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參數資料
| 型號： | AD7805BR |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | DAC |
| 英文描述： | %2B3.3V to %2B5V Quad/Octal 10-Bit DACs |
| 中文描述： | PARALLEL, WORD INPUT LOADING, 1.5 us SETTLING TIME, 10-BIT DAC, PDSO28 |
| 封裝： | SOIC-28 |
| 文件頁數： | 8/28頁 |
| 文件大小： | 300K |
| 代理商： | AD7805BR |
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AD7804/AD7805/AD7808/AD7809
REV. A
–8–
AD7805/AD7809 PIN FUNCTION DESCRIPTIONS
AD7805
Pin No.
AD7809
Pin No.
1, 11, 13,
20, 33
2, 5, 39, 40
41, 42
43
3, 4, 6, 7, 9,
10, 15, 23
24, 26
Mnemonic
NC
Description
No Connect. These pins should be left open circuit.
1
2, 3
4
5–10,
12, 13
19, 20
AGND
V
OUT
B, V
OUT
A
REFOUT
DB9–DB2
Ground reference point for analog circuitry.
Analog output voltages from the DACs.
Reference Output. This is a bandgap reference and is typically 1.23 V.
Data Inputs. DB9 to DB2 are the 8 MSBs of the data word.
DB1, DB0
DB1 and DB0 function as the 2 LSBs of the 10-bit word in 10-bit parallel mode but
have other functions when BYTE loading structure is used.
Analog output voltages from the DACs.
LDAC
Input. When this digital input is taken low, all DAC registers are simultaneously
updated with the contents of the DAC data registers. If
LDAC
is permanently tied low, or is
low during the rising edge of
WR
similar to data inputs, an automatic update will take place.
Ground reference point for digital circuitry.
Digital Power Supply.
Write Input
WR
is an active low logic input which is used in conjunction with
CS
and
the address pins to write data to the relevant registers.
Chip Select. Active low logic input.
Asynchronous
CLR
Input. When this input is taken low, all Main DAC outputs are
cleared either to V
BIAS
or to V
BIAS
/16 volts. All Sub DACs are also cleared and thus the
transfer function of the MAIN DAC will remain centered around the V
BIAS
point.
Analog output voltages from the DACs.
DAC Address Inputs. These digital inputs are used in conjunction with
CS
and
WR
to
determine which DAC channel control register or DAC data register is loaded from the
input register. These address bits are don’t cares when writing to the system control register.
Logic Input. Logic high enables writing to the DAC data registers, a logic low enables
writing to the control registers.
This is an external reference input for the DAC. When this reference is selected for the DAC
in the control register, the analog output from the selected DAC swings around this point.
Compensation Pin. This pin provides an output from the internal V
DD
/2 divider and is
provided for ac bypass purposes only. This pin should be decoupled with 1 nF capacitors
to both AV
DD
and AGND. This pin can be overdriven with an external reference, thus
giving the facility for two external references on the part.
Analog output voltages from the DACs.
Analog Power Supply.
Active low input used to put the part into low power mode reducing current consump-
tion to 1
μ
A.
8, 12
14
V
OUT
F, V
OUT
E
LDAC
11
14
15
16
16
17
18
DGND
DV
DD
WR
17
18
21
19
CS
CLR
22, 25
27, 29, 30
V
OUT
H, V
OUT
G
A2, A1, A0
21, 22
23
31
MODE
24
32
REFIN
25
34
COMP
26, 27
28
35, 36
28, 37, 38
44
V
OUT
D, V
OUT
C
AV
DD
PD
AD7805 PIN CONFIGURATION
TOP VIEW
(Not to Scale)
28
27
26
25
24
23
22
21
20
19
18
17
16
15
1
2
3
4
5
6
7
8
9
10
11
12
13
14
AD7805
DGND
DB2
DB3
LDAC
DB4
DB5
DB6
AGND
V
OUT
B
V
OUT
A
REFOUT
DB7
DB8
DB9
DV
DD
WR
CS
CLR
DB1
DB0
A1
AV
DD
V
OUT
C
V
OUT
D
COMP
A0
MODE
REFIN
AD7809 PIN CONFIGURATION
44 43 42 41 40 39 38 37 36 35 34
1
2
3
4
5
6
7
8
9
10
11
12 13 14 15 16 17 18 19 20 21 22
33
32
31
30
29
28
27
26
25
24
23
PIN 1
TOP VIEW
(Not to Scale)
NC = NO CONNECT
NC
REFIN
MODE
A0
A1
AV
DD
A2
DB0
V
OUT
G
DB1
DB2
NC
AGND
DB9
DB8
AGND
DB7
DB6
V
OUT
F
DB5
DB4
NC
P
R
V
O
A
V
O
B
A
A
A
D
V
O
E
N
L
D
D
D
W
C
N
C
V
O
H
D
A
D
V
O
C
V
O
D
C
AD7809
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