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參數(shù)資料
型號(hào)： EVAL-AD7763EDZ
廠商： Analog Devices Inc
文件頁(yè)數(shù)： 14/33頁(yè)
文件大?。?/td> 0K
描述： BOARD EVAL CONTROL AD7763
標(biāo)準(zhǔn)包裝： 1
ADC 的數(shù)量： 1
位數(shù)： 24
采樣率（每秒）： 625k
數(shù)據(jù)接口： 并聯(lián)
輸入范圍： ±3.25 Vpp
在以下條件下的電源（標(biāo)準(zhǔn)）： 955.5mW @ 625kSPS
工作溫度： -40°C ~ 85°C
已用 IC / 零件： AD7763
已供物品： 板，CD
AD7763
Data Sheet
Rev. B | Page 20 of 32
DRIVING THE AD7763
The AD7763 has an on-chip differential amplifier that operates
with a supply voltage (AVDD3) from 3.15 V to 5.25 V. For a 4.096 V
reference, the supply voltage must be 5 V.
To achieve the specified performance in normal mode, the
differential amplifier should be configured as a first-order
antialias filter, as shown in Figure 31. Any additional filtering
should be carried out in previous stages using low noise, high
performance op amps, such as the AD8021.
Suitable component values for the first-order filter are shown in
Table 10. The values in Table 10 yield a 10 dB attenuation at the
first alias point of 19 MHz.
05476-
016
A1
RIN
RFB
CFB
RIN
RM
CS
RFB
CFB
VIN–
A
B
VIN+
Figure 31. Differential Amplifier Configuration
Table 10. Normal Mode Component Values
VREF
RIN
RFB
RM
CS
CFB
4.096 V
1 k
655
18
5.6 pF
33 pF
Figure 32 shows the signal conditioning that occurs using the
circuit in Figure 18 with a ±2.5 V input signal biased around
ground and having the component values and conditions in
The differential amplifier always biases the output signal to sit
on the optimum common mode of VREF/2, in this case, 2.048 V.
The signal is also scaled to give the maximum allowable voltage
swing with this reference value. This is calculated as 80% of
VREF; that is, 0.8 × 4.096 V ≈ 3.275 V p-p on each input.
To obtain maximum performance from the AD7763, it is
advisable to drive the ADC with differential signals. Figure 33
shows how a bipolar, single-ended signal biased around ground
can drive the AD7763 with the use of an external op amp, such as
With a 4.096 V reference, a 5 V supply must be provided to the
reference buffer (AVDD4). With a 2.5 V reference, a 3.3 V supply
must be provided to AVDD4.
05476-
017
+2.5V
0V
–2.5V
+2.5V
0V
–2.5V
+3.685V
+2.048V
+0.410V
+3.685V
+2.048V
+0.410V
A
VIN+
VIN–
B
Figure 32. Differential Amplifier Signal Conditioning
05476-
018
A1
RIN
RFB
CFB
RIN
RM
CS
RFB
CFB
VIN–
VIN
VIN+
AD8021
2R
R
Figure 33. Single-Ended-to-Differential Conversion
05476-
019
CS2
CPB2
SS4
SH4
CPA
SS2
SH2
CS1
CPB1
SS3
SH3
SS1
SH1
ANALOG
MODULATOR
VIN+
Figure 34. Equivalent Input Circuit
The AD7763 employs a double sampling front end, as shown in
Figure 34. For simplicity, only the equivalent input circuit for
VIN+ is shown. The equivalent input circuitry for VIN is the same.
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