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AD7762 Datenblatt(PDF) 7 Page - Analog Devices

Teilenummer AD7762
Bauteilbeschribung  625 kSPS, 24-Bit, 109 dB ADC With On-Chip Buffer
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Direct Link  http://www.analog.com
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AD7762 Datenblatt(HTML) 7 Page - Analog Devices

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AD7762
Rev. 0 | Page 7 of 28
PIN CONFIGURATION AND FUNCTION DESCRIPTIONS
64 63 62
61
60 59 58
57 56 55 54 53 52 51 50 49
47
DB13
46
DB14
45
DB15
42
DGND
43
DGND
44
VDRIVE
48
DB12
41
DVDD
40
CS
39
RD/WR
37
RESET
36
SYNC
35
DGND
34
AGND1
33
AVDD1
38
DRDY
2
MCLKGND
3
MCLK
4
AVDD2
7
AGND1
6
AVDD1
5
AGND2
1
DGND
8
DECAPA
9
REFGND
10
VREF+
12
AVDD4
13
AGND2
14
AVDD2
15
AVDD2
16
AGND2
11
AGND4
PIN 1
17 18
19
20 21 22 23 24 25 26
27 28 29 30 31 32
AD7762
TOP VIEW
(Not to Scale)
Figure 4. 64-Lead TQFP Pin Configuration
Table 5. Pin Function Descriptions
Pin No.
Mnemonic
Description
6, 33
AVDD1
2.5 V Power Supply for Modulator. These pins should be decoupled to AGND1 with 100 nF and 10 μF
capacitors on each pin.
4, 14, 15, 27
AVDD2
5 V Power Supply. These pins should be decoupled to AGND2 with 100 nF capacitors on each of Pin 4,
Pin 14, and Pin 15. Pin 27 should be connected to Pin 14 via a 15 nH inductor.
24
AVDD3
3.3 V to 5 V Power Supply for Differential Amplifier. These pins should be decoupled to AGND3 with a
100 nF capacitor.
12
AVDD4
3.3 V to 5 V Power Supply for Reference Buffer. This pin should be decoupled to AGND4 with a
10 nF capacitor in series with a 10 Ω resistor.
7, 34
AGND1
Power Supply Ground for Analog Circuitry Powered by AVDD1.
5, 13, 16, 18, 28
AGND2
Power Supply Ground for Analog Circuitry Powered by AVDD2.
23, 29, 31, 32
AGND3
Power Supply Ground for Analog Circuitry Powered by AVDD3.
11
AGND4
Power Supply Ground for Analog Circuitry Powered by AVDD4.
9
REFGND
Reference Ground. Ground connection for the reference voltage.
41
DVDD
2.5 V Power Supply for Digital Circuitry and FIR Filter. This pin should be decoupled to DGND with a
100 nF capacitor.
44, 63
VDRIVE
Logic Power Supply Input, 1.8 V to 2.5 V. The voltage supplied at these pins determines the operating
voltage of the logic interface. Both these pins must be connected together and tied to the same supply.
Each pin should also be decoupled to DGND with a100 nF capacitor.
DGND
Ground Reference for Digital Circuitry.
1, 35, 42, 43,
53, 62, 64
19
VINA+
Positive Input to Differential Amplifier.
20
VINA−
Negative Input to Differential Amplifier.
21
VOUTA−
Negative Output from Differential Amplifier.
22
VOUTA+
Positive Output from Differential Amplifier.
25
VIN+
Positive Input to the Modulator.
26
VIN
Negative Input to the Modulator.
10
VREF+
Reference Input. The input range of this pin is determined by the reference buffer supply voltage
(AVDD4). See the Reference Voltage Filtering section for more details.
8
DECAPA
Decoupling Pin. A 100 nF capacitor must be inserted between this pin and AGND1.


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