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參數(shù)資料
| 型號： | AM6012 |
| 廠商： | NXP Semiconductors N.V. |
| 英文描述： | 12-Bit multiplying D/A converter |
| 中文描述： | 12位乘法D / A轉(zhuǎn)換器 |
| 文件頁數(shù)： | 7/11頁 |
| 文件大?。?/td> | 107K |
| 代理商： | AM6012 |
Philips Semiconductors Linear Products
Product specification
AM6012
12-Bit multiplying D/A converter
August 31, 1994
782
FREQUENCY MHz
Figure 2.
REFERENCE CONFIGURATION
R
14
R
15
R
IN
C
C
I
REF
Positive reference
Negative reference
V
R+
0V
0V
V
R–
0V
N/C
N/C
0.01
μ
F
0.01
μ
F
V
R+
/R
14
–V
R–
/R
14
(V
R+
/R
14
) + (V
IN
/R
IN
)
2
(V
R+
– R
IN
) / R
143
(V
R+
/R
14
) + (V
IN
/R
IN
)
Lo impedance bipolar reference
V
R+
V
R+
V
R+
V
IN1
N/C
1
Hi impedance bipolar reference
Pulsed reference
4
V
IN
0V
V
IN
No Cap
NOTES:
1.
2.
3.
4.
5.
6.
The compensation capacitor is a function of the impedance seen at the +V
REF
input and must be at least 5pF x R
14(eq)
in k
. For R
14
< 800
no capacitor is necessary.
For negative values of V
IN
, V
R+
/ R
14
must be greater than –V
IN
max / R
IN
so that the amplifier is not turned off.
For positive values of V
IN
, V
R+
must be greater than –V
IN
max so the amplifier is not turned off.
For pulsed operation, V
R+
provides a DC offset and may be set to zero in some cases. The impedance at Pin 14 should be 800
or less.
For optimum settling time, decouple V– with 20
and bypass with 22
μ
F tantalum capacitor.
Reference current and reference resistor — there is a 1-to-4 scale factor between the reference current (I
REF
) and the full-scale output current (IFS).
If V
REF
= +10V and I
FS
= 4mA, the value of the R
14
is:
R
14
4
x
10
V
4
mA
10
k
R
14
R
15
a. Reference Amplifier Biasing
b.
Reference Amplifier
Frequency Response
Minimum Size
Compensation Capacitor
(I
FS
= 4mA, I
REF
= 1.0mA)
R
14(EQ)
(k
)
10
5
2
1
.5
C
C
(pF)
50
25
10
5
0
NOTE:
A 0.01
μ
F capacitor is recommended for fixed
reference operation.
14
15
REFERENCE
AM6012
18
19
FOR ALL INPUT CODES
COMP
0.1
20
(NOTE 5)
I
+ I
= I
I
O
I
O
V–
V+
V–
I
15
I
REF
V
IN
R
IN
R
14
R
15
V
R+
V
R–
22
μ
F TANTALUM
R
15
= R
14
= R
IN
V
IN
C
C
0.1
6
4
2
0
–2
–4
–6
–8
.01
0.1
1.0
10
R
LARGE SIGNAL = 50%
SMALL SIGNAL = 1%
R
14 (EQ)
= 2k
C
C
= 10pF
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