CDB5012 CIRRUS | Alldatasheet
Document overview
- Manufacturer or author: Provided By ALLDATASHEET.COM(FREE DATASHEET DOWNLOAD SITE)
- PDF pages: 7
Technical content
Features
- •Compatible with CS5012, CS5012A, CS5014, CS5016
- •PC/µP-Compatible Header Connection 16-Bit Parallel Data End-of-Conversion Output CS, RD, and A0 Control Inputs
- •DIP-Switch Selectable: Unipolar/Bipolar Input Range Burst & Interleave Calibration Modes Continuous Conversion
- •Adjustable Voltage Reference
- •Serial Data and Clock BNC Connections
- •Operation from Internally-Generated or Externally-Supplied Master Clock General Description The CDB5012/4/6 is an evaluation board that eases the laboratory characterization of any of the CS5012, CS5012A, CS5014 and CS5016 A/D converters. The board can be easily reconfigured to simulate any com- bination of sampling, master clock, calibration, and input range conditions. The converter’s parallel output data are available at a 40 pin strip header allowing easy interfacing to PC’s or microprocessor busses. Output data is also available in serial form at SCLK and SDATA coaxial BNC connec- tors. Evaluation can also be performed over a wide range of input spans using the on-board reference circuitry. Fur- thermore, the CDB5012, CDB5012A, CDB5014, CDB5016 features DIP-switch selectable unipolar/bipo- lar input ranges and the interleave calibration mode. Calibration can be initiated at any time by momentarily depressing a reset pushbutton. ORDERING INFORMATION: CDB5012, CDB5012A, CDB5014, CDB5016 MAR ’95 DS14DB11 Crystal Semiconductor Corporation P.O. Box 17847, Austin, TX 78760 (512) 445 7222 FAX: (512) 445 7581 Evaluation Board for CS5012, CS5012A, CS5014, CS5016 ADC’s Semiconductor Corporation CDB5012 CDB5012A CDB5014 CDB5016 D0 - D15 RD EOC CS H E A D E R SCLK SDATA RESET AIN CLKIN HOLD GND -5V+5V VOLTAGE REFERENCE A/D Converter CS5012A CS5014 CS5016 CS5012 Copyright Crystal Sem iconductor Corporation 1995 (All Rights Reserved)
through the BNC coaxial connector labeled AIN. defining both zero- and full-scale (±VREF).
31 TST
29 REFBUF
37 EOT
Figure 1. CDB5012, CDB5012A, CDB5014, CDB5016 Schematic
this input can be generated by one of two means. tion" in the converter’s data sheet). input has been acquired to the specified accuracy. can be found in the converter’s data sheet. come within 300mV of the positive supply. grounded lead of decoupling capacitor C9.
- NOTE: Use of BURST CAL is not recommended.
Figure 2. DIP-Switch Definitions
1403 R21 R22
Figure 3. Voltage Reference Circuitry
3 D S14DB11
is ready for normal operation. register, appears at the header. tained on D0-D7 by driving A0 low. Figure 4. Header Pin Definitions
terminated by a 51 Ω resistor to eliminate line reflections of the incoming clock. If the CLKIN BNC input is left floating, this resistor pulls the converter’s clock input down to ground, thus ac- tivating its internal oscillator. Decoupling The CDB5012, CDB5012A, CDB5014, CDB5016’s decoupling scheme was designed to insure accurate evaluation of the converter’s per- formance independent of the quality of the power supplies. Each supply is decoupled at the con- verter with a 10 µF electrolytic capacitor to filter low frequency noise and a 0.1µF ceramic capaci- tor to handle higher frequencies. The auto-zero- ing action of the converter’s comparator provides extremely good power supply rejection at low frequencies. Depending on the quality of the sys- tem’s power supplies, the decoupling scheme could be relaxed in actual use. COMPONENT LIST 10 Ω resistor R1, R2 51 Ω resistor R3 4.7 Ω resistor R18 1 kΩ resistor R9, R14 560 Ω resistor R17 10 kΩ resistor R4, R5, R6, R7, R8, R10, R11, R12, R13 2.43 kΩ resistor R19, R20 3.3 kΩ resistor R16 240 kΩ resistor R21 50 kΩ potentiometer R15 50 kΩ potentiometer R22 0.068 µF capacitor C14 0.1 µF capacitor C1, C3, C5, C7, C9, C10, C12 10 µF capacitor C2, C4, C6, C8, C11, C13 CS501X/511X A/D converter U1 1403 2.5V reference U2 OP07 op amp U3 2N2907A transistor Q1 4 pos. SPST DIP switch SW1 N.O. SPST push-button SW2 20 pin header CON1 bulkhead BNC CON2, CON3, CON4, CON5, CON6 red banana jack CON7 black banana jack CON8 green banana jack CON9 1" 4-40 spacer POST1, POST2, POST3, POST4, POST5, POST6 3/8" 4-40 screw SC1, SC2, SC3, SC4, SC5, SC6 CDB5012, CDB5012A, CDB5014, CDB5016
5 D S14DB11
10 R1 R2
Figure 5. Board Layout
Smart AnalogTM is a Trademark of Crystal Semiconductor Corporation