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参数资料
| 型号： | AD7810YRZ |
| 厂商： | Analog Devices Inc |
| 文件页数： | 9/11页 |
| 文件大小： | 0K |
| 描述： | IC ADC 10BIT SRL HS LP 8SOIC |
| 标准包装： | 98 |
| 位数： | 10 |
| 采样率（每秒）： | 350k |
| 数据接口： | 串行 |
| 转换器数目： | 1 |
| 功率耗散（最大）： | 17.5mW |
| 电压电源： | 单电源 |
| 工作温度： | -40°C ~ 105°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-SOIC（0.154"，3.90mm 宽） |
| 供应商设备封装： | 8-SOIC |
| 包装： | 管件 |
| 输入数目和类型： | 2 个伪差分，单极 |
AD7810
–7–
REV. B
When using the pseudo differential input scheme, the signal on
VIN– must not vary by more than a 1/2 LSB during the conver-
sion process. If the signal on VIN– varies during conversion, the
conversion result will be incorrect. For single-ended operation,
VIN– is always connected to AGND. Figure 9 shows the AD7810
pseudo differential input being used to make a unipolar dc cur-
rent measurement. A sense resistor is used to convert the current
to a voltage and the voltage, is applied to the differential input
as shown.
VDD
RSENSE
RL
VIN+
VIN–
AD7810
Figure 9. DC Current Measurement Scheme
DC Acquisition Time
The ADC starts a new acquisition phase at the end of a conver-
sion and ends on the falling edge of the CONVST signal. At the
end of a conversion there is a settling time associated with the
sampling circuit. This settling time lasts approximately 100 ns.
The analog signal on VIN+ is also being acquired during this
settling time; therefore, the minimum acquisition time needed is
approximately 100 ns.
Figure 10 shows the equivalent charging circuit for the sampling
capacitor when the ADC is in its acquisition phase. R2 repre-
sents the source impedance of a buffer amplifier or resistive
network; R1 is an internal multiplexer resistance and C1 is the
sampling capacitor.
C1
3.5pF
R1
125
VIN+
R2
Figure 10. Equivalent Sampling Circuit
During the acquisition phase, the sampling capacitor must be
charged to within a 1/2 LSB of its final value. The time it takes
to charge the sampling capacitor (tCHARGE) is given by the fol-
lowing formula:
tCHARGE = 7.6
× (R2 + 125 ) × 3.5 pF
For small values of source impedance, the settling time associated
with the sampling circuit (100 ns) is, in effect, the acquisition
time of the ADC. For example, with a source impedance (R2)
of 10
, the charge time for the sampling capacitor is approxi-
mately 4 ns. The charge time becomes significant for source
impedances of 2 k
and greater.
AC Acquisition Time
In ac applications it is recommended to always buffer analog
input signals. The source impedance of the drive circuitry must
be kept as low as possible to minimize the acquisition time of
the ADC. Large values of source impedance will cause the THD
to degrade at high throughput rates. In addition, better perfor-
mance can generally be achieved by using an external 1 nF
capacitor on VIN+.
ADC TRANSFER FUNCTION
The output coding of the AD7810 is straight binary. The
designed code transitions occur at successive integer LSB values
(i.e., 1 LSB, 2 LSBs, etc.). The LSB size is = VREF/1024. The
ideal transfer characteristic for the AD7810 is shown in Figure
11 below.
000...010
000...001
000...000
ADC
CODE
0V
+VREF –1LSB
ANALOG INPUT
111...111
111...110
111...000
011...111
1LSB
1LSB = VREF/1024
Figure 11. Transfer Characteristic
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相关代理商/技术参数 |
参数描述 |
|---|---|
| AD7810YRZ | 制造商:Analog Devices 功能描述:IC, ADC, 10BIT, 350KSPS, SOIC-8 |
| AD7810YRZ-REEL | 功能描述:IC ADC 10BIT SRL HS LP 8SOIC RoHS:是 类别:集成电路 (IC) >> 数据采集 - 模数转换器 系列:- 标准包装:2,500 系列:- 位数:16 采样率（每秒）:15 数据接口:MICROWIRE?，串行，SPI? 转换器数目:1 功率耗散（最大）:480µW 电压电源:单电源 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:38-WFQFN 裸露焊盘 供应商设备封装:38-QFN（5x7） 包装:带卷 (TR) 输入数目和类型:16 个单端，双极；8 个差分，双极 配用:DC1011A-C-ND - BOARD DELTA SIGMA ADC LTC2494 |
| AD7810YRZ-REEL7 | 功能描述:IC ADC 10BIT SRL HS LP 8SOIC RoHS:是 类别:集成电路 (IC) >> 数据采集 - 模数转换器 系列:- 标准包装:2,500 系列:- 位数:16 采样率（每秒）:15 数据接口:MICROWIRE?，串行，SPI? 转换器数目:1 功率耗散（最大）:480µW 电压电源:单电源 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:38-WFQFN 裸露焊盘 供应商设备封装:38-QFN（5x7） 包装:带卷 (TR) 输入数目和类型:16 个单端，双极；8 个差分，双极 配用:DC1011A-C-ND - BOARD DELTA SIGMA ADC LTC2494 |
| AD7811 | 制造商:AD 制造商全称:Analog Devices 功能描述:+2.7 V to +5.5 V, 350 kSPS, 10-Bit 4-/8-Channel Sampling ADCs |
| AD7811YN | 制造商:Analog Devices 功能描述:ADC Single SAR 350ksps 10-bit Serial 16-Pin PDIP 制造商:Rochester Electronics LLC 功能描述:4 CH. 10-BIT ADC I.C. - Bulk 制造商:Analog Devices 功能描述:IC 10BIT ADC 4CH 7811 DIP16 |
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