參數資料
型號： EVAL-ADUC7039QSPZ
廠商： Analog Devices Inc
文件頁數： 26/92頁
文件大?。?/td> 0K
描述： BOARD EVAL FOR ADUC7039
設計資源： ADuC7039QSPZ Gerber Files
EVAL-ADuC7039 Schematic & Brd Outline
標準包裝： 1
系列： QuickStart™ PLUS 套件
類型： MCU
適用于相關產品： ADuC7039
所含物品： 板
ADuC7039
Data Sheet
Rev. D | Page 32 of 92
Voltage/Temperature Channel ADC (V/T-ADC)
The voltage/temperature channel ADC (V/T-ADC) converts
additional battery parameters such as voltage and temperature.
The input to this channel can be multiplexed from an external
voltage and an on-chip temperature sensor.
As with the current channel ADC described previously, the
V/T-ADC employs an identical Σ-Δ conversion technique,
including a modified sinc3 low-pass filter to give a valid
16-bit data conversion result at programmable output rates
from 10 Hz to 1 kHz. An external RC filter network is not
required because this is internally implemented in the
voltage channel.
The external battery voltage (VBAT) is routed to the ADC input
via an on-chip, high voltage (divide-by-24), resistive attenuator.
This ADC channel, unlike the current channel, has a fixed input
range of 0 V to 28.8 V on VBAT.
The battery temperature can be derived through the on-chip
temperature sensor.
By default, the time to a first valid (fully settled) result after
an input channel switch on the voltage/temperature channel
is three ADC conversion cycles with chop mode turned off.
A top level overview of the ADC signal chain is shown in
Figure 12. Voltage/Temperature ADC, Top Level Overview
*R = 66k
ADC
RESULT
OUTPUT
FORMAT
CHOP
Σ-Δ ADC
THE Σ-Δ
ARCHITECTURE
ENSURES 16 BITS
NO MISSING CODES.
OUTPUT AVERAGE
AS PART OF THE CHOPPING
IMPLEMENTATION, EACH
DATA-WORD OUTPUT FROM
THE FILTER IS SUMMED AND
AVERAGED WITH ITS
PREDECESSOR.
Σ-Δ MODULATOR
THE MODULATOR PROVIDES A
HIGH FREQUENCY 1-BIT DATA
STREAM (THE OUTPUT OF
WHICH IS ALSO CHOPPED) TO
THE DIGITAL FILTER, THE DUTY
CYCLE OF WHICH REPRESENTS
THE SAMPLED ANALOG INPUT
VOLTAGE.
Σ-Δ ADC
Σ-Δ
MODULATOR
PROGRAMMABLE
DIGITAL FILTER
OUTPUT
AVERAGE
OFFSET
COEFFICIENT
GAIN
COEFFICIENT
PRECISION REFERENCE
THE INTERNAL 5ppm/°C
REFERENCE IS ROUTED TO
THE ADC BY DEFAULT.
BUF
INTERNAL
TEMP
MUX
INTERNAL
REFERENCE
PROGRAMMABLE
DIGITAL FILTER
THE SINC3 FILTER REMOVES
QUANTIZATION NOISE INTRODUCED
BY THE MODULATOR. THE UPDATE
RATE AND BANDWIDTH OF THIS
FILTER ARE PROGRAMMABLE VIA
THE ADC FILTER MMR.
OUTPUT SCALING
THE OUTPUT WORD FROM
THE DIGITAL FILTER IS
SCALED BY THE CALIBRATION
COEFFICIENTS BEFORE BEING
PROVIDED AS THE
CONVERSION RESULT.
VBAT
VTEMP
44R*
2R*
DIFFERENTIAL
ATTENUATOR
DIVIDE-BY-24, INPUT
ATTENUATOR
BUFFER AMPLIFIERS
THE BUFFER AMPLIFIERS
PRESENT A HIGH
IMPEDANCE INPUT STAGE
FOR THE ANALOG INPUT.
REG_AVDD
CHOP
ANALOG INPUT
PROGRAMMABLE CHOPPING
THE INPUTS ARE
ALTERNATELY REVERSED
THROUGH THE CONVERSION
CYCLE.
ANALOG INPUT
DIAGNOSTIC
CURRENT
SOURCES
ADC RESULT
FINAL (16-BIT)
ADC RESULT.
08463-
013
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