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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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Maker  AD [Analog Devices]
Homepage  http://www.analog.com
Logo AD - Analog Devices

AD7674 Datasheet(HTML) 8 Page - Analog Devices

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AD7674
Rev. A | Page 8 of 28
PIN CONFIGURATION AND FUNCTION DESCRIPTIONS
1
2
3
4
5
6
7
8
9
10
11
12
AGND
AVDD
MODE0
MODE1
D0/OB/2C
WARP
IMPULSE
D1/A0
D2/A1
D3
D4/DIVSCLK[0]
D5/DIVSCLK[1]
NOTES
1. NC = NO CONNECT.
2. THE EXPOSED PAD IS INTERNALLY CONNECTED TO AGND. THIS 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.
CNVST
PD
RESET
CS
RD
DGND
BUSY
D17
D16
D15
D14
35
AGND
36
34
33
32
31
30
29
28
27
26
25
AD7674
TOP VIEW
(Not to Scale)
PIN 1
INDICATOR
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.


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