參數(shù)資料
型號： AD7870BQ
廠商： Analog Devices Inc
文件頁數(shù)： 3/28頁
文件大?。?/td> 0K
描述： IC ADC 12BIT SAMPLING 3V 24-CDIP
產(chǎn)品變化通告： Conversion Time Change
標準包裝： 1
位數(shù)： 12
采樣率（每秒）： 100k
數(shù)據(jù)接口： 串行，并聯(lián)
轉換器數(shù)目： 1
功率耗散（最大）： 95mW
電壓電源： 雙 ±
工作溫度： -25°C ~ 85°C
安裝類型： 通孔
封裝/外殼： 24-CDIP（0.300"，7.62mm）
供應商設備封裝： 24-CDIP
包裝： 管件
輸入數(shù)目和類型： 1 個單端，雙極
AD7870/AD7875/AD7876
Rev. C | Page 11 of
28
CONVERTER DETAILS
The AD7870/AD7875/AD7876 is a complete 12-bit ADC,
requiring no external components apart from power supply
decoupling capacitors. It is comprised of a 12-bit successive
approximation ADC based on a fast settling voltage output
DAC, a high speed comparator and SAR, a track-and-hold
amplifier, a 3 V buried Zener reference, a clock oscillator,
and control logic.
INTERNAL REFERENCE
The AD7870/AD7875/AD7876 have on-chip temperature
compensated buried Zener reference that is factory trimmed
to 3 V ± 10 mV. Internally it provides both the DAC reference
and the dc bias required for bipolar operation (AD7870 and
AD7876). The reference output is available (REF OUT) and
capable of providing up to 500 μA to an external load.
The maximum recommended capacitance on REF OUT for
normal operation is 50 pF. If the reference is required for use
external to the ADC, it should be decoupled with a 200 Ω
resistor in series with a parallel combination of a 10 μF
tantalum capacitor and a 0.1 μF ceramic capacitor. These
decoupling components are required to remove voltage
spikes caused by the ADC’s internal operation.
TEMPERATURE
COMPENSATION
AD7870/AD7875/AD7876
REF OUT
VSS
VDD
07
73
0-
00
6
Figure 6. Reference Circuit
The reference output voltage is 3 V. For applications using the
AD7875 or AD7876, a 5 V or 10 V reference may be required.
Figure 7 shows how to scale the 3 V REF OUT voltage to
provide either a 5 V or 10 V external reference.
INTERNAL 3V
REFERENCE
AD7870/AD7875/AD7876
REF OUT
15k
(3.9k)
10k
(9.1k)
VOUT = 5V (10V)
07
73
0-
0
07
Figure 7. Generating a 5 V or 10 V Reference
TRACK-AND-HOLD AMPLIFIER
The track-and-hold amplifier on the analog input of the
AD7870/AD7875/AD7876 allows the ADC to accurately
convert input frequencies to 12-bit accuracy. The input
bandwidth of the track-and-hold amplifier is much greater
than the Nyquist rate of the ADC even when the ADC is
operated at its maximum throughput rate. The 0.1 dB cutoff
frequency occurs typically at 500 kHz. The track-and-hold
amplifier acquires an input signal to 12-bit accuracy in less than
2 μs. The overall throughput rate is equal to the conversion time
plus the track-and-hold amplifier acquisition time. For a 2.5 MHz
input clock the throughput rate is 10 μs max.
The operation of the track-and-hold is essentially transparent
to the user. The track-and-hold amplifier goes from its tracking
mode to its hold mode at the start of conversion.
If the CONVST input is used to start conversion then the track
to hold transition occurs on the rising edge of CONVST. If CS
starts conversion, this transition occurs on the falling edge of CS.
ANALOG INPUT
The three parts differ from each other in the analog input
voltage range that they can handle. The AD7870 accepts ±3 V
input signals, the AD7876 accepts a ±10 V input range, while
the input range for the AD7875 is 0 V to +5 V.
Figure 8 shows the AD7870 analog input. The analog input
range is ±3 V into an input resistance of typically 15 kΩ. The
designed code transitions occur midway between successive
integer LSB values (that is, 1/2 LSB, 3/2 LSBs, 5/2 LSBs . . .
FS–3/2 LSBs). The output code is twos complement binary with
1 LSB = FS/4096 = 6 V/4096 = 1.46 mV. The ideal input/output
transfer function is shown in Figure 11.
AD7870
TRACK-AND-HOLD
AMPLIFIER
TO INTERNAL
3V REFERENCE
R
TO INTERNAL
COMPARATOR
07
73
0-
00
8
Figure 8. AD7970 Analog Input
The AD7876 analog input structure is shown in Figure 9. The
analog input range is ±10 V into an input resistance of typically
33 kΩ. As before, the designed code transitions occur midway
between successive integer LSB values. The output code is twos
complement with 1 LSB = FS/4096 = 20 V/4096 = 4.88 mV. The
ideal input/output transfer function is shown in Figure 11.
相關PDF資料
PDF描述
MS3108E20-27P CONN PLUG 14POS RT ANG W/PINS
IDT72V235L10PFG IC FIFO SYNC 2048X18 10NS 64TQFP
AD7572BQ12 IC ADC 12BIT HS LC2MOS 24-CDIP
AD7871JN IC ADC 14BIT SAMPLING 28-DIP
AD674BBR IC ADC 12BIT MONO 3OUT 28-SOIC
相關代理商/技術參數(shù)
參數(shù)描述
AD7870CQ 功能描述:IC ADC 12BIT SAMPLING 3V 24-CDIP RoHS:否 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - 模數(shù)轉換器 系列:- 產(chǎn)品培訓模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝:250 系列:- 位數(shù):12 采樣率（每秒）:1.8M 數(shù)據(jù)接口:并聯(lián) 轉換器數(shù)目:1 功率耗散（最大）:1.82W 電壓電源:模擬和數(shù)字 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:48-LQFP 供應商設備封裝:48-LQFP（7x7） 包裝:管件 輸入數(shù)目和類型:2 個單端，單極
AD7870JN 功能描述:IC ADC 12BIT LC2MOS 100KHZ 24DIP RoHS:否 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - 模數(shù)轉換器 系列:- 產(chǎn)品培訓模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝:2,500 系列:- 位數(shù):12 采樣率（每秒）:3M 數(shù)據(jù)接口:- 轉換器數(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 供應商設備封裝:SOT-23-6 包裝:帶卷 (TR) 輸入數(shù)目和類型:-
AD7870JNZ 功能描述:IC ADC 12BIT LC2MOS 100KHZ 24DIP RoHS:是 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - 模數(shù)轉換器 系列:- 其它有關文件:TSA1204 View All Specifications 標準包裝:1 系列:- 位數(shù):12 采樣率（每秒）:20M 數(shù)據(jù)接口:并聯(lián) 轉換器數(shù)目:2 功率耗散（最大）:155mW 電壓電源:模擬和數(shù)字 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:48-TQFP 供應商設備封裝:48-TQFP（7x7） 包裝:Digi-Reel® 輸入數(shù)目和類型:4 個單端，單極；2 個差分，單極 產(chǎn)品目錄頁面:1156 (CN2011-ZH PDF) 其它名稱:497-5435-6
AD7870JNZ1 制造商:AD 制造商全稱:Analog Devices 功能描述:LC2MOS Complete, 12-Bit, 100 kHz, Sampling ADCs
AD7870JP 功能描述:IC ADC 12BIT SAMPLING 3V 28-PLCC RoHS:否 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - 模數(shù)轉換器 系列:- 標準包裝:1 系列:- 位數(shù):14 采樣率（每秒）:83k 數(shù)據(jù)接口:串行，并聯(lián) 轉換器數(shù)目:1 功率耗散（最大）:95mW 電壓電源:雙 ± 工作溫度:0°C ~ 70°C 安裝類型:通孔 封裝/外殼:28-DIP（0.600"，15.24mm） 供應商設備封裝:28-PDIP 包裝:管件 輸入數(shù)目和類型:1 個單端，雙極
發(fā)布緊急采購，3分鐘左右您將得到回復。

采購需求

(若只采購一條型號，填寫一行即可)

發(fā)布成功！您可以繼續(xù)發(fā)布采購。也可以進入我的后臺，查看報價

發(fā)布成功！您可以繼續(xù)發(fā)布采購。也可以進入我的后臺，查看報價

*型號 *數(shù)量 廠商 批號 封裝
添加更多采購

我的聯(lián)系方式

*
*
*