參數(shù)資料
型號(hào)： AD7739BRU-REEL
廠商： Analog Devices Inc
文件頁(yè)數(shù)： 3/32頁(yè)
文件大?。?/td> 0K
描述： IC ADC 24BIT 8CH SIG-DEL 24TSSOP
標(biāo)準(zhǔn)包裝： 2,500
位數(shù)： 24
采樣率（每秒）： 15.1k
數(shù)據(jù)接口： DSP，MICROWIRE?，QSPI?，串行，SPI?
轉(zhuǎn)換器數(shù)目： 1
功率耗散（最大）： 100mW
電壓電源： 模擬和數(shù)字
工作溫度： -40°C ~ 105°C
安裝類型： 表面貼裝
封裝/外殼： 24-TSSOP（0.173"，4.40mm 寬）
供應(yīng)商設(shè)備封裝： 24-TSSOP
包裝： 帶卷 (TR)
輸入數(shù)目和類型： 8 個(gè)單端，單極；8 個(gè)單端，雙極；4 個(gè)差分，單極；4 個(gè)差分，雙極
配用： EVAL-AD7739EBZ-ND - BOARD EVAL FOR AD7739
Data Sheet
AD7739
Rev. A | Page 11 of 32
OUTPUT NOISE AND RESOLUTION SPECIFICATION
The AD7739 can be operated with chopping enabled or
disabled, allowing the ADC to be programmed to optimize
either the offset drift performance or the throughput rate and
channel switching time. Noise tables for these two primary
modes of operation are outlined below for a selection of output
rates and settling times.
The AD7739 noise performance depends on the selected
chopping mode, the filter word (FW) value, and the selected
analog input range. The AD7739 noise does not vary
significantly with MCLK frequency.
CHOPPING ENABLED
The first mode, in which the AD7739 is configured with
chopping enabled (chop = 1), provides very low noise with
lower output rates.
Table 5 to Table 7 show the 3 dB frequencies and typical
performance versus the channel conversion time and equivalent
output data rate, respectively.
Table 5 shows the typical output rms noise. Table 6 shows the
typical effective resolution based on rms noise. Table 7 shows
the typical output peak-to-peak resolution, representing values
for which there is 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 5. Typical Output RMS Noise in V vs. Conversion Time and Input Range with Chopping Enabled
FW
Conversion
Time
Register
Conversion
Time (s)
Output Data
Rate (Hz)
3 dB
Frequency
(Hz)
Input Range/RMS Noise (V)
±2.5 V, +2.5 V
±1.25 V, +1.25 V, ±0.625 V, +0.625 V
127
0xFF
2689
372
200
1.8
1.1
46
0xAE
1001
999
500
2.7
1.7
17
0x91
397
2519
1325
4.8
2.7
10
0x8A
251
3982
2209
9.3
4.7
9
0x89
230
4342
2450
10.8
6.3
2
0x82
84
11838
9500
600
460
Table 6. Typical Effective Resolution in Bits vs. Conversion Time and Input Range with Chopping Enabled
FW
Conversion
Time
Register
Conversion
Time (s)
Output Data
Rate (Hz)
3 dB
Frequency
(Hz)
Input Range/Effective Resolution (Bits)
±2.5 V
+2.5 V
±1.25 V
+1.25 V ±0.625 V +0.625 V
127
0xFF
2689
372
200
21.4
20.4
21.2
20.2
19.2
46
0xAE
1001
999
500
20.8
19.8
20.5
19.5
18.5
17
0x91
397
2519
1325
20.0
19.0
19.8
18.8
17.8
10
0x8A
251
3982
2209
19.0
18.0
19.0
18.0
17.0
9
0x89
230
4342
2450
18.8
17.8
18.6
17.6
16.6
2
0x82
84
11838
9500
12.9
11.9
12.4
11.4
10.4
Table 7. Typical Peak-to-Peak Resolution in Bits vs. Conversion Time and Input Range with Chopping Enabled
FW
Conversion
Time
Register
Conversion
Time (s)
Output Data
Rate (Hz)
–3 dB
Frequency
(Hz)
Input Range/Peak-to-Peak Resolution (Bits)
±2.5 V
+2.5 V
±1.25 V
+1.25 V ±0.625 V +0.625 V
127
0xFF
2689
372
200
18.6
17.6
18.3
17.3
16.3
46
0xAE
1001
999
500
17.9
16.9
17.6
16.6
15.6
17
0x91
397
2519
1325
17.1
16.1
16.9
15.9
14.9
10
0x8A
251
3982
2209
16.2
15.2
16.2
15.2
14.2
9
0x89
230
4342
2450
16.0
15.0
15.8
14.8
13.8
2
0x82
84
11838
9500
10.7
0.7
9.7
8.7
7.7
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