mA DYNAMIC PERFORMANCE In-Band Harmonics (–0.5dB) dc to 100kHz — –81 –75 dB 100kHz to 500kHz — –75 –70 dB Total Harm. Distort. (–0.5dB) dc to 100kHz — –78 –75 dB 100kHz to 500kHz — –73 –68 dB DYNAMIC PERF. (cont) MIN. TYP. MAX. UNITS Signal-to-Noise Ratio (wo/distort., –0.5dB) dc to 100kHz 68 72 — dB 100kHz to 500kHz 67 71 — dB Signal-to-Noise Ratio ➁ (& distort., –0.5dB) dc to 100kHz 66 70 — dB 100kHz to 500kHz 66 70 — dB Two-tone Intermodulation Distortion (fin = 75kHz, 105kHz, fs = 1MHz, –0.7dB) — –88 –80 dB Two-tone Intermodulation Distortion (fin = 480kHz, 490kHz, fs = 1MHz, –0.7dB) — –68 –65 dB Input Bandwith (–3dB) Small Signal (–20dB input) 8 10 — MHz Large Signal (–0.5dB input) 6 8 — MHz Slew Rate — ±150 — V/µs Apperture Delay TIme — — 20 ns Effect. Aperture Delay Time — — 16 ns Apperture Uncertainity (Jitter) RMS — — 15 ps Peak — — ±50 ps Overvoltage Recovery Time — — 1000 ns S/H Acquisition Time 160 250 280 ns Conversion Rate (Changing Inputs) +25°C 1 — — MHz 0°C to +70°C 1 — — MHz –55°C to +125°C 1 — — MHz DIGITAL OUTPUTS Output Coding Pin 18 High Pin 18 Low 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 ➂ +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 — +24 +35 mA –15V Supply — –40 –48 mA +5V Supply — +80 +95 mA Power Dissipation — 1.3 1.7 Watts Power Supply Rejection — — ±0.07 %FSR%V PHYSICAL/ENVIRONMENTAL Operating Temp. Range, Case ADS-112MC 0 — +70 °C ADS-112MM, 883 –55 — +125 °C Storage Temperature Range –65 — +150 °C Package Type 24-pin, metal-sealed, ceramic DDIP Weight 0.42 ounces (12 grams) ABSOLUTE MAXIMUM RATINGS PARAMETERS LIMITS UNITS +15V Supply (Pin 22) 0 to +18 Volts –15V Supply (Pin 24) 0 to –18 Volts +5V Supply (Pin 13) 0 to +6 Volts Digital Inputs (Pin 16, 17, 18) –0.3 to +V DD +0.3 Volts Analog Input (Pin 19) –9 to +15 Volts Lead Temp. (10 seconds) +300 °C † See Tech Note 1 6.02 (SNR + Distortion) – 1.76 + 20 log Full Scale Amplitude Actual Input Amplitude ➁ Effective bits is equal to: ➀ See Table 3 also ➂ For ±12V, +5V operation, contact DATEL Staight binary/Offset binary Complementary binary Complementary offset binary

Table 4. Output Coding Figure 5. FFT Analysis of ADS-112

® ® ADS-112 ® ® 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. DS-0149F 10/96 MECHANICAL DIMENSIONS INCHES (mm)

ORDERING INFORMATION

ADS-EVAL4 Evaluation Board (without ADS-112) HS-32 Heat Sink for all ADS-112 models MODEL NUMBER OPERATING TEMP. RANGE ADS-112MC 0 to +70°C ADS-112MM –55 to +125°C ADS-112/883 –55 to +125°C 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. 0.200 MAX. (5.080) 0.235 MAX. (5.969) 0.600 ±0.010 (15.240) 0.80 MAX. (20.32) 0.100 TYP. (2.540) 0.100 (2.540) 0.018 ±0.002 (0.457) 0.100 (2.540) 0.040 (1.016) 1.31 MAX. (33.27) 1 12 1324 1.100 (27.940) 0.190 MAX. (4.826) 0.010 (0.254) +0.002 –0.001 SEATING PLANE 0.025 (0.635) Dimension Tolerances (unless otherwise indicated): 2 place decimal (.XX) ±0.010 (±0.254) 3 place decimal (.XXX) ±0.005 (±0.127) Lead Material: Kovar alloy Lead Finish: 50 microinches (minimum) gold plating over 100 microinches (nominal) nickel plating PIN 1 INDEX ISO 9001ISO 9001REGISTERED 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 Data Sheet Fax Back: (508) 261-2857 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