PIN CONFIGURATION
Top View
TQFP
64 63 62 61 60 59 58 57 56 55 54 53 52 51 50 49
+VSA
1
2
3
4
5
6
7
8
9
48 GND
47 GND
46 VREF
45 SEL1
44 SEL2
43 GND
42 GND
41 BTC
+VSA
+VSD
+VSD
+VSD
+VSD
GND
GND
CLK
ADS5421Y
40 PD
CLK 10
GND 11
39 OE
38 GNDRV
37 GNDRV
36 GNDRV
35 VDRV
34 VDRV
33 VDRV
GND 12
GNDRV 13
GNDRV 14
DNC 15
DV 16
17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32
PIN DESCRIPTIONS
PIN
I/O
DESIGNATOR
DESCRIPTION
Analog Supply Voltage
PIN
I/O
DESIGNATOR
DESCRIPTION
1
2
3
4
5
6
7
8
+VSA
+VSA
+VSD
+VSD
+VSD
+VSD
GND
GND
CLK
CLK
GND
GND
GNDRV
GNDRV
DNC
DV
B1
B2
B3
B4
B5
B6
B7
B8
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
VDRV
VDRV
VDRV
GNDRV
GNDRV
GNDRV
OE
Output Driver Supply Voltage
Output Driver Supply Voltage
Output Driver Supply Voltage
Ground
Analog Supply Voltage
Digital Supply Voltage
Digital Supply Voltage
Digital Supply Voltage
Digital Supply Voltage
Ground
Ground
Clock Input
Complementary Clock Input
Ground
Ground
Ground
Ground
Output Enable: HI = High Impedance
Power Down: HI = Power Down; LO = Normal
HI = Binary Two’s Complement
I
I
PD
BTC
9
I
I
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
GND
GND
SEL2
SEL1
VREF
GND
GND
GND
REFB
CM
REFT
GND
GND
GND
GND
IN
Ground
Ground
Reference Select 2: See Table on Page 5
Reference Select 1: See Table on Page 5
Internal Reference Voltage
Ground
Ground
Ground
Do Not Connect
Data Valid Pulse: HI = Data Valid
Data Bit 1 (D13) (MSB)
Data Bit 2 (D12)
Data Bit 3 (D11)
Data Bit 4 (D10)
Data Bit 5 (D9)
Data Bit 6 (D8)
Data Bit 7 (D7)
Data Bit 8 (D6)
Data Bit 9 (D5)
Data Bit 10 (D4)
Data Bit 11 (D3)
Data Bit 12 (D2)
Data Bit 13 (D1)
Data Bit 14 (D0) (LSB)
No Internal Connection
No Internal Connection
Ground
Ground
O
O
O
O
O
O
O
O
O
O
O
O
O
O
Bottom Reference Voltage Bypass
Common-Mode Voltage (Midscale)
Top Reference Voltage Bypass
Ground
Ground
Ground
Ground
B9
I
I
Complementary Analog Input
Ground
Analog Input
B10
B11
B12
B13
B14
NC
GND
IN
GND
REFBY
GND
+VSA
+VSA
Ground
Reference Bypass
Ground
Analog Supply Voltage
Analog Supply Voltage
NC
ADS5421
4
SBAS237D
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