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| 型号： | 71M6511-IGTR/F |
| 厂商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分类： | 电源管理 |
| 英文描述： | 1-CHANNEL POWER SUPPLY MANAGEMENT CKT, PQFP64 |
| 封装： | LEAD FREE, LQFP-64 |
| 文件页数： | 2/98页 |
| 文件大小： | 1278K |
| 代理商： | 71M6511-IGTR/F |
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71M6511/71M6511H
Single-Phase Energy Meter IC
DATA SHEET
NOVEMBER 2010
Page: 10 of 98
2005–2010 Teridian Semiconductor Corporation
V2.7
A Maxim Integrated Products Brand
G
-
+
V
inp
V
outp
V
outn
V
inn
CROSS
A
B
A
B
A
B
A
B
Figure 2: General Topology of a Chopped Amplifier
It is assumed that an offset voltage Voff appears at the positive amplifier input. With all switches, as controlled by CROSS in
the “A” position, the output voltage is:
Voutp – Voutn = G (Vinp + Voff – Vinn) = G (Vinp – Vinn) + G Voff
With all switches set to the “B” position by applying the inverted CROSS signal, the output voltage is:
Voutn – Voutp = G (Vinn – Vinp + Voff) = G (Vinn – Vinp) + G Voff, or
Voutp – Voutn = G (Vinp – Vinn) - G Voff
Thus, when CROSS is toggled, e.g. after each multiplexer cycle, the offset will alternately appear on the output as positive and
negative, which results in the offset effectively being eliminated, regardless of its polarity or magnitude.
The Functional Description Section contains a chapter with a detailed description on controlling the CHOP_ENA register.
Temperature Sensor
The 71M6511/6511H includes an on-chip temperature sensor implemented as a bandgap reference. It is used to determine
the die temperature The MPU may request an alternate multiplexer cycle containing the temperature sensor output by
asserting MUX_ALT.
The primary use of the temperature data is to determine the magnitude of compensation required to offset the thermal drift in
the system (see section titled “Temperature Compensation”).
The zero reference for the temperature sensor is VBIAS.
Functional Description
The AFE functions as a data acquisition system, controlled by the MPU. The main signals (IA, VA, IB) are sampled and the
ADC counts obtained are stored in CE RAM where they can be accessed by the CE and, if necessary, by the MPU. Alternate
multiplexer cycles are initiated less frequently by the MPU to gather access to the slow temperature signal.
IA
VA
IB
MUX
VREF
VBIAS
TEMP
CK32
VREF
VREF_DIS
MUX
CTRL
MUX_DIV
CHOP_EN
EQU
MUX
MUX_ALT
V3P3A
FIR_LEN
FIR
FILTER
Σ ADC
CONVERTER
+
-
VREF
相关PDF资料 |
PDF描述 |
|---|---|
| 71M6511-IGT/F | 1-CHANNEL POWER SUPPLY MANAGEMENT CKT, PQFP64 |
| 71M6511-IGT | 1-CHANNEL POWER SUPPLY MANAGEMENT CKT, PQFP64 |
| 71M6511-IGTR | 1-CHANNEL POWER SUPPLY MANAGEMENT CKT, PQFP64 |
| 71M6511H-IGTR/F | 1-CHANNEL POWER SUPPLY MANAGEMENT CKT, PQFP64 |
| 71M6511H-IGT/F | 1-CHANNEL POWER SUPPLY MANAGEMENT CKT, PQFP64 |
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