參數(shù)資料
型號： AD7706BRU
廠商： ANALOG DEVICES INC
元件分類： ADC
英文描述： 3 V/5 V, 1 mW 2-/3-Channel 16-Bit, Sigma-Delta ADCs
中文描述： 3-CH 16-BIT DELTA-SIGMA ADC, SERIAL ACCESS, PDSO16
封裝： MO-153AB, TSSOP-16
文件頁數(shù)： 31/32頁
文件大?。?/td> 264K
代理商： AD7706BRU
AD7705/AD7706
–31–
REV. A
Battery Monitoring
Another area where the low power, single supply operation is a
requirement is battery monitoring in portable equipment appli-
cations. Figure 26 shows a block diagram of a battery monitor
that includes the AD7705 and an external multiplexer used to
differentially measure the voltage across a single cell. The sec-
ond channel on the AD7705 is used to monitor current drain
from the battery. The AD7705 with its dual input channel is
ideally suited to measurement systems requiring two input chan-
nels, as in this case, to monitor voltage and current. Since the
AD7705 can accommodate very low input signals the R
SENSE
VCELL 1
R
SENSE
AIN1(+)
AIN1(–)
AIN2(+)
AIN2(–)
REF IN(–)
AD7705
V
DD
REF IN(+)
1.225V
REF
VOLTAGE
REGULATORS
VCELL 2
VCELL 3
VCELL 4
VDIFF1
VDIFF2
VDIFF3
VDIFF4
DC BATTERY
CHARGING
SOURCE
LOAD
ON/OFF SWITCH
+5V
+3V
GND
4-TO-1
DIFFERENTIAL
MULTIPLEXER
Figure 26. Battery Monitoring Using the AD7705
can be kept low reducing undesired power dissipation. Operat-
ing with a gain of 128, a
±
9.57 mV full-scale signal can be
measured with a resolution of 2
μ
V, giving 13.5 bits of flicker-
free performance in such a system. In order to obtain specified
performance in unbuffered mode, the common mode range of
the input is from GND to V
DD
provided that the absolute value
of the analog input voltage lies between GND – 30mV and
V
DD
+30mV. Absolute voltages of GND – 200 mV can be
accommodated on the AD7705 at 25
°
C without any degrada-
tion in performance, but leakage current increases significantly
at elevated temperatures.
相關(guān)PDF資料
PDF描述
AD7705EB Precision Zero-Drift Operational Amplifier with Internal Capacitors; Package: SO; No of Pins: 8; Temperature Range: 0°C to +70°C
AD7706* 3 V/5 V. 1 mW 2-/3-Channel 16-Bit. Sigma-Delta ADCs
AD7706EB High Performance Switched Capacitor Universal Filter; Package: PDIP; No of Pins: 14; Temperature Range: 0°C to +70°C
AD7706(中文) 3 V/5 V, 1 Mw 2-/3-Channel 16-Bit, Sigma-Delta ADCs(三輸入通道16位A/D轉(zhuǎn)換器)
AD7705(中文) 3 V/5 V, 1 Mw 2-/3-Channel 16-Bit, Sigma-Delta ADCs(完全差分輸入通道16位A/D轉(zhuǎn)換器)
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