Document
VECANA01
VECA NA01
www.ti.com
10-Channel, 12-Bit DATA ACQUISITION SYSTEM
FEATURES
q 10 FULLY DIFFERENTIAL INPUTS q 5 SIMULTANEOUS SAMPLED CHANNELS PLUS 2 SYNCHRONIZED SAMPLING CHANNELS q 3 SYNCHRONIZED 12-BIT ADCs q 12.8µs THROUGHPUT RATE q DIGITALLY SELECTABLE INPUT RANGES q ±5V POWER SUPPLIES q SERIAL DIGITAL INPUT/OUTPUTS q 7 SIGN AND 3 DIGITALLY PROGRAMMABLE WINDOW COMPARATOR
IUP/N 2 A1P/N 2 A2P/N 2 IVP/N 2 B1P/N 2 B2P/N MUX2 2 IWP/N 2 AN1P/N AN2P/N AN3P/N 2 2 MUX3 Input Select Gain Select ADIN SH3 PGA3 ADC3 12-Bit ADOUT3 SH2 PGA2 ADC2 12-Bit ADOUT2 MUX1 SH1 PGA1 ADC1 12-Bit ADOUT1 2
APPLICATIONS
q q q q AC MOTOR SPEED CONTROLS THREE PHASE POWER CONTROL UNINTERRUPTABLE POWER SUPPLIES VIBRATION ANALYSIS
DESCRIPTION
The VECANA01 consists of three 12-bit analog-todigital converters preceded by five simultaneously operating sample-hold amplifiers, and multiplexers for 10 differential inputs. The ADCs have simultaneous serial outputs for high speed data transfer and data processing. The VECANA01 also offers a programmable gain amplifier with programmable gains of 1.0V/V, 1.25V/V, 2.5V/V, and 5.0V/V. Channel selection and gain selection are selectable through the serial input control word. The high through put rate is maintained by simultaneously clocking in the 13-bit input control word for the next conversion while the present conversions are clocked out. The part also contains an 8-bit digital-to-analog converter whose digital input is supplied as part of the input control word.
2.5V Ref
Control Logic
Input Setup Register
DAC REFOUT
DAC 8-Bit
DAOUT ADCLK ADCONV ADBUSY
7 7
COMP
3
ILIM
DAIN
Copyright © 2000, Texas Instruments Incorporated
SBAS155
Printed in U.S.A. October, 2000
SPECIFICATIONS
At VANA+ = +5V, VANA– = –5V, VDIG+ = +5V, VDIG– = –5V, and TA = –40°C to +85°C, using internal reference, fCLOCK = 1.25MHz.
ANALOG-TO-DIGITAL CONVERTER CHANNELS
VECANA01N PARAMETER RESOLUTION ANALOG INPUT Full Scale Voltage, Differential CONDITIONS MIN 12 ±2.5 ±2.0 ±1.0 ±0.5 See Table VII 1012 20 10.4 12.8 78 0.1 0.5 50 50 3 ±0.5 ±0.5 12 0.5 0.5 G = 1.0V/V G G G G G = = = = = 1.0V/V 2.5V/V 1.0V/V 1.0V/V 1.0V/V ±10 ±10 ±0.5 ±0.5 ±0.5 ±3 ±3 2 4 ±100 ±100 ±15 ±20 ±2 ±2 TYP MAX UNITS Bit
G = 1.0V/V G = 1.25V/V G = 2.5V/V G = 5.0V/V ±0.5
Common-Mode Voltage Impedance Capacitance THROUGHPUT SPEED Conversion Time Complete Cycle Throughput Rate SAMPLING DYNAMICS S/H Droop Rate S/H Acquisition Time S/H Aperture Delay S/H Aperture Jitter Sampling Skew, Channel-to-Channel DC ACCURACY Integral Linearity - ADC Differential Linearity - ADC No Missing Codes Integral Linearity - Asynchronous, Synchronous Differential Linearity - Asynchronous, Synchronous Full Scale Error Full Scale Error Other Gains Full Scale Error Drift Zero Error - ADC Zero Error - Asynchronous, Synchronous Zero Error Drift AC ACCURACY Total Harmonic Distortion fIN = 1kHz fIN = 1MHz CMR REFERENCE Internal Reference Voltage Internal Reference Accuracy Internal Reference Drift Internal Reference Source Current External Reference Voltage Range for Specified Linearity External Reference Current Drain DIGITAL INPUTS Logic Levels VIL VIH IIL IIH Input Capacitance DIGITAL OUTPUTS Data Format Data Coding VOL VOH Leakage Current Output Capacitance CLK = 1.25MHz Acquire and Convert
V V V V V Ω pF µs µs kHz µV/µs µs ns ps ns LSB LSB Bits LSB LSB % of FSR % of FSR ppm/°C ppm/°C LSB LSB ppm/°C
VCM = ±0.5V, fCM = 1MHz
92 70 50 2.5 ±0.25 ±10 10 2.5 10
dB dB dB V % ppm/°C µA V µA
±2
2.25
2.75
0 +3.5
At All Digital Input Pins 12-Bit Serial BTC ISINK = 1.6mA ISOURCE = 500µA At All Digital Output Pins 0 4.2
1.5 +5 ±10 ±10 15
V V µA µA pF
0.4 5 ±5 15
V V µA pF
2
VECANA01
SBAS155
SPECIFICATIONS
(Cont.)
At VANA+ = +5V, VANA– = –5V, VDIG+ = +5V, VDIG– = –5V, and TA = –40°C to +85°C, using internal reference, fCLOCK = 1.25MHz.
ANALOG-TO-DIGITAL CONVERTER CHANNELS
VECANA01N PARAMETER POWER SUPPLIES VANA+ VANA– VDIG+ VDIG– IANA+ IANA– IDIG+ IDIG– Power Dissipation TEMPERATURE RANGE Specified Performance Derated Performance Storage CONDITIONS Specified Performance +4.75 –4.75 +4.75 –4.75 +5.0 –5.0 +5.0 –5.0 15 –8 12 –10 225 +5.25 –5.25 +5.25 –5.25 V V V V mA mA mA mA mW °C °C °C MIN TYP MAX UNITS
–40 –55 –65
+85 +125 +150
DIGITAL-TO-ANALOG CONVERTER
VECANA01N PARAMETER RESOLUTION Output Range Output Settling Time Linearity Error Differential Linearity Output Current Offset Error Full Scale Error (including REF) CONDITIONS MIN 8-Bits 0 0.5LSB 0.2 TYP MAX +2.5 1 ±1 ±1 ±10 ±2 UNITS V µs LSB LSB µA mV %
200 ±1
SIGN AND WINDOW COMPARATORS
VECANA01 PARAMETER Differential Input Voltage Range of the Window Comparators Offset Error of the Window Comparators Hysteresis of the Window Comparators Offset Error of the Sign Current Comparators Hysteresis of the Sign Current Comparators Offset Error of the Sign Sensor Signal Comparators Hysteresis of the Sign Sensor Signal Comparators Absolute Input Range of the Comparators Delay Time of the Sign Comparators Dela.