ment decoders, display drivers, a reference, and a clock.
is designed to interface with a liquid crystal dis-
play (LCD) and includes a multiplexed backplane drive; the
7107 will directly drive an instrument size light emitting
diode (LED) display.
are high performance, low
• Low Noise - Less Than 15µV
P-P
7107 bring together a combination of
high accuracy, versatility, and true economy.
•
Low Power Dissipation -
Ordering Information
PART NO.
TEMP.
RANGE (
o
C)
PACKAGE
PKG. NO.
V+
D1
C1
B1
(1’ s)
A1
F1
G1
E1
D2
C2
(10’ s)
B2
A2
F2
E2
D3
(100’ s)
B3
F3
E3
(1000) AB4
(MINUS)
POL
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
40 OSC 1
39 OSC 2
38 OSC 3
37 TEST
36 REF HI
35 REF LO
34 C
REF
+
33 C
REF
-
32 COMMON
31 IN HI
30 IN LO
29 A-Z
28 BUFF
27 INT
26 V-
25 G2 (10’ s)
24 C3
23 A3
22 G3
21 BP/GND
(100’ s)
Wing Shing Computer Components Co., (H.K.)Ltd.
Homepage:
http://www.wingshing.com
Tel:(852)2341 9276 Fax:(852)2797 8153
E-mail: wsccltd@hkstar.com
Absolute Maximum Ratings
Supply Voltage
WS7106, V+ to V-…………………………….15v
WS7107, V+ to GND…………………….……6V
WS7107, V_ to GND……………………. ….-9V
Analog Input Voltage (Either Input) (Note 1)V+ to V-
Reference Input Voltage (Either Input)V+ to V-
Clock Input
WS7106TEST to V+
WS7107GND to V+
Thermal Information
Thermal Resistance (typical, Note 2)
θ
JA
(℃/W)
50
PDIP Package……………………………………………. …… …………
Maximum Junction Temperature…………………………………….. ………150℃
Maximum Storage Temperature Range………………….………..-65℃ to 150℃
Operating Conditions
Temperature Range…………………………0℃ to 70℃
CAUTION: Stresses above those listed in “absolute Maximum Ratings” may cause permanent damage to the device. This is a stress only rating and operation
Of the device at these or any other conditions above those indicated in the operational sections of this specification is not implied.
Notes:
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 on board in fee air.
Electrical specifications
PARAMETER
SYSTEM PERFORMACE
Zero Input Reading
Ratiometric Reading
(Note 3)
TEST CONDITIONS
MIN
TYP
MAX
UNIT
V
IN
=0.0V, FULL Scale = 200mV
V
IN
= V
REF
, V
REF
= 100mV
-V
IN
=+V
IN
=200mV
Difference in Reading for Equal Positive and
Negative Inputs Near Full Scale
Full Scale = 200mV or Full Scale = 2V Maximum
Deviation from Best Straight Line Fit (note 6)
V
CM
= 1V, V
IN
= 0V, Full Scale = 200mv(Note 6)
V
IN
= 0 (Does Not Include LED Current for WS7107
WS7107 Only
25kΩ Between Common and Positive Supply (With
Respect to + Supply)
V
IN
=0V Full Scale=200mV
V
IN
=0V
25K between Common and V+ 0℃-70℃
V
IN
=199mV 0℃-70℃Ext. ref. 0ppm/℃
V
IN
=0℃V-70℃
-000.0
999
±000.0
999/1000
+000.0
1000
Digital
Reading
Digital
Reading
Counts
Rollover Error
-1
0.2
+1
Linearity
Common Mode Rejection Ratio
End Power Supply Character V+ Supply Current
End Power Supply Character V- Supply Current
COMMON Pin Analog Common Voltage
Noise (P
K
-P
K
Value not exceeded 95% of time)
Input Leakage Current
Analog COMMON Temperature Coefficient
Scale Factor Temperature Coefficient
Zero Reading Drift
-1
-
-
-
2.4
0.2
50
0.5
0.5
3.0
15
1
60
60
0.2
+1
-
1.8
1.8
3.2
Counts
μV/V
mA
mA
V
uV
P-P
10
75
75
1
pA
ppm/℃
ppm/℃
uV/℃
DISPLAY DRIVER
WS7106 ONLY
Peak-to-Peak Segment Drive Voltage
Peak-to-Peak Backplane Drive Voltage
V+ = to V- = 9V (Note 5)
4
5
6
V
Electrical Specifications
PARAMETER
(Continued)
TEST CONDITIONS
MIN
TYP
MAX
UNIT
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
NOTES:
3. Dissipation rating assumes device is mounted with all leads soldered to printed circuit board.
Typical Applications and Test Circuits
+
R
1
R
3
OSC 1 40
OSC 2 39
OSC 3 38
C
4
TEST 37
R
4
C
1
R
5
C
5
C
2
R
2
C
3
DISPLAY
REF HI 36
REF LO 35
C
REF
+ 34
C
REF
- 33
COM 32
IN HI 31
IN LO 30
A-Z 29
BUFF 28
INT 27
V- 26
G2 25
C3 24
A3 23
G3 22
DISPLAY
7106 TEST CIRCUIT AND TYPICAL APPLICATION WITH LCD DISPLAY COMPONENTS SELECTED FOR 200mV
FULL SCALE
+5V
R
5
C
1
C
5
C
2
R
2
C
3
DISPLAY
+
IN
-
-5V
R
1
R
3
OSC 1 40
OSC 2 39
OSC 3 38
C
4
TEST 37
R
4
20 POL
19 AB4
G1
D1
C1
B1
A1
D2
10 C2
11 B2
12 A2
15 D3
16 B3
V+
E1
14 E2
18 E3
F1
13 F2
17 F3
1
2
3
4
5
6
7
8
9
BP 21
REF HI 36
REF LO 35
C
REF
+ 34
C
REF
- 33
COM 32
IN HI 31
IN LO 30
A-Z 29
BUFF 28
INT 27
V- 26
G2 25
C3 24
A3 23
G3 22
DISPLAY
7107 TEST CIRCUIT AND TYPICAL APPLICATION WITH LED DISPLAY COMPONENTS SELECTED FOR 200mV
FULL SCALE
20 POL
19 AB4
G1
D2
10 C2
11 B2
12 A2
15 D3
16 B3
D1
C1
B1
A1
V+
E1
14 E2
18 E3
13 F2
17 F3
1
2
3
4
5
6
F1
7
8
9
GND 21
-
C
1
= 0.1µF
C
2
= 0.47µF
C
3
= 0.22µF
C
4
= 100pF
C
5
= 0.02µF
R
1
= 24kΩ
R
2
= 47kΩ
R
3
= 100kΩ
R
4
= 1kΩ
R
5
= 1MΩ
C
1
= 0.1µF
C
2
= 0.47µF
C
3
= 0.22µF
C
4
= 100pF
C
5
= 0.02µF
R
1
= 24kΩ
R
2
= 47kΩ
R
3
= 100kΩ
R
4
= 1kΩ
R
5
= 1MΩ
+
IN
-
9V
Design Information Summary Sheet
• OSCILLATOR FREQUENCY
f
OSC
= 0.45/RC
C
OSC
> 50pF; R
OSC
> 50kΩ
f
OSC
(Typ) = 48kHz
• OSCILLATOR PERIOD
t
OSC
= RC/0.45
• INTEGRATION CLOCK FREQUENCY
f
CLOCK
= f
OSC
/4
• INTEGRATION PERIOD
t
INT
= 1000 x (4/f
OSC
)
• 60/50Hz REJECTION CRITERION
t
INT
/t
60Hz
or t
lNT
/t
60Hz
= Integer
• OPTIMUM INTEGRATION CURRENT
I
INT
= 4µA
• FULL SCALE ANALOG INPUT VOLTAGE
V
lNFS
(Typ) = 200mV or 2V
• INTEGRATE RESISTOR
V
INFS
R
INT
= ----------------
-
I
INT
• DISPLAY COUNT
V
IN
-
COUNT
=
1000
×
--------------
V
REF
• CONVERSION CYCLE
t
CYC
= t
CL0CK
x 4000
t
CYC
= t
OSC
x 16,000
when f
OSC
= 48kHz; t
CYC
= 333ms
• COMMON MODE INPUT VOLTAGE
(V- + 1V) < V
lN
< (V+ - 0.5V)
• AUTO-ZERO CAPACITOR
0.01µF < C
AZ
< 1µF
• REFERENCE CAPACITOR
0.1µF < C
REF
< 1µF
• V
COM
Biased between Vi and V-.
• V
COM
≅
V+ - 2.8V
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.
7106 POWER SUPPLY: SINGLE 9V
V+ - V- = 9V
Digital supply is generated internally
V
GND
≅
V+ - 4.5V
•
Type: Direct drive with digital logic supply amplitude.
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