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参数资料
| 型号： | HI7106CPL |
| 厂商： | INTERSIL CORP |
| 元件分类： | ADC |
| 英文描述： | 3 1/2 Digit, LCD/LED Display, A/D Converter |
| 中文描述： | 1-CH 3-BIT DUAL-SLOPE ADC, PARALLEL ACCESS, PDIP40 |
| 封装： | PLASTIC, DIP-40 |
| 文件页数： | 4/11页 |
| 文件大小： | 123K |
| 代理商： | HI7106CPL |
4
Typical Integrator Amplifier Output Waveform (INT Pin)
Detailed Description
Analog Section
Figure 2 shows the Analog Section for the HI7106. Each
measurement cycle is divided into three phases. They are
(1) auto-zero (A-Z), (2) signal integrate (INT) and (3) de-inte-
grate (DE).
Auto-Zero Phase
During auto-zero three things happen. First, input high and
low are disconnected from the pins and internally shorted to
analog COMMON. Second, the reference capacitor is
charged to the reference voltage. Third, a feedback loop is
closed around the system to charge the auto-zero capacitor
C
AZ
to compensate for offset voltages in the buffer amplifier,
integrator, and comparator. Since the comparator is included
in the loop, the A-Z accuracy is limited only by the noise of
the system. In any case, the offset referred to the input is
less than 10
μ
V.
Signal Integrate Phase
During signal integrate, the auto-zero loop is opened, the
internal short is removed, and the internal input high and low
are connected to the external pins. The converter then
integrates the differential voltage between IN HI and IN LO
for a fixed time. This differential voltage can be within a wide
common mode range: up to 1V from either supply. If, on the
other hand, the input signal has no return with respect to the
converter power supply, IN LO can be tied to analog
COMMON to establish the correct common mode voltage. At
the end of this phase, the polarity of the integrated signal is
determined.
AUTO ZERO PHASE
(COUNTS)
2999 - 1000
SIGNAL INTEGRATE
PHASE FIXED
1000 COUNTS
DE-INTEGRATE PHASE
0 - 1999 COUNTS
TOTAL CONVERSION TIME = 4000 x t
CLOCK
= 16,000 x t
OSC
FIGURE 2. ANALOG SECTION OF HI7106
DE-
DE+
C
INT
C
AZ
R
INT
BUFFER
A-Z
INT
-
+
A-Z
COMPARATOR
IN HI
COMMON
IN LO
31
32
30
DE-
DE+
INT
A-Z
34
C
REF
+
36
REF HI
C
REF
REF LO
35
A-Z
A-Z
33
C
REF
-
28
29
27
TO
DIGITAL
SECTION
A-Z AND DE( )
INTEGRATOR
INT
STRAY
STRAY
V+
10mA
V-
N
INPUT
HIGH
2.8V
6.2V
V+
1
INPUT
LOW
-
+
-
+
-
+
HI7106
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相关代理商/技术参数 |
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|---|---|
| HI7106D | 制造商:INTERSIL 制造商全称:Intersil Corporation 功能描述:3 1/2 Digit, LCD/LED Display, A/D Converter |
| HI7131 | 制造商:INTERSIL 制造商全称:Intersil Corporation 功能描述:3 1/2 Digit, Low Power, High CMRR, LCD/LED Display-Type A/D Converters |
| HI7131_02 | 制造商:INTERSIL 制造商全称:Intersil Corporation 功能描述:3 1/2 Digit, Low Power, High CMRR, LCD/LED Display-Type A/D Converters |
| HI7131CM44 | 制造商:Rochester Electronics LLC 功能描述:- Bulk 制造商:Harris Corporation 功能描述: |
| HI7131CM44S2324 | 制造商:Rochester Electronics LLC 功能描述:- Bulk 制造商:Harris Corporation 功能描述: |
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