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DDC RDC-19220 Series Manual

16-bit monolithic tracking resolver (lvdt)-to-digital converters
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RDC-19220 SERIES
16-BIT MONOLITHIC TRACKING RESOLVER
(LVDT)-TO-DIGITAL CONVERTERS
DESCRIPTION
The RDC-19220 Series of converters are low-cost, versatile, 16-bit
monolithic, state-of-the-art Resolver(/LVDT)-to-Digital Converters.
These single-chip converters are available in small 40-pin DDIP, or
44-pin J-Lead packages and offer programmable features such as
resolution, bandwidth and velocity output scaling.
Resolution programming allows selection of 10-, 12-, 14-, or 16-bit,
with accuracies to 2.3 min. This feature combines the high tracking
rate of a 10-bit converter with the precision and low-speed velocity
resolution of a 16-bit converter in one package.
The velocity output (VEL) from the RDC-19220 Series, which can be
used to replace a tachometer, is a 4 V signal (3.5 V with the +5 V only
option) referenced to ground with a linearity of 0.75% of output voltage.
The full scale value of VEL is set by the user with a single resistor.
RDC-19220 Series converters are available with operating tempera-
ture ranges of 0° to +70°C, -40° to +85°C and -55° to +125°C. Military
processing is available (consult factory).
APPLICATIONS
With its low cost, small size, high accuracy and versatile performance,
the RDC-19220 Series converter is ideal for use in modern high-per-
formance industrial and military control systems. Typical applications
include motor control, radar antenna positioning, machine tool con-
trol, robotics, and process control. MIL-PRF-38534 processing is
available for military applications.
Data Device Corporation
105 Wilbur Place
Bohemia, New York 11716
631-567-5600 Fax: 631-567-7358
www.ddc-web.com
Make sure the next
Card you purchase
has...
FEATURES
•
+5 Volt Only Option
•
Only Five External Passive
Components
•
Programmable:
- Resolution: 10-, 12-, 14-, or 16-Bit
- Bandwidth: to 1200 Hz
- Tracking: to 2300 RPS
•
Differential Resolver and LVDT
Input Modes
•
Velocity Output Eliminates
Tachometer
•
Built-In-Test (BIT) Output
•
Small Size: 40-Pin DDIP or
44-Pin J-Lead Package
•
-55° to +125°C Operating
Temperature Available
•
Programmable for LVDT input
FOR MORE INFORMATION CONTACT:
Technical Support:
1-800-DDC-5757 ext. 7771
©
1999 Data Device Corporation
®

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  • Page 1 10-bit converter with the precision and low-speed velocity resolution of a 16-bit converter in one package. The velocity output (VEL) from the RDC-19220 Series, which can be used to replace a tachometer, is a 4 V signal (3.5 V with the +5 V only option) referenced to ground with a linearity of 0.75% of output voltage.
  • Page 2 Data Device Corporation RDC-19220 SERIES www.ddc-web.com Q-05/05-0...
  • Page 3 Logic 1; 10 TTL loads, = 0.4 mA at 2.8 V min Logic 0; 100 mV max driving CMOS Logic 1; +5 V supply minus 100mV min driving CMOS, High Z; 10 uA//5 pF max Data Device Corporation RDC-19220 SERIES www.ddc-web.com P-05/05-0...

  • Page 4: Theory Of Operation

    THEORY OF OPERATION 0.0055 0.33 The RDC-19220 Series of converters are single CMOS custom Note: EM enables the MSBs and EL enables the LSBs. monolithic chips. They are implemented using the latest IC tech- nology which merges precision analog circuitry with digital logic...
  • Page 5 19230 series converter applications manual (Document number MN-19220XX-001) loop and another lag at higher frequency is introduced to reduce which is available for download from the DDC web site @ www.ddc-web.com. the gain and ripple at the carrier frequency and above. The set-...
  • Page 6 1,333,333 Hz). An understanding of their interaction is essential to extending performance. Note: DDC has software available to perform the previous calcu- lations. Contact DDC to request software or visit our web- The General Setup Considerations section makes note of the site at www.ddc-web.com to download software.
  • Page 7 +SIN SYNCHRO RESOLVER RESOLVER RESOLVER INPUT INPUT OUTPUT OUTPUT -COS -COS +COS +COS FIGURE 5A. TRANSFORMER LAYOUT AND FIGURE 5B. TRANSFORMER LAYOUT AND SCHEMATIC (RESOLVER INPUT - 52036/52037/52038) SCHEMATIC (SYNCHRO INPUT - 52034/52035) Data Device Corporation RDC-19220 SERIES www.ddc-web.com P-05/05-0...
  • Page 8 FIGURE 5D. 60 HZ SYNCHRO AND REFERENCE FIGURE 5C. TRANSFORMER LAYOUT AND TRANSFORMER DIAGRAMS SCHEMATIC (REFERENCE INPUT - B-426) (SYNCHRO INPUT - 52039 / REFERENCE INPUT - 24133) RB CBW CBW/10 FIGURE 6. TYPICAL TRANSFORMER CONNECTIONS Data Device Corporation RDC-19220 SERIES www.ddc-web.com Q-05/05-0...

  • Page 9: Typical Input Connections

    2) External reference LO is grounded, then R3 and R4 are not needed, and -R is connected to GND. 3) See thin film network DDC-55688-1. FIGURE 7A. TYPICAL CONNECTIONS, 2 V RESOLVER, DIRECT INPUT Note: The five external BW components as shown in FIGURE 1 and 2 are necessary for the R/D to function.
  • Page 10 CONVERTER S1 and S3, S2 and S4, and RH and RL should be ideally twisted shielded, with the shield tied to GND at the converter.For DDC-49530 or DDC-57470: Ri = 70.8 kW, 11.8 V input, synchro or resolver. For DDC-49590: Ri = 270 kW, 90 V input, synchro or resolver. Maximum addition error is 1 minute using recommended thin film package.
  • Page 11 S1, S2, and S3 should be triple twisted shielded; RH and RL should be twisted shielded, In both cases the shield should be tied to GND at the converter. 90 V input = DDC-49590: Ri = 270 kΩ, 90 V input, synchro or resolver. 11.8 V input = DDC-49530 or DDC-57470: Ri = 70.8 kΩ, 11.8 V input, synchro or resolver. Maximum addition error is 1 minute.

  • Page 12: Transformer Isolation

    ϕ = -5 V 0.8 R -VCO Where ϕ = desired phase-shift 0.4 R (SCALING) 2π fc Where f = carrier frequency Where c = capacitance FIGURE 10. VELOCITY TRIMMING FIGURE 11. PHASE-SHIFT COMPENSATION Data Device Corporation RDC-19220 SERIES www.ddc-web.com Q-05/05-0...
  • Page 13 2 WIRE LVDT REF IN FS = 2 V +REF , set for phase lag = phase lead through the LVDT. -REF FIGURE 12A. 2-WIRE LVDT DIRECT INPUT Data Device Corporation RDC-19220 SERIES www.ddc-web.com P-05/05-0...
  • Page 14 6. Negative voltages are 180˚ phase from the reference RDC-19220 LVDT Anull Bnull INPUT OUTPUT (V - V ) max. SIN=-1V+ (V - V ) NULL NULL COS=-1V - (V - V ) FIGURE 12C. 3-WIRE LVDT SCALING CIRCUIT Data Device Corporation RDC-19220 SERIES www.ddc-web.com Q-05/05-0...
  • Page 15 RDC-19220 Series specifications for velocity scaling, reversal inputs. The magnitude of this error is given in the following formula: error and offset are contained in TABLE 1.

  • Page 16: Built-In-Test (Bit)

    LVDT MODE Therefore, there is no need to monitor the CB line when As shown in TABLE 1 the RDC-19220 Series units can be made applying an inhibit signal to the converter. to operate as LVDT-to-digital converters by connecting BUILT-IN-TEST (BIT) Resolution Control inputs A and B to “0,”...
  • Page 17 74AC86 LSB +1 74AC86 220 pF 74AC86 CB/NRP 120 pF 1N4148 -5 V NOTE: CMOS LOGIC IS RECOMMENDED. TTL AND TTL COMPATIBLE LOGIC WILL SKEW THE DELAYS. FIGURE 16B. FILTERED/BUFFERED ENCODER EMULATOR CIRCUIT Data Device Corporation RDC-19220 SERIES www.ddc-web.com P-05/05-0...
  • Page 18 PINOUT FUNCTION TABLES BY MODEL NUMBER Since the 40-pin DDIP RDC-19220 does not have a pinout for The TABLES 8 and 9 detail pinout functions by the DDC model the -5 V inverter, it may be necessary to create a -5 V from other number.
  • Page 19 (1.27 ±0.51) 0.012 ±0.004 TYP (0.31 ±0.10) DIMENSIONS SHOWN ARE IN INCHES (MM). +0.050 0.095 ±0.010 0.600 - 0.020 (2.41 ±0.25) +1.27 (15.25 - 0.51 FIGURE 18. RDC-19220 (40-PIN DDIP) CERAMIC PACKAGE MECHANICAL OUTLINE Data Device Corporation RDC-19220 SERIES www.ddc-web.com P-05/05-0...
  • Page 20 PIN NUMBERS FOR REF ONLY 0.075 ±0.010 0.650 SQ ±0.010 (1.91 ±0.25) (16.51 ±0.25) DIMENSIONS SHOWN ARE IN INCHES (MM) 0.690 ±0.010 TYP (17.53 ±0.25) FIGURE 20. RDC-19222 (44-PIN CERAMIC J-LEAD) MECHANICAL OUTLINE Data Device Corporation RDC-19220 SERIES www.ddc-web.com Q-05/05-0...

  • Page 21: Ordering Information

    4 = MIL-PRF-38534 Compliant, with Solder Dip 5 = MIL-PRF-38534 Compliant, with PIND testing, and Solder Dip 6 = Standard DDC Processing, with PIND testing, and Burn-In 7 = Standard DDC Processing, with Solder Dip, and Burn-In 9 = Standard DDC Processing, with Solder Dip, without Burn-In Temperature Grade / Data Requirements: 1 = -55 to +125°C...
  • Page 22 Description DDC converters such as the RDC-19220/2S and RD-19230 require closely matched 2Vrms Sin/Cos input voltages to minimize digital error. DDC has custom thin film resistor networks that provide the correctly matched 2Vrms converter outputs for 11.8Vrms Resolver/Synchro or 90Vrms synchro applications.
  • Page 23 Specifications are subject to change without notice. Please visit our web site at www.ddc-web.com for the latest information. 105 Wilbur Place, Bohemia, New York, U.S.A. 11716-2482 For Technical Support - 1-800-DDC-5757 ext. 7771 Headquarters, N.Y., U.S.A.

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