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参数资料
| 型号： | AD7851KRZ |
| 厂商： | Analog Devices Inc |
| 文件页数： | 11/36页 |
| 文件大小： | 0K |
| 描述： | IC ADC 14BIT SRL 333KSPS 24-SOIC |
| 标准包装： | 31 |
| 位数： | 14 |
| 采样率（每秒）： | 333k |
| 数据接口： | 8051，QSPI?，串行，SPI? µP |
| 转换器数目： | 2 |
| 功率耗散（最大）： | 89.25mW |
| 电压电源： | 模拟和数字 |
| 工作温度： | 0°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 24-SOIC（0.295"，7.50mm 宽） |
| 供应商设备封装： | 24-SOIC W |
| 包装： | 管件 |
| 输入数目和类型： | 1 个伪差分，单极；1 个伪差分，双极 |
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–19–
REV. B
AD7851
INPUT FREQUENCY (kHz)
–72
–74
–90
0.91
100
13.4
25.7
38.3
50.3
–76
–78
–80
–88
PSRR
(dB)
–82
–84
–86
63.5
74.8
87.4
AVDD = DVDD = 5.0V
100mV pk-pk SINEWAVE ON AVDD
REFIN = 4.098 EXT REFERENCE
Figure 22. PSRR vs. Frequency
POWER-DOWN OPTIONS
The AD7851 provides flexible power management to allow the
user to achieve the best power performance for a given throughput
rate. The power management options are selected by programming
the power management bits, PMGT1 and PMGT0, in the con-
trol register and by use of the
SLEEP pin. Table VI summarizes
the power-down options that are available and how they can be
selected by using either software, hardware, or a combination of
both. The AD7851 can be fully or partially powered down. When
fully powered down, all the on-chip circuitry is powered down
and IDD is 1
A typ. If a partial power-down is selected, then all
the on-chip circuitry except the reference is powered down and IDD
is 400
A typ. The choice of full or partial power-down does not
give any significant improvement in throughput with a power-down
between conversions. (This is discussed in the Power-Up Times
section which follows.) But a partial power-down does allow the
on-chip reference to be used externally even though the rest of the
AD7851 circuitry is powered down. It also allows the AD7851 to
be powered up faster after a long power-down period when using
the on-chip reference. (See the Using the Internal (On-Chip) Ref-
erence section which follows.)
When using the
SLEEP pin, the power management bits
PMGT1 and PMGT0 should be set to 0 (default status on
power-up). Bringing the
SLEEP pin logic high ensures normal
operation, and the part does not power down at any stage. This
may be necessary if the part is being used at high throughput
rates when it is not possible to power down between conver-
sions. If the user wishes to power down between conversions at
lower throughput rates (that is, <100 kSPS for the AD7851) to
achieve better power performances, then the
SLEEP pin should
be tied logic low.
If the power-down options are to be selected in software only,
then the
SLEEP pin should be tied logic high. By setting the
power management bits PMGT1 and PMGT0 as shown in
Table VI, a full power-down, full power-up, full power-down
between conversions, and a partial power-down between con-
versions can be selected.
A combination of hardware and software selection can also be
used to achieve the desired effect.
Table VI. Power Management Options
PMGT1
PMGT0
SLEEP
Bit
Pin
Comment
00
0
Full power-down between
conversions (HW/SW)
00
1
Full power-up (HW/SW)
01
X
Full power-down between
conversions (SW)
10
X
Full power-down (SW)
11
X
Partial power-down between
conversions (SW)
SW = Software selection, HW = Hardware selection.
0V TO VREF
INPUT
DIN AT DGND
=> NO WRITING
TO DEVICE
3-WIRE MODE
SELECTED
CURRENT, I = 12mA TYP
AVDD
DVDD
AIN(+)
AIN(–)
AMODE
CREF1
CREF2
SLEEP
DIN
DOUT
SYNC
SM1
SM2
CONVST
AGND
DGND
CLKIN
SCLK
REFIN/REFOUT
POLARITY
AD7851
ANALOG
(5V)
0.01 F
0.1 F
10 F
DVDD
UNIPOLAR RANGE
0.01 F
SERIAL MODE
SELECTION BITS
MASTER
CLOCK
INPUT
CONVERSION
START INPUT
SERIAL DATA OUTPUT
0.1 F
CAL
INTERNAL
REFERENCE
6MHz/7MHz
OSCILLATOR
SERIAL CLOCK OUTPUT
285kHz/ 333kHz PULSE
GENERATOR
OPTIONAL
EXTERNAL
REFERENCE
0.01 F
0.1 F
470nF
AUTO CAL ON
POWER-UP
REF198
AUTO POWER-
DOWN AFTER
CONVERSION
LOW POWER
C/ P
Figure 23. Typical Low Power Circuit
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相关代理商/技术参数 |
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| AD7851KRZ3 | 制造商:AD 制造商全称:Analog Devices 功能描述:14-Bit 333 kSPS Serial A/D Converter |
| AD7851KRZ-REEL | 功能描述:IC ADC 14BIT SRL 333KSPS 24-SOIC RoHS:是 类别:集成电路 (IC) >> 数据采集 - 模数转换器 系列:- 标准包装:1,000 系列:- 位数:12 采样率（每秒）:300k 数据接口:并联 转换器数目:1 功率耗散（最大）:75mW 电压电源:单电源 工作温度:0°C ~ 70°C 安装类型:表面贴装 封装/外壳:24-SOIC（0.295"，7.50mm 宽） 供应商设备封装:24-SOIC 包装:带卷 (TR) 输入数目和类型:1 个单端，单极；1 个单端，双极 |
| AD7851KRZ-REEL3 | 制造商:AD 制造商全称:Analog Devices 功能描述:14-Bit 333 kSPS Serial A/D Converter |
| AD7853 | 制造商:AD 制造商全称:Analog Devices 功能描述:3 V to 5 V Single Supply, 200 kSPS 12-Bit Sampling ADCs |
| AD7853AN | 制造商:Analog Devices 功能描述:ADC Single SAR 200ksps 12-bit Serial 24-Pin PDIP 制造商:Analog Devices 功能描述:ADC SGL SAR 200KSPS 12-BIT SERL 24PDIP - Rail/Tube 制造商:Rochester Electronics LLC 功能描述:SELF CAL.SERIAL 12-BIT ADC I.C. - Bulk 制造商:Analog Devices 功能描述:3 V to 5 V Single Supply, 200 kSPS 12-Bit Sampling ADCs |
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