ADS-118 MURATA-PS | Alldatasheet

Document overview

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Technical content

Figure 1. ADS-118/118A Functional Block Diagram

FEATURES

  • •••• 5MHz minimum sampling rate
  • •••• Functionally complete
  • •••• Requires only ±5V supplies
  • •••• Low-power, 1.8 Watts
  • •••• Outstanding dynamic performance
  • •••• No missing codes over full military temperature range
  • •••• Edge-triggered, no pipeline delay
  • •••• Ideal for both time and frequency-domain applications GENERAL DESCRIPTION DATEL's ADS-118 and ADS-118A are 12-bit, 5MHz, sampling A/D converters packaged in space-saving 24-pin DDIP’s. The ADS-118 offers an input range of ±1V and has three-state outputs. The ADS-118A has an input range of ±1.25V and features direct adjustment of offset error. These functionally complete low-power devices (1.8 Watts) contain an internal fast-settling sample/hold amplifier, a 12-bit subranging A/D converter, a precise voltage reference, timing/ control logic, and error-correction circuitry. All timing and control logic operates from the rising edge of a single start convert pulse. Digital input and output levels are TTL. Models are available for use in either commercial (0 to +70°C) or military (–55 to +125°C) operating temperature ranges. Applications include radar, transient signal analysis, process control, medical/graphic imaging, and FFT spectrum analysis. /C174 /C174 /C73/C78/C78/C79/C86/C32/C65/C32/C84/C73/C79/C78/C32/C97/C110/C100/C32/C69/C88/C32/C67/C69/C76/C76/C69/C78/C67/C69 ADS-118, ADS-118A 12-Bit, 5MHz, Low-Power Sampling A/D Converters 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 INPUT/OUTPUT CONNECTIONS PIN FUNCTION PIN FUNCTION

1 BIT 12 (LSB) 24 NO CONNECTION

2 BIT 11 23 ANALOG GROUND

3 BIT 10 22 NO CONNECTION

4 BIT 9 21 +5V ANALOG SUPPL Y

5 BIT 8 20 –5V SUPPL Y

6 BIT 7 19 ANALOG INPUT

7 BIT 6 18 ANALOG GROUND

8 BIT 5 17 ENABLE/OFFSET ADJ.

9 BIT 4 16 START CONVERT

10 BIT 3 15 EOC

11 BIT 2 14 DIGITAL GROUND

12 BIT 1 (MSB) 13 +5V DIGITAL SUPPL Y

  • ADS-118, Pin 17 is ENABLE ADS-118A, Pin 17 is OFFSET ADJUST REF DAC REGISTERREGISTER 3-STATE OUTPUT REGISTER

12 BIT 1 (MSB)

11 BIT 2

10 BIT 3

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)

/C83 AMP +5V ANALOG SUPPLY –5V SUPPLY 18, 23 ANALOG GROUND +5V DIGITAL SUPPLY DIGITAL GROUND 22, 24 NO CONNECT (ADS-118A only)

17 ENABLE

(ADS-118A only)

® ® PARAMETERS MIN. TYP. MAX. UNITS Operating Temp. Range, Case ADS-118/118AMC 0 — +70 °C ADS-118/118AMM, GM, 883 –55 — +125 °C Thermal Impedance θjc — 2 — °C/Watt θca — 23 — °C/Watt Storage Temperature Range –65 — +150 °C Package Type 24-pin, metal-sealed, ceramic DDIP or SMT Weight 0.42 ounces (12 grams) ABSOLUTE MAXIMUM RATINGS PARAMETERS LIMITS UNITS +5V Supply (Pins 13, 21) 0 to +6 Volts –5V Supply (Pin 20) 0 to –6 Volts Digital Input (Pin 16, 17) –0.3 to +V DD +0.3 Volts Analog Input (Pin 19) ±5 Volts Lead Temperature (10 seconds) +300 °C PHYSICAL/ENVIRONMENTAL +25°C 0 to +70°C –55 to +125°C Input Voltage Range, ADS-118 ➁ — ±1 — — ±1 — — ±1 — Volts Input Resistance 475 500 — 475 500 — 475 500 — Ω Input Capacitance — 6 15 — 6 15 — 6 15 pF DIGITAL INPUT Logic Levels Logic Loading "1" — — +20 — — +20 — — +20 µA Start Convert Positive Pulse Width ➂ 50 100 — 50 100 — 50 100 — ns STATIC PERFORMANCE Resolution — 12 — — 12 — — 12 — Bits Integral Nonlinearity (fin = 10kHz) — ±0.75 — — ±1.0 — — ±1.5 — LSB No Missing Codes (fin = 10kHz) 12 — — 12 — — 12 — — Bits DYNAMIC PERFORMANCE Peak Harmonics (–0.5dB) dc to 500kHz — –76 –71 — –74 –70 — –72 –66 dB 500kHz to 1MHz — –75 –71 — –74 –70 — –70 –65 dB 1MHz to 2.5MHz — –69 –69 — –73 –67 — –66 –60 dB Total Harmonic Distortion (–0.5dB) dc to 500kHz — –72 –68 — –71 –67 — –70 –65 dB 500kHz to 1MHz — –71 –67 — –70 –66 — –67 –63 dB 1MHz to 2.5MHz — –70 –66 — –69 –65 — –66 –60 dB Signal-to-Noise Ratio (w/o distortion, –0.5dB) dc to 500kHz 67 69 — 66 69 — 64 67 — dB 500kHz to 1MHz 66 69 — 65 68 — 63 66 — dB 1MHz to 2.5MHz 66 69 — 65 68 — 63 66 — dB Signal-to-Noise Ratio (& distortion, –0.5dB) dc to 500kHz 65 68 — 64 67 — 62 66 — dB 500kHz to 1MHz 65 68 — 64 67 — 61 65 — dB 1MHz to 2.5MHz 64 67 — 63 66 — 60 64 — dB Noise — 195 — — 195 — — 195 — µVrms Two-tone Intermodulation Distortion (f in = 1MHz, Input Bandwidth (–3dB) Small Signal (–20dB input) — 20 — — 20 — — 20 — MHz Large Signal (–0.5dB input) — 10 — — 10 — — 10 — MHz Feedthrough Rejection (f in = 2.5MHz) — 80 — — 80 — — 80 — dB Aperture Delay Time — +10 — — +10 — — +10 — ns Aperture Uncertainty —3— — 3 ——3 — p s r m s FUNCTIONAL SPECIFICATIONS (TA = +25°C, ±VDD = ±5V, 5MHz sampling rate, and a minimum 3 minute warmup ➀ unless otherwise specified.)

® ® the adjustment circuitry shown in Figures 2a and 2b. For operation without adjustment, tie pin 17 to analog ground. When using this circuitry, or any similar offset and gain- calibration hardware, make adjustments following warmup. To avoid interaction, always adjust offset before gain. 3. To enable the three-state outputs, connect ENABLE (pin 17) to a logic "0" (low). To disable, connect pin 17 to logic "1" (high). The three-state outputs are permanently enabled in the ADS-118A. 4. Applying a start convert pulse while a conversion is in progress (EOC = logic "1") will initiate a new and inaccu- rate conversion cycle. +25°C 0 to +70°C –55 to +125°C S/H Acquisition Time ( to ±0.001%FSR, 10V step) — 85 90 — 85 90 — 85 90 ns Overvoltage Recovery Time ➄ — 200 — — 200 — — 200 — ns A/D Conversion Rate 5 — — 5 — — 5 — — MHz DIGITAL OUTPUTS Logic Levels Logic Loading "0" — — +4 — — +4 — — +4 mA Delay, Falling Edge of EOC to Output Data Valid — — 20 — — 20 — — 20 MHz Delay, Falling Edge of ENABLE to Output Data Valid — — 10 — — 10 — — 10 MHz Output Coding Offset Binary POWER REQUIREMENTS Power Supply Ranges ➅ Power Supply Currents +5V Supply — +205 +220 — +205 +220 — +205 +220 mA Power Supply Rejection — — ±0.1 — — ±0.1 — — ±0.1 %FSR/%V Footnotes: ➄ This is the time required before the A/D output data is valid once the analog input is back within the specified range. ➅ The minimum supply voltages of +4.9V and –4.9V for ±VDD are required for –55°C operation only. The minimum limits are +4.75V and –4.75V when operating at +125°C 6.02 (SNR + Distortion) – 1.76 + 20 log Full Scale Amplitude Actual Input Amplitude ➀ All power supplies should be on before applying a start convert pulse. All supplies and the clock (start convert pulses) must be present during warmup periods. The device must be continuously converting during this time. ➁ Input voltage ranges for ADS-118A is ±1.25V ➂ A 100ns wide start convert pulse is used for all production testing. For applications requiring less than an 5MHz sampling rate, wider start convert pulses can be used. NOTE: The device only requires the rising edge of a start convert pulse to operate. ➃ Effective bits is equal to: TECHNICAL NOTES 1. Obtaining fully specified performance from the ADS-118 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. 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. 2. The ADS-118 achieves its specified accuracies without the need for external calibration. If required, the device’s small initial offset and gain errors can be reduced to zero using

Figure 7. ADS-118/118A Evaluation Board Schematic (ADS-B118)

® ® /C174 /C174 /C73/C78/C78/C79/C86/C32/C65/C32/C84/C73/C79/C78/C32/C97/C110/C100/C32/C69/C88/C32/C67/C69/C76/C76/C69/C78/C67/C69 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 DA TEL, Inc. trademark. MECHANICAL DIMENSIONS INCHES (mm) 24-Pin DDIP Versions 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) 11 2 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

ORDERING INFORMATION

MODEL NUMBER TEMP. RANGE PACKAGE ADS-118MC 0 to +70°C DDIP ADS-118MM –55 to +125°C DDIP ADS-118AMC 0 to +70°C SMT ADS-118AMM –55 to +125°C SMT ACCESSORIES ADS-B118 Evaluation Board (without ADS-118) HS-24 Heat Sink for all ADS-118 DDIP models Receptacles for PC board mounting can be ordered through AMP , Inc., Part # 3-331272-8 (Component Lead Socket), 24 required. For MIL-STD-883 product, or surface mount packaging, contact DATEL. 24-Pin Surface Mount Versions ADS-118MC ADS-118MM ADS-118AMC ADS-118AMM DS-0231F 2/06 ISO 9001ISO 9001 /C82/C69/C71/C73/C83/C84/C69/C82/C69/C68 0.80 MAX. (20.32) 0.015 (0.381) MAX. radius for any pin 1.31 MAX. (33.02) 0.100 TYP. (2.540) 0.100 (2.540) 0.190 MAX. (4.826) 0.040 (1.016) 0.020 TYP. (0.508) 0.020 (0.508) 24 13 121 PIN 1 INDEX 0.130 TYP. (3.302) 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 0.060 TYP. (1.524) 0.010 TYP. (0.254)