SC7106/7107
3
1
/
2
DIGITS, LCD/LED DISPLAY , A/D CONVERTERS FOR DMM
DESCRIPTION
The SC7106 and SC7107 are high performance, low power, 3
1
/
2
digit
A/D converters. Included are seven segment decoders, display drivers, a
reference, and a clock. The SC7106 is designed to interface with a liquid
crystal display (LCD) and includes a multiplexed backplane drive; the
SC7107 will directly drive an instrument size light emitting diode (LED)
display.
The SC7106 and SC7107 bring together a combination of high
accuracy, versatility, and true economy. It features auto-zero to less than
10µV, zero drift of less than 1µV/°C, input bias current of 10pA (Max),
and rollover error of less than one count. True differential inputs and
reference are useful in all systems, but give the designer an uncommon
advantage when measuring load cells, strain gauges and other bridge
type transducers. Finally, the true economy of single power supply
operation (SC7106), enables a high performance panel meter to be built
with the addition of only 10 passive components and a display.
QFP-44-10 x10-0.8
DIP-40-600-2.54
FEATURES
* Guaranteed zero reading for 0V
input on all scales
* True polarity at zero for precise
null detection
* Low power dissipation-typically
ORDERING INFORMATION
Part No.
SC7106CPL
SC7106RCPL
SC7106
SC7107CPL
SC7107RCPL
SC7107
Temp. Range(°C)
0~70
0~70
0~70
0~70
0~70
0~70
Package
DIP-40-600-2.54
DIP-40-600-2.54
QFP-44-10X10-0.8
DIP-40-600-2.54
DIP-40-600-2.54
QFP-44-10X10-0.8
less than 10mW
* True differential input and
reference, direct display drive-
LCD SC7106, LED SC7107
* Low noise (less than 15µVp-p)
* On chip clock and reference
* 1pA typical input current
* No additional active circuits
required
NOTE: “ indicates device with reversed leads for mounting to PC board
R”
underside.
HANGZHOU SILAN MICROELECTRONICS CO.,LTD
Http: www.silan.com.cn
REV:1.2
2006.02.27
Page 1 of 22
SC7106/7107
BLOCK DIAGRAM
ABSOLUTE MAXIMUM RATING
Characteristics
SC7106
Supply Voltage SC7107
SC7107
Analog Input Voltage(Either Input) (Note 1)
Reference Input Voltage(Either Input)
Clock Input
SC7106
SC7107
Topr
Tstg
θ
JA
Symbol
V+ ~ V-
V+ ~ GND
V- ~ GND
Value
15
6
-9
V+ ~ V-
V+ ~ V-
TEST to V+
GND to V+
0 ~ +70
-65 ~ 150
50
150
°C
°C
°C/W
°C
V
Unit
Operating Temperature
Storage Temperature
Thermal resistance(typical) (Note 2)
Maximum Junction Temperature
NOTE: 1. Input voltages may exceed the supply voltages provided the input current is limited to
±100µA.
2.
θ
JA
is measured with the component mounted on an evaluation PC board in free air.
3. Not tested, guaranteed by design.
4. Back plane drive is in phase with segment drive for "off" segment, 180 degrees out of phase for "on"
segment. Frequency is 20 times conversion rate. Average DC component is less than 50mV.
HANGZHOU SILAN MICROELECTRONICS CO.,LTD
Http: www.silan.com.cn
REV:1.2
2006.02.27
Page 2 of 22
SC7106/7107
ELECTRICAL CHARACTERISTICS
(Unless otherwise noted, specificatons apply to both the SC7106 and
SC7107 at T
amb
=25°C, F
clock
=48kHz, SC7106 is tested in the circuit of Figure 1. SC7107 is tested in the circuit
of Figure 2.)
Characteristics
SYSTEM PERFORMANCE
Zero Input Reading
Ratiometric Reading
V
IN
=0.0V, Full Scale=200mV
V
IN
=V
REF
, V
REF
=100mV
-V
IN
=+V
IN
≈
200mV
Rollover Error
Difference In Reading For Equal Positive
And Negative Inputs Near Full Scale
Full Scale =200mV Or Full Scale =2V
Linearity
Maximum Deviation From Best Straight
Line Fit (Note 3)
Common Mode Rejection Ratio
Noise
Leakage Current Input
Zero Reading Drift
Scale Factor Temperature Coefficient
End Power Supply Character V+
Supply Current
End Power Supply Character V-
Supply Current
COMMON Pin Analog Common
Voltage
Temperature Coefficient Of Analog
Common
DISPLAY DRIVER
(SC7106 ONLY)
Peak-To-Peak Segment Drive Voltage
Peak-To-Peak Backplane Drive
Voltage
DISPLAY DRIVER
(SC7107 ONLY)
Segment Sinking Current
(Except Pins 19 And 20)
Pin 19 Only
Pin 20 Only
V+=5V, Segment Voltage=3V
5
10
4
8
16
7
--
--
--
mA
mA
mA
V+ To V-=9V(Note 4)
4
5.5
6
V
V
CM
=1V,V
IN
=0V,Full Scale=200mV (Note
3)
V
IN
=0V,Full Scale=200mV,(Peak-To-Peak
Value Not Exceeded 95% of Time)
V
IN
=0(Note 3)
V
IN
=0, 0°C To 70°C(Note 3)
V
IN
=199mV, 0°C TO 70°C
(Ext.Ref.0ppm/°C) (Note 3)
V
IN
=0(Does Not Include LED Current For
SC7107)
SC7107 Only
25kΩ Between Common And Positive
Supply (With Respect To V+ Supply)
25kΩ Between Common And Positive
Supply (With Respect To V+ Supply)
--
--
--
--
--
--
--
2.4
--
50
15
1
0.2
1
1.0
0.6
3.0
80
--
--
10
1
5
1.8
1.8
3.2
--
µV/V
µV
pA
µV/°C
ppm/°C
mA
mA
V
ppm/°C
--
±0.2
±1
Counts
--
±0.2
±1
Counts
-000.0
999
±000.
+000. Digital
0
999/
1000
0
1000
Reading
Digital
Reading
Test Conditions
Min.
Typ. Max.
Unit
HANGZHOU SILAN MICROELECTRONICS CO.,LTD
Http: www.silan.com.cn
REV:1.2
2006.02.27
Page 3 of 22
SC7106/7107
PIN CONFIGURATION
BP/GND
POL
AB4
G2
G3
C3
LB
A3
E3
INTEN
HOLD
TEST
OSC3
OSC2
OSC1
D1
C1
HANGZHOU SILAN MICROELECTRONICS CO.,LTD
Http: www.silan.com.cn
DEEN
V+
B1
B3
F3
REV:1.2
2006.02.27
Page 4 of 22
SC7106/7107
DESIGN INFORMATION SUMMARY SHEET
OSCILLATOR FREQUENCY
OSCILLATOR PERIOD
INTEGRATION CLOCK FREQUENCY
INTEGRATION PERIOD
60/50Hz REJECTION CRITERION
OPTIMUM INTEGRATION CURRENT
FULL SCALE ANALOG INPUT
VOLTAGE
INTEGRATE RESISTOR
INTEGRATE CAPACITOR
INTEGRATOR OUTPUT VOLTAGE
SWING
V
INT
MAXIMUM SWING
DISPLAY COUNT
CONVERSION CYCLE
COMMON MODE INPUT VOLTAGE
AUTO-ZERO CAPACITOR
REFERENCE CAPACITOR
V
COM
V
COM
≈
V
+
−2.8V
SC7106 POWER SUPPLY: SINGLE 9V
SC7106 DISPLAY: LCD
SC7107 POWER SUPPLY:DUAL±5.0V
SC7107 DISPLAY: LED
fosc=0.45/RC; Cosc>50pF; Rosc>50kΩ; fosc(Typ)=48kHz
tosc=RC/0.45
Fclock=fosc/4
t
INT
=1000x(4/fosc)
t
INT
/ t
60Hz
or t
INT
/ t
50Hz
=Integer
I
INT
=4µA
V
INFS
(Typ)=200mV or 2V
R
INT
=V
INFS
/I
INT
C
INT
=(t
INT
) (I
INT
)/V
INT
V
INT
=(t
INT
) (I
INT
)/C
INT
(V-+0.5V)<V
INT
<(V+-0.5V), V
INT
(Typ)=2V
COUNT=1000x (V
IN
/V
REF
)
t
CYC
=t
CLOCK
x4000; t
CYC
=toscx16000;
when fosc=48kHz; t
CYC
=333ms
(V-+1V)<V
IN
<(V+-0.5V)
0.01µF<C
AZ
<1µF
0. 1µF<C
REF
<1µF
Biased between Vi and V-
Regulation lost when V+ to V-<≈6.8V ;if V
COM
is externally pulled
down to (V+ to V-)/2, the V
COM
circuit will turn off.
V+ to V-=9V, digital supply is generated internally,
V
GND
≈V
+
−4.5V
Type: Direct drive with digital logic supply amplitude.
V+=+5V TO GND, V-=-5V TO GND, Digital Logic and LED driver
supply V+ to GND
Type: Non-Multiplexed Common Anode
HANGZHOU SILAN MICROELECTRONICS CO.,LTD
Http: www.silan.com.cn
REV:1.2
2006.02.27
Page 5 of 22
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