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參數(shù)資料
| 型號： | AD7466BRT |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | ADC |
| 英文描述： | 1.8 V, Micro-Power, 8/10/12-Bit ADCs in 6 Lead SOT-23 |
| 中文描述： | 1-CH 12-BIT SUCCESSIVE APPROXIMATION ADC, SERIAL ACCESS, PDSO6 |
| 封裝： | MO-178AB, SOT-23, 6 PIN |
| 文件頁數(shù)： | 7/24頁 |
| 文件大?。?/td> | 327K |
| 代理商： | AD7466BRT |
–15–
REV. PrF
PRELIMINARY TECHNICAL DATA
AD7466/AD7467/AD7468
Figure 7. REF191 as Power Supply to
AD7466/AD7467/AD7468
Analog Input
Figure 8 shows an equivalent circuit of the analog input
structure of the AD7466/AD7467/7468. The two diodes
D1 and D2 provide ESD protection for the analog inputs.
Care must be taken to ensure that the analog input signal
never exceeds the supply rails by more than 300mV. This
will cause these diodes to become forward biased and start
conducting current into the substrate. The capacitor C1 in
Figure 8 is typically about 4pF and can primarily be at-
tributed to pin capacitance. The resistor R1 is a lumped
component made up of the on resistance of a switch. This
resistor is typically about 200
. The capacitor C2 is the
ADC sampling capacitor and has a capacitance of 16pF
typically.
VDD
VIN
GND
+5V
SUPPLY
0.1F
10F
REF191
0.1F
1F
TANT
+2.048V
AD7466/67/68
0V toVDD
INPUT
SDATA
C /P
SCLK
SERIAL
INTERFACE
&6
TBD A
680nF
TYPICAL CONNECTION DIAGRAM
Figure 7 shows a typical connection diagram for the
AD7466/AD7467/AD7468. VREF is taken internally from
VDD and therefore VDD should be well decoupled. This
provides an analog input range of 0V to VDD.
The conversion result consists of four leading zeros
followed by the MSB of the 12-bit, 10-bit or 8-bit result
from the AD7466, AD7467 or AD7468 respectively. See
Serial Interface section.
Alternatively, because the supply current required by the
AD7466/AD7467/AD7468 is so low, a precision reference
can be used as the supply source to the AD7466/AD7467/
AD7468.
The REF19X Series are precision micropower, low
dropout voltage references. For the AD7466/67/68 voltage
range operation, the REF193 for 3V, REF192 for 2.5 V
and REF191 for 2.048V can be used to supply the
required voltage to the ADC - see Figure 7. This configu-
ration is especially useful if the power supply is quite noisy
or if the system supply voltages are at some value other
than 3V or 2.5V
(e.g. 5V).
The REF19x will output a
steady voltage to the AD7466/AD7467/AD7468. If the
low dropout REF191 is used, the current it needs to
supply to the AD7466/AD7467/AD7468 is typically
TBDA. When the ADC is converting at a rate of
100KSPS the REF191 will need to supply a maximum of
150A to the AD7466/AD7467/AD7468. The load
regulation of the REF191 is typically 10 ppm/mA
(REF191, VS= 5V), which results in an error of 1.5 ppm
(3.07
V) for the 150A drawn from it. This corresponds to
a 0.0061 LSB error for the AD7466 with VDD= 2.048V
from the REF191, a 0.0015 LSB error for the AD7467,
and a 0.00038 LSB error for the AD7468. For applica-
tions where power consumption is important, the
Automatic Power down mode of the ADC and the sleep
mode of the REF19x reference should be used to improve
power performance. See Mode of Operation section of the
datasheet.
Reference Tied
AD7466 SNR performance
To VDD
10kHz Input
REF191@2.048V
TBD dB
ADR420
TBD dB
REF192@2.5
TBD dB
AD780
TBD dB
REF43
TBD dB
ADR421
TBD dB
REF193@3V
TBD dB
AD780
TBD dB
ADR423
TBD dB
Table I. AD7466 performance for various
Voltage References IC.
Table I provides some typical performance data with vari-
ous references used as a VDD source with a low frequency
analog input under the same set-up conditions.
VIN
D1
VDD
D2
R1
C2
16PF
C1
4pF
CONVERSION PHASE - SWITCH OPEN
TRACK PHASE - SWITCH CLOSED
Figure 8. Equivalent Analog Input Circuit
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| AD7467BRT | 1.8 V, Micro-Power, 8/10/12-Bit ADCs in 6 Lead SOT-23 |
| AD7468BRT | 1.8 V, Micro-Power, 8/10/12-Bit ADCs in 6 Lead SOT-23 |
| AD7466 | 1.8 V, Micro-Power, 8/10/12-Bit ADCs in 6 Lead SOT-23 |
| AD7467 | 1.8 V, Micro-Power, 8/10/12-Bit ADCs in 6 Lead SOT-23 |
| AD7468 | 1.8 V, Micro-Power, 8/10/12-Bit ADCs in 6 Lead SOT-23 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AD7466BRT-R | 制造商:AD 制造商全稱:Analog Devices 功能描述:1.6 V, Micropower 12-/10-/8-Bit ADCs |
| AD7466BRT-R2 | 功能描述:IC ADC 12BIT 1.6V LP SOT23-6 RoHS:否 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - 模數(shù)轉(zhuǎn)換器 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準包裝:2,500 系列:- 位數(shù):12 采樣率（每秒）:3M 數(shù)據(jù)接口:- 轉(zhuǎn)換器數(shù)目:- 功率耗散（最大）:- 電壓電源:- 工作溫度:- 安裝類型:表面貼裝 封裝/外殼:SOT-23-6 供應(yīng)商設(shè)備封裝:SOT-23-6 包裝:帶卷 (TR) 輸入數(shù)目和類型:- |
| AD7466BRT-REEL | 制造商:Analog Devices 功能描述:ADC Single SAR 200ksps 12-bit Serial 6-Pin SOT-23 T/R |
| AD7466BRT-REEL7 | 制造商:AD 制造商全稱:Analog Devices 功能描述:1.6 V, Micropower 12-/10-/8-Bit ADCs |
| AD7466BRTZ-R | 制造商:AD 制造商全稱:Analog Devices 功能描述:1.6 V, Micropower 12-/10-/8-Bit ADCs |
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