AD7762 Analog Devices, AD7762 Datasheet - Page 7

• Manufacturer Part Number: AD7762
• Description: Parallel Interface, 625 kSPS, 24-Bit Sigma-Delta A/D Converter
• Manufacturer: Analog Devices

Specifications of AD7762

• Resolution (bits): 24bit
• # Chan: 1
• Sample Rate: 40MSPS
• Interface: Par
• Analog Input Type: Diff-Uni
• Ain Range: (1.6Vref) p-p,4 V p-p,6.5 V p-p
• Adc Architecture: Sigma-Delta
• Pkg Type: QFP

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, 62, 64
19
20
21
22
25
26
10
8
Mnemonic
AV
AV
AV
AV
AGND1
AGND2
AGND3
AGND4
REFGND
DV
V
DGND
V
V
V
V
V
V
V
DECAPA
DRIVE
IN
IN
OUT
OUT
IN
IN
REF+
DD1
DD2
DD3
DD4
A+
A−
+
−
DD
A−
A+
Description
2.5 V Power Supply for Modulator. These pins should be decoupled to AGND1 with 100 nF and 10 μF
capacitors on each pin.
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.
3.3 V to 5 V Power Supply for Differential Amplifier. These pins should be decoupled to AGND3 with a
100 nF capacitor.
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.
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.
2.5 V Power Supply for Digital Circuitry and FIR Filter. 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. 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.
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
Decoupling Pin. A 100 nF capacitor must be inserted between this pin and AGND1.
MCLKGND
DECAPA
REFGND
AGND2
AGND1
AGND4
AGND2
AGND2
DD4
AV
AV
AV
AV
AV
DGND
MCLK
V
REF+
). See the Reference Voltage Filtering section for more details.
DD2
DD1
DD4
DD2
DD2
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
Figure 4. 64-Lead TQFP Pin Configuration
PIN 1
Rev. 0 | Page 7 of 28
(Not to Scale)
AD7762
TOP VIEW
DD1
DD2
DD3
DD4
48
47
46
45
44
43
42
41
40
39
38
37
36
35
34
33
.
.
.
.
DB12
DB13
DB14
DB15
V
DGND
DGND
DV
CS
RD/WR
DRDY
RESET
SYNC
DGND
AGND1
AV
DRIVE
DD
DD1
AD7762