參數資料
型號: AD7366BRUZ-5
廠商: Analog Devices Inc
文件頁數: 10/28頁
文件大?。?/td> 0K
描述: IC ADC 12BIT DUAL 500KSPS 24-TSS
設計資源: Driving the AD7366/7 Bipolar SAR ADC in Low-Distortion DC-Coupled Appls (CN0042)
標準包裝: 62
系列: iCMOS®
位數: 12
采樣率(每秒): 500k
數據接口: DSP,MICROWIRE?,QSPI?,串行,SPI?
轉換器數目: 2
功率耗散(最大): 88.8mW
電壓電源: 模擬和數字,雙 ±
工作溫度: -40°C ~ 85°C
安裝類型: 表面貼裝
封裝/外殼: 24-TSSOP(0.173",4.40mm 寬)
供應商設備封裝: 24-TSSOP
包裝: 管件
輸入數目和類型: 4 個單端,單極;4 個單端,雙極
配用: EVAL-AD7366CBZ-ND - BOARD EVALUATION FOR AD7366
AD7366-5/AD7367-5
Rev. A | Page 18 of 28
Unlike other bipolar ADCs, the AD7366-5/AD7367-5 do not
have a resistive analog input structure. On the AD7366-5/
AD7366-5, the bipolar analog signal is sampled directly onto
the sampling capacitor. This gives the devices high analog input
impedance. The analog input impedance can be calculated from
the following formula:
Z = 1/(fS × CS)
where:
fS is the sampling frequency.
CS is the sampling capacitor value.
CS depends on the analog input range chosen (see the Analog
Inputs section). When operating at 500 kSPS, the analog input
impedance is typically 260 kΩ for the ±10 V range. As the
sampling frequency is reduced, the analog input impedance
further increases. As the analog input impedance increases, the
current required to drive the analog input therefore, decreases
(see Figure 7 for more information).
TYPICAL CONNECTION DIAGRAM
Figure 20 shows a typical connection diagram for the AD7366-5/
AD7367-5. In this configuration, the AGND pin is connected
to the analog ground plane of the system, and the DGND pin
is connected to the digital ground plane of the system. The
analog inputs on the AD7366-5/AD7367-5 accept bipolar
single-ended signals. The AD7366-5/AD7367-5 can operate
with either an internal or an external reference. In Figure 20, the
AD7366-5/AD7367-5 is configured to operate with the internal
2.5 V reference. A 680 nF decoupling capacitor is required when
operating with the internal reference.
The AVCC and DVCC pins are connected to a 5 V supply voltage.
The VDD and VSS are the dual supplies for the high voltage analog
input structures. The voltage on these pins must be greater than
or equal to ±5 V (see Table 7 for more information). The VDRIVE pin
is connected to the supply voltage of the microprocessor. The
voltage applied to the VDRIVE input controls the voltage of the
serial interface. VDRIVE can be set to 3 V or 5 V.
AD7366-5/
AD7367-5
M
ICRO
CO
NT
RO
L
E
R
/
M
IC
RO
P
RO
CE
S
O
R
CS
VDRIVE
10F
0.1F
++
+3V OR +5V SUPPLY
+5V TO +16.5V
SUPPLY
+5V SUPPLY
0.1F
+
–16.5V TO –5V
SUPPLY
DVCC AVCC
BUSY
CNVST
REFSEL
VDRIVE
DCAPA
DCAPB
ADDR
ANALOG INPUTS ±10V,
±5V, AND 0V TO +10V
680nF
SCLK
DOUTA
DOUTB
RANGE1
RANGE0
VB1
VB2
VA1
VDD
VA2
10F
0.1F
AGND
VSS
+
0.1F
+
10F
+
SERIAL
INTERFACE
+
10F
+
0.1F
+
DGND
06
84
2-
0
22
Figure 20. Typical Connection Diagram for ±10 V Range Using Internal Reference
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