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| 型号： | AD7699BCPZ |
| 厂商： | Analog Devices Inc |
| 文件页数： | 14/28页 |
| 文件大小： | 0K |
| 描述： | IC ADC 8CH 16BIT 500KSPS 20LFCSP |
| 标准包装： | 1 |
| 位数： | 16 |
| 采样率（每秒）： | 500k |
| 数据接口： | DSP，MICROWIRE?，QSPI?，串行，SPI? |
| 转换器数目： | 1 |
| 功率耗散（最大）： | 32mW |
| 电压电源： | 模拟和数字 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 20-VFQFN 裸露焊盘，CSP |
| 供应商设备封装： | 20-LFCSP-VQ |
| 包装： | 托盘 |
| 输入数目和类型： | 8 个单端，单极；4 个差分，单极；4 个差分，双极；4 个伪差分，双极 |
| 产品目录页面： | 778 (CN2011-ZH PDF) |
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Data Sheet
AD7699
Rev. B | Page 21 of 28
The register can be written to during conversion, during acquisi-
tion, or spanning acquisition/conversion and is updated at the
end of conversion, tCONV (maximum). There is always a one deep
delay when writing the CFG register. Note that at power-up, the
CFG register is undefined and two dummy conversions are
required to update the register. To preload the CFG register
with a factory setting, hold DIN high for two conversions. Thus
CFG[13:0] = 0x3FFF. This sets the AD7699 for the following:
IN[7:0] unipolar referenced to GND, sequenced in order
Full bandwidth for a one-pole filter
Internal reference/temperature sensor disabled, buffer
enabled
Enables the sequencer
No readback of the CFG register
Table 8 summarizes the configuration register bit details. See
the Theory of Operation section for more details.
13
12
11
10
9
8
7
6
5
4
3
2
1
0
CFG
INCC
INx
BW
REF
SEQ
RB
Table 8. Configuration Register Description
Bit(s)
Name
Description
[13]
CFG
Configuration update.
0 = Keep current configuration settings.
1 = Overwrite contents of register.
[12:10]
INCC
Input channel configuration. Selection of pseudobipolar, pseudodifferential, pairs, single-ended, or temperature sensor. Refer to
the
Input Configurations section.
Bit 12
Bit 11
Bit 10
Function
0
Bipolar differential pairs; INx referenced to VREF/2 ± 0.1 V.
0
1
Bipolar; INx referenced to COM = VREF/2 ± 0.1 V.
0
1
Temperature sensor.
1
0
Unipolar differential pairs; INx referenced to GND ± 0.1 V.
1
0
Unipolar, IN0 to IN7 referenced to COM = GND ± 0.1 V (GND sense).
1
Unipolar, IN0 to IN7 referenced to GND.
[9:7]
INx
Input channel selection in binary fashion.
Bit 9
Bit 8
Bit 7
Channel
0
IN0
0
1
IN1
…
1
IN7
[6]
BW
Select bandwidth for low-pass filter. Refer to the
Selectable Low-Pass Filter section.
0 = of BW, uses an additional series resistor to further bandwidth limit the noise. Maximum throughput must also be reduced to .
1 = Full BW.
[5:3]
REF
Reference/buffer selection. Selection of internal, external, and external buffered references, and enabling of the on-chip
temperature sensor. Refer to the Voltage Reference Output/Input section.
Bit 5
Bit 4
Bit 3
Function
0
Not used
0
1
Internal reference, REF = 4.096 V output,
temperature enabled.
0
1
0
External reference, temperature enabled.
0
1
External reference, internal buffer, temperature enabled.
1
0
External reference, temperature disabled.
1
External reference, internal buffer, temperature disabled.
[2:1]
SEQ
Channel sequencer. Allows for scanning channels in an IN0 to IN[7:0] fashion. Refer to the Sequencer section.
Bit 2
Bit 1
Function
0
Disable sequencer.
0
1
Update configuration during sequence.
1
0
Scan IN0 to IN[7:0] (set in CFG[9:7]), then temperature.
1
Scan IN0 to IN[7:0] (set in CFG[9:7]).
0
RB
Read back the CFG register.
0 = Read back current configuration at end of data.
1 = Do not read back contents of configuration.
1 X = don’t care.
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