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參數(shù)資料
| 型號： | AD7641BCPZ |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | ADC |
| 英文描述： | 18-Bit 250/670 kSPS PulSAR Bipolar Programmable Inputs ADC |
| 中文描述： | 1-CH 18-BIT SUCCESSIVE APPROXIMATION ADC, SERIAL/PARALLEL ACCESS, QCC48 |
| 封裝： | 7 X 7 MM, LEAD FREE, MO-220VKKD-2, LFCSP-48 |
| 文件頁數(shù)： | 9/14頁 |
| 文件大小： | 192K |
| 代理商： | AD7641BCPZ |
Preliminary Technical Data
AD7631/AD7634
PIN CONFIGURATION AND FUNCTION DESCRIPTIONS
Rev. PrC | Page 9 of 14
36
35
34
33
32
31
30
29
28
27
26
25
13 14 15 16 17 18 19 20 21 22 23 24
D
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
TOP VIEW
(Not to Scale)
BIPOLAR
CNVST
PD
RESET
CS
RD
TEN
BUSY
D17/SPPEN
D16/SPPCLK
D15/SPPDATA
D14/HW/SW
AGND
AVDD
MODE0
MODE1
D0/OB/2C
WARP
NC = NO CONNECT
D1/A0
D2/A1
D3
D4DIVSCLK[0]
D5/DIVSCLK[1]
AD7631/AD7634
D
D
D
O
O
D
D
D
D
D
D
P
P
R
T
A
I
A
V
V
I
R
R
IMPULSE
-
Figure 4. Pin Configuration
Table 6. Pin Function Descriptions
Pin
No.
Mnemonic
1, 42
AGND
2, 44
AVDD
3, 4
MODE[0:1]
5
D0/OB/2C
Description
Analog Power Ground Pin.
Input Analog Power Pins. Nominally 5 V.
Data Output Interface Mode Selection.
Interface MODE#
0
1
2
3
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.
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.
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.
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.
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.
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.
Type
1
P
P
DI
DI/O
MODE1
0
0
1
1
MODE0
0
1
0
1
Description
18-bit interface
16-bit interface
8-bit (byte) interface
Serial interface
6
WARP
DI
7
IMPULSE
DI
8
D1/A0
DI/O
9
D2/A1
DI
/
O
10
D3
D0
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