TC500
TC500A
TC510
1
2
3
4
5
6
7
8
EVALUATION
KIT
AVAILABLE
TC514
PRECISION ANALOG FRONT ENDS
FEATURES
GENERAL DESCRIPTION
■ 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 (TC510/514)
■ 4 Input, Differential Analog MUX (TC514)
■ Automatic Input Voltage Polarity Detection
■ Low Power Dissipation ........... TC500/500A: 10mW
TC510/514: 18mW
The TC500/500A/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,
eachdevicecontainstheintegrator, zerocrossingcompara-
tor 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,
except 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 ma-
nipulates A, B to sequence the TC5xx through four phases
of conversion: Auto Zero, Integrate, Deintegrate and Inte-
grator Zero. During the Auto Zero phase, offset voltages in
the TC5xx are corrected by a closed-loop feedback mecha-
nism. Theinputvoltageisappliedtotheintegratorduringthe
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
thevoltagestoredontheintegratorduringthis phase. Atthe
startoftheDeintegratephase,anexternalvoltagereference
isappliedtotheintegrator,andatthesametime,theexternal
hostprocessorstartsitson-boardtimer. Theprocessormain-
■ Wide Analog Input Range .......±4.2V (TC500A/510)
■ Directly Accepts Bipolar and Differential Input
Signals
ORDERING INFORMATION
Part No.
Package
Temp. Range
TC500ACOE
16-Pin SOIC
0°C to +70°C
0°C to +70°C
0°C to +70°C
0°C to +70°C
0°C to +70°C
0°C to +70°C
0°C to +70°C
0°C to +70°C
T
C500ACPE
16-Pin Plastic DIP (Narrow)
16-Pin SOIC
TC500COE
TC500CPE
TC510COG
TC510CPF
TC514COI
TC514CPJ
TC500EV
16-Pin Plastic DIP (Narrow)
24-Pin SOIC
24-Pin Plastic DIP (300 Mil.)
28-Pin SOIC
28-Pin Plastic DIP (300 Mil.)
Evaluation Kit for TC500/500A/510/514
FUNCTIONAL BLOCK DIAGRAM
CONTROL LOGIC
C
R
INT
INT
A
0
0
1
1
B
0
1
0
1
CONVERTER STATE
ZERO INTEGRATOR OUTPUT
AUTO-ZERO
C
REF
C
+
REF
–
AZ
BUF
SIGNAL INTEGRATE
DEINTEGRATE
V
V
A1
A0
REF
–
+
C
C
C
REF
C
INT
AZ
REF
BUFFER
–
SW SW
R
R
+
+
+
+
–
–
–
–
INTEGRATOR
CH1
CH2
CH3
CH4
CH1
CH2
CH3
CH4
TC500
TC500A
TC510
TC514
SW
CMPTR 1
+
I
–
+
DIF.
MUX
(TC514)
CMPTR 2
–
+
–
+
SW
SW
RI
RI
LEVEL
SHIFT
CMPTR
OUTPUT
–
+
SW
SW
Z
IZ
SW
Z
+
–
SW
SW
POLARITY
DETECTION
RI
RI
ACOM
SW
1
SW
ANALOG
I
PHASE
DECODING
LOGIC
SWITCH
CONTROL
SIGNALS
DGND
V
S
DC-TO-DC
CONVERTER
(TC510 & TC514)
OSC
–
V
+
–
CAP
OUT
CAP
V
A
B
1.0µF
SS
–
(TC500
TC500A)
CONTROL LOGIC
C
1.0µF
OUT
TC500/A/510/514-3 10/3/96
TELCOM SEMICONDUCTOR, INC.
3-19