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PDF TC7106 Data sheet ( Hoja de datos )
| Número de pieza | TC7106 | |
| Descripción | 3-1/2 Digit Analog-to-Digital Converters | |
| Fabricantes | Microchip | |
| Logotipo |  |
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TC7106/A/TC7107/A
3-1/2 Digit Analog-to-Digital Converters
Features:
• Internal Reference with Low Temperature Drift:
- TC7106/7: 80ppm/°C Typical
- TC7106A/7A: 20ppm/°C Typical
• Drives LCD (TC7106) or LED (TC7107)
Display Directly
• Zero Reading with Zero Input
• Low Noise for Stable Display
• Auto-Zero Cycle Eliminates Need for Zero
Adjustment
• True Polarity Indication for Precision Null
Applications
• Convenient 9V Battery Operation (TC7106A)
• High-Impedance CMOS Differential Inputs: 1012Ω
• Differential Reference Inputs Simplify Ratiometric
Measurements
• Low-Power Operation: 10mW
Applications:
• Thermometry
• Bridge Readouts: Strain Gauges, Load Cells, Null
Detectors
• Digital Meters: Voltage/Current/Ohms/Power, pH
• Digital Scales, Process Monitors
• Portable Instrumentation
Device Selection Table
Package
Code
Package
Pin Layout
Temperature
Range
CPI
IPL
IJL
CKW
40-Pin PDIP
40-Pin PDIP
40-Pin CERDIP
44-Pin PQFP
CLW 44-Pin PLCC
Normal
Normal
Normal
Formed
Leads
—
0°C to +70°C
-25°C to +85°C
-25°C to +85°C
0°C to +70°C
0°C to +70°C
General Description:
The TC7106A and TC7107A 3-1/2 digit direct display
drive Analog-to-Digital Converters allow existing 7106/
7107 based systems to be upgraded. Each device has
a precision reference with a 20ppm/°C max tempera-
ture coefficient. This represents a 4 to 7 times improve-
ment over similar 3-1/2 digit converters. Existing 7106
and 7107 based systems may be upgraded without
changing external passive component values. The
TC7107A drives common anode light emitting diode
(LED) displays directly with 8mA per segment. A low
cost, high resolution indicating meter requires only a
display, four resistors, and four capacitors.The
TC7106A low-power drain and 9V battery operation
make it suitable for portable applications.
The TC7106A/TC7107A reduces linearity error to less
than 1 count. Rollover error – the difference in readings
for equal magnitude, but opposite polarity input signals,
is below ±1 count. High-impedance differential inputs
offer 1pA leakage current and a 1012Ω input imped-
ance. The differential reference input allows ratiometric
measurements for ohms or bridge transducer
measurements. The 15μVP–P noise performance
ensures a “rock solid” reading. The auto-zero cycle
ensures a zero display reading with a zero volts input.
© 2006 Microchip Technology Inc.
DS21455C-page 1
1 page  
TC7106/A/TC7107/A
TABLE 1-1: TC7106/A AND TC7107/A ELECTRICAL SPECIFICATIONS
Electrical Characteristics: Unless otherwise noted, specifications apply to both the TC7106/A and TC7107/A at TA = 25°C,
fCLOCK = 48kHz. Parts are tested in the circuit of the Typical Operating Circuit.
Symbol
Parameter
Min Typ Max Unit
Test Conditions
ZIR Zero Input Reading
-000.0
±000.0
+000.0 Digital VIN = 0.0V
Reading Full Scale = 200.0mV
Ratiometric Reading
R/O Rollover Error (Difference in Reading for
Equal Positive and Negative
Reading Near Full Scale)
999 999/1000 1000 Digital VIN = VREF
Reading VREF = 100mV
-1
±0.2
+1 Counts VIN- = + VIN+ ≅ 200mV
Linearity (Max. Deviation from Best
Straight Line Fit)
-1
±0.2
+1 Counts Full Scale = 200mV or
Full Scale = 2.000V
CMRR Common Mode Rejection Ratio (Note 3)
—
50
— μV/V VCM = ±1V, VIN = 0V,
Full Scale = 200.0mV
eN
Noise (Peak to Peak Value not Exceeded
—
15
— μV VIN = 0V
95% of Time)
Full Scale - 200.0mV
IL Leakage Current at Input
Zero Reading Drift
— 1 10 pA VIN = 0V
— 0.2 1 μV/°C VIN = 0V
“C” Device = 0°C to +70°C
— 1.0 2 μV/°C VIN = 0V
“I” Device = -25°C to +85°C
TCSF Scale Factor Temperature Coefficient
—1
5 ppm/°C VIN = 199.0mV,
“C” Device = 0°C to +70°C
(Ext. Ref = 0ppm°C)
— — 20 ppm/°C VIN = 199.0mV
“I” Device = -25°C to +85°C
IDD Supply Current (Does not include LED
Current For TC7107/A)
— 0.8 1.8 mA VIN = 0.8
VC Analog Common Voltage
(with Respect to Positive Supply)
2.7 3.05 3.35 V 25kΩ Between Common and
Positive Supply
VCTC Temperature Coefficient of Analog
— — — — 25kΩ Between Common and
Common (with Respect to Positive Supply)
Positive Supply
7106/7/A
7106/7
20
80
50 ppm/°C 0°C ≤ TA ≤ +70°C
— ppm/°C (“C” Commercial Temperature
Range Devices)
VCTC Temperature Coefficient of Analog
— — 75 ppm/°C 0°C ≤ TA ≤ +70°C
Common (with Respect to Positive Supply)
(“I” Industrial Temperature
Range Devices)
VSD TC7106A ONLY Peak to Peak
Segment Drive Voltage
4 5 6 V V+ to V- = 9V
(Note 4)
VBD TC7106A ONLY Peak to Peak
Backplane Drive Voltage
4 5 6 V V+ to V- = 9V
(Note 4)
TC7107A ONLY
Segment Sinking Current (Except Pin 19)
5
8.0 — mA V+ = 5.0V
Segment Voltage = 3V
TC7107A ONLY
Segment Sinking Current (Pin 19)
10 16 — mA V+ = 5.0V
Segment Voltage = 3V
Note 1: Input voltages may exceed the supply voltages, provided the input current is limited to ±100μA.
2: Dissipation rating assumes device is mounted with all leads soldered to printed circuit board.
3: Refer to “Differential Input” discussion.
4: Backplane drive is in phase with segment drive for “OFF” segment, 180° out of phase for “ON” segment.
Frequency is 20 times conversion rate. Average DC component is less than 50mV.
© 2006 Microchip Technology Inc.
DS21455C-page 5
5 Page 
6.0 DIGITAL SECTION (TC7107A)
Figure 6-2 shows a TC7107A block diagram. It is
designed to drive common anode LEDs. It is identical
to the TC7106A, except that the regulated supply and
backplane drive have been eliminated and the segment
drive is typically 8mA. The 1000’s output (Pin 19) sinks
current from two LED segments, and has a 16mA drive
capability.
In both devices, the polarity indication is “ON” for
negative analog inputs. If VIN- and VIN+ are reversed,
this indication can be reversed also, if desired.
The display font is the same as the TC7106A.
6.1 System Timing
The oscillator frequency is divided by 4 prior to clocking
the internal decade counters. The four-phase
measurement cycle takes a total of 4000 counts, or
16,000 clock pulses. The 4000-count cycle is indepen-
dent of input signal magnitude.
Each phase of the measurement cycle has the follow-
ing length:
1. Auto-zero phase: 1000 to 3000 counts (4000 to
12000 clock pulses).
For signals less than full scale, the auto-zero phase is
assigned the unused reference integrate time period:
2. Signal integrate: 1000 counts (4000 clock
pulses).
This time period is fixed. The integration period is:
EQUATION 6-1:
TSI = 4000
⎛1 ⎞
⎝FOSC ⎠
Where: FOSC is the externally set clock frequency.
3. Reference Integrate: 0 to 2000 counts (0 to 8000
clock pulses).
The TC7106A/7107A are drop-in replacements for the
7106/7107 parts. External component value changes
are not required to benefit from the low drift internal
reference.
6.2 Clock Circuit
Three clocking methods may be used (see Figure 6-1):
1. An external oscillator connected to Pin 40.
2. A crystal between Pins 39 and 40.
3. An RC oscillator using all three pins.
TC7106/A/TC7107/A
TC7106A
TC7107A
÷4 To
Counter
EXT
OSC
40
Crystal
39
38
RC Network
To TEST Pin on TSC7106A
To GND Pin on TSC7107A
FIGURE 6-1:
Clock Circuits
© 2006 Microchip Technology Inc.
DS21455C-page 11
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet TC7106.PDF ] | |
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