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| 型號： | AD7655ACPZRL |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 9/28頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC ADC 16BIT 4CHAN 48LFCSP |
| 標(biāo)準(zhǔn)包裝： | 2,500 |
| 系列： | PulSAR® |
| 位數(shù)： | 16 |
| 采樣率（每秒）： | 1M |
| 數(shù)據(jù)接口： | 串行，并聯(lián) |
| 轉(zhuǎn)換器數(shù)目： | 1 |
| 功率耗散（最大）： | 135mW |
| 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-VFQFN 裸露焊盤，CSP |
| 供應(yīng)商設(shè)備封裝： | 48-LFCSP-VQ（7x7） |
| 包裝： | 帶卷 (TR) |
| 輸入數(shù)目和類型： | 2 個差分，單極 |
| 配用： | EVAL-AD7655CBZ-ND - BOARD EVALUATION FOR AD7655 |
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AD7655
Rev. B | Page 17 of 28
Table 8. Recommended Driver Amplifiers
Amplifier
Typical Application
ADA4841
Very low noise, low distortion, low power,
low frequency
AD829
Very low noise, low frequency
AD8021
Very low noise, high frequency
AD8022
Very low noise, high frequency, dual
AD8605/AD8606/
AD8608/AD8615/
AD8616/ AD8618
5 V single supply, low power,
low frequency, single/dual/quad
AD8610/AD8620
Low bias current, low frequency,
single/dual
VOLTAGE REFERENCE INPUT
The AD7655 requires an external 2.5 V reference. The reference
input should be applied to REF, REFA, and REFB. The voltage
reference input REF of the AD7655 has a dynamic input
impedance; it should therefore be driven by a low impedance
source with an efficient decoupling. This decoupling depends
on the choice of the voltage reference but usually consists of a
1 μF ceramic capacitor and a low ESR tantalum capacitor
connected to the REFA, REFB, and REFGND inputs with
minimum parasitic inductance. A value of 47 μF is appropriate
for the tantalum capacitor when using one of the recommended
reference voltages:
The low noise, low temperature drift AD780, ADR421,
and ADR431 voltage references
The low cost AD1582 voltage reference
For applications using multiple AD7655s with one voltage
reference source, it is recommended that the reference source
drives each ADC in a star configuration with individual
decoupling placed as close as possible to the REF/REFGND
inputs. Also, it is recommended that a buffer, such as the
AD8031/AD8032, be used in this configuration.
Care should be taken with the reference temperature coefficient
of the voltage reference, which directly affects the full-scale
accuracy if this parameter is applicable. For instance, a
15 ppm/°C tempco of the reference changes the full-scale
accuracy by 1 LSB/°C.
POWER SUPPLY
The AD7655 uses three sets of power supply pins: an analog
5 V supply AVDD, a digital 5 V core supply DVDD, and a
digital input/output interface supply OVDD. The OVDD
supply allows direct interface with any logic working between
2.7 V and DVDD + 0.3 V. To reduce the number of supplies
needed, the digital core (DVDD) can be supplied through a
simple RC filter from the analog supply, as shown in Figure 17.
The AD7655 is independent of power supply sequencing, once
OVDD does not exceed DVDD by more than 0.3 V, and thus is
free from supply voltage induced latch-up. Additionally, it is
very insensitive to power supply variations over a wide
frequency range, as shown in Figure 19.
FREQUENCY (kHz)
40
P
S
RR
(dB)
100
1000
10000
45
50
55
60
65
70
10
1
03536-019
Figure 19. PSRR vs. Frequency
POWER DISSIPATION
In impulse mode, the AD7655 automatically reduces its power
consumption at the end of each conversion phase. During the
acquisition phase, the operating currents are very low, which
allows significant power savings when the conversion rate is
reduced, as shown in Figure 20. This feature makes the AD7655
ideal for very low power battery applications.
Note that the digital interface remains active even during the
acquisition phase. To reduce the operating digital supply
currents even further, the digital inputs need to be driven close
to the power rails (that is, DVDD and DGND), and OVDD
should not exceed DVDD by more than 0.3 V.
SAMPLING RATE (kSPS)
0.1
POW
E
R
D
ISSIPA
TION
(
m
W
)
100
1000
1
10
100
1000
NORMAL
IMPULSE
03536-020
10
1
Figure 20. Power Dissipation vs. Sample Rate
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相關(guān)代理商/技術(shù)參數(shù) |
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| AD7655AST | 制造商:Analog Devices 功能描述:ADC Single SAR 1Msps 16-bit Parallel/Serial 48-Pin LQFP 制造商:Analog Devices 功能描述:IC 16BIT ADC SMD 7655 LQFP48 |
| AD7655ASTRL | 制造商:Analog Devices 功能描述:ADC Single SAR 1Msps 16-bit Parallel/Serial 48-Pin LQFP T/R |
| AD7655ASTZ | 功能描述:IC ADC 16BIT 1MSPS QUAD 48-LQFP RoHS:是 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - 模數(shù)轉(zhuǎn)換器 系列:PulSAR® 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 個單端，單極 產(chǎn)品目錄頁面:892 (CN2011-ZH PDF) 其它名稱:296-25851-6 |
| AD7655ASTZ | 制造商:Analog Devices 功能描述:CONVERTER A/D ((NW)) |
| AD7655ASTZRL | 功能描述:IC ADC 16BIT 4CHAN 48LQFP RoHS:是 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - 模數(shù)轉(zhuǎn)換器 系列:PulSAR® 標(biāo)準(zhǔn)包裝:1,000 系列:- 位數(shù):12 采樣率（每秒）:300k 數(shù)據(jù)接口:并聯(lián) 轉(zhuǎn)換器數(shù)目:1 功率耗散（最大）:75mW 電壓電源:單電源 工作溫度:0°C ~ 70°C 安裝類型:表面貼裝 封裝/外殼:24-SOIC（0.295"，7.50mm 寬） 供應(yīng)商設(shè)備封裝:24-SOIC 包裝:帶卷 (TR) 輸入數(shù)目和類型:1 個單端，單極；1 個單端，雙極 |
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