inputs stage of the on-chip buffer amp" />
參數(shù)資料
型號(hào)： AD7707BR
廠商： Analog Devices Inc
文件頁(yè)數(shù)： 19/52頁(yè)
文件大?。?/td> 0K
描述： IC ADC 16BIT 3CH 20-SOIC
標(biāo)準(zhǔn)包裝： 37
位數(shù)： 16
采樣率（每秒）： 500
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）： 1mW
電壓電源： 模擬和數(shù)字
工作溫度： -40°C ~ 85°C
安裝類(lèi)型： 表面貼裝
封裝/外殼： 20-SOIC（0.295"，7.50mm 寬）
供應(yīng)商設(shè)備封裝： 20-SOIC W
包裝： 管件
輸入數(shù)目和類(lèi)型： 1 個(gè)單端，單極；1 個(gè)單端，雙極；2 個(gè)偽差分，單極；2 個(gè)偽差分，雙極
AD7707
Rev. B | Page 26 of 52
In buffered mode, the analog inputs look into the high impedance
inputs stage of the on-chip buffer amplifier. CSAMP is charged via
this buffer amplifier such that source impedances do not affect
the charging of CSAMP. This buffer amplifier has an offset leakage
current of 1 nA. In buffered mode, large source impedances
result in a small dc offset voltage developed across the source
impedance, but not in a gain error.
INPUT SAMPLE RATE
The modulator sample frequency for the AD7707 remains at
fCLKIN/128 (19.2 kHz at fCLKIN = 2.4576 MHz) regardless of the
selected gain. However, gains greater than 1 are achieved by a
combination of multiple input samples per modulator cycle and
a scaling of the ratio of reference capacitor to input capacitor. As
a result of the multiple sampling, the input sample rate of the
device varies with the selected gain (see Table 27). In buffered
mode, the input impedance is constant. In unbuffered mode,
where the analog input looks directly into the sampling capacitor,
the effective input impedance is 1/CSAMP × fS where CSAMP is the
input sampling capacitance and fS is the input sample rate.
Table 27. Input Sampling Frequency vs. Gain
Gain
Input Sampling Frequency (fS)
1
fCLKIN/64 (38.4 kHz at fCLKIN = 2.4576 MHz)
2
2 × fCLKIN/64 (76.8 kHz at fCLKIN =2.4576 MHz)
4
4 × fCLKIN/64 (76.8 kHz at fCLKIN =2.4576 MHz)
8 to 128
8 × fCLKIN/64 (307.2 kHz at fCLKIN = 2.4576 MHz)
BIPOLAR/UNIPOLAR INPUTS
The analog inputs on the low level input channels on the AD7707
can accept either unipolar or bipolar input voltage ranges with
respect to LOCOM.
The high level input channel handles true bipolar signals of ±10 V
max
for guaranteed operation.
Bipolar or unipolar options are chosen by programming the
B/U bit of the setup register. This programs the channel for
either unipolar or bipolar operation. Programming the channel
for either unipolar or bipolar operation does not change any of
the channel conditions, it simply changes the data output coding
and the points on the transfer function where calibrations occur.
In unipolar operation, the output coding is straight binary. In
bipolar mode, the output coding is offset binary.
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參數(shù)描述
AD7707BR-REEL 制造商:Analog Devices 功能描述:ADC Single Delta-Sigma 500sps 16-bit Serial 20-Pin SOIC W T/R 制造商:Analog Devices 功能描述:ADC SGL DELTA-SIGMA 0.5KSPS 16BIT SERL 20SOIC W - Tape and Reel
AD7707BR-REEL7 制造商:Analog Devices 功能描述:ADC Single Delta-Sigma 500sps 16-bit Serial 20-Pin SOIC W T/R 制造商:Analog Devices 功能描述:ADC SGL DELTA-SIGMA 0.5KSPS 16BIT SERL 20SOIC W - Tape and Reel
AD7707BRU 功能描述:IC ADC 16BIT 3CH 20-TSSOP RoHS:否 類(lèi)別:集成電路 (IC) >> 數(shù)據(jù)采集 - 模數(shù)轉(zhuǎn)換器 系列:- 標(biāo)準(zhǔn)包裝:1,000 系列:- 位數(shù):12 采樣率（每秒）:300k 數(shù)據(jù)接口:并聯(lián) 轉(zhuǎn)換器數(shù)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(lèi)型:表面貼裝 封裝/外殼:24-SOIC（0.295"，7.50mm 寬） 供應(yīng)商設(shè)備封裝:24-SOIC 包裝:帶卷 (TR) 輸入數(shù)目和類(lèi)型:1 個(gè)單端，單極；1 個(gè)單端，雙極
AD7707BRU-REEL 制造商:Analog Devices 功能描述:ADC Single Delta-Sigma 500sps 16-bit Serial 20-Pin TSSOP T/R 制造商:Analog Devices 功能描述:ADC SGL DELTA-SIGMA 0.5KSPS 16BIT SERL 20TSSOP - Tape and Reel
AD7707BRU-REEL7 功能描述:IC ADC 16BIT 3CH 20-TSSOP T/R RoHS:否 類(lèi)別:集成電路 (IC) >> 數(shù)據(jù)采集 - 模數(shù)轉(zhuǎn)換器 系列:- 標(biāo)準(zhǔn)包裝:1,000 系列:- 位數(shù):16 采樣率（每秒）:45k 數(shù)據(jù)接口:串行 轉(zhuǎn)換器數(shù)目:2 功率耗散（最大）:315mW 電壓電源:模擬和數(shù)字 工作溫度:0°C ~ 70°C 安裝類(lèi)型:表面貼裝 封裝/外殼:28-SOIC（0.295"，7.50mm 寬） 供應(yīng)商設(shè)備封裝:28-SOIC W 包裝:帶卷 (TR) 輸入數(shù)目和類(lèi)型:2 個(gè)單端，單極
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