参数资料
型号: AD7732BRUZ
厂商: Analog Devices Inc
文件页数: 2/32页
文件大小: 0K
描述: IC ADC 24BIT 2-CH 28-TSSOP
标准包装: 50
位数: 24
采样率(每秒): 15.4k
数据接口: DSP,MICROWIRE?,QSPI?,串行,SPI?
转换器数目: 1
功率耗散(最大): 100mW
电压电源: 模拟和数字
工作温度: -40°C ~ 105°C
安装类型: 表面贴装
封装/外壳: 28-TSSOP(0.173",4.40mm 宽)
供应商设备封装: 28-TSSOP
包装: 管件
输入数目和类型: 2 个差分,单极;2 个差分,双极
产品目录页面: 779 (CN2011-ZH PDF)
配用: EVAL-AD7732EBZ-ND - BOARD EVAL FOR AD7732
AD7732
Rev. A | Page 10 of 32
OUTPUT NOISE AND RESOLUTION SPECIFICATION
The AD7732 can be operated with chopping enabled or
disabled, allowing the ADC to be programmed to either
optimize the throughput rate and channel switching time or to
optimize the offset drift performance. Noise tables for these two
primary modes of operation are outlined below for a selection
of output rates and settling times.
The AD7732 noise performance depends on the selected
chopping mode, the filter word (FW) value, and the selected
analog input range. The AD7732 noise will not vary
significantly with MCLK frequency.
Chopping Enabled
The first mode, in which the AD7732 is configured with
chopping enabled (CHOP = 1), provides very low noise with
lower output rates. Table 4 to Table 6 show the –3 dB
frequencies and typical performance versus the channel
conversion time and equivalent output data rate, respectively.
Table 4 shows the typical output rms noise. Table 5 shows the
typical effective resolution based on rms noise. Table 6 shows
the typical output peak-to-peak resolution, representing values
for which there will be no code flicker within a 6-sigma limit.
The peak-to-peak resolutions are not calculated based on rms
noise but on peak-to-peak noise.
These typical numbers are generated from 4096 data samples
acquired in continuous conversion mode with an analog input
voltage set to 0 V and MCLK = 6.144 MHz. The conversion
time is selected via the channel conversion time register.
Table 4. Typical Output RMS Noise in μV vs. Conversion Time and Input Range with Chopping Enabled
FW
Conversion Time
Register
Conversion Time
(μs)
Output Data Rate
(Hz)
–3 dB Frequency
(Hz)
RMS Noise
(μV)
127
FFh
2686
372
200
9.6
46
AEh
999
1001
520
15.5
22
96h
499
2005
1040
22.7
17
91h
395
2534
1300
26.1
8
88h
207
4826
2500
39.2
6
86h
166
6041
3100
46.0
2
82h
82
12166
6300
120.0
Table 5. Typical Effective Resolution in Bits vs. Conversion Time and Input Range with Chopping Enabled
Input Range/Effective Resolution (Bits)
FW
Conversion Time
Register
Conversion Time
(μs)
Output Data Rate
(Hz)
–3 dB Frequency
(Hz)
±10 V
0 V to +10 V
±5 V
0 V to +5 V
127
FFh
2686
372
200
21.0
20.0
19.0
46
AEh
999
1001
520
20.3
19.3
18.3
22
96h
499
2005
1040
19.7
18.7
17.7
17
91h
395
2534
1300
19.5
18.5
17.5
8
88h
207
4826
2500
19.0
18.0
17.0
6
86h
166
6041
3100
18.7
17.7
16.7
2
82h
82
12166
6300
17.3
16.3
15.3
Table 6. Typical Peak-to-Peak Resolution in Bits vs. Conversion Time and Input Range with Chopping Enabled
Input Range/Peak-to-Peak Resolution (Bits)
FW
Conversion Time
Register
Conversion Time
(μs)
Output Data Rate
(Hz)
–3 dB Frequency
(Hz)
±10 V
0 V to +10 V
±5 V
0 V to +5 V
127
FFh
2686
372
200
18.1
17.1
16.1
46
AEh
999
1001
520
17.4
16.4
15.4
22
96h
499
2005
1040
16.9
15.9
14.9
17
91h
395
2534
1300
16.7
15.7
14.7
8
88h
207
4826
2500
16.2
15.2
14.2
6
86h
166
6041
3100
15.8
14.8
13.8
2
82h
82
12166
6300
15.0
13.4
12.4
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