參數(shù)資料
型號(hào)： EVAL-AD7765EDZ
廠商： Analog Devices Inc
文件頁數(shù)： 13/33頁
文件大?。?/td> 0K
描述： BOARD EVAL AD7765
標(biāo)準(zhǔn)包裝： 1
ADC 的數(shù)量： 1
位數(shù)： 24
采樣率（每秒）： 156k
數(shù)據(jù)接口： 串行，SPI?
輸入范圍： ±3.2768 V
在以下條件下的電源（標(biāo)準(zhǔn)）： 300mW @ 156kSPS
工作溫度： -40°C ~ 85°C
已用 IC / 零件： AD7765
已供物品： 板
AD7765
Rev. A | Page 19 of 32
MODULATOR INPUT STRUCTURE
The AD7765 employs a double-sampling front end, as shown in
Figure 32. For simplicity, only the equivalent input circuitry for
VIN+ is shown. The equivalent circuitry for VIN is the same.
CS2
CPB2
SS4
SH4
CPA
SS2
SH2
CS1
CPB1
SS3
SH3
SS1
SH1
ANALOG
MODULATOR
VIN+
0
651
9-
0
27
Figure 32. Equivalent Input Circuit
The SS1 and SS3 sampling switches are driven by ICLK,
whereas the SS2 and SS4 sampling switches are driven by ICLK.
When ICLK is high, the analog input voltage is connected to
CS1. On the falling edge of ICLK, the SS1 and SS3 switches
open and the analog input is sampled on CS1. Similarly, when
ICLK is low, the analog input voltage is connected to CS2. On
the rising edge of ICLK, the SS2 and SS4 switches open, and the
analog input is sampled on CS2.
The CPA, CPB1, and CPB2 capacitors represent parasitic capa-
citances that include the junction capacitances associated with
the MOS switches.
Table 8. Equivalent Component Values
CS1
CS2
CPA
CPB1/CPB2
13 pF
5 pF
DRIVING THE MODULATOR INPUTS DIRECTLY
The AD7765 can be configured so that the on-board differential
amplifier can be disabled and the modulator can be driven
directly using discrete amplifiers. This allows the user to lower
the power dissipation.
To power down the on board differential amplifier, the user
issues a write to set the AMP OFF bit in the control register to
logic high (see Figure 33).
SCO (O)
CONTROL REGISTER
ADDRESS 0x0001
AMP OFF MODE
DATA 0x0001
FSI (I)
SDI (I)
32 ×
tSCO
0
65
19
-30
1
Figure 33. Writing to the AD7765 Control Register Turning Off the On-Board
Differential Amplifier
The AD7765 modulator inputs must have a common-mode
voltage of 2.048 V and adhere to the amplitudes as described in
the AD7765 Input Structure section.
An example of a typical circuit to drive the AD7765 for
applications requiring excellent ac and dc performance is shown
in Figure 34. Either the AD8606 or AD8656 can be used to
Best practice is to short the differential amplifier inputs to
ground through the typical input resistors and leave the typical
feedback resistors in place.
06
51
9-
30
2
1
VINA–
2
VOUTA+
RFB
RIN
3
VINA+
4
VOUTA–
RFB
RIN
6
VIN+
AD7764/
AD7765
5
VIN–
U1
10k
4.99k
51
0
10k
C22
2.048V
U2
10k
4.99k
51
0
10k
C12
1.024V
AD8606
AD8655
AD8606
AD8655
ANALOG
INPUT1
1 –0.5dBFS INPUT SIGNAL AS DESCRIBED IN INPUT STRUCTURE SECTION.
2 SET C1 AND C2 AS REQUIRED FOR APPLICATION INPUT BW AND
ANTI-ALIAS REQUIREMENT.
Figure 34. Driving the AD7765 Modulator Inputs Directly from a Single-
Ended Source (On-Board Differential Amplifier Powered Down)
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