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參數(shù)資料
| 型號： | TC510COG |
| 廠商： | Microchip Technology Inc. |
| 英文描述： | Precision Analog Front Ends |
| 中文描述： | 精密模擬前端 |
| 文件頁數(shù)： | 8/17頁 |
| 文件大小： | 209K |
| 代理商： | TC510COG |
3-26
TELCOM SEMICONDUCTOR, INC.
Analog Input Signal Integration Phase
(INT)
The TC5xx integrates the differential voltage between
the (V
+N
) and (V
–N
) inputs. The differential voltage must be
within the device's common-mode range V
CMR
.
The input signal polarity is normally checked via soft-
ware at the end of this phase: CMPTR = 1 for positive
polarity; CMPTR = 0 for negative polarity.
Reference Voltage Deintegration Phase
(DINT)
The previously charged reference capacitor is con-
nected with the proper polarity to ramp the integrator output
back to zero. An externally-provided, precision timer is used
to measure the duration of this phase. The resulting time
measurement is proportional to the magnitude of the applied
input voltage.
Integrator Output Zero Phase
(IZ)
This phase guarantees the integrator output is at 0V
when the Auto Zero phase is entered and that only system
offset voltages are compensated. This phase is used at the
end of the reference voltage deintegration phase and MUST
be used for ALL TC5xx applications having resolutions of 12
bits or more. If this phase is not used, the value of the Auto-
Zero capacitor (C
AZ
) must be about 2 to 3 times the value of
the integration capacitor (C
INT
) to reduce the effects of
charge-sharing. The Integrator Output Zero phase should
be programmed to operate until the Output of the Compara-
tor returns "HIGH". The overall Timing System is shown in
Figure 8.
ANALOG SECTION
Differential Inputs
(V
+
IN
, V
–
IN
)
The TC5xx operates with differential voltages within the
input amplifier common-mode range. The amplifier com-
mon-mode range extends from 1.5V below positive supply
to 1.5V above negative supply. Within this common-mode
voltage range, common-mode rejection is typically 80dB.
Full accuracy is maintained, however, when the inputs are
no less than 1.5V from either supply.
The integrator output also follows the common-mode
voltage. The integrator output must not be allowed to satu-
rate. A worst-case condition exists, for example, when a
large, positive common-mode voltage with a near full-scale
negative differential input voltage is applied. The negative
input signal drives the integrator positive when most of its
swing has been used up by the positive common-mode
voltage. For these critical applications, the integrator swing
can be reduced. The integrator output can swing within 0.9V
of either supply without loss of linearity.
Analog Common
Analog common is used as V
IN
return during system-
zero and reference deintegrate. If V
–
common, a common-mode voltage exists in the system.
This signal is rejected by the excellent CMR of the converter.
In most applications, V
–
(i.e., power supply common). A common-mode voltage will
exist when V
–
IN
is different from analog
IN
will be set at a fixed known voltage
IN
is not connected to analog common.
Differential Reference
(V
+
The reference voltage can be anywhere within 1V of the
power supply voltage of the converter. Roll-over error is
caused by the reference capacitor losing or gaining charge
due to stray capacitance on its nodes. The difference in
reference for (+) or (–) input voltages will cause a roll-over
error. This error can be minimized by using a large reference
capacitor in comparison to the stray capacitance.
REF
, V
–
REF
)
Phase Control Inputs
(A, B)
The A, B unlatched logic inputs select the TC5xx oper-
ating phase. The A, B inputs are normally driven by a
microprocessor I/O port or external logic.
Table 1. Internal Analog Gate Status
Internal Analog Gate Status
Conversion Phase
SW
I
SW
+
RI
SW
–
RI
SW
Z
SW
R
SW
1
SW
IZ
Auto-Zero (A = 0, B = 1)
Input Signal Integration
(A = 1, B = 0)
Reference Voltage
Deintegration (A =1, B= 1)
Integrator Output Zero
(A = 0, B = 0)
*Assumes a positive polarity input signal. SW
–I
would be closed for a negative input signal.
Closed
Closed
Closed
Closed
Closed*
Closed
Closed
Closed
Closed
PRECISION ANALOG FRONT ENDS
TC500
TC500A
TC510
TC514
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| TC500 | Precision Analog Front Ends |
| TC500A | Precision Analog Front Ends |
| TC500ACPE | Precision Analog Front Ends |
| TC514COI | Precision Analog Front Ends |
| TC500CPE | PRECISION ANALOG FRONT ENDS |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| TC510COG | 制造商:Microchip Technology Inc 功能描述:IC ANALOG FRONT END 17BIT 24SOIC 制造商:Microchip Technology Inc 功能描述:IC, ANALOG FRONT END, 17BIT, 24SOIC |
| TC510COG713 | 功能描述:電信線路管理 IC Prec Analog Frnt End RoHS:否 制造商:STMicroelectronics 產(chǎn)品:PHY 接口類型:UART 電源電壓-最大:18 V 電源電壓-最小:8 V 電源電流:30 mA 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VFQFPN-48 封裝:Tray |
| TC510COI | 制造商:MICROCHIP 制造商全稱:Microchip Technology 功能描述:Precision Analog Front Ends with Dual Slope ADC |
| TC510COI713 | 制造商:MICROCHIP 制造商全稱:Microchip Technology 功能描述:Precision Analog Front Ends with Dual Slope ADC |
| TC510COIOI713 | 制造商:MICROCHIP 制造商全稱:Microchip Technology 功能描述:Precision Analog Front Ends |
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