TC500 Microchip Technology, TC500 Datasheet

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TC500

Manufacturer Part Number
TC500
Description
(TC500 - TC514) Precision Analog Front Ends
Manufacturer
Microchip Technology
Datasheet

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Features
• Precision (up to 17 bits) A/D Converter “Front
• 3-Pin Control Interface to Microprocessor
• Flexible: User Can Trade-off Conversion Speed
• Single-Supply Operation (TC510/TC514)
• 4 Input, Differential Analog MUX (TC514)
• Automatic Input Voltage Polarity Detection
• Low Power Dissipation:
• Wide Analog Input Range:
• Directly Accepts Bipolar and Differential
Applications
• Precision Analog Signal Processor
• Precision Sensor Interface
• High Accuracy DC Measurements
 2004 Microchip Technology Inc.
End”
for Resolution
- (TC500/TC500A): 10 mW
- (TC510/TC514): 18 mW
- ±4.2V (TC500A/TC510)
Input Signals
Precision Analog Front Ends
TC500/A/510/514
General Description
TheTC500/A/510/514 family are precision analog front
ends that implement dual slope A/D converters having
a maximum resolution of 17 bits plus sign. As a
minimum, each device contains the integrator, zero
crossing comparator and processor interface logic. The
TC500 is the base (16-bit max) device and requires
both positive and negative power supplies. The
TC500A is identical to the TC500 with the exception
that it has improved linearity, allowing it to operate to a
maximum resolution of 17 bits. The TC510 adds an on-
board negative power supply converter for single-
supply operation. The TC514 adds both a negative
power supply converter and a 4-input differential
analog multiplexer.
Each device has the same processor control interface
consisting of 3 wires: control inputs (A and B) and zero-
crossing comparator output (CMPTR). The processor
manipulates A, B to sequence the TC5XX through four
phases of conversion: auto-zero, integrate, de-inte-
grate and integrator zero. During the auto-zero phase,
offset voltages in the TC5XX are corrected by a closed
loop feedback mechanism. The input voltage is applied
to the integrator during the integrate phase. This
causes an integrator output dv/dt directly proportional
to the magnitude of the input voltage. The higher the
input voltage, the greater the magnitude of the voltage
stored on the integrator during this phase. At the start
of the de-integrate phase, an external voltage
reference is applied to the integrator and, at the same
time, the external host processor starts its on-board
timer. The processor maintains this state until a
transition occurs on the CMPTR output, at which time
the processor halts its timer. The resulting timer count
is the converted analog data. Integrator zero (the final
phase of conversion) removes any residue remaining
in the integrator in preparation for the next conversion.
The TC500/A/510/514 offer high resolution (up to 17
bits), superior 50/60 Hz noise rejection, low-power
operation, minimum I/O connections, low input bias
currents and lower cost compared to other converter
technologies having similar conversion speeds.
DS21428C-page 1

Related parts for TC500

TC500 Summary of contents

Page 1

... As a minimum, each device contains the integrator, zero crossing comparator and processor interface logic. The TC500 is the base (16-bit max) device and requires both positive and negative power supplies. The TC500A is identical to the TC500 with the exception that it has improved linearity, allowing it to operate to a maximum resolution of 17 bits ...

Page 2

... Converter Sate 0 0 Zero Integrator Output 0 1 Auto-Zero 1 0 Signal Integrate 1 1 De-integrate INT TC500 TC500A TC510 CMPTR 1 TC514 CMPTR 2 + Level CMPTR Shift Output + Polarity Detection Phase DGND Decoding Logic (TC500 Control Logic TC500A)  2004 Microchip Technology Inc. ...

Page 3

... Exposure to Absolute Maximum Rating conditions for extended periods may affect device reliability < 5. +5V, TC500/TC500A +25° 0°C to 70° Typ. Max. ...

Page 4

... Negative Supply V -4.5 SS Operating Range Note 1: Integrate time 66 msec, auto-zero time 2: End point linearity at ±1/4, ±1/2, ±3/4 F.S. after full-scale adjustment. 3: Rollover error is related to C INT DS21428C-page 4 = +5V, TC500/TC500A +25° 0°C to 70° Typ. Max. Min. Typ. — V – ...

Page 5

... Load Current (mA) FIGURE 2-2: Output Ripple vs. Load Current. 100 100 Oscillator Capacitance (pF) FIGURE 2-3: Oscillator Frequency vs. Capacitance.  2004 Microchip Technology Inc. TC500/A/510/514 - +25 ° FIGURE 2-4: Current. 100 ...

Page 6

... A0 — — DS21428C-page 6 Function Integrator output. Integrator capacitor connection. Negative power supply input (TC500/TC500A only). Auto-zero input. The auto-zero capacitor connection. Buffer output. The Integrator capacitor connection. input common pin ( within the analog Common Mode Range (CMR Input ...

Page 7

... Integrating converters provide inherent noise rejection with at least a 20dB/decade attenuation rate. Interference signals with frequencies at integral  2004 Microchip Technology Inc. TC500/A/510/514 multiples of the integration period are, theoretically, completely removed, since the average value of a sine wave of frequency (1/T) averaged over a period (T) is zero ...

Page 8

... TC500/A/510/514 Analog Input ( ± Ref Voltage REF V 1 INT DEINT FIGURE 4-3: Basic Dual Slope Converter. DS21428C-page 8 C INT Integrator R INT – V INT – Phase Switch Driver Control Polarity Control V SUPPLY V INT ROM REF RAM TC510 Comparator ...

Page 9

... TC500/A/510/514 CONVERTER OPERATION The TC500/A/510/514 incorporates an auto-zero and Integrator phase in addition to the input signal Integrate and reference De-integrate phases. The addition of these phases reduce system errors, calibration steps and shorten overrange recovery time. A typical measurement cycle uses all four phases in the following order: 1 ...

Page 10

... TC500/A/510/514 T TIME Converter Status Auto-zero Full-scale Input Integrator 0 Voltage V INT Undefined Comparator Output Inputs Begin Conversion with Controller Auto-Zero Phase Operation Typically = T INT (Positive Input Shown) Notes: The length of this phase is chosen almost arbitrarily but needs to be long enough to null out worst case errors (see text) ...

Page 11

... Integrator Output Comparator Output A. Positive Input Signal FIGURE 6-1: Comparator Output.  2004 Microchip Technology Inc. TC500/A/510/514 The difference in reference for (+) or (-) input voltages will cause a rollover error. This error can be minimized by using a large reference capacitor in comparison –) IN the stray capacitance. ...

Page 12

... SMR5 104K50J01L4 0.22 SMR5 224K50J02L4 0.47 SMR5 474K50J04L4 ) DD - 0.9VI 0.9VI – INT -------------------------------------------- - C = INT V – 0 whichever is less (TC500/ INT RECOMMENDED CAPACITOR FOR C INT Suggested Part Number* SMR5 104K50J01L4 SMR5 224K50J02L4 SMR5 334K50J03L4 SMR5 474K50J04L4 REF V – 0 INT INT ---------------------------------------------------------- - INT  ...

Page 13

... The system may remain in this phase indefinitely (i.e., auto-zero is the appropriate Idle state for a TC5XX device).  2004 Microchip Technology Inc. TC500/A/510/514 8.4 Input Signal Integrate Phase The length of this phase is constant from one conversion to the next and depends on system parameters and component value selections ...

Page 14

... TC500/A/510/514 S 30V N TH Low V REF FIGURE 8-1: Noise Threshold. 8.6 Integrator Output Zero Phase The comparator delay and the controller's response latency may result in overshoot, causing charge buildup on the integrator at the end of a conversion. This charge must be removed or performance will degrade. The integrator output zero phase should be activated (AB = 00) until CMPTR goes high ...

Page 15

... From which REF (see Table 7-1) Note: Microchip recommended capacitor: Evox-Rifa p/n: 5MR5 224K50J02L4 Step 5. Calculate V : REF EQUATION 9-1: V – 0 INT ---------------------------------------------------------- - V = REF 2 T INT – 4.1 0. ------------------------------------------------------------- - 2 0.66 = 1.025  2004 Microchip Technology Inc. TC500/A/510/514 ) as a multiple - 0. 0.22 F INT 5 DS21428C-page 15 ...

Page 16

... TC500/A/510/514 1 V OUT C INT 1 µF 0.33 µ INT C AZ 0.22 µ +5V BUF R INT 100 k 5 ACOM 6 MCP1525 C C REF REF R 0.22 µ REF R3 µF V REF REF 0.01 µF FIGURE 9-1: TC510 Design Sample µF INT 0.33 µF ...

Page 17

... PC Printer Port PORT 0378 HEX 10 19 CMPTR FIGURE 9-3: TC510 To IBM  2004 Microchip Technology Inc. TC500/A/510/514 µ OUT CAP- 1 µF 22 CAP REF 0.22 µ REF REF TC510 0.01 µ REF 100 k 4 BUF 0.22 µ ...

Page 18

... TC500/A/510/514 + CH1+ Input 1 13 – CH1– CH2+ Input 2 12 – CH2– 16 CH3+ + Input 3 11 – CH3– 15 CH4+ + Input 4 10 CH4– – Analog Mux Control Logic 19 A1 ® IBM Printer Port Port 21 3 0378 ...

Page 19

... Standard marking consists of Microchip part number, year code, week code, traceability code. For marking beyond this, certain price adders apply. Please check with your Microchip Sales Office.  2004 Microchip Technology Inc. TC500/A/510/514 Example: TC500AIJE 0441256 Example: TC500CPE 0441256 Example: TC500ACOE 0441256 DS21428C-page 19 ...

Page 20

... TC500/A/510/514 Package Marking Information (Continued) 24-Lead PDIP (300 mil) XXXXXXXXXXXXX YYWWNNN 24-Lead SOIC (300 mil) XXXXXXXXXXXXX XXXXXXXXXXXXX YYWWNNN 28-Lead PDIP (300 mil) XXXXXXXXXXXXXX XXXXXXXXXXXXXX YYWWNNN 28-Lead SOIC (300 mil) XXXXXXXXXXXXX XXXXXXXXXXXXX XXXXXXXXXXXXX YYWWNNN DS21428C-page 20 Example: TC510CPF 0441256 Example: TC510COG 0441256 ...

Page 21

... Shoulder to Shoulder Width Ceramic Pkg. Width Overall Length Tip to Seating Plane Lead Thickness Upper Lead Width Lower Lead Width Overall Row Spacing *Controlling Parameter JEDEC Equivalent: MS-030 Drawing No. C04-003  2004 Microchip Technology Inc. TC500/A/510/514 Units INCHES* MIN ...

Page 22

... TC500/A/510/514 16-Lead Plastic Dual In-line (PE) – 300 mil (PDIP Dimension Limits Number of Pins Pitch Top to Seating Plane Molded Package Thickness Base to Seating Plane Shoulder to Shoulder Width Molded Package Width Overall Length Tip to Seating Plane Lead Thickness Upper Lead Width ...

Page 23

... Controlling Parameter § Significant Characteristic Notes: Dimensions D and E1 do not include mold flash or protrusions. Mold flash or protrusions shall not exceed .010” (0.254mm) per side. JEDEC Equivalent: MS-013 Drawing No. C04-102  2004 Microchip Technology Inc. TC500/A/510/514 Units ...

Page 24

... TC500/A/510/514 24-Lead Skinny Plastic Dual In-line (PF) – 300 mil (PDIP Dimension Limits Number of Pins Pitch Top to Seating Plane Molded Package Thickness Base to Seating Plane Shoulder to Shoulder Width Molded Package Width Overall Length Tip to Seating Plane Lead Thickness ...

Page 25

... Mold Draft Angle Bottom *Controlling Parameter per JEDEC MS-103 Revision C. Notes: Dimensions D and E1 do not include mold flash or protrusions. Mold flash or protrusions shall not exceed .010" (0.254mm) per side. JEDEC Equivalent: MS-013 AD Drawing No. C04-025  2004 Microchip Technology Inc. TC500/A/510/514 ...

Page 26

... TC500/A/510/514 28-Lead Skinny Plastic Dual In-line (PJ) – 300 mil (PDIP Dimension Limits Number of Pins Pitch Top to Seating Plane Molded Package Thickness Base to Seating Plane Shoulder to Shoulder Width Molded Package Width Overall Length Tip to Seating Plane Lead Thickness ...

Page 27

... Controlling Parameter § Significant Characteristic Notes: Dimensions D and E1 do not include mold flash or protrusions. Mold flash or protrusions shall not exceed .010” (0.254mm) per side. JEDEC Equivalent: MS-013 Drawing No. C04-052  2004 Microchip Technology Inc. TC500/A/510/514 Units ...

Page 28

... TC500/A/510/514 10.2 Product Tape and Reel Specifications Component Taping Orientation for 16-Pin SOIC (Wide) Devices PIN 1 Carrier Tape, Number of Components Per Reel and Reel Size Package 16-Pin SOIC (W) Component Taping Orientation for 24-Pin SOIC (Wide) Devices PIN 1 Carrier Tape, Number of Components Per Reel and Reel Size ...

Page 29

... Component Taping Orientation for 28-Pin SOIC (Wide) Devices PIN 1 Carrier Tape, Number of Components Per Reel and Reel Size Package 28-Pin SOIC (W)  2004 Microchip Technology Inc. TC500/A/510/514 User Direction of Feed P Standard Reel Component Orientation for TR Suffix Device Carrier Width (W) Pitch (P) ...

Page 30

... TC500/A/510/514 NOTES: DS21428C-page 30  2004 Microchip Technology Inc. ...

Page 31

... To order or obtain information, e.g., on pricing or delivery, refer to the factory or the listed sales office PART NO. X /XX Device Temperature Package Range Device TC500 16 Bit Analog Processor TC500A 16 Bit Analog Processor TC510 Precision Analog Front End TC514 Precision Analog Front End Temperature Range C = 0°C to +70°C (Commercial -25° ...

Page 32

... TC500/A/510/514 NOTES: DS21428C-page 32  2004 Microchip Technology Inc. ...

Page 33

... ICEPIC, Migratable Memory, MPASM, MPLIB, MPLINK, MPSIM, PICkit, PICDEM, PICDEM.net, PICtail, PowerCal, PowerInfo, PowerMate, PowerTool, rfLAB, Select Mode, SmartSensor, SmartTel and Total Endurance are trademarks of Microchip Technology Incorporated in the U.S.A. and other countries. SQTP is a service mark of Microchip Technology Incorporated in the U.S.A. All other trademarks mentioned herein are property of their respective companies. © ...

Page 34

... Italy Via Quasimodo, 12 20025 Legnano (MI) Milan, Italy Tel: 39-0331-742611 Fax: 39-0331-466781 Netherlands Waegenburghtplein 4 NL-5152 JR, Drunen, Netherlands Tel: 31-416-690399 Fax: 31-416-690340 United Kingdom 505 Eskdale Road Winnersh Triangle Wokingham Berkshire, England RG41 5TU Tel: 44-118-921-5869 Fax: 44-118-921-5820 05/28/04  2004 Microchip Technology Inc. ...

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