参数资料
| 型号： | AD7790BRM |
| 厂商： | Analog Devices Inc |
| 文件页数： | 5/20页 |
| 文件大小： | 0K |
| 描述： | IC ADC 16BIT BUFFERED LP 10MSOP |
| 标准包装： | 50 |
| 位数： | 16 |
| 采样率（每秒）： | 120 |
| 数据接口： | DSP，MICROWIRE?，QSPI?，串行，SPI? |
| 转换器数目： | 1 |
| 功率耗散（最大）： | 230µW |
| 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： | 10-TFSOP，10-MSOP（0.118"，3.00mm 宽） |
| 供应商设备封装： | 10-MSOP |
| 包装： | 管件 |
| 输入数目和类型： | 1 个差分，双极 |
Data Sheet
AD7790
Rev. A | Page 13 of 20
ADC CIRCUIT INFORMATION
OVERVIEW
The AD7790 is a low power ADC that incorporates a ∑- mod-
ulator, a buffer, a PGA, and on-chip digital filtering intend-ed
for the measurement of wide dynamic range, low frequency
signals such as those in pressure transducers, weigh scales, and
temperature measurement applications.
The part has one differential input that can be buffered or
unbuffered. Buffering the input channel means that the part can
accommodate significant source impedances on the analog
input and that R, C filtering (for noise rejection or RFI reduc-
tion) can be placed on the analog input, if required. The device
requires an external reference of 2.5 nominal. Figure 7 shows
the basic connections required to operate the part.
03538-0-006
IN+
10
F
0.1
F
IN–
OUT–
POWER
SUPPLY
OUT+
REFIN(+)
CS
DOUT/RDY
SCLK
VDD
GND
AIN(+)
AIN(–)
REFIN(–)
AD7790
MICROCONTROLLER
Figure 7. Basic Connection Diagram
The output rate of the AD7790 (fADC) is user programmable
with the settling time equal to 2 × tADC. Normal mode rejection
is the major function of the digital filter. Table 13 lists the avail-
able output rates from the AD7790. Simultaneous 50 Hz and
60 Hz rejection is optimized when the update rate equals
16.6 Hz as notches are placed at both 50 Hz and 60 Hz with this
update rate (see Figure 6).
NOISE PERFORMANCE
Table 14 shows the output rms noise, rms resolution, and peak-
to-peak resolution (rounded to the nearest 0.5 LSB) for the
different update rates and input ranges for the AD7790. The
numbers given are with a reference of 2.5 V. The numbers are
typical and generated with a differential input voltage of 0 V.
The peak-to-peak resolution figures represent the resolution for
which there will be no code flicker within a six-sigma limit. The
output noise comes from two sources. The first is the electrical
noise in the semiconductor devices (device noise) used in the
implementation of the modulator. The second is quantization
noise, which is added when the analog input is converted into
the digital domain. The device noise is at a low level and is
independent of frequency. The quantization noise starts at an
even lower level but rises rapidly with increasing frequency to
become the dominant noise source.
Table 14. Typical Peak-to-Peak Resolution (Effective
Resolution) vs. Update Rate and Input Range
Update Rate
Input Range
±0.3125
±0.625
±1.25
±2.5
9.5
16 (16)
13.3
16 (16)
16.7
16 (16)
16.6
16 (16)
20
15.5 (16)
16 (16)
33.3
14.5 (16)
15.5 (16)
16 (16)
100
11.5 (14)
12.5 (15)
13.5 (16)
14.5 (16)
120
11 (13.5)
12 (14.5)
13 (15.5)
14 (16)
REDUCED CURRENT MODES
The AD7790 has a current consumption of 160 A maximum
when operated with the buffer enabled and with a 5 V power
supply. The power can be reduced further by setting bits CDIV1
and CDIV0 in the filter register appropriately (see Table 15).
By setting these bits, the internal clock is divided by 2, 4, or 8
before being applied to the modulator and filter, resulting in a
reduction in the digital current.
When the internal clock is reduced, the update rate will also be
reduced. For example, if the filter bits are set to give an update
rate of 16.6 Hz when the AD7790 is operated in full clock
mode, the update rate will equal 8.3 Hz in divide by 2 mode. In
these low power modes, there may be some degradation in the
ADC performance.
Table 15. Low Power Mode Selection
CDIV[1:0]
Clock
Typ Current, Buffered (A)
Typ Current, Unbuffered (A)
50 Hz/60 Hz Rejection (dB)
00
1
146
75
70
10
1/2
87
45
72
10
1/4
56
30
88
11
1/8
41
25
89
相关PDF资料 |
PDF描述 |
|---|---|
| AD7791BRM | IC ADC 24BIT BUFFERED LP 10MSOP |
| AD7793BRU | IC ADC 24BIT 3CH LP 16-TSSOP |
| AD7794BRU | IC ADC 24BIT 6CH LP 24-TSSOP |
| AD7797BRUZ-REEL | IC ADC 24BIT SIG-DEL 1CH 16TSSOP |
| AD7799BRU | IC ADC 24BIT 3CH LP 16-TSSOP |
相关代理商/技术参数 |
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| AD7790BRM-REEL | 制造商:Analog Devices 功能描述:ADC Single Delta-Sigma 120sps 16-bit Serial 10-Pin MSOP T/R 制造商:Analog Devices 功能描述:ADC SGL DELTA-SIGMA 0.12KSPS 16BIT SERL 10MSOP - Tape and Reel |
| AD7790BRMZ | 功能描述:IC ADC 16BIT SIGMA-DELTA 10-MSOP 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 系列:microPOWER™ 位数:8 采样率（每秒）:1M 数据接口:串行，SPI? 转换器数目:1 功率耗散（最大）:- 电压电源:模拟和数字 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:24-VFQFN 裸露焊盘 供应商设备封装:24-VQFN 裸露焊盘（4x4） 包装:Digi-Reel® 输入数目和类型:8 个单端，单极 产品目录页面:892 (CN2011-ZH PDF) 其它名称:296-25851-6 |
| AD7790BRMZ | 制造商:Analog Devices 功能描述:IC 24-BIT ADC |
| AD7790BRMZ-REEL | 功能描述:IC ADC 16BIT SIGMA-DELTA 10-MSOP 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 |
| AD7791 | 制造商:AD 制造商全称:Analog Devices 功能描述:Low Power, Buffered 24-Bit Sigma-Delta ADC |
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