ADS-926MC

® ® ADS-916 14-Bit, 500kHz, Low-Power Sampling A/D Converters FEATURES • • • • • • • • 14-bit resolution 500kHz sampling rate Functionally complete; No missing codes Edge-triggered; No pipeline delays Small 24-pin DDIP or SMT package Low power, 1.8 Watts maximum Operates from ±15V or ±12V supplies Unipolar 0 to +10V input range GENERAL DESCRIPTION The ADS-916 is a high-performance, 14-bit, 500kHz sampling A/D converter. This device samples input signals up to Nyquist frequencies with no missing codes. The ADS-916 features outstanding dynamic performance including a THD of –90dB. Housed in a small 24-pin DDIP or SMT (gull-wing) package, the functionally complete ADS-916 contains a fast-settling sample-hold amplifier, a subranging (two-pass) A/D converter, a precise voltage reference, timing/control logic, and errorcorrection circuitry. Digital input and output levels are TTL. Requiring ±15V (or ±12V) and +5V supplies, the ADS-916 dissipates 1.8W (1.6W for ±12V) maximum. The unit is offered with a unipolar input (0 to +10V). Models are available for use in either commercial (0 to +70°C) or military (–55 to +125°C) operating temperature ranges. Applications include radar, sonar, spectrum analysis, and graphic/medical imaging. PIN 1 2 3 4 5 6 7 8 9 10 11 12 INPUT/OUTPUT CONNECTIONS FUNCTION BIT 14 (LSB) BIT 13 BIT 12 BIT 11 BIT 10 BIT 9 BIT 8 BIT 7 BIT 6 BIT 5 BIT 4 BIT 3 PIN 24 23 22 21 20 19 18 17 16 15 14 13 FUNCTION –12V/–15V SUPPLY ANALOG GROUND +12V/+15V SUPPLY +10V REFERENCE OUT ANALOG INPUT ANALOG GROUND BIT 1 (MSB) BIT 2 START CONVERT EOC DIGITAL GROUND +5V SUPPLY DAC 18 BIT 1 (MSB) 17 BIT 2 +10V REF. OUT 21 REF S2 FLASH ADC S/H ANALOG INPUT 20 – REGISTER + S1 BUFFER DIGITAL CORRECTION LOGIC 12 BIT 3 11 BIT 4 10 BIT 5 9 8 7 6 5 4 3 2 1 BIT 6 BIT 7 BIT 8 BIT 9 BIT 10 BIT 11 BIT 12 BIT 13 BIT 14 (LSB) START CONVERT 16 TIMING AND CONTROL LOGIC EOC 15 13 +5V SUPPLY 14 DIGITAL GROUND 22 +12V/+15V SUPPLY 19, 23 ANALOG GROUND REGISTER 24 –12V/–15V SUPPLY Figure 1. ADS-916 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-916 ABSOLUTE MAXIMUM RATINGS PARAMETERS +12V/+15V Supply (Pin 22) –12V/–15V Supply (Pin 24) +5V Supply (Pin 13) Digital Input (Pin 16) Analog Input (Pin 20) Lead Temperature (10 seconds) LIMITS 0 to +16 0 to –16 0 to +6 –0.3 to +VDD +0.3 –4 to +17 +300 UNITS Volts Volts Volts Volts Volts °C PHYSICAL/ENVIRONMENTAL PARAMETERS Operating Temp. Range, Case ADS-916MC, GC ADS-916MM, GM Thermal Impedance θjc θca Storage Temperature Package Type Weight MIN. 0 –55 TYP. — — MAX. +70 +125 UNITS °C °C 6 °C/Watt 24 °C/Watt –65 — +150 °C 24-pin, metal-sealed, ceramic DDIP or SMT 0.42 ounces (12 grams) FUNCTIONAL SPECIFICATIONS (TA = +25°C, ±VCC = ±15V (or ±12V), +VDD = +5V, 500kHz sampling rate, and a minimum 1 minute warmup Œ unless otherwise specified.) +25°C ANALOG INPUT Input Voltage Range  Input Resistance Input Capacitance DIGITAL INPUT Logic Levels Logic "1" Logic "0" Logic Loading "1" Logic Loading "0" Start Convert Positive Pulse Width Ž STATIC PERFORMANCE Resolution Integral Nonlinearity (fin = 10kHz) Differential Nonlinearity (fin = 10kHz) Full Scale Absolute Accuracy Unipolar Offset Error (Tech Note 2) Gain Error (Tech Note 2) No Missing Codes (fin = 10kHz) DYNAMIC PERFORMANCE Peak Harmonics (–0.5dB) dc to 100kHz 100kHz to 250kHz Total Harmonic Distortion (–0.5dB) dc to 100kHz 100kHz to 250kHz Signal-to-Noise Ratio (w/o distortion, –0.5dB) dc to 100kHz 100kHz to 250kHz Signal-to-Noise Ratio  (& distortion, –0.5dB) dc to 100kHz 100kHz to 250kHz Two-Tone Intermodulation Distortion (fin = 100kHz, 240kHz, fs = 500kHz –0.5dB) Noise Input Bandwidth (–3dB) Small Signal (–20dB input) Large Signal (–0.5dB input) Feedthrough Rejection (fin = 250kHz) Slew Rate Aperture Delay Time Aperture Uncertainty S/H Acquisition Time (to ±0.003%FSR, 10V step) Overvoltage Recovery Time  A/D Conversion Rate — — — — 77 75 77 72 — — — — — — — — 1530 — 500 –91 –84 –90 –82 81 80 80 78 –86 310 7 3 84 ±40 ±20 5 1570 1400 — –86 –79 –85 –77 — — — — — — — — — — — — 1610 2000 — — — — — 77 75 77 72 — — — — — — — — 1530 — 500 –91 –84 –90 –82 81 80 80 78 –86 310 7 3 84 ±40 ±20 5 1570 1400 — –86 –79 –85 –77 — — — — — — — — — — — — 1610 2000 — — — — — 76 74 75 70 — — — — — — — — 1530 — 500 –90 –82 –87 –80 80 78 78 76 –86 360 7 3 84 ±40 ±20 5 1570 1400 — –82 –76 –81 –74 — — — — — — — — — — — — 1610 2000 — dB dB dB dB dB dB dB dB dB µVrms MHz MHz dB V/µs ns ps rms ns ns kHz — — — — — — 14 14 ±0.5 ±0.5 ±0.05 ±0.1 ±0.1 — — — ±0.95 ±0.1 ±0.2 ±0.25 — — — — — — — 14 14 ±0.75 ±0.5 ±0.1 ±0.1 ±0.1 — — — ±0.95 ±0.2 ±0.2 ±0.25 — — — –0.95 — — — 14 14 ±1.5 ±0.75 ±0.15 ±0.15 ±0.25 — — — +1.25 ±0.4 ±0.4 ±0.4 — Bits LSB LSB %FSR %FSR % Bits +2.0 — — — 50 — — — — 200 — +0.8 +20 –20 — +2.0 — — — 50 — — — — 200 — +0.8 +20 –20 — +2.0 — — — 50 — — — — 200 — +0.8 +20 –20 — Volts Volts µA µA ns MIN. — — — TYP. 0 to +10 1 7 MAX. — — 15 MIN. — — — 0 to +70°C TYP. 0 to +10 1 7 MAX. — — 15 MIN. — — — –55 to +125°C TYP. 0 to +10 1 7 MAX. — — 15 UNITS Volts kΩ pF 2 ® ® ADS-916 +25°C ANALOG OUTPUT Internal Reference Voltage Drift External Current DIGITAL OUTPUTS Logic Levels Logic "1" Logic "0" Logic Loading "1" Logic Loading "0" Delay, Falling Edge of EOC to Output Data Valid Output Coding POWER REQUIREMENTS, ±15V Power Supply Ranges +15V Supply –15V Supply +5V Supply Power Supply Currents +15V Supply –15V Supply +5V Supply Power Dissipation Power Supply Rejection POWER REQUIREMENTS, ±12V Power Supply Ranges +12V Supply –12V Supply +5V Supply Power Supply Currents +12V Supply –12V Supply +5V Supply Power Dissipation Power Supply Rejection +11.5 –11.5 +4.75 — — — — — +12.0 –12.0 +5.0 +50 –40 +70 1.4 — +12.5 –12.5 +5.25 +65 –50 +80 1.6 ±0.01 +11.5 –11.5 +4.75 — — — — — +12.0 –12.0 +5.0 +50 –40 +70 1.4 — +12.5 –12.5 +5.25 +65 –50 +80 1.6 ±0.01 +11.5 –11.5 +4.75 — — — — — +12.0 –12.0 +5.0 +50 –40 +70 1.4 — +12.5 –12.5 +5.25 +65 –50 +80 1.6 ±0.01 Volts Volts Volts mA mA mA Watts %FSR/%V +14.5 –14.5 +4.75 — — — — — +15.0 –15.0 +5.0 +50 –40 +70 1.6 — +15.5 –15.5 +5.25 +65 –50 +85 1.8 ±0.01 +14.5 –14.5 +4.75 — — — — — +15.0 –15.0 +5.0 +50 –40 +70 1.6 — +15.5 –15.5 +5.25 +65 –50 +85 1.8 ±0.01 +14.5 –14.5 +4.75 — — — — — +15.0 –15.0 +5.0 +50 –40 +70 1.6 — +15.5 –15.5 +5.25 +65 –50 +85 1.8 ±0.01 Volts Volts Volts mA mA mA Watts %FSR/%V +2.4 — — — — — — — — — — +0.4 –4 +4 35 +2.4 — — — — — — — — — Straight Binary — +0.4 –4 +4 35 +2.4 — — — — — — — — — — +0.4 –4 +4 35 Volts Volts mA mA ns MIN. +9.95 — — TYP. +10.0 ±5 — MAX. +10.05 — 1.5 MIN. +9.95 — — 0 to +70°C TYP. +10.0 ±5 — MAX. +10.05 — 1.5 MIN. +9.95 — — –55 to +125°C TYP. +10.0 ±5 — MAX. +10.05 — 1.5 UNITS Volts ppm/°C mA Footnotes: Œ 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 a slight degradation in performance when using ±12V supplies.  See Ordering Information for availability of ±5V input range. Contact DATEL for availability of other input voltage ranges. Ž A 500 kHz clock with 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). See Timing Diagram for more details.  Effective bits is equal to: (SNR + Distortion) – 1.76 + 20 log 6.02 Full Scale Amplitude Actual Input Amplitude  This is the time required before the A/D output data is valid after the analog input is back within the specified range. TECHNICAL NOTES 1. Obtaining fully specified performance from the ADS-916 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, 19 and 23) directly to a large analog ground plane beneath the package. Bypass all power supplies and the REFERENCE OUTPUT (pin 21) 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. If the user-installed offset and gain adjusting circuit shown in Figure 2 is used, also locate it as close to the ADS-916 as possible. 2. The ADS-916 achieves its specified accuracies without the need for external calibration. If required, the device's small 3 initial offset and gain errors can be reduced to zero using the input circuit of Figure 2. When using this circuit, or any similar offset and gain-calibration hardware, make adjustments following warmup. To avoid interaction, always adjust offset before gain. 3. When operating the ADS-916 from ±12V supplies, do not drive external circuitry with the REFERENCE OUTPUT. The reference's accuracy and drift specifications may not be met, and loading the circuit may cause accuracy errors within the converter. 4. Applying a start convert pulse while a conversion is in progress (EOC = logic "1") initiates a new and inaccurate conversion cycle. Data for the interrupted and subsequent conversions will be invalid. ® ® ADS-916 CALIBRATION PROCEDURE (Refer to Figures 2 and 3) 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 circuit of Figure 2 are guaranteed to compensate for the ADS-916's initial accuracy errors and may not be able to compensate for additional system errors. All fixed resistors in Figure 2 should be metal-film types, and multiturn potentiometers should have TCR’s of 100ppm/°C or less to minimize drift with temperature. 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. For the ADS-916, offset adjusting is normally accomplished at the point where the 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 +½LSB (+305µV). 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 1½ LSB's (+9.999085V). +15V ZERO/ OFFSET ADJUST 20kΩ 200kΩ 2kΩ Zero/Offset Adjust Procedure 1. Apply a train of pulses to the START CONVERT input (pin 16) so the converter is continuously converting. If using LED's on the outputs, a 200kHz conversion rate will reduce flicker. 2. Apply +305µV to the ANALOG INPUT (pin 20). 3. Adjust the offset potentiometer until the output bits are all 0's and the LSB flickers between 0 and 1. Gain Adjust Procedure 1. Apply +9.999085V to the ANALOG INPUT (pin 20). 2. Adjust the gain potentiometer until the output bits are all 1's and the LSB flickers between 1 and 0. Table 1. Zero and Gain Adjust INPUT VOLTAGE RANGE 0 to +10V ZERO ADJUST +½ LSB +305µV GAIN ADJUST +FS –1½ LSB +9.999085V Table 2. Output Coding INPUT VOLTAGE (0 to +10V) +9.999390 +7.500000 +5.000000 +2.500000 +0.000610 0.000000 UNIPOLAR SCALE +FS –1LSB +3/4 FS +1/2 FS +1/4 FS +1LSB 0 DIGITAL OUTPUT MSB LSB 11 11 10 01 00 00 1111 0000 0000 0000 0000 0000 1111 1111 0000 0000 0000 0000 0000 0000 0000 0001 0000 0000 –15V GAIN ADJUST +15V 1.98kΩ 50Ω To Pin 20 of ADS-916 SIGNAL INPUT Coding is straight binary; 1LSB = 610µV. –15V Figure 2. ADS-916 Calibration Circuit 18 BIT 1 (MSB) +5V 4.7µF + 0.1µF 14 DIGITAL GROUND 13 17 BIT 2 12 BIT 3 11 BIT 4 10 BIT 5 9 BIT 6 8 BIT 7 7 BIT 8 6 BIT 9 5 BIT 10 4 BIT 11 3 BIT 12 2 BIT 13 1 BIT 14 (LSB) 15 EOC START 16 CONVERT –12V/–15V 4.7µF + 4.7µF + +12V/+15V 0 to +10V 0.1µF 24 ADS-916 ANALOG GROUND 19, 23 0.1µF 22 ANALOG 20 INPUT 21 +10V REF. OUT 0.1µF + 4.7µF Figure 3. Typical ADS-916 Connection Diagram 4 ® ® ADS-916 THERMAL REQUIREMENTS 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. 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. Electrically-insulating, 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. 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. N START CONVERT 200ns typ. 10ns typ. INTERNAL S/H Hold 430ns typ. Acquisition Time 1570ns ±40ns 70ns ±10ns 90ns typ. EOC Conversion Time 420ns ±20ns 35ns max. 74ns max. OUTPUT DATA Data (N – 1) Valid Invalid Data Data N Valid (1926ns min.) N+1 Notes: 1. fs = 500kHz. 2. The ADS-916 is an edge-triggered device. All internal operations are triggered by the rising edge of the start convert pulse, which may be as narrow as 50nsec. All production testing is performed at a 500kHz sampling rate with 200nsec wide start pulses. For lower sampling rates, wider start pulses may be used, however, a minimum pulse width low of 50nsec must be maintained. Figure 4. ADS-916 Timing Diagram 5 +15V R3 200K 5% 12 13 +5V U2 74LS240 20 1Y1 33 31 1Y2 1Y3 1Y4 2Y1 2Y2 2Y3 2Y4 1G 10 +5V U3 74LS240 2 4 6 8 11 13 15 17 19 1A1 1A2 1A3 1A4 2A1 2A2 2A3 2A4 2G P2 1 3 5 B7 7 B6 9 B5 24 22 20 12 B4 26 14 B3 28 MSB 29 27 25 23 21 19 16 30 B2 SG3 18 32 B1 SG2 2 1A1 1A2 1A3 1A4 2A1 2A2 2A3 2A4 2G 4 6 6 AD845 4 13 11 +5V 8 C16 0.1MF +15V 74LS86 U4 11 R5 2K .1% C2 15pF COG ADS-916 OFFSET ADJ R2 20K C1 0.1MF -15V C4 2.2MF P4 50 2 – U5 + 3 7 0.1% R6 2K 0.1% R4 1.98K + C3 0.1MF ANALOG INPUT GAIN ADJ R1 + J5 C21 0.1MF 15 17 19 13 14 3 15 16 17 18 19 C9 2.2MF 20 21 22 C12 0.1MF 23 24 -15V +15V +5V C15 0.1MF P3 J1 1 J2 2 C24 7 NOTES: Y1 1 SEE NOTE 1 XTAL 7 8 +5V C18 0.1MF 14 + 2.2MF 74LS86 U4 3 14 74LS86 4 5 U4 6 C13 0.1MF C14 2.2MF 20 1Y1 1Y2 1Y3 1Y4 2Y1 2Y2 2Y3 2Y4 1G 10 18 16 14 12 9 7 5 3 1 B8 B9 B10 B11 B12 B13 B14 C23 0.1MF + 0.1% C17 0.1MF R7 10K 0.1% 7 6 OP-77 4 +5V C22 2.2 -15V MF U6 – 2 R8 10K -15V C6 2.2MF + +15V C5 0.1MF C7 0.1MF C8 2.2MF C19 2.2MF + C20 0.1MF P1 18 16 14 12 10 8 6 17 15 13 11 2 4 1 3 6 C10 0.1MF -15V 5 + 8 7 10 9 + + + 6 +15V C11 2.2MF 9 10 1. SG1 SHOULD BE OPEN. SG2 & SG3 SHOULD BE CLOSED. 2. FOR ADS-916 Y1 IS 500 KHZ. FOR ADS-917 Y1 IS 1 MHZ. FOR ADS-919/929 Y1 IS 2 MHZ. 9 7 LSB 5 4 EOC 3 2 ST.CONV. 1 12 11 14 13 ADS-916/917/919/929 12 +5V B3 11 DGND B4 10 EOC B5 9 ST. CONV B6 8 B2 B7 7 U1 B1 B8 6 AGND B9 5 INPUT B10 4 +10VREF B11 3 +15V B12 2 AGND B13 1 -15V B14 16 15 18 17 20 19 34 ENABLE 22 21 24 23 J3 8 U4 74LS86 J4 25 26 START CONVERT ® SG1 Figure 5. ADS-916 Evaluation Board Schematic ® ® ® ADS-916 0 –10 –20 Amplitude Relative to Full Scale (dB) –30 –40 –50 –60 –70 –80 –90 –100 –110 –120 –130 –140 –150 –160 –170 0 25 50 75 100 125 150 175 200 225 250 Frequency (kHz) (fs = 500kHz, fin = 240kHz, Vin = –0.5dB, 16,384-point FFT) Figure 6. ADS-916 FFT Analysis +0.34 DNL (LSB's) 0 Number of Occurrences –0.33 0 Digital Output Code 16,384 0 Digital Output Code 16,384 Figure 7. ADS-916 Histogram and Differential Nonlinearity 7 ® ® ADS-916 MECHANICAL DIMENSIONS INCHES (mm) 24-Pin DDIP Versions 24 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 13 ADS-916MC ADS-916MM ADS-926MC ADS-926MM ADS-926/883 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) 24-Pin Surface Mount Versions ADS-916GC ADS-916GM ADS-926GC ADS-926GM 1.31 MAX. (33.02) 24 13 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) Lead Material: Kovar alloy Lead Finish: 50 microinches (minimum) gold plating over 100 microinches (nominal) nickel plating 1 12 0.190 MAX. (4.826) 0.020 TYP. (0.508) PIN 1 INDEX 0.060 TYP. (1.524) 0.130 TYP. (3.302) 0.015 (0.381) MAX. radius for any pin 0.100 (2.540) 0.100 TYP. (2.540) 0.040 (1.016) 0.020 (0.508) 0.010 TYP. (0.254) ORDERING INFORMATION MODEL NUMBER ADS-916MC ADS-916MM ADS-916GC ADS-916GM ADS-926MC ADS-926MM ADS-926GC ADS-926GM ADS-926/883 OPERATING TEMP. RANGE 0 to +70°C –55 to +125°C 0 to +70°C –55 to +125°C 0 to +70°C –55 to +125°C 0 to +70°C –55 to +125°C –55 to +125°C ANALOG INPUT Unipolar (0 to +10V) Unipolar (0 to +10V) Unipolar (0 to +10V) Unipolar (0 to +10V) Bipolar (±5V)* Bipolar (±5V)* Bipolar (±5V)* Bipolar (±5V)* Bipolar (±5V)* ACCESSORIES ADS-B916/917 HS-24 Evaluation Board (without ADS-916) Heat Sinks for all ADS-916/926 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 specifications, contact DATEL. * For information, see ADS-926 data sheet. ® ® ISO 9001 R E G I S T E R E D DS-0300A 11/96 DATEL, Inc. 11 Cabot Boulevard, Mansfield, MA 02048-1151 Tel: (508) 339-3000 (800) 233-2765 Fax: (508) 339-6356 Email: datellit@mcimail.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: 01-34-60-01-01 DATEL GmbH Munchen, 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. 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