AD7763 Analog Devices, AD7763 Datasheet - Page 8

• Manufacturer Part Number: AD7763
• Description: 24-Bit, 625 kSPS, 109 dB Sigma-Delta ADC with On-Chip Buffers, Serial Interface
• Manufacturer: Analog Devices

Specifications of AD7763

• Resolution (bits): 24bit
• # Chan: 1
• Sample Rate: 40MSPS
• Interface: I2S,Ser
• Analog Input Type: Diff-Bip
• Ain Range: 4 V p-p,6.5 V p-p
• Adc Architecture: Sigma-Delta
• Pkg Type: QFP

AD7763
PIN CONFIGURATION AND FUNCTION DESCRIPTIONS
Table 5. Pin Function Descriptions
Pin No.
6, 33
4, 14, 15, 27
24
12
7, 34
5, 13, 16, 18, 28
23, 29, 31, 32
11
9
41
44, 63
1, 35, 42, 43, 53, 57, 59,
19
20
21
22
25
26
10
62, 64
Mnemonic
AV
AV
AV
AV
AGND1
AGND2
AGND3
AGND4
REFGND
DV
V
DGND
V
V
V
V
V
V
V
DRIVE
IN
IN
OUT
OUT
IN
IN
REF+
DD1
DD2
DD3
DD4
A+
A−
+
−
DD
A−
A+
MCLKGND
DECAPA
REFGND
NOTES
1. THE PADDLE MUST BE CONNECTED DIRECTLY TO THE GROUND PLANE OF
AGND2
AGND1
AGND4
AGND2
AGND2
AV
AV
AV
AV
AV
DGND
MCLK
V
THE PCB USING MULTIPLE VIAS.
REF+
DD2
DD1
DD4
DD2
DD2
Description
Power Supply for Modulator, 2.5 V. These pins should be decoupled to AGND1 with 100 nF and
10 μF capacitors on each pin.
Power Supply, 5 V. 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 an 8.2 nH inductor.
Power Supply for Differential Amplifier, 3.3 V to 5 V. This pin should be decoupled to AGND3
with a 100 nF capacitor.
Power Supply for Reference Buffer, 3.3 V to 5 V. This pin should be decoupled to AGND4
with a 10 nF capacitor in series with a 10 Ω resistor.
Power Supply Ground for Analog Circuitry Powered by AV
Power Supply Ground for Analog Circuitry Powered by AV
Power Supply Ground for Analog Circuitry Powered by AV
Power Supply Ground for Analog Circuitry Powered by AV
Reference Ground. Ground connection for the reference voltage.
Power Supply for Digital Circuitry and FIR Filter, 2.5 V. This pin should be decoupled to DGND
with a 100 nF capacitor.
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. These pins must be connected together and
tied to the same supply. Each pin should also be decoupled to DGND with a 100 nF capacitor.
Ground Reference for Digital Circuitry.
Positive Input to Differential Amplifier.
Negative Input to Differential Amplifier.
Negative Output from Differential Amplifier.
Positive Output from Differential Amplifier.
Positive Input to the Modulator.
Negative Input to the Modulator.
Reference Input. The input range of this pin is determined by the reference buffer
supply voltage (AV
10
11
12
13
14
15
16
1
2
3
4
5
6
7
8
9
64 63 62 61 60 59 58 57 56 55 54 53 52 51 50 49
17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32
PIN 1
Figure 5. Pin Configuration
Rev. A | Page 8 of 32
DD4
). See the Reference Voltage Filtering section for more details.
(Not to Scale)
AD7763
TOP VIEW
48
47
46
45
44
43
42
41
40
39
38
37
36
35
34
33
ADR0
ADR1
ADR2
SH0
V
DGND
DGND
DV
SH1
SH2
DRDY
RESET
SYNC
DGND
AGND1
AV
DRIVE
DD
DD1
DD1
DD2
DD3
DD4
.
.
.
.