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參數資料
| 型號： | ADM1020 |
| 廠商： | Analog Devices, Inc. |
| 元件分類： | 圓形連接器 |
| 英文描述： | Circular Connector; No. of Contacts:26; Series:LJT06R; Body Material:Aluminum; Connecting Termination:Crimp; Connector Shell Size:17; Circular Contact Gender:Socket; Circular Shell Style:Straight Plug; Insert Arrangement:17-26 |
| 中文描述： | 8引腳，低成本，系統溫度監控 |
| 文件頁數： | 5/12頁 |
| 文件大小： | 132K |
| 代理商： | ADM1020 |
REV. 0
ADM1020
–5–
FREQUENCY – Hz
10
0
50
50M
500
T
8
C
5k
50k
500k
5M
6
5
4
2
1
3
10mV SQ. WAVE
9
8
7
100k
25M
Figure 7. Temperature Error vs. Differential-Mode Noise
Frequency
CONVERSION RATE – Hz
200
00
8
0.125
S
m
A
0.25
0.5
1
2
4
180
80
60
40
20
140
100
160
120
V
CC
= +5V
V
CC
= +3.3V
Figure 8. Operating Supply Current vs. Conversion
Rate
SUPPLY VOLTAGE – Volts
100
40
–200
1.1
S
m
A
1.3
1.5 1.7
1.9
2.1
2.3 2.5
2.7
2.9
3.5
4.5
80
60
20
0
ADDX = HI-Z
ADDX = GND
Figure 9. Standby Supply Current vs. Supply Voltage
TIME – Sec
125
100
0
T = 0
T = 10
T = 2
T
8
C
T = 4
T = 6
T = 8
75
50
25
IMMERSED
IN +115
C
FLUORINERT BATH
Figure 10. Response to Thermal Shock
FUNCTIONAL DESCRIPTION
The ADM1020 contains a two-channel A-to-D converter with
special input-signal conditioning to enable operation with
remote and on-chip diode temperature sensors. When the
ADM1020 is operating normally, the A-to-D converter operates
in a free-running mode. The analog input multiplexer alternately
selects either the on-chip temperature sensor to measure its local
temperature, or the remote temperature sensor. These signals
are digitized by the ADC and the results stored in the local and
remote temperature value registers as 8-bit, twos complement
words.
The measurement results are compared with local and remote,
high and low temperature limits, stored in four on-chip regis-
ters. Out of limit comparisons generate flags that are stored in
the Status Register, and one or more out-of-limit results will
cause the
ALERT
output to pull low.
The limit registers can be programmed, and the device con-
trolled and configured, via the serial System Management Bus
(SMBus). The contents of any register can also be read back via
the SMBus.
Control and configuration functions consist of:
– switching the device between normal operation and standby
mode.
– masking or enabling the
ALERT
output.
– selecting the conversion rate.
MEASUREMENT METHOD
A simple method of measuring temperature is to exploit the
negative temperature coefficient of a diode, or the base-emitter
voltage of a transistor, operated at constant current. Unfortu-
nately, this technique requires calibration to null out the effect
of the absolute value of V
BE
, which varies from device to device.
The technique used in the ADM1020 is to measure the change
in V
BE
when the device is operated at two different currents.
This is given by:
V
BE
=
KT
/
q
×
ln
(
N
)
where:
K
is Boltzmann’s constant.
q
is charge on the electron (1.6
×
10
–19
Coulombs).
T
is absolute temperature in Kelvins.
N
is ratio of the two currents.
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| ADM1020AR-REEL | Circular Connector; No. of Contacts:26; Series:LJT06R; Body Material:Aluminum; Connecting Termination:Crimp; Connector Shell Size:17; Circular Contact Gender:Socket; Circular Shell Style:Straight Plug; Insert Arrangement:17-26 |
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