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參數(shù)資料
| 型號： | TC826 |
| 廠商： | TelCom Semiconductor, Inc. |
| 英文描述： | A/D CONVERTER WITH BAR GRAPH DISPLAY OUTPUT |
| 中文描述： | 的A / D轉(zhuǎn)換器條形圖顯示輸出 |
| 文件頁數(shù)： | 7/12頁 |
| 文件大?。?/td> | 122K |
| 代理商： | TC826 |
3-177
TELCOM SEMICONDUCTOR, INC.
7
6
5
4
3
1
2
8
DE–
DE+
DE+
DE–
AZ
+
–
+
–
+
–
BUFFER
AZ
COMPARATOR
INTEGRATOR
RINT
TO DIGITAL
SECTION
CMPTR
REF IN
5
6
7
9
10
CAZ
CINT
11
VDD
8
INT
INT
≈
VDD– 2.9V
3
+ INPUT
ANALOG
COMMON
2
– INPUT
4
CREF
+
–
≈
VDD
12
AZ
INT
AZ
1
μ
A
VDD
VDD
≈
6.3V
TC826
ANALOG SWITCH
FROM
DIGITAL
CONTROL
SECTION
AZ
INT
DE+
DE–
Figure 4. TC826 Analog Section
THEORY OF OPERATION
Analog Section
In addition to the basic signal integrate and deintegrate
cycles discussed above, the TC826 incorporates an auto-
zero cycle. This cycle removes buffer amplifier, integrator,
and comparator offset voltage error terms from the conver-
sion. A true digital zero reading results without external
adjusting potentiometers. A complete conversion consists
of three cycles: an auto-zero, signal integrate and reference
cycle. (Figures 4 and 5.)
Auto-Zero Cycle
During the auto-zero cycle the differential input signal is
disconnected from the circuit by opening internal analog
gates. The internal nodes are shorted to analog common
(internal analog ground) to establish a zero input condition.
Additional analog gates close a feedback loop around the
integrator and comparator. This loop permits comparator
offset voltage error compensation. The voltage level estab-
lished on CAZ compensates for device offset voltages.
The auto-zero cycle length is 19 counts minimum.
Unused time in the deintegrate cycle is added to the auto-
zero cycle.
Signal Integration Cycle
The auto-zero loop is opened and the internal differen-
tial inputs connect to +IN and –IN. The differential input
signal is integrated for a fixed time period. The TC826 signal
integration period is 20 clock periods or counts. The exter-
nally set clock frequency is divided by 32 before clocking the
internal counters. The integration time period is:
Where:
F
OSC
= External Clock Frequency
T
= 32 x 20
F
OSC
TC826
A/D CONVERTER WITH
BAR GRAPH DISPLAY OUTPUT
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