參數(shù)資料
型號(hào)： AD7922AUJ-REEL7
廠商： ANALOG DEVICES INC
元件分類(lèi)： ADC
英文描述： Circular Connector; No. of Contacts:7; Series:; Body Material:Aluminum Alloy; Connecting Termination:Solder; Connector Shell Size:16S; Circular Contact Gender:Socket; Circular Shell Style:Wall Mount Receptacle
中文描述： 2-CH 12-BIT SUCCESSIVE APPROXIMATION ADC, SERIAL ACCESS, PDSO8
封裝： MO-193BA, TSOT-8
文件頁(yè)數(shù)： 15/32頁(yè)
文件大?。?/td> 386K
代理商： AD7922AUJ-REEL7
AD7912/AD7922
CIRCUIT INFORMATION
The AD7912/AD7922 are fast, 2-channel, 10-/12-bit, single
supply, analog-to-digital converters (ADCs), respectively. The
parts can be operated from a 2.35 V to 5.25 V supply. When
operated from either a 5 V supply or a 3 V supply, the
AD7912/AD7922 are capable of throughput rates of 1 MSPS
when provided with an 18 MHz clock.
Rev. 0 | Page 15 of 32
The AD7912/AD7922 provide the user with an on-chip track-
and-hold, an ADC, and a serial interface, all housed in a tiny
8-lead TSOT package or 8-lead MSOP package, which offer the
user considerable space-saving advantages over alternative
solutions. The serial clock input accesses data from the parts,
controls the transfer of data written to the ADC, and provides
the clock source for the successive approximation ADC. The
analog input range is 0 to V
DD
. An external reference is not
required for the ADC, and neither is there a reference on-chip.
The reference for the AD7912/AD7922 is derived from the
power supply and, therefore, gives the widest dynamic input
range.
The AD7912/AD7922 feature a power-down option that allows
power saving between conversions. The power-down feature is
implemented across the standard serial interface as described in
the Modes of Operation section. The AD7912/AD7922 can also
be used in daisy-chain mode when several AD7912/AD7922 are
connected in a daisy chain. This mode of operation is selected
by controlling the logic state of the CS signal. The fourth MSB
on the DOUT pin indicates if the ADC is in normal mode or
daisy-chain mode.
CONVERTER OPERATION
The AD7912/AD7922 are 10-/12-bit successive approximation
ADCs based around a charge redistribution DAC. Figure 19 and
Figure 20 show simplified schematics of the ADC. Figure 19
shows the ADC during its acquisition phase. SW2 is closed and
SW1 is in Position A, the comparator is held in a balanced
condition, and the sampling capacitor acquires the signal on the
selected V
IN
channel.
0
COMPARATOR
ACPHASE
V
DD
/2
SW2
SW1
V
IN0
V
IN1
SAMPLING
AGND
A
B
RECDAC
CONTROL
LOGIC
Figure 19. ADC Acquisition Phase
When the ADC starts a conversion (see Figure 20), SW2 opens
and SW1 moves to Position B, causing the comparator to
become unbalanced. The control logic and the charge redistri-
bution DAC are used to add and subtract fixed amounts of
charge from the sampling capacitor to bring the comparator
back into a balanced condition. When the comparator is
rebalanced, the conversion is complete. The control logic
generates the ADC output code. Figure 21 shows the ADC
transfer function.
0
COMPARATOR
CONVERSION
PHASE
V
DD
/2
SW2
SW1
V
IN0
V
IN1
SAMPLING
CAPACITOR
AGND
A
B
CHARGE
REDISTRIBUTION
DAC
CONTROL
LOGIC
Figure 20. ADC Conversion Phase
ADC TRANSFER FUNCTION
The output coding of the AD7912/AD7922 is straight binary.
The designed code transitions occur at the successive integer
LSB values, that is, 1 LSB, 2 LSBs, and so on. The LSB size is
V
DD
/4096 for the AD7922 and V
DD
/1024 for the AD7912. The
ideal transfer characteristic for the AD7912/AD7922 is shown
in Figure 21.
0
000...000
0V
A
ANALOG INPUT
111...111
111...110
000...001
111...000
011...111
000...010
1LSB = V
REF
/4096 (AD7922)
1LSB = V
REF
/1024 (AD7912)
+V
DD
– 1LSB
1LSB
Figure 21. AD7912/AD7922 Transfer Characteristic
相關(guān)PDF資料
PDF描述
AD7912AUJ-REEL7 Circular Connector; No. of Contacts:5; Series:; Body Material:Aluminum Alloy; Connecting Termination:Solder; Connector Shell Size:16S; Circular Contact Gender:Pin; Circular Shell Style:Wall Mount Receptacle; Insert Arrangement:16S-8 RoHS Compliant: No
AD7912 2-Channel, 2.35 V to 5.25 V, 1 MSPS, 10-/12-Bit ADCs
AD7912ARM 2-Channel, 2.35 V to 5.25 V, 1 MSPS, 10-/12-Bit ADCs
AD7912ARM-REEL 2-Channel, 2.35 V to 5.25 V, 1 MSPS, 10-/12-Bit ADCs
AD7912ARM-REEL7 2-Channel, 2.35 V to 5.25 V, 1 MSPS, 10-/12-Bit ADCs
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
AD7922AUJZ-REEL7 功能描述:IC ADC DUAL 12BIT 2CH TSOT-23-8 RoHS:是 類(lèi)別:集成電路 (IC) >> 數(shù)據(jù)采集 - 模數(shù)轉(zhuǎn)換器 系列:- 其它有關(guān)文件:TSA1204 View All Specifications 標(biāo)準(zhǔn)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(zhuǎn)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(lèi)型:表面貼裝 封裝/外殼:48-TQFP 供應(yīng)商設(shè)備封裝:48-TQFP（7x7） 包裝:Digi-Reel® 輸入數(shù)目和類(lèi)型:4 個(gè)單端，單極；2 個(gè)差分，單極 產(chǎn)品目錄頁(yè)面:1156 (CN2011-ZH PDF) 其它名稱(chēng):497-5435-6
AD7923 制造商:AD 制造商全稱(chēng):Analog Devices 功能描述:4-Channel, 200 kSPS, 12-Bit ADC with Sequencer in 16-Lead TSSOP
AD7923_11 制造商:AD 制造商全稱(chēng):Analog Devices 功能描述:4-Channel, 200 kSPS 12-Bit ADC with Sequencer in 16-Lead TSSOP
AD7923BRU 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 4CH 200 kSPS 12-Bit W/ Sequencer RoHS:否 制造商:Analog Devices 通道數(shù)量: 結(jié)構(gòu): 轉(zhuǎn)換速率: 分辨率: 輸入類(lèi)型: 信噪比: 接口類(lèi)型: 工作電源電壓: 最大工作溫度: 安裝風(fēng)格: 封裝 / 箱體:
AD7923BRU-REEL 制造商:Analog Devices 功能描述:ADC Single SAR 200ksps 12-bit Serial 16-Pin TSSOP T/R 制造商:Analog Devices 功能描述:ADC SGL SAR 200KSPS 12-BIT SERL 16TSSOP - Tape and Reel
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