Datasheet
AD9258
Rev. A | Page 13 of 44
PIN CONFIGURATIONS AND FUNCTION DESCRIPTIONS
PIN 1
INDICATOR
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
D10B
D11B
DRVDD
D12B
D13B (MSB)
ORB
DCOB
DCOA
NC
NC
D0A (LSB)
DRVDD
D1A
D2A
D3A
D4A
64
63
62
61
60
59
58
57
56
55
54
53
52
51
50
49
AVDD
AVDD
VIN+B
VIN–B
AVDD
AVDD
RBIAS
VCM
SENSE
VREF
AVDD
AVDD
VIN–A
VIN+A
AVDD
AVDD
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
CLK+
CLK–
SYNC
NC
NC
D0B (LSB)
D1B
D2B
D3B
DRVDD
D4B
D5B
D6B
D7B
D8B
D9B
PDWN
OEB
CSB
SCLK/DFS
SDIO/DCS
ORA
D13A (MSB)
D12A
D11A
D10A
D9A
DRVDD
D8A
D7A
D6A
D5A
48
47
46
45
44
43
42
41
40
39
38
37
36
35
34
33
AD9258
PARALLEL CMOS
TOP VIEW
(Not to Scale)
08124-005
NOTES
1. NC = NO CONNECT.
2. THE EXPOSED THERMAL PAD ON THE BOTTOM OF THE PACKAGE
PROVIDES THE ANALOG GROUND FOR THE PART. THIS EXPOSED
PAD MUST BE CONNECTED TO GROUND FOR PROPER OPERATION.
Figure 6. LFCSP Parallel CMOS Pin Configuration (Top View)
Table 8. Pin Function Descriptions (Parallel CMOS Mode)
Pin No. Mnemonic Type Description
ADC Power Supplies
10, 19, 28, 37 DRVDD Supply Digital Output Driver Supply (1.8 V Nominal).
49, 50, 53, 54, 59,
60, 63, 64
AVDD Supply Analog Power Supply (1.8 V Nominal).
4, 5, 25, 26 NC Do Not Connect.
0
AGND,
Exposed Pad
Ground
The exposed thermal pad on the bottom of the package provides the analog
ground for the part. This exposed pad must be connected to ground for proper
operation.
ADC Analog
51 VIN+A Input Differential Analog Input Pin (+) for Channel A.
52 VIN−A Input Differential Analog Input Pin (−) for Channel A.
62 VIN+B Input Differential Analog Input Pin (+) for Channel B.
61 VIN−B Input Differential Analog Input Pin (−) for Channel B.
55 VREF Input/Output Voltage Reference Input/Output.
56 SENSE Input Voltage Reference Mode Select. See Table 11 for details.
58 RBIAS Input/Output External Reference Bias Resistor.
57 VCM Output Common-Mode Level Bias Output for Analog Inputs.
1 CLK+ Input ADC Clock Input—True.
2 CLK− Input ADC Clock Input—Complement.
Digital Input
3 SYNC Input Digital Synchronization Pin. Slave mode only.
Digital Outputs
27 D0A (LSB) Output Channel A CMOS Output Data.
29 D1A Output Channel A CMOS Output Data.
30 D2A Output Channel A CMOS Output Data.
31 D3A Output Channel A CMOS Output Data.