AD7762_15 Datasheet, PDF (19/29 Pages) Analog Devices – 625 kSPS, 24-Bit, 109 dB Sigma-Delta ADC With On-Chip Buffer

AD7762
Data Sheet
DECOUPLING AND LAYOUT RECOMMENDATIONS
Due to the high performance nature of the AD7762, correct decoupling and layout techniques are required to obtain the performance as
stated within this datasheet. Figure 29 shows a simplified connection diagram for the AD7762.
INA+
INA–
OUTA–
OUTA+
C7
100nF
C64
33pF
VIN+
VIN–
VREF
R19
160k
19
20 ^VINA+
21 ^VINA–
22 ^VOUTA–
V_OUTA+
8
30 ^DECAPA
DECAPB
25
26 ^VIN+
V_IN–
10
9 ^VREF+
REFGND
17
R_BIAS
1
35 ^DGND
42 ^DGND
43 ^DGND
53 ^DGND
62 ^DGND
64 ^DGND
DGND
AD7762BSV
U2
61
DB0 ₆₀
DB1 ₅₉
DB2 ₅₈
DB3 ₅₇
DB4 ₅₆
DB5 ₅₅
DB6 ₅₄
DB7 ₅₂
DB8 ₅₁
DB9 ₅₀
DB10 ₄₉
DB11 ₄₈
DB12 ₄₇
DB13 ₄₆
DB14 ₄₅
DB15
40
CS ₃₉
RD/WR
37
RESET ₃₆
SYNC ₃₈
DRDY
3
MCLK ₂
MCLKGND
DB (0:15)
DB0
DB1
DB2
DB3
DB4
DB5
DB6
DB7
DB8
DB9
DB10
DB11
DB12
DB13
DB14
DB15
CS
RD/WR
RESET
SYNC
DRDY
MCLK
AV_DD2
L1
PIN 4
(RHS)
L3
PIN 15
(VBIAS)
L2
PIN 14
(LHS)
C48
100nF
C50
100nF
C62
100nF
AV_DD4
PIN 12
(VBUF)
L4
L9 PIN 27
R38
10
C59
10nF
AV_DD1
L5
L11
PIN 5
(VMOD1)
PIN 33
(VMOD2)
C52
100nF
C53
100nF
AV_DD3
V_DRIVE
L6
PIN 24
(VDIF1)
L7
PIN 44
(VDRV1)
L12
PIN 63
(VDRV2)
C54
100nF
C56
100nF
C57
100nF
DV_DD
L8
PIN 41
(DVDD)
C58
100nF
Figure 29. Simplified Connection Diagram
Rev. A | Page 18 of 28