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AD7674 Datasheet(PDF) 8 Page - Analog Devices

Part No. AD7674
Description  18-Bit, 2.5 LSB INL, 800 kSPS SAR ADC
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Manufacturer  AD [Analog Devices]
Direct Link  http://www.analog.com
Logo AD - Analog Devices

AD7674 Datasheet(HTML) 8 Page - Analog Devices

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AD7674
Rev. 0 | Page 8 of 28
PIN CONFIGURATION AND FUNCTION DESCRIPTIONS
36
35
34
33
32
31
30
29
28
27
26
25
13 14 15 16 17 18 19 20 21 22 23 24
1
2
3
4
5
6
7
8
9
10
11
12
48 47 46 45 44
39 38 37
43 42 41 40
PIN 1
IDENTIFIER
TOP VIEW
(Not to Scale)
AGND
CNVST
PD
RESET
CS
RD
DGND
AGND
AVDD
MODE0
MODE1
D0/OB/2C
WARP
IMPULSE
NC = NO CONNECT
D1/A0
D2/A1
D3
D4/DIVSCLK[0]
BUSY
D17
D16
D15
AD7674
D5/DIVSCLK[1]
D14
03083–0–004
Figure 4. 48-Lead LQFP and 48-Lead LFCSP (ST-48 and CP-48)
Table 6. Pin Function Descriptions
Pin No.
Mnemonic
Type1
Description
1, 44
AGND
P
Analog Power Ground Pin.
2, 47
AVDD
P
Input Analog Power Pins. Nominally 5 V.
3
MODE0
DI
Data Output Interface Mode Selection.
4
MODE1
DI
Data Output Interface Mode Selection:
Interface MODE #
MODE1
MODE0
Description
0
0
0
18-Bit Interface
1
0
1
16-Bit Interface
2
1
0
Byte Interface
3
1
1
Serial Interface
5
D0/OB/2C
DI/O
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.
6
WARP
DI
Conversion Mode Selection. When this input is HIGH and the IMPULSE pin is LOW, WARP selects the
fastest mode, the maximum throughput is achievable, and a minimum conversion rate must be applied
in order to guarantee full specified accuracy. When LOW, full accuracy is maintained independent of the
minimum conversion rate.
7
IMPULSE
DI
Conversion Mode Selection. When this input is HIGH and the WARP pin is LOW, IMPULSE selects a
reduced power mode. In this mode, the power dissipation is approximately proportional to the
sampling rate. When WARP and IMPULSE pins are LOW, the NORMAL mode is selected.
8
D1/A0
DI/O
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.
9
D2/A1
DI/O
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.
10
D3
DO
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.
11, 12
D[4:5]or
DIVSCLK[0:
1]
DI/O
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), when 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.


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