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參數資料
| 型號： | AD7654 |
| 廠商： | Analog Devices, Inc. |
| 元件分類： | 串行ADC |
| 英文描述： | Dual 2-Channel Simultaneous Sampling SAR 500 kSPS 16-Bit ADC |
| 中文描述： | 雙路2通道同步采樣SAR 500 kSPS的16位ADC |
| 文件頁數： | 13/24頁 |
| 文件大小： | 734K |
| 代理商： | AD7654 |
REV. 0
AD7654
–13–
AVDD
REF A/
REF B/
REF
AGND
DGND
DVDD
OVDD
OGND
SER/
PAR
CNVST
BUSY
SDOUT
SCLK
RD
CS
RESET
PD
REFGND
C
REF
2.5V REF
NOTE 1
30
D
CLOCK
AD7654
C/ P/DSP
SERIAL PORT
DIGITAL SUPPLY
(3.3V OR 5V)
ANALOG
SUPPLY
(5V)
DVDD
A/
B
NOTE 7
BYTESWAP
DVDD
50k
100nF
1M
INAx
ANALOG INPUT A
C
C
2.7nF
U1
+
NOTE 4
NOTE 5
50
AD8021
–
15
NOTE 2
NOTE 3
NOTE 6
AD780
10 F
100nF
+
10 F
100nF
+
100nF
+
10 F
INBN
ANALOG INPUT B
C
C
2.7nF
U2
+
NOTE 4
NOTE 5
50
AD8021
–
15
50
+
1 F
NOTES
1. SEE VOLTAGE REFERENCE INPUT SECTION.
2. WITH THE RECOMMENDED VOLTAGE REFERENCES, C
IS 47 F. SEE VOLTAGE REFERENCE INPUT SECTION.
3. OPTIONAL CIRCUITRY FOR HARDWARE GAIN CALIBRATION.
4. THE AD8021 IS RECOMMENDED. SEE DRIVER AMPLIFIER CHOICE SECTION.
5. SEE ANALOG INPUT SECTION.
6. OPTION, SEE POWER SUPPLY SECTION.
7. OPTIONAL LOW JITTER
CNVST
. SEE CONVERSION CONTROL SECTION.
A0
INBx
INAN
Figure 5. Typical Connection Diagram (Serial Interface)
During the acquisition phase, for ac signals, the AD7654 behaves
like a one-pole RC filter consisted of the equivalent resistance
R
A
, R
B
, and C
S
. The resistors R
A
and R
B
are typically 500
and
are a lumped component made up of some serial resistor and the
on resistance of the switches. The capacitor C
S
is typically 32 pF
and is mainly the ADC sampling capacitor. This one-pole filter with
a typical –3 dB cutoff frequency of 10 MHz reduces undesirable
aliasing effect and limits the noise coming from the inputs.
Because the input impedance of the AD7654 is very high, the
AD7654 can be driven directly by a low impedance source
without gain error. As shown in Figure 5 that allows the user
to put an external one-pole RC filter between the output of
the amplifier output and the ADC analog inputs to even
further improve the noise filtering done by the AD7654 ana-
log input circuit. However, the source impedance has to be
kept low because it affects the ac performance, especially the
total harmonic distortion. The maximum source impedance
depends on the amount of total harmonic distortion (THD)
that can be tolerated. The THD degrades with increase of the
source impedance.
Driver Amplifier Choice
Although the AD7654 is easy to drive, the driver amplifier
needs to meet at least the following requirements:
The driver amplifier and the AD7654 analog input circuit
together have to be able to settle for a full-scale step of the
capacitor array at a 16-bit level (0.0015%). In the amplifier’s
data sheet, the settling at 0.1% or 0.01% is more commonly
specified. It could significantly differ from the settling time
at a 16-bit level and, therefore, it should be verified prior to
the driver selection. The tiny op amp AD8021, which com-
bines ultralow noise and a high gain bandwidth, meets this
settling time requirement even when used with a high gain
of up to 13.
相關PDF資料 |
PDF描述 |
|---|---|
| AD7654ACP | Dual 2-Channel Simultaneous Sampling SAR 500 kSPS 16-Bit ADC |
| AD7654ACPRL | Dual 2-Channel Simultaneous Sampling SAR 500 kSPS 16-Bit ADC |
| AD7654AST | Dual 2-Channel Simultaneous Sampling SAR 500 kSPS 16-Bit ADC |
| AD7654ASTRL | Dual 2-Channel Simultaneous Sampling SAR 500 kSPS 16-Bit ADC |
| AD7655 | Low Cost 4-Channel 1 MSPS 16-Bit ADC |
相關代理商/技術參數 |
參數描述 |
|---|---|
| AD7654ACP | 制造商:Analog Devices 功能描述:ADC Single SAR 500ksps 16-bit Parallel/Serial 48-Pin LFCSP EP 制造商:Rochester Electronics LLC 功能描述:16-BIT SIMULTANEOUS SAMPLING 500KSPS ADC - Bulk 制造商:Analog Devices 功能描述:IC 16BIT ADC SMD 7654 LFSCP-48 |
| AD7654ACPRL | 制造商:Analog Devices 功能描述:ADC Single SAR 500ksps 16-bit Parallel/Serial 48-Pin LFCSP EP T/R 制造商:Analog Devices 功能描述:ADC SGL SAR 500KSPS 16BIT PARALLEL/SERL 48LFCSP EP - Tape and Reel 制造商:Rochester Electronics LLC 功能描述:16-BIT SIMULTANEOUS SAMPLING 500KSPS ADC - Bulk |
| AD7654ACPZ | 功能描述:IC ADC 16BIT DUAL 2CH 48-LFCSP RoHS:是 類別:集成電路 (IC) >> 數據采集 - 模數轉換器 系列:PulSAR® 標準包裝:1 系列:- 位數:14 采樣率（每秒）:83k 數據接口:串行，并聯 轉換器數目: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 輸入數目和類型:1 個單端，雙極 |
| AD7654ACPZRL | 功能描述:IC ADC 16BIT DUAL 2CH 48LFCSP RoHS:是 類別:集成電路 (IC) >> 數據采集 - 模數轉換器 系列:PulSAR® 標準包裝:1,000 系列:- 位數:12 采樣率（每秒）:300k 數據接口:并聯 轉換器數目: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） 供應商設備封裝:24-SOIC 包裝:帶卷 (TR) 輸入數目和類型:1 個單端，單極；1 個單端，雙極 |
| AD7654AST | 制造商:Analog Devices 功能描述:ADC Single SAR 500ksps 16-bit Parallel/Serial 48-Pin LQFP 制造商:Rochester Electronics LLC 功能描述:16-BIT SIMULTANEOUS SAMPLING 500KSPS - Bulk 制造商:Analog Devices 功能描述:IC 16BIT ADC SMD 7654 LQFP48 |
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