AD7641BCPZ 데이터 시트보기 (PDF) - Analog Devices
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AD7641BCPZ Datasheet PDF : 14 Pages
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Preliminary Technical Data
PIN CONFIGURATION AND FUNCTION DESCRIPTIONS
AD7631/AD7634
48 47 46 45 44 43 42 41 40 39 38 37
AGND 1
AVDD 2
MODE0 3
MODE1 4
D0/OB/2C 5
WARP 6
IMPULSE 7
D1/A0 8
D2/A1 9
D3 10
D4DIVSCLK[0] 11
D5/DIVSCLK[1] 12
PIN 1
IDENTIFIER
AD7631/AD7634
TOP VIEW
(Not to Scale)
36 BIPOLAR
35 CNVST
34 PD
33 RESET
32 CS
31 RD
30 TEN
29 BUSY
28 D17/SPPEN
27 D16/SPPCLK
26 D15/SPPDATA
25 D14/HW/SW
NC = NO CONNECT
13 14 15 16 17 18 19 20 21 22 23 24
Figure 4. Pin Configuration
Table 6. Pin Function Descriptions
Pin
No. Mnemonic
Type1 Description
1, 42 AGND
P
Analog Power Ground Pin.
2, 44 AVDD
P
Input Analog Power Pins. Nominally 5 V.
3, 4 MODE[0:1]
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
8-bit (byte) interface
3
1
1
Serial interface
5
D0/OB/2C
DI/O When MODE[1:0] = 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 the choice of straight
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
AD7634: Conversion Mode Selection. When WARP = high and IMPULSE = low, this selects warp mode.
In this mode, the maximum throughput is achievable, and a minimum conversion rate must be applied
to guarantee full specified accuracy.
When WARP = low and IMPULSE = low, this selects normal mode where full accuracy is maintained
independent of the minimum conversion rate.
AD7631: Connect to DGND.
7
IMPULSE
DI
AD7634: Conversion Mode Selection. When IMPULSE = high and WARP = low, this input selects impulse
mode, a reduced power mode. In this mode, the power dissipation is approximately scaled
proportional to the sampling rate.
AD7631: Connect to DGND.
8
D1/A0
DI/O When MODE[1:0] = 0, 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[1:0] = 0, this pin is Bit 2 of the parallel port data output bus.
When MODE[1:0] = 1 or 2, this input pin controls the form in which data is output as shown in Table 7.
10
D3
D0 When MODE[1:0] = 0, 1, or 2, 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.
Rev. PrC | Page 9 of 14
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