- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄10685 > AD7321BRUZ (Analog Devices Inc)IC ADC 12BIT+ SAR 2CHAN 14TSSOP PDF資料下載
參數(shù)資料
| 型號(hào)： | AD7321BRUZ |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 11/37頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC ADC 12BIT+ SAR 2CHAN 14TSSOP |
| 標(biāo)準(zhǔn)包裝： | 96 |
| 位數(shù)： | 12 |
| 采樣率（每秒）： | 500k |
| 數(shù)據(jù)接口： | DSP，MICROWIRE?，QSPI?，串行，SPI? |
| 轉(zhuǎn)換器數(shù)目： | 1 |
| 功率耗散（最大）： | 17mW |
| 電壓電源： | 雙 ± |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 14-TSSOP（0.173"，4.40mm 寬） |
| 供應(yīng)商設(shè)備封裝： | 14-TSSOP |
| 包裝： | 管件 |
| 輸入數(shù)目和類型： | 2 個(gè)單端，單極；2 個(gè)單端，雙極；1 個(gè)差分，單極；1 個(gè)差分，雙極 |
| 產(chǎn)品目錄頁面： | 777 (CN2011-ZH PDF) |
| 配用： | EVAL-AD7321CBZ-ND - BOARD EVALUATION FOR AD7321 |
第1頁第2頁第3頁第4頁第5頁第6頁第7頁第8頁第9頁第10頁當(dāng)前第11頁第12頁第13頁第14頁第15頁第16頁第17頁第18頁第19頁第20頁第21頁第22頁第23頁第24頁第25頁第26頁第27頁第28頁第29頁第30頁第31頁第32頁第33頁第34頁第35頁第36頁第37頁
AD7321
Data Sheet
Rev. B | Page 18 of 36
D
VDD
C2
R1
VIN+
VSS
C1
D
VDD
C2
R1
VIN–
VSS
C1
05399-
024
Figure 30. Equivalent Analog Input Circuit (Differential)
Care should be taken to ensure that the analog input does not
exceed the VDD and VSS supply rails by more than 300 mV.
Exceeding this value causes the diodes to become forward
biased and to start conducting into either the VDD supply rail or
VSS supply rail. These diodes can conduct up to 10 mA without
causing irreversible damage to the part.
In Figure 29 and Figure 30, Capacitor C1 is typically 4 pF and
can primarily be attributed to pin capacitance. Resistor R1 is a
lumped component made up of the on resistance of the input
multiplexer and the track-and-hold switch. Capacitor C2 is the
sampling capacitor; its capacitance varies depending on the
analog input range selected (see the Specifications section).
Track-and-Hold Section
The track-and-hold on the analog input of the AD7321 allows
the ADC to accurately convert an input sine wave of full-scale
amplitude to 13-bit accuracy. The input bandwidth of the track-
and-hold is greater than the Nyquist rate of the ADC. The
AD7321 can handle frequencies up to 22 MHz.
The track-and-hold enters its tracking mode on the 14th SCLK
rising edge after the CS falling edge. The time required to
acquire an input signal depends on how quickly the sampling
capacitor is charged. With 0 source impedance, 305 ns is
sufficient to acquire the signal to the 13-bit level. The
acquisition time required is calculated using the following
formula:
tACQ = 10 × ((RSOURCE + R) C)
where C is the sampling capacitance and R is the resistance seen
by the track-and-hold amplifier looking back on the input. For
the AD7321, the value of R includes the on resistance of the
input multiplexer and is typically 300 . RSOURCE should include
any extra source impedance on the analog input.
When running the AD7321 at a throughput rate of 500 kSPS
with a 10 MHz SCLK signal, the ADC has approximately
1.5 SCLK + t8 + tQUIET
to acquire the analog input signal. The ADC goes back into
hold mode on the CS falling edge.
As the VDD/VSS supply voltage is reduced, the on resistance of
the input multiplexer increases. Therefore, based on the
equation for tACQ, it is necessary to increase the amount of
acquisition time provided to the AD7321, and hence decrease
VSS supplies are reduced, the specified THD performance
degrades slightly. If the throughput rate is reduced when
operating with the minimum VDD and VSS supplies, the specified
THD performance is maintained.
5
19
±VDD/VSS SUPPLIES (V)
T
HD
(
d
B)
7
9
11
13
15
17
05399-
051
–95
–75
–80
–85
–90
500kSPS
VCC = VDRIVE = 5V
INTERNAL REFERENCE
TA = 25°C
FIN = 10kHz
±5V RANGE
SE MODE
Figure 31. THD vs. ±VDD/VSS Supply Voltage at 500 kSPS
Unlike other bipolar ADCs, the AD7321 does not have a
resistive analog input structure. On the AD7321, the bipolar
analog signal is sampled directly onto the sampling capacitor.
This gives the AD7321 high analog input impedance. An
approximation for the analog input impedance is calculated
from the following formula:
Z = 1/(fS × CS)
where fS is the sampling frequency, and CS is the sampling
capacitor value.
CS depends on the analog input range chosen (see the
Specifications section). When operating at 500 kSPS, the analog
input impedance is typically 145 kΩ for the ±10 V range. As the
sampling frequency is reduced, the analog input impedance
further increases. As the analog input impedance increases, the
current required to drive the analog input therefore decreases.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| AD7914BRUZ | IC ADC 10BIT 4CH 1MSPS 16TSSOP |
| AD7992BRMZ-1 | IC ADC 12BIT 2CHAN I2C 10-MSOP |
| LTC1443IS#TR | IC COMP QUAD LP 1.182VREF 16SOIC |
| LTC1444IS#TRPBF | IC COMP W/REF LOWPWR QUAD 16SOIC |
| LTC1401CS8#PBF | IC A/D CONV 12BIT W/SHTDN 8-SOIC |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AD7321BRUZ-REEL | 功能描述:IC ADC 12BIT+SAR 2CHAN 14-TSSOP RoHS:是 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - 模數(shù)轉(zhuǎn)換器 系列:- 標(biāo)準(zhǔn)包裝:2,500 系列:- 位數(shù):16 采樣率（每秒）:15 數(shù)據(jù)接口:MICROWIRE?，串行，SPI? 轉(zhuǎn)換器數(shù)目:1 功率耗散（最大）:480µW 電壓電源:單電源 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:38-WFQFN 裸露焊盤 供應(yīng)商設(shè)備封裝:38-QFN（5x7） 包裝:帶卷 (TR) 輸入數(shù)目和類型:16 個(gè)單端，雙極；8 個(gè)差分，雙極 配用:DC1011A-C-ND - BOARD DELTA SIGMA ADC LTC2494 |
| AD7321BRUZ-REEL7 | 功能描述:IC ADC 12BIT+ SAR 2CHAN 14TSSOP RoHS:是 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - 模數(shù)轉(zhuǎn)換器 系列:- 標(biāo)準(zhǔn)包裝:2,500 系列:- 位數(shù):16 采樣率（每秒）:15 數(shù)據(jù)接口:MICROWIRE?，串行，SPI? 轉(zhuǎn)換器數(shù)目:1 功率耗散（最大）:480µW 電壓電源:單電源 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:38-WFQFN 裸露焊盤 供應(yīng)商設(shè)備封裝:38-QFN（5x7） 包裝:帶卷 (TR) 輸入數(shù)目和類型:16 個(gè)單端，雙極；8 個(gè)差分，雙極 配用:DC1011A-C-ND - BOARD DELTA SIGMA ADC LTC2494 |
| AD7322 | 制造商:ATMEL 制造商全稱:ATMEL Corporation 功能描述:Software Selectable True Bipolar Input, 2-Channel, 12-Bit Plus Sign ADC |
| AD7322BRU | 制造商:ATMEL 制造商全稱:ATMEL Corporation 功能描述:Software Selectable True Bipolar Input, 2-Channel, 12-Bit Plus Sign ADC |
| AD7322BRUZ | 功能描述:IC ADC 12BIT+ SAR 2CHAN 14TSSOP RoHS:是 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - 模數(shù)轉(zhuǎn)換器 系列:- 標(biāo)準(zhǔn)包裝:1 系列:microPOWER™ 位數(shù):8 采樣率（每秒）:1M 數(shù)據(jù)接口:串行，SPI? 轉(zhuǎn)換器數(shù)目:1 功率耗散（最大）:- 電壓電源:模擬和數(shù)字 工作溫度:-40°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:24-VFQFN 裸露焊盤 供應(yīng)商設(shè)備封裝:24-VQFN 裸露焊盤（4x4） 包裝:Digi-Reel® 輸入數(shù)目和類型:8 個(gè)單端，單極 產(chǎn)品目錄頁面:892 (CN2011-ZH PDF) 其它名稱:296-25851-6 |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。