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參數(shù)資料
| 型號： | ICL7109 |
| 廠商： | Intersil Corporation |
| 英文描述： | 12-Bit,Microprocessor-Compatible A/D Converter(12位、微處理器兼容的A/D轉(zhuǎn)換器) |
| 中文描述： | 12位A/D轉(zhuǎn)換器，帶有三態(tài)二進(jìn)制輸出 |
| 文件頁數(shù)： | 6/23頁 |
| 文件大?。?/td> | 227K |
| 代理商： | ICL7109 |
5-9
Typical Integrator Amplifier Output Waveform (INT Pin)
Design Information Summary Sheet
OSCILLATOR FREQUENCY
f
OSC
= 0.45/RC
C
OSC
> 50pF; R
OSC
> 50k
f
OSC
(Typ) = 60kHz
or
f
OSC
(Typ) = 3.58MHz Crystal
OSCILLATOR PERIOD
t
OSC
= RC/0.45
t
OSC
= 1/3.58MHz (Crystal)
INTEGRATION CLOCK FREQUENCY
f
CLOCK
= f
OSC
(RC Mode)
f
CLOCK
= f
OSC
/58 (Crystal)
t
CLOCK
= 1/f
CLOCK
INTEGRATION PERIOD
t
INT
= 2048 x t
CLOCK
60/50Hz REJECTION CRITERION
t
INT
/t
60Hz
or t
lNT
/t
50Hz
= Integer
OPTIMUM INTEGRATION CURRENT
I
INT
= 20
μ
A
FULL-SCALE ANALOG INPUT VOLTAGE
V
lNFS
Typically = 200mV or 2V
INTEGRATE RESISTOR
V
INT
INTEGRATE CAPACITOR
t
INT
INTEGRATOR OUTPUT VOLTAGE SWING
t
INT
V
INT
MAXIMUM SWING
(V- + 0.5V) < V
INT
< (V+ - 0.5V)
V
INT
(Typ) = 2V
DISPLAY COUNT
CONVERSION CYCLE
t
CYC
= t
CL0CK
x 8192
(In Free Run Mode, Run/HOLD = 1)
when f
CLOCK
= 60kHz, t
CYC
= 133ms
COMMON MODE INPUT VOLTAGE
(V- + 2.0V) < V
lN
< (V+ - 2V)
AUTO-ZERO CAPACITOR
0.01
μ
F < C
AZ
< 1
μ
F
REFERENCE CAPACITOR
0.1
μ
F < C
REF
< 1
μ
F
V
REF
Biased between V+ and V-
V
REF
V+ - 2.8V
Regulation lost when V+ to V-
≤
6.4V.
If V
REF
is not used, float output pin.
POWER SUPPLY: DUAL
±
5.0V
V+ = +5V to GND
V- = -5V to GND
OUTPUT TYPE
Binary Amplitude with Polarity and Overrange Bits
Tips: Always tie TEST pin HIGH.
Don’t leave any inputs floating.
R
INT
----------------
=
C
INT
(
-------------------------------
)
I
(
)
=
V
INT
(
-------------------------------
)
I
(
)
=
COUNT
2048
----------------
×
=
AUTO ZERO PHASE
(COUNTS)
6143 - 2048
INTEGRATE
PHASE FIXED
2048 COUNTS
DE-INTEGRATE PHASE
0 - 4095 COUNTS
TOTAL CONVERSION TIME = 8192 x t
CLOCK
(IN FREE-RUN MODE)
ICL7109
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