Front Ends. TC500A Datasheet

TC500A Ends. Datasheet pdf. Equivalent


Part TC500A
Description Precision Analog Front Ends
Feature TC500/A/510/514 Precision Analog Front Ends with Dual Slope ADC Features: • Precision (up to 17 bit.
Manufacture Microchip
Datasheet
Download TC500A Datasheet


( DataSheet : www.DataSheet4U.com ) PRECISION ANALOG FRONT TC500A Datasheet
TC500/A/510/514 Precision Analog Front Ends with Dual Slope TC500A Datasheet
Recommendation Recommendation Datasheet TC500A Datasheet




TC500A
TC500/A/510/514
Precision Analog Front Ends with Dual Slope ADC
Features:
• Precision (up to 17 bits) A/D Converter “Front
End”
• 3-Pin Control Interface to Microprocessor
• Flexible: User Can Trade-off Conversion Speed
for Resolution
• Single-Supply Operation (TC510/TC514)
• 4 Input, Differential Analog MUX (TC514)
• Automatic Input Voltage Polarity Detection
• Low Power Dissipation:
- (TC500/TC500A): 10 mW
- (TC510/TC514): 18 mW
• Wide Analog Input Range:
- ±4.2V (TC500A/TC510)
• Directly Accepts Bipolar and Differential
Input Signals
Applications:
• Precision Analog Signal Processor
• Precision Sensor Interface
• High Accuracy DC Measurements
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-
integrate 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.
© 2008 Microchip Technology Inc.
DS21428E-page 1



TC500A
TC500/A/510/514
Package Types
16-Pin PDIP/SOIC/CERDIP
CINT
VSS
CAZ
1
2
3
BUF 4
ACOM 5
CREF
CREF+
VREF
6
7
8
16 VDD
15 DGND
14 CMPTR OUT
TC500/ 13 B
TC500A 12 A
11 VIN+
10 VIN
9 VREF+
24-Pin PDIP/SOIC
VOUT
CINT
CAZ
1
2
3
BUF 4
ACOM 5
CREF
CREF+
VREF
6
7
8
VREF+ 9
N/C 10
N/C 11
N/C 12
TC510
24 CAP–
23 DGND
22 CAP+
21 VDD
20 OSC
19 CMPTR OUT
18 A
17 B
16 VIN+
15 VIN
14 N/C
13 N/C
28-Pin PDIP/SOIC
VOUT
CINT
CAZ
BUF
1
2
3
4
ACOM 5
CREF
CREF+
VREF
VREF+
CH4–
6
7
8
9
10
CH3– 11
CH2– 12
CH1– 13
N/C 14
TC514
28 CAP–
27 DGND
26 CAP+
25 VDD
24 OSC
23 CMPTR OUT
22 A
21 B
20 A0
19 A1
18 CH1+
17 CH2+
16 CH3+
15 CH4+
Typical Application
CH1+
CH2+
CH3+
CH4+
CH1-
CH2-
CH3-
CH4-
ACOM
VSS
OSC
A0 A1
DIF.
MUX
(TC514)
CREF
VREF+
CREF+
VREF-
CREF-
RINT
CINT
CAZ
BUF CAZ
CINT
A
0
0
1
1
Control Logic
B Converter Sate
0 Zero Integrator Output
1 Auto-Zero
0 Signal Integrate
1 De-integrate
SWI
SWR SWR
SWRI- SWRI-
Buffer
-
+
Integrator
+
TC500
TC500A
CMPTR 1
TC510
+ CMPTR 2 TC514
Level
+ Shift
CMPTR
Output
SWZ SWRI+ SWRI-
SWIZ SWZ
Polarity
Detection
SWI
SW1
DC-TO-DC
Converter
(TC510 & TC514)
Analog
Switch
Control
Signals
VOUT- CAP- CAP+
Phase
Decoding
Logic
DGND
1.0 μF
COUT-
1.0 μF
VSS
(TC500
TC500A)
AB
Control Logic
DS21428E-page 2
© 2008 Microchip Technology Inc.





@ 2014 :: Datasheetspdf.com :: Semiconductors datasheet search & download site (Privacy Policy & Contact)