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參數資料
| 型號： | AD7731 |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | Low Noise, High Throughput 24-Bit Sigma-Delta ADC |
| 中文描述： | 低噪聲，高吞吐量的24位Σ-Δ模數轉換器 |
| 文件頁數： | 7/44頁 |
| 文件大小： | 411K |
| 代理商： | AD7731 |
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AD7731
–7–
REV. 0
FASTSTEP
FILTER
CHOP
ANALOG
INPUT
DIGITAL
OUTPUT
BUFFER
SKIP
OUTPUT
SCALING
22-TAP
FIR FILTER
THE ANALOG INPUT TO THE PART
CAN BE CHOPPED. IN CHOPPING MODE,
THE INPUT IS CHOPPEDAND THE OUTPUT OF
THE FIRST STAGE FILTER IS CHOPPED
REMOVING ERRORS IN THAT PATH.
THE DEFAULT CONDITION IS
CHOPPING DISABLED
THE FIRST STAGE OF THE DIGITAL
FILTERING ON THE PART IS THE
SINC
3
FILTER. THE OUTPUT UPDATE
RATE AND BANDWIDTH OF THIS
FILTER CAN BE PROGRAMMED. IN
SKIP MODE, THE SINC
3
FILTER IS
THE ONLY FILTERING PERFORMED
ON THE P3T.
IN SKIP MODE, THERE IS NO
SECOND STAGE OF FILTERING ON
THE PART. THE SINC
3
FILTER IS
THE ONLY FILTERING PERFORMED
ON THE PART. THIS IS THE
SECOND STAGE FILTER
WITH SKIP DISABLED, THE NORMAL
OPERATING MODE OF THE SECOND STAGE
OF THE DIGITAL FILTERING ON THE PART IS
A FIXED 22-TAP FIR FILTER. IN SKIP MODE,
THIS FIR FILTER IS BYPASSED. WHEN
FASTSTEP
MODE IS ENABLED AND A
STEP INPUT IS DETECTED, THE SECOND
STAGE FILTERING IS PERFORMED BY THE
FAST STEP FILTER UNTIL THE OUTPUT OF
THIS FILTER HAS FULLY SETTLED
THE OUTPUT WORD FROM THE
DIGITAL FILTER IS SCALED BY THE
CALIBRATION COEFFICIENTS
BEFORE BEING PROVIDED AS THE
CONVERSION RESULT
WHEN FASTSTEP MODE IS
ENABLED AND A STEP CHANGE ON
THE INPUT HAS BEEN DETECTED,
THE SECOND STAGE FILTERING IS
PERFORMED BY THE FASTSTEP
FILTER UNTIL THE FIR FILTER HAS
FULLY SETTLED.
THE OUTPUT OF THE FIRST STAGE
OF FILTERING ON THE PART CAN
BE CHOPPED. THE DEFAULT
CONDITION IS CHOPPING
DISABLED
THE PROGRAMMABLE GAIN
CAPABILITY OF THE PART IS
INCORPORATED AROUND THE
SIGMA DELTA MODULATOR.THE
MODULATOR PROVIDES A HIGH-
FREQUENCY 1-BIT DATA STREAM
TO THE DIGITAL FILTER.
THE INPUT SIGNAL IS BUFFERED
ON-CHIP BEFORE BEING APPLIED
TO THE SAMPLING CAPACITOR OF
THE SIGMA DELTA MODULATOR.
THIS ISOLATES THE SAMPLING
CAPACITOR CHARGING CURRENTS
FROM THE ANALOG INPUT PINS
PGA &
SIGMA-DELTA
MODULATOR
SINC
3
FILTER
CHOP
INPUT CHOPPING
SINC
3
FILTER
SKIP MODE
22-TAP FIR FILTER
OUTPUT SCALING
FASTSTEP
FILTER
YY
OUTPUT CHOPPING
PGA & SIGMA-DELTA
MODULATOR
BUFFER
SEE PAGE 25
SEE PAGE 25
SEE PAGE 25
SEE PAGE 26
SEE PAGE 29
SEE PAGE 28
SEE PAGE 25
SEE PAGE 24
SEE PAGE 23
Figure 3. Signal Processing Chain
PIN CONFIGURAT ION
SCLK
MCLK IN
DGND
DV
DD
SYNC
NC
RDY
CS
MCLK OUT
POL
DIN
DOUT
AGND
AV
DD
AIN5
AIN1
STANDBY
14
1
2
24
23
5
6
7
20
19
18
3
4
22
21
8
17
9
16
10
15
11
TOP VIEW
(Not to Scale)
12
13
AD7731
RESET
REF IN(–)
REF IN(+)
AIN2
AIN3/D1
AIN4/D0
AIN6
NC = NO CONNECT
PIN FUNCT ION DE SCRIPT IONS
Pin
No.
Pin
Mnemonic
Function
1
SCLK
Serial Clock. Schmitt-T riggered Logic Input. An external serial clock is applied to this input to transfer
serial data to or from the AD7731. T his serial clock can be a continuous clock with all data transmitted in a
continuous train of pulses. Alternatively, it can be a noncontinuous clock with the information being trans-
mitted to or from the AD7731 in smaller batches of data.
Master Clock signal for the device. T his can be provided in the form of a crystal/resonator or external clock.
A crystal/resonator can be tied across the MCLK IN and MCLK OUT pins. Alternatively, the MCLK IN
pin can be driven with a CMOS-compatible clock and MCLK OUT left unconnected. T he part is specified
with a clock input frequency of 4.9152 MHz.
2
MCLK IN
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| AD7731BN | 功能描述:IC ADC 24BIT SIGMA-DELTA 24-DIP RoHS:否 類別:集成電路 (IC) >> 數據采集 - 模數轉換器 系列:- 產品培訓模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝:2,500 系列:- 位數:12 采樣率（每秒）:3M 數據接口:- 轉換器數目:- 功率耗散（最大）:- 電壓電源:- 工作溫度:- 安裝類型:表面貼裝 封裝/外殼:SOT-23-6 供應商設備封裝:SOT-23-6 包裝:帶卷 (TR) 輸入數目和類型:- |
| AD7731BNZ | 功能描述:IC ADC 24BIT SIGMA-DELTA 24DIP RoHS:是 類別:集成電路 (IC) >> 數據采集 - 模數轉換器 系列:- 標準包裝:1,000 系列:- 位數:12 采樣率（每秒）:300k 數據接口:并聯 轉換器數目:1 功率耗散（最大）:75mW 電壓電源:單電源 工作溫度:0°C ~ 70°C 安裝類型:表面貼裝 封裝/外殼:24-SOIC（0.295"，7.50mm 寬） 供應商設備封裝:24-SOIC 包裝:帶卷 (TR) 輸入數目和類型:1 個單端，單極；1 個單端，雙極 |
| AD7731BR | 功能描述:IC ADC 24BIT 24-SOIC RoHS:否 類別:集成電路 (IC) >> 數據采集 - 模數轉換器 系列:- 標準包裝:1,000 系列:- 位數:12 采樣率（每秒）:300k 數據接口:并聯 轉換器數目:1 功率耗散（最大）:75mW 電壓電源:單電源 工作溫度:0°C ~ 70°C 安裝類型:表面貼裝 封裝/外殼:24-SOIC（0.295"，7.50mm 寬） 供應商設備封裝:24-SOIC 包裝:帶卷 (TR) 輸入數目和類型:1 個單端，單極；1 個單端，雙極 |
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| AD7731BR-REEL7 | 功能描述:IC ADC 24BIT SIGMA-DELTA 24-SOIC RoHS:否 類別:集成電路 (IC) >> 數據采集 - 模數轉換器 系列:- 標準包裝:1,000 系列:- 位數:12 采樣率（每秒）:300k 數據接口:并聯 轉換器數目:1 功率耗散（最大）:75mW 電壓電源:單電源 工作溫度:0°C ~ 70°C 安裝類型:表面貼裝 封裝/外殼:24-SOIC（0.295"，7.50mm 寬） 供應商設備封裝:24-SOIC 包裝:帶卷 (TR) 輸入數目和類型:1 個單端，單極；1 個單端，雙極 |
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