EVAL-AD7678CB Analog Devices Inc, EVAL-AD7678CB Datasheet - Page 8

• Manufacturer Part Number: EVAL-AD7678CB
• Description: BOARD EVALUATION FOR AD7678
• Manufacturer: Analog Devices Inc
• Series: PulSAR®r

Specifications of EVAL-AD7678CB

• Number Of Adc's: 1
• Number Of Bits: 18
• Sampling Rate (per Second): 100k
• Data Interface: Serial, Parallel
• Inputs Per Adc: 1 Differential
• Input Range: ±VREF
• Power (typ) @ Conditions: 31mW @ 100kSPS
• Voltage Supply Source: Analog and Digital
• Operating Temperature: -40°C ~ 85°C
• Utilized Ic / Part: AD7678
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

AD7678
PIN CONFIGURATION AND FUNCTION DESCRIPTIONS
Table 6. Pin Function Descriptions
Pin No.
1, 44
2, 47
3
4
5
6, 7,
40–42,
45
8
9
10
11, 12
Mnemonic
AGND
AVDD
MODE0
MODE1
D0/OB/2C
NC
D1/A0
D2/A1
D3
D[4:5]or
DIVSCLK[0:1]
Type
P
P
DI
DI
DI/O
DI/O
DI/O
DO
DI/O
1
Figure 4. 48-Lead LQFP and 48-Lead LFCSP (ST-48 and CP-48) Pin Configuration
Description
Analog Power Ground Pin.
Input Analog Power Pins. Nominally 5 V.
Data Output Interface Mode Selection.
Data Output Interface Mode Selection:
When MODE = 0 (18-bit interface mode), this pin is Bit 0 of the parallel port data output bus and the
data coding is straight binary. In all other modes, this pin allows choice of straight binary/binary twos
complement. When OB/2C is HIGH, the digital output is straight binary; when LOW, the MSB is
inverted, resulting in a twos complement output from its internal shift register.
No Connect.
When MODE = 0 (18-bit interface mode), this pin is Bit 1 of the parallel port data output bus. In all
other modes, this input pin controls the form in which data is output, as shown in Table 7.
When MODE = 0 or 1 (18-bit or 16-bit interface mode), this pin is Bit 2 of the parallel port data output
bus. In all other modes, this input pin controls the form in which data is output, as shown in Table 7.
In all modes except MODE = 3, this output is used as Bit 3 of the parallel port data output bus. This pin
is always an output, regardless of the interface mode.
In all modes except MODE = 3, these pins are Bit 4 and Bit 5 of the parallel port data output bus.
When MODE = 3 (serial mode), EXT/INT is LOW, and RDC/SDIN is LOW (serial master read after
convert), these inputs, part of the serial port, are used to slow down, if desired, the internal serial clock
that clocks the data output. In other serial modes, these pins are not used.
Interface MODE #
0
1
2
3
NOTES
1. NC = NO CONNECT.
2. THE EXPOSED PAD IS INTERNALLY CONNECTED TO AGND. THIS
D4/DIVSCLK[0]
D5/DIVSCLK[1]
CONNECTION IS NOT REQUIRED TO MEET THE ELECTRICAL
PERFORMANCES; HOWEVER, FOR INCREASED RELIABILITY OF
THE SOLDER JOINTS, IT IS RECOMMENDED THAT THE PAD BE
SOLDERED TO THE ANALOG GROUND OF THE SYSTEM.
D0/OB/2C
MODE0
MODE1
AGND
D1/A0
D2/A1
AVDD
NC
NC
D3
10
11
12
1
2
3
4
5
6
7
8
9
48 47 46 45 44
13 14 15 16 17 18 19 20 21 22 23 24
MODE1
0
0
1
1
PIN 1
IDENTIFIER
Rev. A | Page 8 of 28
(Not to Scale)
AD7678
TOP VIEW
43 42 41 40
MODE0
0
1
0
1
39 38 37
Description
18-Bit Interface
16-Bit Interface
Byte Interface
Serial Interface
36
35
34
33
32
31
30
29
28
27
26
25
AGND
CNVST
PD
RESET
CS
RD
DGND
BUSY
D17
D16
D15
D14