数据搜索系统,热门电子元器件搜索
  Chinese  ▼
ALLDATASHEETCN.COM

X  

TC7136CLW 数据表(PDF) 9 Page - TelCom Semiconductor, Inc

部件名 TC7136CLW
功能描述  LOW POWER, 3-1/2 DIGIT ANALOG-TO-DIGITAL CONVERTERS
Download  12 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
制造商  TELCOM [TelCom Semiconductor, Inc]
网页  http://www.telcom-semi.com
标志 TELCOM - TelCom Semiconductor, Inc

TC7136CLW 数据表(HTML) 9 Page - TelCom Semiconductor, Inc

Back Button TC7136CLW Datasheet HTML 4Page - TelCom Semiconductor, Inc TC7136CLW Datasheet HTML 5Page - TelCom Semiconductor, Inc TC7136CLW Datasheet HTML 6Page - TelCom Semiconductor, Inc TC7136CLW Datasheet HTML 7Page - TelCom Semiconductor, Inc TC7136CLW Datasheet HTML 8Page - TelCom Semiconductor, Inc TC7136CLW Datasheet HTML 9Page - TelCom Semiconductor, Inc TC7136CLW Datasheet HTML 10Page - TelCom Semiconductor, Inc TC7136CLW Datasheet HTML 11Page - TelCom Semiconductor, Inc TC7136CLW Datasheet HTML 12Page - TelCom Semiconductor, Inc  
Zoom Inzoom in Zoom Outzoom out
 9 / 12 page
background image
3-255
TELCOM SEMICONDUCTOR, INC.
7
6
5
4
3
1
2
8
Component
Value
Nominal Full-Scale Voltage
200mV
2V
CAZ
0.47
µF
0.1
µF
RINT
180 k
1.8 M
CINT
0.047
µF
0.047
µF
NOTE:fOSC = 48 kHz (3 readings per sec). ROSC = 180kΩ, COSC = 50
output voltage back to zero during the reference integrate
phase, is stored on CREF. A 0.1 µF capacitor is acceptable
when V
REF is tied to analog common. If a large common-
mode voltage exists (V
REF ≠ analog common) and the
application requires a 200 mV full scale, increase CREF to
1
µF. Roll-over error will be held to less than 0.5 count. A
Mylar-type dielectric capacitor is adequate.
Integrating Capacitor (CINT)
CINT should be selected to maximize integrator output
voltage swing without causing output saturation. Analog
common will normally supply the differential voltage refer-
ence this case, a
±2V full-scale integrator output swing is
satisfactory. For 3 readings per second (fOSC = 48 kHz) a
0.047
µF value is suggested. For one reading per second,
0.15
µF is recommended. If a different oscillator frequency
is used, CINT must be changed in inverse proportion to
maintain the nominal
±2V integrator swing.
An exact expression for CINT is:
Oscillator Components
COSC should be 50 pF. ROSC is selected from the
equation:
fOSC =
.
Note that fOSC is 4 to generate the TC7136A's internal
clock. The backplane drive signal is derived by dividing fOSC
by 800.
To achieve maximum rejection of 60Hz noise pickup,
the signal integrate period should be a multiple of 60Hz.
Oscillator frequencies of 240kHz, 120kHz, 80kHz, 60kHz,
40kHz, etc. should be selected. For 50 Hz rejection, oscil-
lator frequencies of 200kHz, 100kHz, 66-2/3 kHz, 50kHz,
40kHz, etc. would be suitable. Note that 40kHz (2.5 read-
ings per second) will reject both 50Hz and 60Hz.
Reference Voltage Selection
A full-scale reading (2000 counts) requires the input
signal be twice the reference voltage.
0.45
RC
In some applications, a scale factor other than unity may
exist between a transducer output voltage and the required
digital reading. Assume, for example, a pressure transducer
output for 2000 lb/in.2 is 400 mV. Rather than dividing the
input voltage by two, the reference voltage should be set to
200 mV. This permits the transducer input to be used
directly.
The differential reference can also be used when a
digital zero reading is required when VIN is not equal to zero.
This is common in temperature measuring instrumentation.
A compensating offset voltage can be applied between
analog common and V
IN The transducer output is connected
between V
+
IN and analog common.
DEVICE PIN FUNCTIONAL DESCRIPTION
Differential Signal Inputs
V
+
IN (Pin 31), V
IN (Pin 30)
The TC7136/A is designed with true differential inputs
and accepts input signals within the input stage common-
mode voltage range (VCM). The typical range is V+ –1V to V
+1V. Common-mode voltages are removed from the system
when the TC7136A operates from a battery or floating power
source (isolated from measured system), and VIN
is con-
nected to analog common (VCOM). (See Figure 7.)
Required Full-Scale Voltage*
VREF
200 mV
100 mV
2V
1V
*VFS = 2 VREF.
where: fOSC = Clock frequency at pin 38
VFS = Full-scale input voltage
RINT = Integrating resistor
VINT = Desired full-scale integrator output swing.
CINT must have low dielectric absorption to minimize
roll-over error. A polypropylene capacitor is recommended.
Integrating Resistor (RINT)
The input buffer amplifier and integrator are designed
with Class A output stages. The output stage idling current
is 6
µA. The integrator and buffer can supply 1 µA drive
currents with negligible linearity errors. RINT is chosen to
remain in the output stage linear drive region, but not so
large that PC board leakage currents induce errors. For a
200 mV full scale, RINT is 180 kΩ. A 2V full scale requires
1.8 M
Ω.
CINT =,
1
fOSC
(
VFS
RINT
(
)
)
(4000)
VINT
LOW POWER, 3-1/2 DIGIT
ANALOG-TO-DIGITAL CONVERTERS
TC7136
TC7136A


类似零件编号 - TC7136CLW

制造商部件名数据表功能描述
logo
Microchip Technology
TC7136CLW MICROCHIP-TC7136CLW Datasheet
534Kb / 22P
   Low Power 3-1/2 Digit Analog-to-Digital Converter
2002
More results

类似说明 - TC7136CLW

制造商部件名数据表功能描述
logo
Microchip Technology
TC7106 MICROCHIP-TC7106_06 Datasheet
534Kb / 32P
   3-1/2 Digit Analog-to-Digital Converters
2006
TC7126 MICROCHIP-TC7126_06 Datasheet
429Kb / 26P
   3-1/2 Digit Analog-to-Digital Converters
2006
TC7106 MICROCHIP-TC7106 Datasheet
623Kb / 26P
   3-1/2 Digit Analog-to-Digital Converters
2002
TC7126 MICROCHIP-TC7126 Datasheet
553Kb / 22P
   3-1/2 Digit Analog-to-Digital Converters
2002
logo
TelCom Semiconductor, I...
TC7126 TELCOM-TC7126 Datasheet
198Kb / 13P
   3-1/2 DIGIT ANALOG-TO-DIGITAL CONVERTERS
logo
Microchip Technology
TC7126 MICROCHIP-TC7126_13 Datasheet
330Kb / 28P
   3-1/2 Digit Analog-to-Digital Converters
11/29/12
TC7107RCPL MICROCHIP-TC7107RCPL Datasheet
411Kb / 34P
   3-1/2 Digit Analog-to-Digital Converters
01/02/08
logo
TelCom Semiconductor, I...
TC7116 TELCOM-TC7116 Datasheet
218Kb / 14P
   3-1/2 DIGIT ANALOG-TO-DIGITAL CONVERTERS WITH HOLD
logo
Microchip Technology
TC7116 MICROCHIP-TC7116_06 Datasheet
425Kb / 24P
   3-1/2 Digit Analog-to-Digital Converters with Hold
2006
TC7116 MICROCHIP-TC7116_13 Datasheet
322Kb / 26P
   3-1/2 Digit Analog-to-Digital Converters with Hold
11/29/12
More results


Html Pages

1 2 3 4 5 6 7 8 9 10 11 12


数据表 下载

Go To PDF Page


链接网址




隐私政策
ALLDATASHEETCN.COM
ALLDATASHEET是否为您带来帮助?  [ DONATE ] 

关于 Alldatasheet   |   广告服务   |   联系我们   |   隐私政策   |   链接交换   |   制造商名单
All Rights Reserved©Alldatasheet.com


Mirror Sites
English : Alldatasheet.com  |   English : Alldatasheet.net  |   Chinese : Alldatasheetcn.com  |   German : Alldatasheetde.com  |   Japanese : Alldatasheet.jp
Russian : Alldatasheetru.com  |   Korean : Alldatasheet.co.kr  |   Spanish : Alldatasheet.es  |   French : Alldatasheet.fr  |   Italian : Alldatasheetit.com
Portuguese : Alldatasheetpt.com  |   Polish : Alldatasheet.pl  |   Vietnamese : Alldatasheet.vn
Indian : Alldatasheet.in  |   Mexican : Alldatasheet.com.mx  |   British : Alldatasheet.co.uk  |   New Zealand : Alldatasheet.co.nz
Family Site : ic2ic.com  |   icmetro.com